1 //===- PPCRegisterInfo.cpp - PowerPC Register Information -------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file contains the PowerPC implementation of the TargetRegisterInfo
13 //===----------------------------------------------------------------------===//
15 #define DEBUG_TYPE "reginfo"
17 #include "PPCInstrBuilder.h"
18 #include "PPCMachineFunctionInfo.h"
19 #include "PPCRegisterInfo.h"
20 #include "PPCFrameInfo.h"
21 #include "PPCSubtarget.h"
22 #include "llvm/CallingConv.h"
23 #include "llvm/Constants.h"
24 #include "llvm/Function.h"
25 #include "llvm/Type.h"
26 #include "llvm/CodeGen/ValueTypes.h"
27 #include "llvm/CodeGen/MachineInstrBuilder.h"
28 #include "llvm/CodeGen/MachineModuleInfo.h"
29 #include "llvm/CodeGen/MachineFunction.h"
30 #include "llvm/CodeGen/MachineFrameInfo.h"
31 #include "llvm/CodeGen/MachineLocation.h"
32 #include "llvm/CodeGen/MachineRegisterInfo.h"
33 #include "llvm/CodeGen/RegisterScavenging.h"
34 #include "llvm/Target/TargetFrameInfo.h"
35 #include "llvm/Target/TargetInstrInfo.h"
36 #include "llvm/Target/TargetMachine.h"
37 #include "llvm/Target/TargetOptions.h"
38 #include "llvm/Support/CommandLine.h"
39 #include "llvm/Support/Debug.h"
40 #include "llvm/Support/ErrorHandling.h"
41 #include "llvm/Support/MathExtras.h"
42 #include "llvm/Support/raw_ostream.h"
43 #include "llvm/ADT/BitVector.h"
44 #include "llvm/ADT/STLExtras.h"
47 // FIXME This disables some code that aligns the stack to a boundary
48 // bigger than the default (16 bytes on Darwin) when there is a stack local
49 // of greater alignment. This does not currently work, because the delta
50 // between old and new stack pointers is added to offsets that reference
51 // incoming parameters after the prolog is generated, and the code that
52 // does that doesn't handle a variable delta. You don't want to do that
53 // anyway; a better approach is to reserve another register that retains
54 // to the incoming stack pointer, and reference parameters relative to that.
57 // FIXME (64-bit): Eventually enable by default.
59 cl::opt<bool> EnablePPC32RS("enable-ppc32-regscavenger",
61 cl::desc("Enable PPC32 register scavenger"),
63 cl::opt<bool> EnablePPC64RS("enable-ppc64-regscavenger",
65 cl::desc("Enable PPC64 register scavenger"),
71 #define EnableRegisterScavenging \
72 ((EnablePPC32RS && !Subtarget.isPPC64()) || \
73 (EnablePPC64RS && Subtarget.isPPC64()))
75 // FIXME (64-bit): Should be inlined.
77 PPCRegisterInfo::requiresRegisterScavenging(const MachineFunction &) const {
78 return EnableRegisterScavenging;
81 /// getRegisterNumbering - Given the enum value for some register, e.g.
82 /// PPC::F14, return the number that it corresponds to (e.g. 14).
83 unsigned PPCRegisterInfo::getRegisterNumbering(unsigned RegEnum) {
87 case R0 : case X0 : case F0 : case V0 : case CR0: case CR0LT: return 0;
88 case R1 : case X1 : case F1 : case V1 : case CR1: case CR0GT: return 1;
89 case R2 : case X2 : case F2 : case V2 : case CR2: case CR0EQ: return 2;
90 case R3 : case X3 : case F3 : case V3 : case CR3: case CR0UN: return 3;
91 case R4 : case X4 : case F4 : case V4 : case CR4: case CR1LT: return 4;
92 case R5 : case X5 : case F5 : case V5 : case CR5: case CR1GT: return 5;
93 case R6 : case X6 : case F6 : case V6 : case CR6: case CR1EQ: return 6;
94 case R7 : case X7 : case F7 : case V7 : case CR7: case CR1UN: return 7;
95 case R8 : case X8 : case F8 : case V8 : case CR2LT: return 8;
96 case R9 : case X9 : case F9 : case V9 : case CR2GT: return 9;
97 case R10: case X10: case F10: case V10: case CR2EQ: return 10;
98 case R11: case X11: case F11: case V11: case CR2UN: return 11;
99 case R12: case X12: case F12: case V12: case CR3LT: return 12;
100 case R13: case X13: case F13: case V13: case CR3GT: return 13;
101 case R14: case X14: case F14: case V14: case CR3EQ: return 14;
102 case R15: case X15: case F15: case V15: case CR3UN: return 15;
103 case R16: case X16: case F16: case V16: case CR4LT: return 16;
104 case R17: case X17: case F17: case V17: case CR4GT: return 17;
105 case R18: case X18: case F18: case V18: case CR4EQ: return 18;
106 case R19: case X19: case F19: case V19: case CR4UN: return 19;
107 case R20: case X20: case F20: case V20: case CR5LT: return 20;
108 case R21: case X21: case F21: case V21: case CR5GT: return 21;
109 case R22: case X22: case F22: case V22: case CR5EQ: return 22;
110 case R23: case X23: case F23: case V23: case CR5UN: return 23;
111 case R24: case X24: case F24: case V24: case CR6LT: return 24;
112 case R25: case X25: case F25: case V25: case CR6GT: return 25;
113 case R26: case X26: case F26: case V26: case CR6EQ: return 26;
114 case R27: case X27: case F27: case V27: case CR6UN: return 27;
115 case R28: case X28: case F28: case V28: case CR7LT: return 28;
116 case R29: case X29: case F29: case V29: case CR7GT: return 29;
117 case R30: case X30: case F30: case V30: case CR7EQ: return 30;
118 case R31: case X31: case F31: case V31: case CR7UN: return 31;
120 llvm_unreachable("Unhandled reg in PPCRegisterInfo::getRegisterNumbering!");
124 PPCRegisterInfo::PPCRegisterInfo(const PPCSubtarget &ST,
125 const TargetInstrInfo &tii)
126 : PPCGenRegisterInfo(PPC::ADJCALLSTACKDOWN, PPC::ADJCALLSTACKUP),
127 Subtarget(ST), TII(tii) {
128 ImmToIdxMap[PPC::LD] = PPC::LDX; ImmToIdxMap[PPC::STD] = PPC::STDX;
129 ImmToIdxMap[PPC::LBZ] = PPC::LBZX; ImmToIdxMap[PPC::STB] = PPC::STBX;
130 ImmToIdxMap[PPC::LHZ] = PPC::LHZX; ImmToIdxMap[PPC::LHA] = PPC::LHAX;
131 ImmToIdxMap[PPC::LWZ] = PPC::LWZX; ImmToIdxMap[PPC::LWA] = PPC::LWAX;
132 ImmToIdxMap[PPC::LFS] = PPC::LFSX; ImmToIdxMap[PPC::LFD] = PPC::LFDX;
133 ImmToIdxMap[PPC::STH] = PPC::STHX; ImmToIdxMap[PPC::STW] = PPC::STWX;
134 ImmToIdxMap[PPC::STFS] = PPC::STFSX; ImmToIdxMap[PPC::STFD] = PPC::STFDX;
135 ImmToIdxMap[PPC::ADDI] = PPC::ADD4;
138 ImmToIdxMap[PPC::LHA8] = PPC::LHAX8; ImmToIdxMap[PPC::LBZ8] = PPC::LBZX8;
139 ImmToIdxMap[PPC::LHZ8] = PPC::LHZX8; ImmToIdxMap[PPC::LWZ8] = PPC::LWZX8;
140 ImmToIdxMap[PPC::STB8] = PPC::STBX8; ImmToIdxMap[PPC::STH8] = PPC::STHX8;
141 ImmToIdxMap[PPC::STW8] = PPC::STWX8; ImmToIdxMap[PPC::STDU] = PPC::STDUX;
142 ImmToIdxMap[PPC::ADDI8] = PPC::ADD8; ImmToIdxMap[PPC::STD_32] = PPC::STDX_32;
145 /// getPointerRegClass - Return the register class to use to hold pointers.
146 /// This is used for addressing modes.
147 const TargetRegisterClass *
148 PPCRegisterInfo::getPointerRegClass(unsigned Kind) const {
149 if (Subtarget.isPPC64())
150 return &PPC::G8RCRegClass;
151 return &PPC::GPRCRegClass;
155 PPCRegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
156 // 32-bit Darwin calling convention.
157 static const unsigned Darwin32_CalleeSavedRegs[] = {
158 PPC::R13, PPC::R14, PPC::R15,
159 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
160 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
161 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
162 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
164 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
165 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
166 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
167 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
170 PPC::CR2, PPC::CR3, PPC::CR4,
171 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
172 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
173 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
175 PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
176 PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
177 PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
182 // 32-bit SVR4 calling convention.
