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"
29 /// PICStyles - The X86 backend supports a number of different styles of PIC.
33 StubPIC, // Used on i386-darwin in -fPIC mode.
34 StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode.
35 GOT, // Used on many 32-bit unices in -fPIC mode.
36 RIPRel, // Used on X86-64 when not in -static mode.
37 None // Set when in -static mode (not PIC or DynamicNoPIC mode).
41 class X86Subtarget : public X86GenSubtargetInfo {
44 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42
48 NoThreeDNow, ThreeDNow, ThreeDNowA
51 /// PICStyle - Which PIC style to use
53 PICStyles::Style PICStyle;
55 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or
57 X86SSEEnum X86SSELevel;
59 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
61 X863DNowEnum X863DNowLevel;
63 /// HasCMov - True if this processor has conditional move instructions
64 /// (generally pentium pro+).
67 /// HasX86_64 - True if the processor supports X86-64 instructions.
71 /// HasPOPCNT - True if the processor supports POPCNT.
74 /// HasSSE4A - True if the processor supports SSE4A instructions.
77 /// HasAVX - Target has AVX instructions
80 /// HasAES - Target has AES instructions
83 /// HasCLMUL - Target has carry-less multiplication
86 /// HasFMA3 - Target has 3-operand fused multiply-add
89 /// HasFMA4 - Target has 4-operand fused multiply-add
92 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
95 /// IsUAMemFast - True if unaligned memory access is fast.
98 /// HasVectorUAMem - True if SIMD operations can have unaligned memory
99 /// operands. This may require setting a feature bit in the processor.
102 /// stackAlignment - The minimum alignment known to hold of the stack frame on
103 /// entry to the function and which must be maintained by every function.
104 unsigned stackAlignment;
106 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
108 unsigned MaxInlineSizeThreshold;
110 /// TargetTriple - What processor and OS we're targeting.
114 /// Is64Bit - True if the processor supports 64-bit instructions and
115 /// pointer size is 64 bit.
120 /// This constructor initializes the data members to match that
121 /// of the specified triple.
123 X86Subtarget(const std::string &TT, const std::string &CPU,
124 const std::string &FS, bool is64Bit,
125 unsigned StackAlignOverride);
127 /// getStackAlignment - Returns the minimum alignment known to hold of the
128 /// stack frame on entry to the function and which must be maintained by every
129 /// function for this subtarget.
130 unsigned getStackAlignment() const { return stackAlignment; }
132 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
133 /// that still makes it profitable to inline the call.
134 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
136 /// ParseSubtargetFeatures - Parses features string setting specified
137 /// subtarget options. Definition of function is auto generated by tblgen.
138 void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
140 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
142 void AutoDetectSubtargetFeatures();
144 bool is64Bit() const { return Is64Bit; }
146 PICStyles::Style getPICStyle() const { return PICStyle; }
147 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
149 bool hasCMov() const { return HasCMov; }
150 bool hasMMX() const { return X86SSELevel >= MMX; }
151 bool hasSSE1() const { return X86SSELevel >= SSE1; }
152 bool hasSSE2() const { return X86SSELevel >= SSE2; }
153 bool hasSSE3() const { return X86SSELevel >= SSE3; }
154 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
155 bool hasSSE41() const { return X86SSELevel >= SSE41; }
156 bool hasSSE42() const { return X86SSELevel >= SSE42; }
157 bool hasSSE4A() const { return HasSSE4A; }
158 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
159 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
160 bool hasPOPCNT() const { return HasPOPCNT; }
161 bool hasAVX() const { return HasAVX; }
162 bool hasXMM() const { return hasSSE1() || hasAVX(); }
163 bool hasXMMInt() const { return hasSSE2() || hasAVX(); }
164 bool hasAES() const { return HasAES; }
165 bool hasCLMUL() const { return HasCLMUL; }
166 bool hasFMA3() const { return HasFMA3; }
167 bool hasFMA4() const { return HasFMA4; }
168 bool isBTMemSlow() const { return IsBTMemSlow; }
169 bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
170 bool hasVectorUAMem() const { return HasVectorUAMem; }
172 const Triple &getTargetTriple() const { return TargetTriple; }
174 bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
175 bool isTargetFreeBSD() const {
176 return TargetTriple.getOS() == Triple::FreeBSD;
178 bool isTargetSolaris() const {
179 return TargetTriple.getOS() == Triple::Solaris;
182 // ELF is a reasonably sane default and the only other X86 targets we
183 // support are Darwin and Windows. Just use "not those".
184 bool isTargetELF() const {
185 return !isTargetDarwin() && !isTargetWindows() && !isTargetCygMing();
187 bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; }
189 bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; }
190 bool isTargetMingw() const { return TargetTriple.getOS() == Triple::MinGW32; }
191 bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; }
192 bool isTargetCygMing() const {
193 return isTargetMingw() || isTargetCygwin();
196 /// isTargetCOFF - Return true if this is any COFF/Windows target variant.
197 bool isTargetCOFF() const {
198 return isTargetMingw() || isTargetCygwin() || isTargetWindows();
201 bool isTargetWin64() const {
202 return Is64Bit && (isTargetMingw() || isTargetWindows());
205 bool isTargetEnvMacho() const {
206 return isTargetDarwin() || (TargetTriple.getEnvironment() == Triple::MachO);
209 bool isTargetWin32() const {
210 return !Is64Bit && (isTargetMingw() || isTargetWindows());
213 bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
214 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
215 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
217 bool isPICStyleStubPIC() const {
218 return PICStyle == PICStyles::StubPIC;
221 bool isPICStyleStubNoDynamic() const {
222 return PICStyle == PICStyles::StubDynamicNoPIC;
224 bool isPICStyleStubAny() const {
225 return PICStyle == PICStyles::StubDynamicNoPIC ||
226 PICStyle == PICStyles::StubPIC; }
228 /// ClassifyGlobalReference - Classify a global variable reference for the
229 /// current subtarget according to how we should reference it in a non-pcrel
231 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
232 const TargetMachine &TM)const;
234 /// ClassifyBlockAddressReference - Classify a blockaddress reference for the
235 /// current subtarget according to how we should reference it in a non-pcrel
237 unsigned char ClassifyBlockAddressReference() const;
239 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
240 /// to immediate address.
241 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
243 /// This function returns the name of a function which has an interface
244 /// like the non-standard bzero function, if such a function exists on
245 /// the current subtarget and it is considered prefereable over
246 /// memset with zero passed as the second argument. Otherwise it
248 const char *getBZeroEntry() const;
250 /// getSpecialAddressLatency - For targets where it is beneficial to
251 /// backschedule instructions that compute addresses, return a value
252 /// indicating the number of scheduling cycles of backscheduling that
253 /// should be attempted.
254 unsigned getSpecialAddressLatency() const;
257 } // End llvm namespace