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 TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #ifndef X86SUBTARGET_H
15 #define X86SUBTARGET_H
17 #include "llvm/Target/TargetSubtarget.h"
24 /// PICStyles - The X86 backend supports a number of different styles of PIC.
28 StubPIC, // Used on i386-darwin in -fPIC mode.
29 StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode.
30 GOT, // Used on many 32-bit unices in -fPIC mode.
31 RIPRel, // Used on X86-64 when not in -static mode.
32 None // Set when in -static mode (not PIC or DynamicNoPIC mode).
36 class X86Subtarget : public TargetSubtarget {
39 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42
43 NoThreeDNow, ThreeDNow, ThreeDNowA
46 /// PICStyle - Which PIC style to use
48 PICStyles::Style PICStyle;
50 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or
52 X86SSEEnum X86SSELevel;
54 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
56 X863DNowEnum X863DNowLevel;
58 /// HasCMov - True if this processor has conditional move instructions
59 /// (generally pentium pro+).
62 /// HasX86_64 - True if the processor supports X86-64 instructions.
66 /// HasSSE4A - True if the processor supports SSE4A instructions.
69 /// HasAVX - Target has AVX instructions
72 /// HasFMA3 - Target has 3-operand fused multiply-add
75 /// HasFMA4 - Target has 4-operand fused multiply-add
78 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
81 /// BreakSSEDep - True if codegen should unfold load or insert xorps / pxor
82 /// to break register dependency for a partial register update SSE
83 /// instruction. This is needed for instructions such as CVTSS2SD which
84 /// only update the lower part of the register, and the result of the updated
85 /// part does not depend on the contents of the destination before the
86 /// instruction, and the non-updated portion of the register is not used.
89 /// DarwinVers - Nonzero if this is a darwin platform: the numeric
90 /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
91 unsigned char DarwinVers; // Is any darwin-x86 platform.
93 /// stackAlignment - The minimum alignment known to hold of the stack frame on
94 /// entry to the function and which must be maintained by every function.
95 unsigned stackAlignment;
97 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
99 unsigned MaxInlineSizeThreshold;
102 /// Is64Bit - True if the processor supports 64-bit instructions and
103 /// pointer size is 64 bit.
108 isELF, isCygwin, isDarwin, isWindows, isMingw
111 /// This constructor initializes the data members to match that
112 /// of the specified triple.
114 X86Subtarget(const std::string &TT, const std::string &FS, bool is64Bit);
116 /// getStackAlignment - Returns the minimum alignment known to hold of the
117 /// stack frame on entry to the function and which must be maintained by every
118 /// function for this subtarget.
119 unsigned getStackAlignment() const { return stackAlignment; }
121 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
122 /// that still makes it profitable to inline the call.
123 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
125 /// ParseSubtargetFeatures - Parses features string setting specified
126 /// subtarget options. Definition of function is auto generated by tblgen.
127 std::string ParseSubtargetFeatures(const std::string &FS,
128 const std::string &CPU);
130 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
132 void AutoDetectSubtargetFeatures();
134 bool is64Bit() const { return Is64Bit; }
136 PICStyles::Style getPICStyle() const { return PICStyle; }
137 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
139 bool hasMMX() const { return X86SSELevel >= MMX; }
140 bool hasSSE1() const { return X86SSELevel >= SSE1; }
141 bool hasSSE2() const { return X86SSELevel >= SSE2; }
142 bool hasSSE3() const { return X86SSELevel >= SSE3; }
143 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
144 bool hasSSE41() const { return X86SSELevel >= SSE41; }
145 bool hasSSE42() const { return X86SSELevel >= SSE42; }
146 bool hasSSE4A() const { return HasSSE4A; }
147 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
148 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
149 bool hasAVX() const { return HasAVX; }
150 bool hasFMA3() const { return HasFMA3; }
151 bool hasFMA4() const { return HasFMA4; }
152 bool isBTMemSlow() const { return IsBTMemSlow; }
153 bool shouldBreakSSEDep() const { return BreakSSEDep; }
155 bool isTargetDarwin() const { return TargetType == isDarwin; }
156 bool isTargetELF() const { return TargetType == isELF; }
158 bool isTargetWindows() const { return TargetType == isWindows; }
159 bool isTargetMingw() const { return TargetType == isMingw; }
160 bool isTargetCygwin() const { return TargetType == isCygwin; }
161 bool isTargetCygMing() const {
162 return TargetType == isMingw || TargetType == isCygwin;
165 /// isTargetCOFF - Return true if this is any COFF/Windows target variant.
166 bool isTargetCOFF() const {
167 return TargetType == isMingw || TargetType == isCygwin ||
168 TargetType == isWindows;
171 bool isTargetWin64() const {
172 return Is64Bit && (TargetType == isMingw || TargetType == isWindows);
175 std::string getDataLayout() const {
178 p = "e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-n8:16:32:64";
179 else if (isTargetDarwin())
180 p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-n8:16:32";
182 p = "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-n8:16:32";
183 return std::string(p);
186 bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
187 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
188 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
190 bool isPICStyleStubPIC() const {
191 return PICStyle == PICStyles::StubPIC;
194 bool isPICStyleStubNoDynamic() const {
195 return PICStyle == PICStyles::StubDynamicNoPIC;
197 bool isPICStyleStubAny() const {
198 return PICStyle == PICStyles::StubDynamicNoPIC ||
199 PICStyle == PICStyles::StubPIC; }
201 /// getDarwinVers - Return the darwin version number, 8 = Tiger, 9 = Leopard,
202 /// 10 = Snow Leopard, etc.
203 unsigned getDarwinVers() const { return DarwinVers; }
205 /// ClassifyGlobalReference - Classify a global variable reference for the
206 /// current subtarget according to how we should reference it in a non-pcrel
208 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
209 const TargetMachine &TM)const;
211 /// ClassifyBlockAddressReference - Classify a blockaddress reference for the
212 /// current subtarget according to how we should reference it in a non-pcrel
214 unsigned char ClassifyBlockAddressReference() const;
216 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
217 /// to immediate address.
218 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
220 /// This function returns the name of a function which has an interface
221 /// like the non-standard bzero function, if such a function exists on
222 /// the current subtarget and it is considered prefereable over
223 /// memset with zero passed as the second argument. Otherwise it
225 const char *getBZeroEntry() const;
227 /// getSpecialAddressLatency - For targets where it is beneficial to
228 /// backschedule instructions that compute addresses, return a value
229 /// indicating the number of scheduling cycles of backscheduling that
230 /// should be attempted.
231 unsigned getSpecialAddressLatency() const;
233 /// enablePostRAScheduler - X86 target is enabling post-alloc scheduling
234 /// at 'More' optimization level.
235 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
236 TargetSubtarget::AntiDepBreakMode& Mode,
237 RegClassVector& CriticalPathRCs) const;
240 } // End llvm namespace