183 static const unsigned SVR4_CalleeSavedRegs[] = {
185 PPC::R16, PPC::R17, PPC::R18, PPC::R19,
186 PPC::R20, PPC::R21, PPC::R22, PPC::R23,
187 PPC::R24, PPC::R25, PPC::R26, PPC::R27,
188 PPC::R28, PPC::R29, PPC::R30, PPC::R31,
190 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
191 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
192 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
193 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
196 PPC::CR2, PPC::CR3, PPC::CR4,
200 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
201 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
202 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
204 PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
205 PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
206 PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
210 // 64-bit Darwin calling convention.
211 static const unsigned Darwin64_CalleeSavedRegs[] = {
213 PPC::X16, PPC::X17, PPC::X18, PPC::X19,
214 PPC::X20, PPC::X21, PPC::X22, PPC::X23,
215 PPC::X24, PPC::X25, PPC::X26, PPC::X27,
216 PPC::X28, PPC::X29, PPC::X30, PPC::X31,
218 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
219 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
220 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
221 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
224 PPC::CR2, PPC::CR3, PPC::CR4,
225 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
226 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
227 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
229 PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
230 PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
231 PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
236 // 64-bit SVR4 calling convention.
237 static const unsigned SVR4_64_CalleeSavedRegs[] = {
239 PPC::X16, PPC::X17, PPC::X18, PPC::X19,
240 PPC::X20, PPC::X21, PPC::X22, PPC::X23,
241 PPC::X24, PPC::X25, PPC::X26, PPC::X27,
242 PPC::X28, PPC::X29, PPC::X30, PPC::X31,
244 PPC::F14, PPC::F15, PPC::F16, PPC::F17,
245 PPC::F18, PPC::F19, PPC::F20, PPC::F21,
246 PPC::F22, PPC::F23, PPC::F24, PPC::F25,
247 PPC::F26, PPC::F27, PPC::F28, PPC::F29,
250 PPC::CR2, PPC::CR3, PPC::CR4,
254 PPC::V20, PPC::V21, PPC::V22, PPC::V23,
255 PPC::V24, PPC::V25, PPC::V26, PPC::V27,
256 PPC::V28, PPC::V29, PPC::V30, PPC::V31,
258 PPC::CR2LT, PPC::CR2GT, PPC::CR2EQ, PPC::CR2UN,
259 PPC::CR3LT, PPC::CR3GT, PPC::CR3EQ, PPC::CR3UN,
260 PPC::CR4LT, PPC::CR4GT, PPC::CR4EQ, PPC::CR4UN,
265 if (Subtarget.isDarwinABI())
266 return Subtarget.isPPC64() ? Darwin64_CalleeSavedRegs :
267 Darwin32_CalleeSavedRegs;
269 return Subtarget.isPPC64() ? SVR4_64_CalleeSavedRegs : SVR4_CalleeSavedRegs;
272 const TargetRegisterClass* const*
273 PPCRegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
274 // 32-bit Darwin calling convention.
275 static const TargetRegisterClass * const Darwin32_CalleeSavedRegClasses[] = {
276 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
277 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
278 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
279 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
280 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
282 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
283 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
284 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
285 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
286 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
288 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
290 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
291 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
292 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
294 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
295 &PPC::CRBITRCRegClass,
296 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
297 &PPC::CRBITRCRegClass,
298 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
299 &PPC::CRBITRCRegClass,
301 &PPC::GPRCRegClass, 0
304 // 32-bit SVR4 calling convention.
305 static const TargetRegisterClass * const SVR4_CalleeSavedRegClasses[] = {
306 &PPC::GPRCRegClass,&PPC::GPRCRegClass,
307 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
308 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
309 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
310 &PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,&PPC::GPRCRegClass,
312 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
313 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
314 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
315 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
316 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
318 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
320 &PPC::VRSAVERCRegClass,
322 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
323 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
324 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
326 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
327 &PPC::CRBITRCRegClass,
328 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
329 &PPC::CRBITRCRegClass,
330 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
331 &PPC::CRBITRCRegClass,
336 // 64-bit Darwin calling convention.
337 static const TargetRegisterClass * const Darwin64_CalleeSavedRegClasses[] = {
338 &PPC::G8RCRegClass,&PPC::G8RCRegClass,
339 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
340 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
341 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
342 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
344 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
345 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
346 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
347 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
348 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
350 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
352 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
353 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
354 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
356 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
357 &PPC::CRBITRCRegClass,
358 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
359 &PPC::CRBITRCRegClass,
360 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
361 &PPC::CRBITRCRegClass,
363 &PPC::G8RCRegClass, 0
366 // 64-bit SVR4 calling convention.
367 static const TargetRegisterClass * const SVR4_64_CalleeSavedRegClasses[] = {
368 &PPC::G8RCRegClass,&PPC::G8RCRegClass,
369 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
370 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
371 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
372 &PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,&PPC::G8RCRegClass,
374 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
375 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
376 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
377 &PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,&PPC::F8RCRegClass,
378 &PPC::F8RCRegClass,&PPC::F8RCRegClass,
380 &PPC::CRRCRegClass,&PPC::CRRCRegClass,&PPC::CRRCRegClass,
382 &PPC::VRSAVERCRegClass,
384 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
385 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
386 &PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,&PPC::VRRCRegClass,
388 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
389 &PPC::CRBITRCRegClass,
390 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
391 &PPC::CRBITRCRegClass,
392 &PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,&PPC::CRBITRCRegClass,
393 &PPC::CRBITRCRegClass,
398 if (Subtarget.isDarwinABI())
399 return Subtarget.isPPC64() ? Darwin64_CalleeSavedRegClasses :
400 Darwin32_CalleeSavedRegClasses;
402 return Subtarget.isPPC64() ? SVR4_64_CalleeSavedRegClasses
403 : SVR4_CalleeSavedRegClasses;
406 // needsFP - Return true if the specified function should have a dedicated frame
407 // pointer register. This is true if the function has variable sized allocas or
408 // if frame pointer elimination is disabled.
410 static bool needsFP(const MachineFunction &MF) {
411 const MachineFrameInfo *MFI = MF.getFrameInfo();
412 // Naked functions have no stack frame pushed, so we don't have a frame pointer.
413 if (MF.getFunction()->hasFnAttr(Attribute::Naked))
415 return DisableFramePointerElim(MF) || MFI->hasVarSizedObjects() ||
416 (GuaranteedTailCallOpt && MF.getInfo<PPCFunctionInfo>()->hasFastCall());
419 static bool spillsCR(const MachineFunction &MF) {
420 const PPCFunctionInfo *FuncInfo = MF.getInfo<PPCFunctionInfo>();
421 return FuncInfo->isCRSpilled();
424 BitVector PPCRegisterInfo::getReservedRegs(const MachineFunction &MF) const {
425 BitVector Reserved(getNumRegs());
426 Reserved.set(PPC::R0);
427 Reserved.set(PPC::R1);
428 Reserved.set(PPC::LR);
429 Reserved.set(PPC::LR8);
430 Reserved.set(PPC::RM);
432 // The SVR4 ABI reserves r2 and r13
433 if (Subtarget.isSVR4ABI()) {
434 Reserved.set(PPC::R2); // System-reserved register
435 Reserved.set(PPC::R13); // Small Data Area pointer register
437 // Reserve R2 on Darwin to hack around the problem of save/restore of CR
438 // when the stack frame is too big to address directly; we need two regs.
440 if (Subtarget.isDarwinABI()) {
441 Reserved.set(PPC::R2);
444 // On PPC64, r13 is the thread pointer. Never allocate this register.
445 // Note that this is over conservative, as it also prevents allocation of R31
446 // when the FP is not needed.
447 if (Subtarget.isPPC64()) {
448 Reserved.set(PPC::R13);
449 Reserved.set(PPC::R31);
451 if (!EnableRegisterScavenging)
452 Reserved.set(PPC::R0); // FIXME (64-bit): Remove
454 Reserved.set(PPC::X0);
455 Reserved.set(PPC::X1);
456 Reserved.set(PPC::X13);
457 Reserved.set(PPC::X31);
459 // The 64-bit SVR4 ABI reserves r2 for the TOC pointer.
460 if (Subtarget.isSVR4ABI()) {
461 Reserved.set(PPC::X2);
463 // Reserve R2 on Darwin to hack around the problem of save/restore of CR
464 // when the stack frame is too big to address directly; we need two regs.
466 if (Subtarget.isDarwinABI()) {
467 Reserved.set(PPC::X2);
472 Reserved.set(PPC::R31);
477 //===----------------------------------------------------------------------===//
478 // Stack Frame Processing methods
479 //===----------------------------------------------------------------------===//
481 // hasFP - Return true if the specified function actually has a dedicated frame
482 // pointer register. This is true if the function needs a frame pointer and has
483 // a non-zero stack size.
