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/Target/TargetSubtarget.h"
24 /// PICStyles - The X86 backend supports a number of different styles of PIC.
28 StubPIC, // Used on i386-darwin in -fPIC mode.
29 StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode.
30 GOT, // Used on many 32-bit unices in -fPIC mode.
31 RIPRel, // Used on X86-64 when not in -static mode.
32 None // Set when in -static mode (not PIC or DynamicNoPIC mode).
36 class X86Subtarget : public TargetSubtarget {
39 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42
43 NoThreeDNow, ThreeDNow, ThreeDNowA
46 /// PICStyle - Which PIC style to use
48 PICStyles::Style PICStyle;
50 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or
52 X86SSEEnum X86SSELevel;
54 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
56 X863DNowEnum X863DNowLevel;
58 /// HasCMov - True if this processor has conditional move instructions
59 /// (generally pentium pro+).
62 /// HasX86_64 - True if the processor supports X86-64 instructions.
66 /// HasSSE4A - True if the processor supports SSE4A instructions.
69 /// HasAVX - Target has AVX instructions
72 /// HasFMA3 - Target has 3-operand fused multiply-add
75 /// HasFMA4 - Target has 4-operand fused multiply-add
78 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
81 /// DarwinVers - Nonzero if this is a darwin platform: the numeric
82 /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
83 unsigned char DarwinVers; // Is any darwin-x86 platform.
85 /// stackAlignment - The minimum alignment known to hold of the stack frame on
86 /// entry to the function and which must be maintained by every function.
87 unsigned stackAlignment;
89 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
91 unsigned MaxInlineSizeThreshold;
94 /// Is64Bit - True if the processor supports 64-bit instructions and
95 /// pointer size is 64 bit.
100 isELF, isCygwin, isDarwin, isWindows, isMingw
103 /// This constructor initializes the data members to match that
104 /// of the specified triple.
106 X86Subtarget(const std::string &TT, const std::string &FS, bool is64Bit);
108 /// getStackAlignment - Returns the minimum alignment known to hold of the
109 /// stack frame on entry to the function and which must be maintained by every
110 /// function for this subtarget.
111 unsigned getStackAlignment() const { return stackAlignment; }
113 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
114 /// that still makes it profitable to inline the call.
115 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
117 /// ParseSubtargetFeatures - Parses features string setting specified
118 /// subtarget options. Definition of function is auto generated by tblgen.
119 std::string ParseSubtargetFeatures(const std::string &FS,
120 const std::string &CPU);
122 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
124 void AutoDetectSubtargetFeatures();
126 bool is64Bit() const { return Is64Bit; }
128 PICStyles::Style getPICStyle() const { return PICStyle; }
129 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
131 bool hasMMX() const { return X86SSELevel >= MMX; }
132 bool hasSSE1() const { return X86SSELevel >= SSE1; }
133 bool hasSSE2() const { return X86SSELevel >= SSE2; }
134 bool hasSSE3() const { return X86SSELevel >= SSE3; }
135 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
136 bool hasSSE41() const { return X86SSELevel >= SSE41; }
137 bool hasSSE42() const { return X86SSELevel >= SSE42; }
138 bool hasSSE4A() const { return HasSSE4A; }
139 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
140 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
141 bool hasAVX() const { return HasAVX; }
142 bool hasFMA3() const { return HasFMA3; }
143 bool hasFMA4() const { return HasFMA4; }
144 bool isBTMemSlow() const { return IsBTMemSlow; }
146 bool isTargetDarwin() const { return TargetType == isDarwin; }
147 bool isTargetELF() const { return TargetType == isELF; }
149 bool isTargetWindows() const { return TargetType == isWindows; }
150 bool isTargetMingw() const { return TargetType == isMingw; }
151 bool isTargetCygwin() const { return TargetType == isCygwin; }
152 bool isTargetCygMing() const {
153 return TargetType == isMingw || TargetType == isCygwin;
156 /// isTargetCOFF - Return true if this is any COFF/Windows target variant.
157 bool isTargetCOFF() const {
158 return TargetType == isMingw || TargetType == isCygwin ||
159 TargetType == isWindows;
162 bool isTargetWin64() const {
163 return Is64Bit && (TargetType == isMingw || TargetType == isWindows);
166 std::string getDataLayout() const {
169 p = "e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-n8:16:32:64";
170 else if (isTargetDarwin())
171 p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-n8:16:32";
173 p = "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-n8:16:32";
174 return std::string(p);
177 bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
178 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
179 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
181 bool isPICStyleStubPIC() const {
182 return PICStyle == PICStyles::StubPIC;
185 bool isPICStyleStubNoDynamic() const {
186 return PICStyle == PICStyles::StubDynamicNoPIC;
188 bool isPICStyleStubAny() const {
189 return PICStyle == PICStyles::StubDynamicNoPIC ||
190 PICStyle == PICStyles::StubPIC; }
192 /// getDarwinVers - Return the darwin version number, 8 = Tiger, 9 = Leopard,
193 /// 10 = Snow Leopard, etc.
194 unsigned getDarwinVers() const { return DarwinVers; }
196 /// ClassifyGlobalReference - Classify a global variable reference for the
197 /// current subtarget according to how we should reference it in a non-pcrel
199 unsigned char ClassifyGlobalReference(const GlobalValue *GV,
200 const TargetMachine &TM)const;
202 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
203 /// to immediate address.
204 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
206 /// This function returns the name of a function which has an interface
207 /// like the non-standard bzero function, if such a function exists on
208 /// the current subtarget and it is considered prefereable over
209 /// memset with zero passed as the second argument. Otherwise it
211 const char *getBZeroEntry() const;
213 /// getSpecialAddressLatency - For targets where it is beneficial to
214 /// backschedule instructions that compute addresses, return a value
215 /// indicating the number of scheduling cycles of backscheduling that
216 /// should be attempted.
217 unsigned getSpecialAddressLatency() const;
219 /// enablePostRAScheduler - X86 target is enabling post-alloc scheduling
220 /// at 'More' optimization level.
221 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
222 TargetSubtarget::AntiDepBreakMode& Mode,
223 ExcludedRCVector& ExcludedRCs) const;
226 } // End llvm namespace