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
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 /// HasAVX - Target has AVX instructions
81 /// HasAES - Target has AES instructions
84 /// HasCLMUL - Target has carry-less multiplication
87 /// HasFMA3 - Target has 3-operand fused multiply-add
90 /// HasFMA4 - Target has 4-operand fused multiply-add
93 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
96 /// IsUAMemFast - True if unaligned memory access is fast.
99 /// HasVectorUAMem - True if SIMD operations can have unaligned memory
100 /// operands. This may require setting a feature bit in the processor.
103 /// HasCmpxchg16b - True if this processor has the CMPXCHG16B instruction;
104 /// this is true for most x86-64 chips, but not the first AMD chips.
107 /// stackAlignment - The minimum alignment known to hold of the stack frame on
108 /// entry to the function and which must be maintained by every function.
109 unsigned stackAlignment;
111 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
113 unsigned MaxInlineSizeThreshold;
115 /// TargetTriple - What processor and OS we're targeting.
119 /// In64BitMode - True if compiling for 64-bit, false for 32-bit.
122 /// InNaClMode - True if compiling for Native Client target.
127 /// This constructor initializes the data members to match that
128 /// of the specified triple.
130 X86Subtarget(const std::string &TT, const std::string &CPU,
131 const std::string &FS,
132 unsigned StackAlignOverride, bool is64Bit);
134 /// getStackAlignment - Returns the minimum alignment known to hold of the
135 /// stack frame on entry to the function and which must be maintained by every
136 /// function for this subtarget.
137 unsigned getStackAlignment() const { return stackAlignment; }
139 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
140 /// that still makes it profitable to inline the call.
141 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
143 /// ParseSubtargetFeatures - Parses features string setting specified
144 /// subtarget options. Definition of function is auto generated by tblgen.
145 void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
147 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
149 void AutoDetectSubtargetFeatures();
151 bool is64Bit() const { return In64BitMode; }
153 PICStyles::Style getPICStyle() const { return PICStyle; }
154 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
156 bool hasCMov() const { return HasCMov; }
157 bool hasMMX() const { return X86SSELevel >= MMX; }
158 bool hasSSE1() const { return X86SSELevel >= SSE1; }
159 bool hasSSE2() const { return X86SSELevel >= SSE2; }
160 bool hasSSE3() const { return X86SSELevel >= SSE3; }
161 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
162 bool hasSSE41() const { return X86SSELevel >= SSE41; }
163 bool hasSSE42() const { return X86SSELevel >= SSE42; }
164 bool hasSSE4A() const { return HasSSE4A; }
165 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
166 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
167 bool hasPOPCNT() const { return HasPOPCNT; }
168 bool hasAVX() const { return HasAVX; }
169 bool hasXMM() const { return hasSSE1() || hasAVX(); }
170 bool hasXMMInt() const { return hasSSE2() || hasAVX(); }
171 bool hasAES() const { return HasAES; }
172 bool hasCLMUL() const { return HasCLMUL; }
173 bool hasFMA3() const { return HasFMA3; }
174 bool hasFMA4() const { return HasFMA4; }
175 bool isBTMemSlow() const { return IsBTMemSlow; }
176 bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
177 bool hasVectorUAMem() const { return HasVectorUAMem; }
178 bool hasCmpxchg16b() const { return HasCmpxchg16b; }
180 const Triple &getTargetTriple() const { return TargetTriple; }
182 bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); }
183 bool isTargetFreeBSD() const {
184 return TargetTriple.getOS() == Triple::FreeBSD;
186 bool isTargetSolaris() const {
187 return TargetTriple.getOS() == Triple::Solaris;
190 // ELF is a reasonably sane default and the only other X86 targets we
191 // support are Darwin and Windows. Just use "not those".
192 bool isTargetELF() const {
193 return !isTargetDarwin() && !isTargetWindows() && !isTargetCygMing();
195 bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; }
196 bool isTargetNaCl() const {
197 return TargetTriple.getOS() == Triple::NativeClient;
199 bool isTargetNaCl32() const { return isTargetNaCl() && !is64Bit(); }
200 bool isTargetNaCl64() const { return isTargetNaCl() && is64Bit(); }
202 bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; }
203 bool isTargetMingw() const { return TargetTriple.getOS() == Triple::MinGW32; }
204 bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; }
205 bool isTargetCygMing() const {
206 return isTargetMingw() || isTargetCygwin();
209 /// isTargetCOFF - Return true if this is any COFF/Windows target variant.
210 bool isTargetCOFF() const {
211 return isTargetMingw() || isTargetCygwin() || isTargetWindows();
214 bool isTargetWin64() const {
215 // FIXME: x86_64-cygwin has not been released yet.
216 return In64BitMode && (isTargetCygMing() || isTargetWindows());
219 bool isTargetEnvMacho() const {
220 return isTargetDarwin() || (TargetTriple.getEnvironment() == Triple::MachO);
223 bool isTargetWin32() const {
224 return !In64BitMode && (isTargetMingw() || isTargetWindows());
227 bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
228 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
229 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
231 bool isPICStyleStubPIC() const {
232 return PICStyle == PICStyles::StubPIC;
235 bool isPICStyleStubNoDynamic() const {
236 return PICStyle == PICStyles::StubDynamicNoPIC;
238 bool isPICStyleStubAny() const {
239 return PICStyle == PICStyles::StubDynamicNoPIC ||
240 PICStyle == PICStyles::StubPIC; }
242 /// ClassifyGlobalReference - Classify a global variable reference for the
243 /// current subtarget according to how we should reference it in a non-pcrel
245 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
246 const TargetMachine &TM)const;
248 /// ClassifyBlockAddressReference - Classify a blockaddress reference for the
249 /// current subtarget according to how we should reference it in a non-pcrel
251 unsigned char ClassifyBlockAddressReference() const;
253 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
254 /// to immediate address.
255 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
257 /// This function returns the name of a function which has an interface
258 /// like the non-standard bzero function, if such a function exists on
259 /// the current subtarget and it is considered prefereable over
260 /// memset with zero passed as the second argument. Otherwise it
262 const char *getBZeroEntry() const;
264 /// getSpecialAddressLatency - For targets where it is beneficial to
265 /// backschedule instructions that compute addresses, return a value
266 /// indicating the number of scheduling cycles of backscheduling that
267 /// should be attempted.
268 unsigned getSpecialAddressLatency() const;
271 } // End llvm namespace