484 bool PPCRegisterInfo::hasFP(const MachineFunction &MF) const {
485 const MachineFrameInfo *MFI = MF.getFrameInfo();
486 return MFI->getStackSize() && needsFP(MF);
489 /// MustSaveLR - Return true if this function requires that we save the LR
490 /// register onto the stack in the prolog and restore it in the epilog of the
492 static bool MustSaveLR(const MachineFunction &MF, unsigned LR) {
493 const PPCFunctionInfo *MFI = MF.getInfo<PPCFunctionInfo>();
495 // We need a save/restore of LR if there is any def of LR (which is
496 // defined by calls, including the PIC setup sequence), or if there is
497 // some use of the LR stack slot (e.g. for builtin_return_address).
498 // (LR comes in 32 and 64 bit versions.)
499 MachineRegisterInfo::def_iterator RI = MF.getRegInfo().def_begin(LR);
500 return RI !=MF.getRegInfo().def_end() || MFI->isLRStoreRequired();
505 void PPCRegisterInfo::
506 eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
507 MachineBasicBlock::iterator I) const {
508 if (GuaranteedTailCallOpt && I->getOpcode() == PPC::ADJCALLSTACKUP) {
509 // Add (actually subtract) back the amount the callee popped on return.
510 if (int CalleeAmt = I->getOperand(1).getImm()) {
511 bool is64Bit = Subtarget.isPPC64();
513 unsigned StackReg = is64Bit ? PPC::X1 : PPC::R1;
514 unsigned TmpReg = is64Bit ? PPC::X0 : PPC::R0;
515 unsigned ADDIInstr = is64Bit ? PPC::ADDI8 : PPC::ADDI;
516 unsigned ADDInstr = is64Bit ? PPC::ADD8 : PPC::ADD4;
517 unsigned LISInstr = is64Bit ? PPC::LIS8 : PPC::LIS;
518 unsigned ORIInstr = is64Bit ? PPC::ORI8 : PPC::ORI;
519 MachineInstr *MI = I;
520 DebugLoc dl = MI->getDebugLoc();
522 if (isInt<16>(CalleeAmt)) {
523 BuildMI(MBB, I, dl, TII.get(ADDIInstr), StackReg).addReg(StackReg).
526 MachineBasicBlock::iterator MBBI = I;
527 BuildMI(MBB, MBBI, dl, TII.get(LISInstr), TmpReg)
528 .addImm(CalleeAmt >> 16);
529 BuildMI(MBB, MBBI, dl, TII.get(ORIInstr), TmpReg)
530 .addReg(TmpReg, RegState::Kill)
531 .addImm(CalleeAmt & 0xFFFF);
532 BuildMI(MBB, MBBI, dl, TII.get(ADDInstr))
539 // Simply discard ADJCALLSTACKDOWN, ADJCALLSTACKUP instructions.
543 /// findScratchRegister - Find a 'free' PPC register. Try for a call-clobbered
544 /// register first and then a spilled callee-saved register if that fails.
546 unsigned findScratchRegister(MachineBasicBlock::iterator II, RegScavenger *RS,
547 const TargetRegisterClass *RC, int SPAdj) {
548 assert(RS && "Register scavenging must be on");
549 unsigned Reg = RS->FindUnusedReg(RC);
550 // FIXME: move ARM callee-saved reg scan to target independent code, then
551 // search for already spilled CS register here.
553 Reg = RS->scavengeRegister(RC, II, SPAdj);
557 /// lowerDynamicAlloc - Generate the code for allocating an object in the
558 /// current frame. The sequence of code with be in the general form
560 /// addi R0, SP, \#frameSize ; get the address of the previous frame
561 /// stwxu R0, SP, Rnegsize ; add and update the SP with the negated size
562 /// addi Rnew, SP, \#maxCalFrameSize ; get the top of the allocation
564 void PPCRegisterInfo::lowerDynamicAlloc(MachineBasicBlock::iterator II,
565 int SPAdj, RegScavenger *RS) const {
566 // Get the instruction.
567 MachineInstr &MI = *II;
568 // Get the instruction's basic block.
569 MachineBasicBlock &MBB = *MI.getParent();
570 // Get the basic block's function.
571 MachineFunction &MF = *MBB.getParent();
572 // Get the frame info.
573 MachineFrameInfo *MFI = MF.getFrameInfo();
574 // Determine whether 64-bit pointers are used.
575 bool LP64 = Subtarget.isPPC64();
576 DebugLoc dl = MI.getDebugLoc();
578 // Get the maximum call stack size.
579 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
580 // Get the total frame size.
581 unsigned FrameSize = MFI->getStackSize();
583 // Get stack alignments.
584 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
585 unsigned MaxAlign = MFI->getMaxAlignment();
586 assert(MaxAlign <= TargetAlign &&
587 "Dynamic alloca with large aligns not supported");
589 // Determine the previous frame's address. If FrameSize can't be
590 // represented as 16 bits or we need special alignment, then we load the
591 // previous frame's address from 0(SP). Why not do an addis of the hi?
592 // Because R0 is our only safe tmp register and addi/addis treat R0 as zero.
593 // Constructing the constant and adding would take 3 instructions.
594 // Fortunately, a frame greater than 32K is rare.
595 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
596 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
597 const TargetRegisterClass *RC = LP64 ? G8RC : GPRC;
599 // FIXME (64-bit): Use "findScratchRegister"
601 if (EnableRegisterScavenging)
602 Reg = findScratchRegister(II, RS, RC, SPAdj);
606 if (MaxAlign < TargetAlign && isInt<16>(FrameSize)) {
607 BuildMI(MBB, II, dl, TII.get(PPC::ADDI), Reg)
611 if (EnableRegisterScavenging) // FIXME (64-bit): Use "true" part.
612 BuildMI(MBB, II, dl, TII.get(PPC::LD), Reg)
616 BuildMI(MBB, II, dl, TII.get(PPC::LD), PPC::X0)
620 BuildMI(MBB, II, dl, TII.get(PPC::LWZ), Reg)
625 // Grow the stack and update the stack pointer link, then determine the
626 // address of new allocated space.
628 if (EnableRegisterScavenging) // FIXME (64-bit): Use "true" part.
629 BuildMI(MBB, II, dl, TII.get(PPC::STDUX))
630 .addReg(Reg, RegState::Kill)
632 .addReg(MI.getOperand(1).getReg());
634 BuildMI(MBB, II, dl, TII.get(PPC::STDUX))
635 .addReg(PPC::X0, RegState::Kill)
637 .addReg(MI.getOperand(1).getReg());
639 if (!MI.getOperand(1).isKill())
640 BuildMI(MBB, II, dl, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
642 .addImm(maxCallFrameSize);
644 // Implicitly kill the register.
645 BuildMI(MBB, II, dl, TII.get(PPC::ADDI8), MI.getOperand(0).getReg())
647 .addImm(maxCallFrameSize)
648 .addReg(MI.getOperand(1).getReg(), RegState::ImplicitKill);
650 BuildMI(MBB, II, dl, TII.get(PPC::STWUX))
651 .addReg(Reg, RegState::Kill)
653 .addReg(MI.getOperand(1).getReg());
655 if (!MI.getOperand(1).isKill())
656 BuildMI(MBB, II, dl, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
658 .addImm(maxCallFrameSize);
660 // Implicitly kill the register.
661 BuildMI(MBB, II, dl, TII.get(PPC::ADDI), MI.getOperand(0).getReg())
663 .addImm(maxCallFrameSize)
664 .addReg(MI.getOperand(1).getReg(), RegState::ImplicitKill);
667 // Discard the DYNALLOC instruction.
671 /// lowerCRSpilling - Generate the code for spilling a CR register. Instead of
672 /// reserving a whole register (R0), we scrounge for one here. This generates
675 /// mfcr rA ; Move the conditional register into GPR rA.
676 /// rlwinm rA, rA, SB, 0, 31 ; Shift the bits left so they are in CR0's slot.
677 /// stw rA, FI ; Store rA to the frame.
679 void PPCRegisterInfo::lowerCRSpilling(MachineBasicBlock::iterator II,
680 unsigned FrameIndex, int SPAdj,
681 RegScavenger *RS) const {
682 // Get the instruction.
683 MachineInstr &MI = *II; // ; SPILL_CR <SrcReg>, <offset>, <FI>
684 // Get the instruction's basic block.
685 MachineBasicBlock &MBB = *MI.getParent();
686 DebugLoc dl = MI.getDebugLoc();
688 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
689 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
690 const TargetRegisterClass *RC = Subtarget.isPPC64() ? G8RC : GPRC;
691 unsigned Reg = findScratchRegister(II, RS, RC, SPAdj);
693 // We need to store the CR in the low 4-bits of the saved value. First, issue
694 // an MFCR to save all of the CRBits. Add an implicit kill of the CR.
