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 hasAES() const { return HasAES; }
159 bool hasCLMUL() const { return HasCLMUL; }
160 bool hasFMA3() const { return HasFMA3; }
161 bool hasFMA4() const { return HasFMA4; }
162 bool isBTMemSlow() const { return IsBTMemSlow; }
163 bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
164 bool hasVectorUAMem() const { return HasVectorUAMem; }
166 bool isTargetDarwin() const { return TargetTriple.getOS() == Triple::Darwin; }
168 // ELF is a reasonably sane default and the only other X86 targets we
169 // support are Darwin and Windows. Just use "not those".
170 bool isTargetELF() const {
171 return !isTargetDarwin() && !isTargetWindows() && !isTargetCygMing();
173 bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; }
175 bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; }
176 bool isTargetMingw() const {
177 return TargetTriple.getOS() == Triple::MinGW32 ||
178 TargetTriple.getOS() == Triple::MinGW64; }
179 bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; }
180 bool isTargetCygMing() const {
181 return isTargetMingw() || isTargetCygwin();
184 /// isTargetCOFF - Return true if this is any COFF/Windows target variant.
185 bool isTargetCOFF() const {
186 return isTargetMingw() || isTargetCygwin() || isTargetWindows();
189 bool isTargetWin64() const {
190 return Is64Bit && (isTargetMingw() || isTargetWindows());
193 bool isTargetWin32() const {
194 return !Is64Bit && (isTargetMingw() || isTargetWindows());
197 bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
198 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
199 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
201 bool isPICStyleStubPIC() const {
202 return PICStyle == PICStyles::StubPIC;
205 bool isPICStyleStubNoDynamic() const {
206 return PICStyle == PICStyles::StubDynamicNoPIC;
208 bool isPICStyleStubAny() const {
209 return PICStyle == PICStyles::StubDynamicNoPIC ||
210 PICStyle == PICStyles::StubPIC; }
212 /// getDarwinVers - Return the darwin version number, 8 = Tiger, 9 = Leopard,
213 /// 10 = Snow Leopard, etc.
214 unsigned getDarwinVers() const {
215 if (isTargetDarwin()) return TargetTriple.getDarwinMajorNumber();
219 /// ClassifyGlobalReference - Classify a global variable reference for the
220 /// current subtarget according to how we should reference it in a non-pcrel
222 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
223 const TargetMachine &TM)const;
225 /// ClassifyBlockAddressReference - Classify a blockaddress reference for the
226 /// current subtarget according to how we should reference it in a non-pcrel
228 unsigned char ClassifyBlockAddressReference() const;
230 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
231 /// to immediate address.
232 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
234 /// This function returns the name of a function which has an interface
235 /// like the non-standard bzero function, if such a function exists on
236 /// the current subtarget and it is considered prefereable over
237 /// memset with zero passed as the second argument. Otherwise it
239 const char *getBZeroEntry() const;
241 /// getSpecialAddressLatency - For targets where it is beneficial to
242 /// backschedule instructions that compute addresses, return a value
243 /// indicating the number of scheduling cycles of backscheduling that
244 /// should be attempted.
245 unsigned getSpecialAddressLatency() const;
247 /// IsCalleePop - Test whether a function should pop its own arguments.
248 bool IsCalleePop(bool isVarArg, CallingConv::ID CallConv) const;
251 } // End llvm namespace