1 //=====---- X86Subtarget.h - Define Subtarget for the X86 -----*- 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 declares the X86 specific subclass of TargetSubtargetInfo.
12 //===----------------------------------------------------------------------===//
14 #ifndef X86SUBTARGET_H
15 #define X86SUBTARGET_H
17 #include "llvm/ADT/Triple.h"
18 #include "llvm/Target/TargetSubtargetInfo.h"
19 #include "llvm/CallingConv.h"
22 #define GET_SUBTARGETINFO_HEADER
23 #include "X86GenSubtargetInfo.inc"
30 /// PICStyles - The X86 backend supports a number of different styles of PIC.
34 StubPIC, // Used on i386-darwin in -fPIC mode.
35 StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode.
36 GOT, // Used on many 32-bit unices in -fPIC mode.
37 RIPRel, // Used on X86-64 when not in -static mode.
38 None // Set when in -static mode (not PIC or DynamicNoPIC mode).
42 class X86Subtarget : public X86GenSubtargetInfo {
45 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, AVX, AVX2
49 NoThreeDNow, ThreeDNow, ThreeDNowA
52 /// PICStyle - Which PIC style to use
54 PICStyles::Style PICStyle;
56 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or
58 X86SSEEnum X86SSELevel;
60 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
62 X863DNowEnum X863DNowLevel;
64 /// HasCMov - True if this processor has conditional move instructions
65 /// (generally pentium pro+).
68 /// HasX86_64 - True if the processor supports X86-64 instructions.
72 /// HasPOPCNT - True if the processor supports POPCNT.
75 /// HasSSE4A - True if the processor supports SSE4A instructions.
78 /// HasAES - Target has AES instructions
81 /// HasCLMUL - Target has carry-less multiplication
84 /// HasFMA3 - Target has 3-operand fused multiply-add
87 /// HasFMA4 - Target has 4-operand fused multiply-add
90 /// HasXOP - Target has XOP instructions
93 /// HasMOVBE - True if the processor has the MOVBE instruction.
96 /// HasRDRAND - True if the processor has the RDRAND instruction.
99 /// HasF16C - Processor has 16-bit floating point conversion instructions.
102 /// HasFSGSBase - Processor has FS/GS base insturctions.
105 /// HasLZCNT - Processor has LZCNT instruction.
108 /// HasBMI - Processor has BMI1 instructions.
111 /// HasBMI2 - Processor has BMI2 instructions.
114 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
117 /// IsUAMemFast - True if unaligned memory access is fast.
120 /// HasVectorUAMem - True if SIMD operations can have unaligned memory
121 /// operands. This may require setting a feature bit in the processor.
124 /// HasCmpxchg16b - True if this processor has the CMPXCHG16B instruction;
125 /// this is true for most x86-64 chips, but not the first AMD chips.
128 /// stackAlignment - The minimum alignment known to hold of the stack frame on
129 /// entry to the function and which must be maintained by every function.
130 unsigned stackAlignment;
132 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
134 unsigned MaxInlineSizeThreshold;
136 /// TargetTriple - What processor and OS we're targeting.
140 /// In64BitMode - True if compiling for 64-bit, false for 32-bit.
145 /// This constructor initializes the data members to match that
146 /// of the specified triple.
148 X86Subtarget(const std::string &TT, const std::string &CPU,
149 const std::string &FS,
150 unsigned StackAlignOverride, bool is64Bit);
152 /// getStackAlignment - Returns the minimum alignment known to hold of the
153 /// stack frame on entry to the function and which must be maintained by every
154 /// function for this subtarget.
155 unsigned getStackAlignment() const { return stackAlignment; }
157 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
158 /// that still makes it profitable to inline the call.
159 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
161 /// ParseSubtargetFeatures - Parses features string setting specified
162 /// subtarget options. Definition of function is auto generated by tblgen.