695 if (!MI.getOperand(0).isKill())
696 BuildMI(MBB, II, dl, TII.get(PPC::MFCR), Reg);
698 // Implicitly kill the CR register.
699 BuildMI(MBB, II, dl, TII.get(PPC::MFCR), Reg)
700 .addReg(MI.getOperand(0).getReg(), RegState::ImplicitKill);
702 // If the saved register wasn't CR0, shift the bits left so that they are in
704 unsigned SrcReg = MI.getOperand(0).getReg();
705 if (SrcReg != PPC::CR0)
706 // rlwinm rA, rA, ShiftBits, 0, 31.
707 BuildMI(MBB, II, dl, TII.get(PPC::RLWINM), Reg)
708 .addReg(Reg, RegState::Kill)
709 .addImm(PPCRegisterInfo::getRegisterNumbering(SrcReg) * 4)
713 addFrameReference(BuildMI(MBB, II, dl, TII.get(PPC::STW))
714 .addReg(Reg, getKillRegState(MI.getOperand(1).getImm())),
717 // Discard the pseudo instruction.
722 PPCRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
723 int SPAdj, FrameIndexValue *Value,
724 RegScavenger *RS) const {
725 assert(SPAdj == 0 && "Unexpected");
727 // Get the instruction.
728 MachineInstr &MI = *II;
729 // Get the instruction's basic block.
730 MachineBasicBlock &MBB = *MI.getParent();
731 // Get the basic block's function.
732 MachineFunction &MF = *MBB.getParent();
733 // Get the frame info.
734 MachineFrameInfo *MFI = MF.getFrameInfo();
735 DebugLoc dl = MI.getDebugLoc();
737 // Find out which operand is the frame index.
738 unsigned FIOperandNo = 0;
739 while (!MI.getOperand(FIOperandNo).isFI()) {
741 assert(FIOperandNo != MI.getNumOperands() &&
742 "Instr doesn't have FrameIndex operand!");
744 // Take into account whether it's an add or mem instruction
745 unsigned OffsetOperandNo = (FIOperandNo == 2) ? 1 : 2;
746 if (MI.isInlineAsm())
747 OffsetOperandNo = FIOperandNo-1;
749 // Get the frame index.
750 int FrameIndex = MI.getOperand(FIOperandNo).getIndex();
752 // Get the frame pointer save index. Users of this index are primarily
753 // DYNALLOC instructions.
754 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
755 int FPSI = FI->getFramePointerSaveIndex();
756 // Get the instruction opcode.
757 unsigned OpC = MI.getOpcode();
759 // Special case for dynamic alloca.
760 if (FPSI && FrameIndex == FPSI &&
761 (OpC == PPC::DYNALLOC || OpC == PPC::DYNALLOC8)) {
762 lowerDynamicAlloc(II, SPAdj, RS);
766 // Special case for pseudo-op SPILL_CR.
767 if (EnableRegisterScavenging) // FIXME (64-bit): Enable by default.
768 if (OpC == PPC::SPILL_CR) {
769 lowerCRSpilling(II, FrameIndex, SPAdj, RS);
773 // Replace the FrameIndex with base register with GPR1 (SP) or GPR31 (FP).
774 MI.getOperand(FIOperandNo).ChangeToRegister(hasFP(MF) ? PPC::R31 : PPC::R1,
777 // Figure out if the offset in the instruction is shifted right two bits. This
778 // is true for instructions like "STD", which the machine implicitly adds two
780 bool isIXAddr = false;
790 // Now add the frame object offset to the offset from r1.
791 int Offset = MFI->getObjectOffset(FrameIndex);
793 Offset += MI.getOperand(OffsetOperandNo).getImm();
795 Offset += MI.getOperand(OffsetOperandNo).getImm() << 2;
797 // If we're not using a Frame Pointer that has been set to the value of the
798 // SP before having the stack size subtracted from it, then add the stack size
799 // to Offset to get the correct offset.
800 // Naked functions have stack size 0, although getStackSize may not reflect that
801 // because we didn't call all the pieces that compute it for naked functions.
802 if (!MF.getFunction()->hasFnAttr(Attribute::Naked))
803 Offset += MFI->getStackSize();
805 // If we can, encode the offset directly into the instruction. If this is a
806 // normal PPC "ri" instruction, any 16-bit value can be safely encoded. If
807 // this is a PPC64 "ix" instruction, only a 16-bit value with the low two bits
808 // clear can be encoded. This is extremely uncommon, because normally you
809 // only "std" to a stack slot that is at least 4-byte aligned, but it can
810 // happen in invalid code.
811 if (isInt<16>(Offset) && (!isIXAddr || (Offset & 3) == 0)) {
813 Offset >>= 2; // The actual encoded value has the low two bits zero.
814 MI.getOperand(OffsetOperandNo).ChangeToImmediate(Offset);
818 // The offset doesn't fit into a single register, scavenge one to build the
820 // FIXME: figure out what SPAdj is doing here.
822 // FIXME (64-bit): Use "findScratchRegister".
824 if (EnableRegisterScavenging)
825 SReg = findScratchRegister(II, RS, &PPC::GPRCRegClass, SPAdj);
829 // Insert a set of rA with the full offset value before the ld, st, or add
830 BuildMI(MBB, II, dl, TII.get(PPC::LIS), SReg)
831 .addImm(Offset >> 16);
832 BuildMI(MBB, II, dl, TII.get(PPC::ORI), SReg)
833 .addReg(SReg, RegState::Kill)
836 // Convert into indexed form of the instruction:
838 // sth 0:rA, 1:imm 2:(rB) ==> sthx 0:rA, 2:rB, 1:r0
839 // addi 0:rA 1:rB, 2, imm ==> add 0:rA, 1:rB, 2:r0
840 unsigned OperandBase;
842 if (OpC != TargetOpcode::INLINEASM) {
843 assert(ImmToIdxMap.count(OpC) &&
844 "No indexed form of load or store available!");
845 unsigned NewOpcode = ImmToIdxMap.find(OpC)->second;
846 MI.setDesc(TII.get(NewOpcode));
849 OperandBase = OffsetOperandNo;
852 unsigned StackReg = MI.getOperand(FIOperandNo).getReg();
853 MI.getOperand(OperandBase).ChangeToRegister(StackReg, false);
854 MI.getOperand(OperandBase + 1).ChangeToRegister(SReg, false);
858 /// VRRegNo - Map from a numbered VR register to its enum value.
860 static const unsigned short VRRegNo[] = {
861 PPC::V0 , PPC::V1 , PPC::V2 , PPC::V3 , PPC::V4 , PPC::V5 , PPC::V6 , PPC::V7 ,
862 PPC::V8 , PPC::V9 , PPC::V10, PPC::V11, PPC::V12, PPC::V13, PPC::V14, PPC::V15,
863 PPC::V16, PPC::V17, PPC::V18, PPC::V19, PPC::V20, PPC::V21, PPC::V22, PPC::V23,
864 PPC::V24, PPC::V25, PPC::V26, PPC::V27, PPC::V28, PPC::V29, PPC::V30, PPC::V31
867 /// RemoveVRSaveCode - We have found that this function does not need any code
868 /// to manipulate the VRSAVE register, even though it uses vector registers.
869 /// This can happen when the only registers used are known to be live in or out
870 /// of the function. Remove all of the VRSAVE related code from the function.
871 static void RemoveVRSaveCode(MachineInstr *MI) {
872 MachineBasicBlock *Entry = MI->getParent();
873 MachineFunction *MF = Entry->getParent();
875 // We know that the MTVRSAVE instruction immediately follows MI. Remove it.
876 MachineBasicBlock::iterator MBBI = MI;
878 assert(MBBI != Entry->end() && MBBI->getOpcode() == PPC::MTVRSAVE);
879 MBBI->eraseFromParent();
881 bool RemovedAllMTVRSAVEs = true;
882 // See if we can find and remove the MTVRSAVE instruction from all of the
884 for (MachineFunction::iterator I = MF->begin(), E = MF->end(); I != E; ++I) {
885 // If last instruction is a return instruction, add an epilogue
886 if (!I->empty() && I->back().getDesc().isReturn()) {
887 bool FoundIt = false;
888 for (MBBI = I->end(); MBBI != I->begin(); ) {
890 if (MBBI->getOpcode() == PPC::MTVRSAVE) {
891 MBBI->eraseFromParent(); // remove it.
896 RemovedAllMTVRSAVEs &= FoundIt;
900 // If we found and removed all MTVRSAVE instructions, remove the read of
902 if (RemovedAllMTVRSAVEs) {
904 assert(MBBI != Entry->begin() && "UPDATE_VRSAVE is first instr in block?");
906 assert(MBBI->getOpcode() == PPC::MFVRSAVE && "VRSAVE instrs wandered?");
907 MBBI->eraseFromParent();
910 // Finally, nuke the UPDATE_VRSAVE.
