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