163 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
165 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
167 void AutoDetectSubtargetFeatures();
169 bool is64Bit() const { return In64BitMode; }
171 PICStyles::Style getPICStyle() const { return PICStyle; }
172 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
174 bool hasCMov() const { return HasCMov; }
175 bool hasMMX() const { return X86SSELevel >= MMX; }
176 bool hasSSE1() const { return X86SSELevel >= SSE1; }
177 bool hasSSE2() const { return X86SSELevel >= SSE2; }
178 bool hasSSE3() const { return X86SSELevel >= SSE3; }
179 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
180 bool hasSSE41() const { return X86SSELevel >= SSE41; }
181 bool hasSSE42() const { return X86SSELevel >= SSE42; }
182 bool hasAVX() const { return X86SSELevel >= AVX; }
183 bool hasAVX2() const { return X86SSELevel >= AVX2; }
184 bool hasSSE4A() const { return HasSSE4A; }
185 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
186 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
187 bool hasPOPCNT() const { return HasPOPCNT; }
188 bool hasAES() const { return HasAES; }
189 bool hasCLMUL() const { return HasCLMUL; }
190 bool hasFMA3() const { return HasFMA3; }
191 bool hasFMA4() const { return HasFMA4; }
192 bool hasXOP() const { return HasXOP; }
193 bool hasMOVBE() const { return HasMOVBE; }
194 bool hasRDRAND() const { return HasRDRAND; }
195 bool hasF16C() const { return HasF16C; }
196 bool hasFSGSBase() const { return HasFSGSBase; }
197 bool hasLZCNT() const { return HasLZCNT; }
198 bool hasBMI() const { return HasBMI; }
199 bool hasBMI2() const { return HasBMI2; }
200 bool isBTMemSlow() const { return IsBTMemSlow; }
201 bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
202 bool hasVectorUAMem() const { return HasVectorUAMem; }
203 bool hasCmpxchg16b() const { return HasCmpxchg16b; }
205 const Triple &getTargetTriple() const { return TargetTriple; }
207 bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
208 bool isTargetFreeBSD() const {
209 return TargetTriple.getOS() == Triple::FreeBSD;
211 bool isTargetSolaris() const {
212 return TargetTriple.getOS() == Triple::Solaris;
215 // ELF is a reasonably sane default and the only other X86 targets we
216 // support are Darwin and Windows. Just use "not those".
217 bool isTargetELF() const {
218 return !isTargetDarwin() && !isTargetWindows() && !isTargetCygMing();
220 bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; }
221 bool isTargetNaCl() const {
222 return TargetTriple.getOS() == Triple::NativeClient;
224 bool isTargetNaCl32() const { return isTargetNaCl() && !is64Bit(); }
225 bool isTargetNaCl64() const { return isTargetNaCl() && is64Bit(); }
227 bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; }
228 bool isTargetMingw() const { return TargetTriple.getOS() == Triple::MinGW32; }
229 bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; }
230 bool isTargetCygMing() const {
231 return isTargetMingw() || isTargetCygwin();
234 /// isTargetCOFF - Return true if this is any COFF/Windows target variant.
235 bool isTargetCOFF() const {
236 return isTargetMingw() || isTargetCygwin() || isTargetWindows();
239 bool isTargetWin64() const {
240 // FIXME: x86_64-cygwin has not been released yet.
241 return In64BitMode && (isTargetCygMing() || isTargetWindows());
244 bool isTargetEnvMacho() const {
245 return isTargetDarwin() || (TargetTriple.getEnvironment() == Triple::MachO);
248 bool isTargetWin32() const {
249 return !In64BitMode && (isTargetMingw() || isTargetWindows());
252 bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
253 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
254 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
256 bool isPICStyleStubPIC() const {
257 return PICStyle == PICStyles::StubPIC;
260 bool isPICStyleStubNoDynamic() const {
261 return PICStyle == PICStyles::StubDynamicNoPIC;
263 bool isPICStyleStubAny() const {
264 return PICStyle == PICStyles::StubDynamicNoPIC ||
265 PICStyle == PICStyles::StubPIC; }
267 /// ClassifyGlobalReference - Classify a global variable reference for the
268 /// current subtarget according to how we should reference it in a non-pcrel
270 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
271 const TargetMachine &TM)const;
273 /// ClassifyBlockAddressReference - Classify a blockaddress reference for the
274 /// current subtarget according to how we should reference it in a non-pcrel
276 unsigned char ClassifyBlockAddressReference() const;
278 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
279 /// to immediate address.
280 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
282 /// This function returns the name of a function which has an interface
283 /// like the non-standard bzero function, if such a function exists on
284 /// the current subtarget and it is considered prefereable over
285 /// memset with zero passed as the second argument. Otherwise it
287 const char *getBZeroEntry() const;
289 /// getSpecialAddressLatency - For targets where it is beneficial to
290 /// backschedule instructions that compute addresses, return a value
291 /// indicating the number of scheduling cycles of backscheduling that
292 /// should be attempted.
293 unsigned getSpecialAddressLatency() const;
296 } // End llvm namespace