911 MI->eraseFromParent();
914 // HandleVRSaveUpdate - MI is the UPDATE_VRSAVE instruction introduced by the
915 // instruction selector. Based on the vector registers that have been used,
916 // transform this into the appropriate ORI instruction.
917 static void HandleVRSaveUpdate(MachineInstr *MI, const TargetInstrInfo &TII) {
918 MachineFunction *MF = MI->getParent()->getParent();
919 DebugLoc dl = MI->getDebugLoc();
921 unsigned UsedRegMask = 0;
922 for (unsigned i = 0; i != 32; ++i)
923 if (MF->getRegInfo().isPhysRegUsed(VRRegNo[i]))
924 UsedRegMask |= 1 << (31-i);
926 // Live in and live out values already must be in the mask, so don't bother
928 for (MachineRegisterInfo::livein_iterator
929 I = MF->getRegInfo().livein_begin(),
930 E = MF->getRegInfo().livein_end(); I != E; ++I) {
931 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(I->first);
932 if (VRRegNo[RegNo] == I->first) // If this really is a vector reg.
933 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
935 for (MachineRegisterInfo::liveout_iterator
936 I = MF->getRegInfo().liveout_begin(),
937 E = MF->getRegInfo().liveout_end(); I != E; ++I) {
938 unsigned RegNo = PPCRegisterInfo::getRegisterNumbering(*I);
939 if (VRRegNo[RegNo] == *I) // If this really is a vector reg.
940 UsedRegMask &= ~(1 << (31-RegNo)); // Doesn't need to be marked.
943 // If no registers are used, turn this into a copy.
944 if (UsedRegMask == 0) {
945 // Remove all VRSAVE code.
946 RemoveVRSaveCode(MI);
950 unsigned SrcReg = MI->getOperand(1).getReg();
951 unsigned DstReg = MI->getOperand(0).getReg();
953 if ((UsedRegMask & 0xFFFF) == UsedRegMask) {
954 if (DstReg != SrcReg)
955 BuildMI(*MI->getParent(), MI, dl, TII.get(PPC::ORI), DstReg)
957 .addImm(UsedRegMask);
959 BuildMI(*MI->getParent(), MI, dl, TII.get(PPC::ORI), DstReg)
960 .addReg(SrcReg, RegState::Kill)
961 .addImm(UsedRegMask);
962 } else if ((UsedRegMask & 0xFFFF0000) == UsedRegMask) {
963 if (DstReg != SrcReg)
964 BuildMI(*MI->getParent(), MI, dl, TII.get(PPC::ORIS), DstReg)
966 .addImm(UsedRegMask >> 16);
968 BuildMI(*MI->getParent(), MI, dl, TII.get(PPC::ORIS), DstReg)
969 .addReg(SrcReg, RegState::Kill)
970 .addImm(UsedRegMask >> 16);
972 if (DstReg != SrcReg)
973 BuildMI(*MI->getParent(), MI, dl, TII.get(PPC::ORIS), DstReg)
975 .addImm(UsedRegMask >> 16);
977 BuildMI(*MI->getParent(), MI, dl, TII.get(PPC::ORIS), DstReg)
978 .addReg(SrcReg, RegState::Kill)
979 .addImm(UsedRegMask >> 16);
981 BuildMI(*MI->getParent(), MI, dl, TII.get(PPC::ORI), DstReg)
982 .addReg(DstReg, RegState::Kill)
983 .addImm(UsedRegMask & 0xFFFF);
986 // Remove the old UPDATE_VRSAVE instruction.
987 MI->eraseFromParent();
990 /// determineFrameLayout - Determine the size of the frame and maximum call
992 void PPCRegisterInfo::determineFrameLayout(MachineFunction &MF) const {
993 MachineFrameInfo *MFI = MF.getFrameInfo();
995 // Get the number of bytes to allocate from the FrameInfo
996 unsigned FrameSize = MFI->getStackSize();
998 // Get the alignments provided by the target, and the maximum alignment
999 // (if any) of the fixed frame objects.
1000 unsigned MaxAlign = MFI->getMaxAlignment();
1001 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1002 unsigned AlignMask = TargetAlign - 1; //
1004 // If we are a leaf function, and use up to 224 bytes of stack space,
1005 // don't have a frame pointer, calls, or dynamic alloca then we do not need
1006 // to adjust the stack pointer (we fit in the Red Zone).
1007 bool DisableRedZone = MF.getFunction()->hasFnAttr(Attribute::NoRedZone);
1008 // FIXME SVR4 The 32-bit SVR4 ABI has no red zone.
1009 if (!DisableRedZone &&
1010 FrameSize <= 224 && // Fits in red zone.
1011 !MFI->hasVarSizedObjects() && // No dynamic alloca.
1012 !MFI->adjustsStack() && // No calls.
1013 (!ALIGN_STACK || MaxAlign <= TargetAlign)) { // No special alignment.
1014 // No need for frame
1015 MFI->setStackSize(0);
1019 // Get the maximum call frame size of all the calls.
1020 unsigned maxCallFrameSize = MFI->getMaxCallFrameSize();
1022 // Maximum call frame needs to be at least big enough for linkage and 8 args.
1023 unsigned minCallFrameSize =
1024 PPCFrameInfo::getMinCallFrameSize(Subtarget.isPPC64(),
1025 Subtarget.isDarwinABI());
1026 maxCallFrameSize = std::max(maxCallFrameSize, minCallFrameSize);
1028 // If we have dynamic alloca then maxCallFrameSize needs to be aligned so
1029 // that allocations will be aligned.
1030 if (MFI->hasVarSizedObjects())
1031 maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
1033 // Update maximum call frame size.
1034 MFI->setMaxCallFrameSize(maxCallFrameSize);
1036 // Include call frame size in total.
1037 FrameSize += maxCallFrameSize;
1039 // Make sure the frame is aligned.
1040 FrameSize = (FrameSize + AlignMask) & ~AlignMask;
1042 // Update frame info.
1043 MFI->setStackSize(FrameSize);
1047 PPCRegisterInfo::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
1048 RegScavenger *RS) const {
1049 // Save and clear the LR state.
1050 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
1051 unsigned LR = getRARegister();
1052 FI->setMustSaveLR(MustSaveLR(MF, LR));
1053 MF.getRegInfo().setPhysRegUnused(LR);
1055 // Save R31 if necessary
1056 int FPSI = FI->getFramePointerSaveIndex();
1057 bool isPPC64 = Subtarget.isPPC64();
1058 bool isDarwinABI = Subtarget.isDarwinABI();
1059 MachineFrameInfo *MFI = MF.getFrameInfo();
1061 // If the frame pointer save index hasn't been defined yet.
1062 if (!FPSI && needsFP(MF)) {
1063 // Find out what the fix offset of the frame pointer save area.
1064 int FPOffset = PPCFrameInfo::getFramePointerSaveOffset(isPPC64,
1066 // Allocate the frame index for frame pointer save area.
1067 FPSI = MF.getFrameInfo()->CreateFixedObject(isPPC64? 8 : 4, FPOffset,
1070 FI->setFramePointerSaveIndex(FPSI);
1073 // Reserve stack space to move the linkage area to in case of a tail call.
1075 if (GuaranteedTailCallOpt && (TCSPDelta = FI->getTailCallSPDelta()) < 0) {
1076 MF.getFrameInfo()->CreateFixedObject(-1 * TCSPDelta, TCSPDelta,
1080 // Reserve a slot closest to SP or frame pointer if we have a dynalloc or
1081 // a large stack, which will require scavenging a register to materialize a
1083 // FIXME: this doesn't actually check stack size, so is a bit pessimistic
1084 // FIXME: doesn't detect whether or not we need to spill vXX, which requires
1087 if (EnableRegisterScavenging) // FIXME (64-bit): Enable.
1088 if (needsFP(MF) || spillsCR(MF)) {
1089 const TargetRegisterClass *GPRC = &PPC::GPRCRegClass;
1090 const TargetRegisterClass *G8RC = &PPC::G8RCRegClass;
1091 const TargetRegisterClass *RC = isPPC64 ? G8RC : GPRC;
1092 RS->setScavengingFrameIndex(MFI->CreateStackObject(RC->getSize(),
1099 PPCRegisterInfo::processFunctionBeforeFrameFinalized(MachineFunction &MF)
1101 // Early exit if not using the SVR4 ABI.
1102 if (!Subtarget.isSVR4ABI()) {
1106 // Get callee saved register information.
1107 MachineFrameInfo *FFI = MF.getFrameInfo();
1108 const std::vector<CalleeSavedInfo> &CSI = FFI->getCalleeSavedInfo();
1110 // Early exit if no callee saved registers are modified!
