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"
27 Stub, GOT, RIPRel, WinPIC, None
31 class X86Subtarget : public TargetSubtarget {
33 enum AsmWriterFlavorTy {
34 // Note: This numbering has to match the GCC assembler dialects for inline
35 // asm alternatives to work right.
36 ATT = 0, Intel = 1, Unset
40 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42
44 NoThreeDNow, ThreeDNow, ThreeDNowA
47 /// AsmFlavor - Which x86 asm dialect to use.
49 AsmWriterFlavorTy AsmFlavor;
51 /// PICStyle - Which PIC style to use
53 PICStyles::Style PICStyle;
55 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or
57 X86SSEEnum X86SSELevel;
59 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
61 X863DNowEnum X863DNowLevel;
63 /// HasX86_64 - True if the processor supports X86-64 instructions.
67 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow.
70 /// HasSSE4A - True if the processor supports SSE4A instructions.
73 /// DarwinVers - Nonzero if this is a darwin platform: the numeric
74 /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
75 unsigned char DarwinVers; // Is any darwin-x86 platform.
77 /// isLinux - true if this is a "linux" platform.
80 /// stackAlignment - The minimum alignment known to hold of the stack frame on
81 /// entry to the function and which must be maintained by every function.
82 unsigned stackAlignment;
84 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
86 unsigned MaxInlineSizeThreshold;
89 /// Is64Bit - True if the processor supports 64-bit instructions and module
90 /// pointer size is 64 bit.
95 isELF, isCygwin, isDarwin, isWindows, isMingw
98 /// This constructor initializes the data members to match that
99 /// of the specified module.
101 X86Subtarget(const Module &M, const std::string &FS, bool is64Bit);
103 /// getStackAlignment - Returns the minimum alignment known to hold of the
104 /// stack frame on entry to the function and which must be maintained by every
105 /// function for this subtarget.
106 unsigned getStackAlignment() const { return stackAlignment; }
108 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
109 /// that still makes it profitable to inline the call.
110 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
112 /// ParseSubtargetFeatures - Parses features string setting specified
113 /// subtarget options. Definition of function is auto generated by tblgen.
114 std::string ParseSubtargetFeatures(const std::string &FS,
115 const std::string &CPU);
117 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
119 void AutoDetectSubtargetFeatures();
121 bool is64Bit() const { return Is64Bit; }
123 PICStyles::Style getPICStyle() const { return PICStyle; }
124 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; }
126 bool hasMMX() const { return X86SSELevel >= MMX; }
127 bool hasSSE1() const { return X86SSELevel >= SSE1; }
128 bool hasSSE2() const { return X86SSELevel >= SSE2; }
129 bool hasSSE3() const { return X86SSELevel >= SSE3; }
130 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
131 bool hasSSE41() const { return X86SSELevel >= SSE41; }
132 bool hasSSE42() const { return X86SSELevel >= SSE42; }
133 bool hasSSE4A() const { return HasSSE4A; }
134 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
135 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
137 bool isBTMemSlow() const { return IsBTMemSlow; }
139 unsigned getAsmFlavor() const {
140 return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
143 bool isFlavorAtt() const { return AsmFlavor == ATT; }
144 bool isFlavorIntel() const { return AsmFlavor == Intel; }
146 bool isTargetDarwin() const { return TargetType == isDarwin; }
147 bool isTargetELF() const {
148 return TargetType == isELF;
150 bool isTargetWindows() const { return TargetType == isWindows; }
151 bool isTargetMingw() const { return TargetType == isMingw; }
152 bool isTargetCygMing() const { return (TargetType == isMingw ||
153 TargetType == isCygwin); }
154 bool isTargetCygwin() const { return TargetType == isCygwin; }
155 bool isTargetWin64() const {
156 return (Is64Bit && (TargetType == isMingw || TargetType == isWindows));
159 std::string getDataLayout() const {
162 p = "e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128";
164 if (isTargetDarwin())
165 p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128";
167 p = "e-p:32:32-f64:32:64-i64:32:64-f80:32:32";
169 return std::string(p);
172 bool isPICStyleSet() const { return PICStyle != PICStyles::None; }
173 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; }
174 bool isPICStyleStub() const { return PICStyle == PICStyles::Stub; }
175 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; }
176 bool isPICStyleWinPIC() const { return PICStyle == PICStyles:: WinPIC; }
178 /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
179 unsigned getDarwinVers() const { return DarwinVers; }
181 /// isLinux - Return true if the target is "Linux".
182 bool isLinux() const { return IsLinux; }
184 /// True if accessing the GV requires an extra load. For Windows, dllimported
185 /// symbols are indirect, loading the value at address GV rather then the
186 /// value of GV itself. This means that the GlobalAddress must be in the base
187 /// or index register of the address, not the GV offset field.
188 bool GVRequiresExtraLoad(const GlobalValue* GV, const TargetMachine& TM,
189 bool isDirectCall) const;
191 /// True if accessing the GV requires a register. This is a superset of the
192 /// cases where GVRequiresExtraLoad is true. Some variations of PIC require
193 /// a register, but not an extra load.
194 bool GVRequiresRegister(const GlobalValue* GV, const TargetMachine& TM,
195 bool isDirectCall) const;
197 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls
198 /// to immediate address.
199 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const;
201 /// This function returns the name of a function which has an interface
202 /// like the non-standard bzero function, if such a function exists on
203 /// the current subtarget and it is considered prefereable over
204 /// memset with zero passed as the second argument. Otherwise it
206 const char *getBZeroEntry() const;
208 /// getSpecialAddressLatency - For targets where it is beneficial to
209 /// backschedule instructions that compute addresses, return a value
210 /// indicating the number of scheduling cycles of backscheduling that
211 /// should be attempted.
212 unsigned getSpecialAddressLatency() const;
216 /// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in
217 /// the specified arguments. If we can't run cpuid on the host, return true.
218 bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX,
219 unsigned *rECX, unsigned *rEDX);
222 } // End llvm namespace