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 /// HasSSE4A - True if the processor supports SSE4A instructions.
71 /// HasAVX - Target has AVX instructions
74 /// HasAES - Target has AES instructions
77 /// HasCLMUL - Target has carry-less multiplication
80 /// HasFMA3 - Target has 3-operand fused multiply-add
83 /// HasFMA4 - Target has 4-operand fused multiply-add
86 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
89 /// IsUAMemFast - True if unaligned memory access is fast.
92 /// HasVectorUAMem - True if SIMD operations can have unaligned memory
93 /// operands. This may require setting a feature bit in the processor.
96 /// stackAlignment - The minimum alignment known to hold of the stack frame on
97 /// entry to the function and which must be maintained by every function.
98 unsigned stackAlignment;
100 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
102 unsigned MaxInlineSizeThreshold;
104 /// TargetTriple - What processor and OS we're targeting.
108 /// Is64Bit - True if the processor supports 64-bit instructions and
109 /// pointer size is 64 bit.
114 /// This constructor initializes the data members to match that
115 /// of the specified triple.
117 X86Subtarget(const std::string &TT, const std::string &FS, bool is64Bit);
119 /// getStackAlignment - Returns the minimum alignment known to hold of the
120 /// stack frame on entry to the function and which must be maintained by every
121 /// function for this subtarget.
122 unsigned getStackAlignment() const { return stackAlignment; }
124 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
125 /// that still makes it profitable to inline the call.
126 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
128 /// ParseSubtargetFeatures - Parses features string setting specified
129 /// subtarget options. Definition of function is auto generated by tblgen.
130 std::string ParseSubtargetFeatures(const std::string &FS,
131 const std::string &CPU);
133 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
135 void AutoDetectSubtargetFeatures();
137 bool is64Bit() const { return Is64Bit; }
139 PICStyles::Style getPICStyle() const { return PICStyle; }
140 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
142 bool hasCMov() const { return HasCMov; }
143 bool hasMMX() const { return X86SSELevel >= MMX; }
144 bool hasSSE1() const { return X86SSELevel >= SSE1; }
145 bool hasSSE2() const { return X86SSELevel >= SSE2; }
146 bool hasSSE3() const { return X86SSELevel >= SSE3; }
147 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
148 bool hasSSE41() const { return X86SSELevel >= SSE41; }
149 bool hasSSE42() const { return X86SSELevel >= SSE42; }
150 bool hasSSE4A() const { return HasSSE4A; }
151 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
152 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
153 bool hasAVX() const { return HasAVX; }
154 bool hasAES() const { return HasAES; }
155 bool hasCLMUL() const { return HasCLMUL; }
156 bool hasFMA3() const { return HasFMA3; }
157 bool hasFMA4() const { return HasFMA4; }
158 bool isBTMemSlow() const { return IsBTMemSlow; }
159 bool isUnalignedMemAccessFast() const { return IsUAMemFast; }
160 bool hasVectorUAMem() const { return HasVectorUAMem; }
162 bool isTargetDarwin() const { return TargetTriple.getOS() == Triple::Darwin; }
164 // ELF is a reasonably sane default and the only other X86 targets we
165 // support are Darwin and Windows. Just use "not those".
166 bool isTargetELF() const {
167 return !isTargetDarwin() && !isTargetWindows() && !isTargetCygMing();
169 bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; }
171 bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; }
172 bool isTargetMingw() const {
173 return TargetTriple.getOS() == Triple::MinGW32 ||
174 TargetTriple.getOS() == Triple::MinGW64; }
175 bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; }
176 bool isTargetCygMing() const {
177 return isTargetMingw() || isTargetCygwin();
180 /// isTargetCOFF - Return true if this is any COFF/Windows target variant.
181 bool isTargetCOFF() const {
182 return isTargetMingw() || isTargetCygwin() || isTargetWindows();
185 bool isTargetWin64() const {
186 return Is64Bit && (isTargetMingw() || isTargetWindows());
189 bool isTargetWin32() const {
190 return !Is64Bit && (isTargetMingw() || isTargetWindows());
193 std::string getDataLayout() const {
196 p = "e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-n8:16:32:64";
197 else if (isTargetDarwin())
198 p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-n8:16:32";
199 else if (isTargetMingw() || isTargetWindows())
200 p = "e-p:32:32-f64:64:64-i64:64:64-f80:32:32-n8:16:32";
202 p = "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-n8:16:32";
204 return std::string(p);
207 bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
208 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
209 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
211 bool isPICStyleStubPIC() const {
212 return PICStyle == PICStyles::StubPIC;
215 bool isPICStyleStubNoDynamic() const {
216 return PICStyle == PICStyles::StubDynamicNoPIC;
218 bool isPICStyleStubAny() const {
219 return PICStyle == PICStyles::StubDynamicNoPIC ||
220 PICStyle == PICStyles::StubPIC; }
222 /// getDarwinVers - Return the darwin version number, 8 = Tiger, 9 = Leopard,
223 /// 10 = Snow Leopard, etc.
224 unsigned getDarwinVers() const {
225 if (isTargetDarwin()) return TargetTriple.getDarwinMajorNumber();
229 /// ClassifyGlobalReference - Classify a global variable reference for the
230 /// current subtarget according to how we should reference it in a non-pcrel
232 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
233 const TargetMachine &TM)const;
235 /// ClassifyBlockAddressReference - Classify a blockaddress reference for the
236 /// current subtarget according to how we should reference it in a non-pcrel
238 unsigned char ClassifyBlockAddressReference() const;
240 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
241 /// to immediate address.
242 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
244 /// This function returns the name of a function which has an interface
245 /// like the non-standard bzero function, if such a function exists on
246 /// the current subtarget and it is considered prefereable over
247 /// memset with zero passed as the second argument. Otherwise it
249 const char *getBZeroEntry() const;
251 /// getSpecialAddressLatency - For targets where it is beneficial to
252 /// backschedule instructions that compute addresses, return a value
253 /// indicating the number of scheduling cycles of backscheduling that
254 /// should be attempted.
255 unsigned getSpecialAddressLatency() const;
257 /// IsCalleePop - Test whether a function should pop its own arguments.
258 bool IsCalleePop(bool isVarArg, CallingConv::ID CallConv) const;
261 } // End llvm namespace