1111 if (CSI.empty() && !needsFP(MF)) {
1115 unsigned MinGPR = PPC::R31;
1116 unsigned MinG8R = PPC::X31;
1117 unsigned MinFPR = PPC::F31;
1118 unsigned MinVR = PPC::V31;
1120 bool HasGPSaveArea = false;
1121 bool HasG8SaveArea = false;
1122 bool HasFPSaveArea = false;
1123 bool HasCRSaveArea = false;
1124 bool HasVRSAVESaveArea = false;
1125 bool HasVRSaveArea = false;
1127 SmallVector<CalleeSavedInfo, 18> GPRegs;
1128 SmallVector<CalleeSavedInfo, 18> G8Regs;
1129 SmallVector<CalleeSavedInfo, 18> FPRegs;
1130 SmallVector<CalleeSavedInfo, 18> VRegs;
1132 for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
1133 unsigned Reg = CSI[i].getReg();
1134 const TargetRegisterClass *RC = CSI[i].getRegClass();
1136 if (RC == PPC::GPRCRegisterClass) {
1137 HasGPSaveArea = true;
1139 GPRegs.push_back(CSI[i]);
1144 } else if (RC == PPC::G8RCRegisterClass) {
1145 HasG8SaveArea = true;
1147 G8Regs.push_back(CSI[i]);
1152 } else if (RC == PPC::F8RCRegisterClass) {
1153 HasFPSaveArea = true;
1155 FPRegs.push_back(CSI[i]);
1160 // FIXME SVR4: Disable CR save area for now.
1161 } else if ( RC == PPC::CRBITRCRegisterClass
1162 || RC == PPC::CRRCRegisterClass) {
1163 // HasCRSaveArea = true;
1164 } else if (RC == PPC::VRSAVERCRegisterClass) {
1165 HasVRSAVESaveArea = true;
1166 } else if (RC == PPC::VRRCRegisterClass) {
1167 HasVRSaveArea = true;
1169 VRegs.push_back(CSI[i]);
1175 llvm_unreachable("Unknown RegisterClass!");
1179 PPCFunctionInfo *PFI = MF.getInfo<PPCFunctionInfo>();
1181 int64_t LowerBound = 0;
1183 // Take into account stack space reserved for tail calls.
1185 if (GuaranteedTailCallOpt && (TCSPDelta = PFI->getTailCallSPDelta()) < 0) {
1186 LowerBound = TCSPDelta;
1189 // The Floating-point register save area is right below the back chain word
1190 // of the previous stack frame.
1191 if (HasFPSaveArea) {
1192 for (unsigned i = 0, e = FPRegs.size(); i != e; ++i) {
1193 int FI = FPRegs[i].getFrameIdx();
1195 FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
1198 LowerBound -= (31 - getRegisterNumbering(MinFPR) + 1) * 8;
1201 // Check whether the frame pointer register is allocated. If so, make sure it
1202 // is spilled to the correct offset.
1204 HasGPSaveArea = true;
1206 int FI = PFI->getFramePointerSaveIndex();
1207 assert(FI && "No Frame Pointer Save Slot!");
1209 FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
1212 // General register save area starts right below the Floating-point
1213 // register save area.
1214 if (HasGPSaveArea || HasG8SaveArea) {
1215 // Move general register save area spill slots down, taking into account
1216 // the size of the Floating-point register save area.
1217 for (unsigned i = 0, e = GPRegs.size(); i != e; ++i) {
1218 int FI = GPRegs[i].getFrameIdx();
1220 FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
1223 // Move general register save area spill slots down, taking into account
1224 // the size of the Floating-point register save area.
1225 for (unsigned i = 0, e = G8Regs.size(); i != e; ++i) {
1226 int FI = G8Regs[i].getFrameIdx();
1228 FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
1231 unsigned MinReg = std::min<unsigned>(getRegisterNumbering(MinGPR),
1232 getRegisterNumbering(MinG8R));
1234 if (Subtarget.isPPC64()) {
1235 LowerBound -= (31 - MinReg + 1) * 8;
1237 LowerBound -= (31 - MinReg + 1) * 4;
1241 // The CR save area is below the general register save area.
1242 if (HasCRSaveArea) {
1243 // FIXME SVR4: Is it actually possible to have multiple elements in CSI
1244 // which have the CR/CRBIT register class?
1245 // Adjust the frame index of the CR spill slot.
1246 for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
1247 const TargetRegisterClass *RC = CSI[i].getRegClass();
1249 if (RC == PPC::CRBITRCRegisterClass || RC == PPC::CRRCRegisterClass) {
1250 int FI = CSI[i].getFrameIdx();
1252 FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
1256 LowerBound -= 4; // The CR save area is always 4 bytes long.
1259 if (HasVRSAVESaveArea) {
1260 // FIXME SVR4: Is it actually possible to have multiple elements in CSI
1261 // which have the VRSAVE register class?
1262 // Adjust the frame index of the VRSAVE spill slot.
1263 for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
1264 const TargetRegisterClass *RC = CSI[i].getRegClass();
1266 if (RC == PPC::VRSAVERCRegisterClass) {
1267 int FI = CSI[i].getFrameIdx();
1269 FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
1273 LowerBound -= 4; // The VRSAVE save area is always 4 bytes long.
1276 if (HasVRSaveArea) {
1277 // Insert alignment padding, we need 16-byte alignment.
1278 LowerBound = (LowerBound - 15) & ~(15);
1280 for (unsigned i = 0, e = VRegs.size(); i != e; ++i) {
1281 int FI = VRegs[i].getFrameIdx();
1283 FFI->setObjectOffset(FI, LowerBound + FFI->getObjectOffset(FI));
1289 PPCRegisterInfo::emitPrologue(MachineFunction &MF) const {
1290 MachineBasicBlock &MBB = MF.front(); // Prolog goes in entry BB
1291 MachineBasicBlock::iterator MBBI = MBB.begin();
1292 MachineFrameInfo *MFI = MF.getFrameInfo();
1293 MachineModuleInfo &MMI = MF.getMMI();
1295 bool needsFrameMoves = MMI.hasDebugInfo() ||
1296 !MF.getFunction()->doesNotThrow() ||
1297 UnwindTablesMandatory;
1299 // Prepare for frame info.
1300 MCSymbol *FrameLabel = 0;
1302 // Scan the prolog, looking for an UPDATE_VRSAVE instruction. If we find it,
1304 for (unsigned i = 0; MBBI != MBB.end(); ++i, ++MBBI) {
1305 if (MBBI->getOpcode() == PPC::UPDATE_VRSAVE) {
1306 HandleVRSaveUpdate(MBBI, TII);
1311 // Move MBBI back to the beginning of the function.
1314 // Work out frame sizes.
1315 determineFrameLayout(MF);
1316 unsigned FrameSize = MFI->getStackSize();
1318 int NegFrameSize = -FrameSize;
1320 // Get processor type.
1321 bool isPPC64 = Subtarget.isPPC64();
1322 // Get operating system
1323 bool isDarwinABI = Subtarget.isDarwinABI();
1324 // Check if the link register (LR) must be saved.
1325 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
1326 bool MustSaveLR = FI->mustSaveLR();
1327 // Do we have a frame pointer for this function?
1328 bool HasFP = hasFP(MF) && FrameSize;
1330 int LROffset = PPCFrameInfo::getReturnSaveOffset(isPPC64, isDarwinABI);
1334 if (Subtarget.isSVR4ABI()) {
1335 MachineFrameInfo *FFI = MF.getFrameInfo();
1336 int FPIndex = FI->getFramePointerSaveIndex();
1337 assert(FPIndex && "No Frame Pointer Save Slot!");
1338 FPOffset = FFI->getObjectOffset(FPIndex);
1340 FPOffset = PPCFrameInfo::getFramePointerSaveOffset(isPPC64, isDarwinABI);
1346 BuildMI(MBB, MBBI, dl, TII.get(PPC::MFLR8), PPC::X0);
1349 BuildMI(MBB, MBBI, dl, TII.get(PPC::STD))
1355 BuildMI(MBB, MBBI, dl, TII.get(PPC::STD))
1357 .addImm(LROffset / 4)
1361 BuildMI(MBB, MBBI, dl, TII.get(PPC::MFLR), PPC::R0);
1364 BuildMI(MBB, MBBI, dl, TII.get(PPC::STW))
1370 BuildMI(MBB, MBBI, dl, TII.get(PPC::STW))
1376 // Skip if a leaf routine.
1377 if (!FrameSize) return;
1379 // Get stack alignments.
1380 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1381 unsigned MaxAlign = MFI->getMaxAlignment();
1383 // Adjust stack pointer: r1 += NegFrameSize.
1384 // If there is a preferred stack alignment, align R1 now
1387 if (ALIGN_STACK && MaxAlign > TargetAlign) {
1388 assert(isPowerOf2_32(MaxAlign) && isInt<16>(MaxAlign) &&
1389 "Invalid alignment!");
1390 assert(isInt<16>(NegFrameSize) && "Unhandled stack size and alignment!");
1392 BuildMI(MBB, MBBI, dl, TII.get(PPC::RLWINM), PPC::R0)
1395 .addImm(32 - Log2_32(MaxAlign))
1397 BuildMI(MBB, MBBI, dl, TII.get(PPC::SUBFIC) ,PPC::R0)
1398 .addReg(PPC::R0, RegState::Kill)
1399 .addImm(NegFrameSize);
1400 BuildMI(MBB, MBBI, dl, TII.get(PPC::STWUX))
1404 } else if (isInt<16>(NegFrameSize)) {
1405 BuildMI(MBB, MBBI, dl, TII.get(PPC::STWU), PPC::R1)
1407 .addImm(NegFrameSize)
1410 BuildMI(MBB, MBBI, dl, TII.get(PPC::LIS), PPC::R0)
1411 .addImm(NegFrameSize >> 16);
1412 BuildMI(MBB, MBBI, dl, TII.get(PPC::ORI), PPC::R0)
1413 .addReg(PPC::R0, RegState::Kill)
1414 .addImm(NegFrameSize & 0xFFFF);
1415 BuildMI(MBB, MBBI, dl, TII.get(PPC::STWUX))
1421 if (ALIGN_STACK && MaxAlign > TargetAlign) {
1422 assert(isPowerOf2_32(MaxAlign) && isInt<16>(MaxAlign) &&
1423 "Invalid alignment!");
1424 assert(isInt<16>(NegFrameSize) && "Unhandled stack size and alignment!");
1426 BuildMI(MBB, MBBI, dl, TII.get(PPC::RLDICL), PPC::X0)
1429 .addImm(64 - Log2_32(MaxAlign));
1430 BuildMI(MBB, MBBI, dl, TII.get(PPC::SUBFIC8), PPC::X0)
1432 .addImm(NegFrameSize);
1433 BuildMI(MBB, MBBI, dl, TII.get(PPC::STDUX))
1437 } else if (isInt<16>(NegFrameSize)) {
1438 BuildMI(MBB, MBBI, dl, TII.get(PPC::STDU), PPC::X1)
1440 .addImm(NegFrameSize / 4)
1443 BuildMI(MBB, MBBI, dl, TII.get(PPC::LIS8), PPC::X0)
1444 .addImm(NegFrameSize >> 16);
1445 BuildMI(MBB, MBBI, dl, TII.get(PPC::ORI8), PPC::X0)
1446 .addReg(PPC::X0, RegState::Kill)
1447 .addImm(NegFrameSize & 0xFFFF);
1448 BuildMI(MBB, MBBI, dl, TII.get(PPC::STDUX))
1455 std::vector<MachineMove> &Moves = MMI.getFrameMoves();
1457 // Add the "machine moves" for the instructions we generated above, but in
1459 if (needsFrameMoves) {
1460 // Mark effective beginning of when frame pointer becomes valid.
1461 FrameLabel = MMI.getContext().CreateTempSymbol();
1462 BuildMI(MBB, MBBI, dl, TII.get(PPC::DBG_LABEL)).addSym(FrameLabel);
1464 // Show update of SP.
1466 MachineLocation SPDst(MachineLocation::VirtualFP);
1467 MachineLocation SPSrc(MachineLocation::VirtualFP, NegFrameSize);
1468 Moves.push_back(MachineMove(FrameLabel, SPDst, SPSrc));
1470 MachineLocation SP(isPPC64 ? PPC::X31 : PPC::R31);
1471 Moves.push_back(MachineMove(FrameLabel, SP, SP));
1475 MachineLocation FPDst(MachineLocation::VirtualFP, FPOffset);
1476 MachineLocation FPSrc(isPPC64 ? PPC::X31 : PPC::R31);
1477 Moves.push_back(MachineMove(FrameLabel, FPDst, FPSrc));
1481 MachineLocation LRDst(MachineLocation::VirtualFP, LROffset);
1482 MachineLocation LRSrc(isPPC64 ? PPC::LR8 : PPC::LR);
1483 Moves.push_back(MachineMove(FrameLabel, LRDst, LRSrc));
1487 MCSymbol *ReadyLabel = 0;
1489 // If there is a frame pointer, copy R1 into R31
1492 BuildMI(MBB, MBBI, dl, TII.get(PPC::OR), PPC::R31)
1496 BuildMI(MBB, MBBI, dl, TII.get(PPC::OR8), PPC::X31)
1501 if (needsFrameMoves) {
1502 ReadyLabel = MMI.getContext().CreateTempSymbol();
1504 // Mark effective beginning of when frame pointer is ready.
1505 BuildMI(MBB, MBBI, dl, TII.get(PPC::DBG_LABEL)).addSym(ReadyLabel);
1507 MachineLocation FPDst(HasFP ? (isPPC64 ? PPC::X31 : PPC::R31) :
1508 (isPPC64 ? PPC::X1 : PPC::R1));
1509 MachineLocation FPSrc(MachineLocation::VirtualFP);
1510 Moves.push_back(MachineMove(ReadyLabel, FPDst, FPSrc));
1514 if (needsFrameMoves) {
1515 MCSymbol *Label = HasFP ? ReadyLabel : FrameLabel;
1517 // Add callee saved registers to move list.
1518 const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
1519 for (unsigned I = 0, E = CSI.size(); I != E; ++I) {
1520 int Offset = MFI->getObjectOffset(CSI[I].getFrameIdx());
1521 unsigned Reg = CSI[I].getReg();
1522 if (Reg == PPC::LR || Reg == PPC::LR8 || Reg == PPC::RM) continue;
1523 MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
1524 MachineLocation CSSrc(Reg);
1525 Moves.push_back(MachineMove(Label, CSDst, CSSrc));
1530 void PPCRegisterInfo::emitEpilogue(MachineFunction &MF,
1531 MachineBasicBlock &MBB) const {
1532 MachineBasicBlock::iterator MBBI = prior(MBB.end());
1533 unsigned RetOpcode = MBBI->getOpcode();
1536 assert( (RetOpcode == PPC::BLR ||
1537 RetOpcode == PPC::TCRETURNri ||
1538 RetOpcode == PPC::TCRETURNdi ||
1539 RetOpcode == PPC::TCRETURNai ||
1540 RetOpcode == PPC::TCRETURNri8 ||
1541 RetOpcode == PPC::TCRETURNdi8 ||
1542 RetOpcode == PPC::TCRETURNai8) &&
1543 "Can only insert epilog into returning blocks");
1545 // Get alignment info so we know how to restore r1
1546 const MachineFrameInfo *MFI = MF.getFrameInfo();
1547 unsigned TargetAlign = MF.getTarget().getFrameInfo()->getStackAlignment();
1548 unsigned MaxAlign = MFI->getMaxAlignment();
1550 // Get the number of bytes allocated from the FrameInfo.
1551 int FrameSize = MFI->getStackSize();
1553 // Get processor type.
1554 bool isPPC64 = Subtarget.isPPC64();
1555 // Get operating system
1556 bool isDarwinABI = Subtarget.isDarwinABI();
1557 // Check if the link register (LR) has been saved.
1558 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
1559 bool MustSaveLR = FI->mustSaveLR();
1560 // Do we have a frame pointer for this function?
1561 bool HasFP = hasFP(MF) && FrameSize;
1563 int LROffset = PPCFrameInfo::getReturnSaveOffset(isPPC64, isDarwinABI);
1567 if (Subtarget.isSVR4ABI()) {
1568 MachineFrameInfo *FFI = MF.getFrameInfo();
1569 int FPIndex = FI->getFramePointerSaveIndex();
1570 assert(FPIndex && "No Frame Pointer Save Slot!");
1571 FPOffset = FFI->getObjectOffset(FPIndex);
1573 FPOffset = PPCFrameInfo::getFramePointerSaveOffset(isPPC64, isDarwinABI);
1577 bool UsesTCRet = RetOpcode == PPC::TCRETURNri ||
1578 RetOpcode == PPC::TCRETURNdi ||
1579 RetOpcode == PPC::TCRETURNai ||
1580 RetOpcode == PPC::TCRETURNri8 ||
1581 RetOpcode == PPC::TCRETURNdi8 ||
1582 RetOpcode == PPC::TCRETURNai8;
1585 int MaxTCRetDelta = FI->getTailCallSPDelta();
1586 MachineOperand &StackAdjust = MBBI->getOperand(1);
1587 assert(StackAdjust.isImm() && "Expecting immediate value.");
1588 // Adjust stack pointer.
1589 int StackAdj = StackAdjust.getImm();
1590 int Delta = StackAdj - MaxTCRetDelta;
1591 assert((Delta >= 0) && "Delta must be positive");
1592 if (MaxTCRetDelta>0)
1593 FrameSize += (StackAdj +Delta);
1595 FrameSize += StackAdj;
1599 // The loaded (or persistent) stack pointer value is offset by the 'stwu'
1600 // on entry to the function. Add this offset back now.
1602 // If this function contained a fastcc call and GuaranteedTailCallOpt is
1603 // enabled (=> hasFastCall()==true) the fastcc call might contain a tail
1604 // call which invalidates the stack pointer value in SP(0). So we use the
1605 // value of R31 in this case.
1606 if (FI->hasFastCall() && isInt<16>(FrameSize)) {
1607 assert(hasFP(MF) && "Expecting a valid the frame pointer.");
1608 BuildMI(MBB, MBBI, dl, TII.get(PPC::ADDI), PPC::R1)
1609 .addReg(PPC::R31).addImm(FrameSize);
1610 } else if(FI->hasFastCall()) {
1611 BuildMI(MBB, MBBI, dl, TII.get(PPC::LIS), PPC::R0)
1612 .addImm(FrameSize >> 16);
1613 BuildMI(MBB, MBBI, dl, TII.get(PPC::ORI), PPC::R0)
1614 .addReg(PPC::R0, RegState::Kill)
1615 .addImm(FrameSize & 0xFFFF);
1616 BuildMI(MBB, MBBI, dl, TII.get(PPC::ADD4))
1620 } else if (isInt<16>(FrameSize) &&
1621 (!ALIGN_STACK || TargetAlign >= MaxAlign) &&
1622 !MFI->hasVarSizedObjects()) {
1623 BuildMI(MBB, MBBI, dl, TII.get(PPC::ADDI), PPC::R1)
1624 .addReg(PPC::R1).addImm(FrameSize);
1626 BuildMI(MBB, MBBI, dl, TII.get(PPC::LWZ),PPC::R1)
1627 .addImm(0).addReg(PPC::R1);
1630 if (FI->hasFastCall() && isInt<16>(FrameSize)) {
1631 assert(hasFP(MF) && "Expecting a valid the frame pointer.");
1632 BuildMI(MBB, MBBI, dl, TII.get(PPC::ADDI8), PPC::X1)
1633 .addReg(PPC::X31).addImm(FrameSize);
1634 } else if(FI->hasFastCall()) {
1635 BuildMI(MBB, MBBI, dl, TII.get(PPC::LIS8), PPC::X0)
1636 .addImm(FrameSize >> 16);
1637 BuildMI(MBB, MBBI, dl, TII.get(PPC::ORI8), PPC::X0)
1638 .addReg(PPC::X0, RegState::Kill)
1639 .addImm(FrameSize & 0xFFFF);
1640 BuildMI(MBB, MBBI, dl, TII.get(PPC::ADD8))
1644 } else if (isInt<16>(FrameSize) && TargetAlign >= MaxAlign &&
1645 !MFI->hasVarSizedObjects()) {
1646 BuildMI(MBB, MBBI, dl, TII.get(PPC::ADDI8), PPC::X1)
1647 .addReg(PPC::X1).addImm(FrameSize);
1649 BuildMI(MBB, MBBI, dl, TII.get(PPC::LD), PPC::X1)
1650 .addImm(0).addReg(PPC::X1);
1657 BuildMI(MBB, MBBI, dl, TII.get(PPC::LD), PPC::X0)
1658 .addImm(LROffset/4).addReg(PPC::X1);
1661 BuildMI(MBB, MBBI, dl, TII.get(PPC::LD), PPC::X31)
1662 .addImm(FPOffset/4).addReg(PPC::X1);
1665 BuildMI(MBB, MBBI, dl, TII.get(PPC::MTLR8)).addReg(PPC::X0);
1668 BuildMI(MBB, MBBI, dl, TII.get(PPC::LWZ), PPC::R0)
1669 .addImm(LROffset).addReg(PPC::R1);
1672 BuildMI(MBB, MBBI, dl, TII.get(PPC::LWZ), PPC::R31)
1673 .addImm(FPOffset).addReg(PPC::R1);
1676 BuildMI(MBB, MBBI, dl, TII.get(PPC::MTLR)).addReg(PPC::R0);
1679 // Callee pop calling convention. Pop parameter/linkage area. Used for tail
1680 // call optimization
1681 if (GuaranteedTailCallOpt && RetOpcode == PPC::BLR &&
1682 MF.getFunction()->getCallingConv() == CallingConv::Fast) {
1683 PPCFunctionInfo *FI = MF.getInfo<PPCFunctionInfo>();
1684 unsigned CallerAllocatedAmt = FI->getMinReservedArea();
1685 unsigned StackReg = isPPC64 ? PPC::X1 : PPC::R1;
1686 unsigned FPReg = isPPC64 ? PPC::X31 : PPC::R31;
1687 unsigned TmpReg = isPPC64 ? PPC::X0 : PPC::R0;
1688 unsigned ADDIInstr = isPPC64 ? PPC::ADDI8 : PPC::ADDI;
1689 unsigned ADDInstr = isPPC64 ? PPC::ADD8 : PPC::ADD4;
1690 unsigned LISInstr = isPPC64 ? PPC::LIS8 : PPC::LIS;
1691 unsigned ORIInstr = isPPC64 ? PPC::ORI8 : PPC::ORI;
1693 if (CallerAllocatedAmt && isInt<16>(CallerAllocatedAmt)) {
1694 BuildMI(MBB, MBBI, dl, TII.get(ADDIInstr), StackReg)
1695 .addReg(StackReg).addImm(CallerAllocatedAmt);
1697 BuildMI(MBB, MBBI, dl, TII.get(LISInstr), TmpReg)
1698 .addImm(CallerAllocatedAmt >> 16);
1699 BuildMI(MBB, MBBI, dl, TII.get(ORIInstr), TmpReg)
1700 .addReg(TmpReg, RegState::Kill)
1701 .addImm(CallerAllocatedAmt & 0xFFFF);
1702 BuildMI(MBB, MBBI, dl, TII.get(ADDInstr))
1707 } else if (RetOpcode == PPC::TCRETURNdi) {
1708 MBBI = prior(MBB.end());
1709 MachineOperand &JumpTarget = MBBI->getOperand(0);
1710 BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILB)).
1711 addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
1712 } else if (RetOpcode == PPC::TCRETURNri) {
1713 MBBI = prior(MBB.end());
1714 assert(MBBI->getOperand(0).isReg() && "Expecting register operand.");
1715 BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBCTR));
1716 } else if (RetOpcode == PPC::TCRETURNai) {
1717 MBBI = prior(MBB.end());
1718 MachineOperand &JumpTarget = MBBI->getOperand(0);
1719 BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBA)).addImm(JumpTarget.getImm());
1720 } else if (RetOpcode == PPC::TCRETURNdi8) {
1721 MBBI = prior(MBB.end());
1722 MachineOperand &JumpTarget = MBBI->getOperand(0);
1723 BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILB8)).
1724 addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
1725 } else if (RetOpcode == PPC::TCRETURNri8) {
1726 MBBI = prior(MBB.end());
1727 assert(MBBI->getOperand(0).isReg() && "Expecting register operand.");
1728 BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBCTR8));
1729 } else if (RetOpcode == PPC::TCRETURNai8) {
1730 MBBI = prior(MBB.end());
1731 MachineOperand &JumpTarget = MBBI->getOperand(0);
1732 BuildMI(MBB, MBBI, dl, TII.get(PPC::TAILBA8)).addImm(JumpTarget.getImm());
1736 unsigned PPCRegisterInfo::getRARegister() const {
1737 return !Subtarget.isPPC64() ? PPC::LR : PPC::LR8;
1740 unsigned PPCRegisterInfo::getFrameRegister(const MachineFunction &MF) const {
1741 if (!Subtarget.isPPC64())
1742 return hasFP(MF) ? PPC::R31 : PPC::R1;
1744 return hasFP(MF) ? PPC::X31 : PPC::X1;
1747 void PPCRegisterInfo::getInitialFrameState(std::vector<MachineMove> &Moves)
1749 // Initial state of the frame pointer is R1.
1750 MachineLocation Dst(MachineLocation::VirtualFP);
1751 MachineLocation Src(PPC::R1, 0);
1752 Moves.push_back(MachineMove(0, Dst, Src));
1755 unsigned PPCRegisterInfo::getEHExceptionRegister() const {
1756 return !Subtarget.isPPC64() ? PPC::R3 : PPC::X3;
1759 unsigned PPCRegisterInfo::getEHHandlerRegister() const {
1760 return !Subtarget.isPPC64() ? PPC::R4 : PPC::X4;
1763 int PPCRegisterInfo::getDwarfRegNum(unsigned RegNum, bool isEH) const {
1764 // FIXME: Most probably dwarf numbers differs for Linux and Darwin
1765 return PPCGenRegisterInfo::getDwarfRegNumFull(RegNum, 0);
1768 #include "PPCGenRegisterInfo.inc"