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18a8452f3d
Turns them into calls to memset / memcpy if 1) buffer(s) are not DWORD aligned, 2) size is not known to be greater or equal to some minimum value (currently 128). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26224 91177308-0d34-0410-b5e6-96231b3b80d8
97 lines
3.1 KiB
C++
97 lines
3.1 KiB
C++
//=====---- X86Subtarget.h - Define Subtarget for the X86 -----*- C++ -*--====//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Nate Begeman and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares the X86 specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#ifndef X86SUBTARGET_H
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#define X86SUBTARGET_H
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#include "llvm/Target/TargetSubtarget.h"
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#include <string>
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namespace llvm {
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class Module;
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class X86Subtarget : public TargetSubtarget {
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protected:
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enum X86SSEEnum {
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NoMMXSSE, MMX, SSE1, SSE2, SSE3
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};
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enum X863DNowEnum {
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NoThreeDNow, ThreeDNow, ThreeDNowA
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};
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/// X86SSELevel - MMX, SSE1, SSE2, SSE3, or none supported.
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X86SSEEnum X86SSELevel;
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/// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
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X863DNowEnum X863DNowLevel;
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/// Is64Bit - True if the processor supports Em64T.
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bool Is64Bit;
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/// stackAlignment - The minimum alignment known to hold of the stack frame on
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/// entry to the function and which must be maintained by every function.
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unsigned stackAlignment;
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/// Min. memset / memcpy size that is turned into rep/movs, rep/stos ops.
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unsigned MinRepStrSizeThreshold;
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/// Used by instruction selector
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bool indirectExternAndWeakGlobals;
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public:
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enum {
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isELF, isCygwin, isDarwin, isWindows
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} TargetType;
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/// This constructor initializes the data members to match that
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/// of the specified module.
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///
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X86Subtarget(const Module &M, const std::string &FS);
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/// getStackAlignment - Returns the minimum alignment known to hold of the
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/// stack frame on entry to the function and which must be maintained by every
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/// function for this subtarget.
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unsigned getStackAlignment() const { return stackAlignment; }
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/// getMinRepStrSizeThreshold - Returns the minimum memset / memcpy size
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/// required to turn the operation into a X86 rep/movs or rep/stos
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/// instruction. This is only used if the src / dst alignment is not DWORD
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/// aligned.
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unsigned getMinRepStrSizeThreshold() const { return MinRepStrSizeThreshold; }
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/// Returns true if the instruction selector should treat global values
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/// referencing external or weak symbols as indirect rather than direct
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/// references.
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bool getIndirectExternAndWeakGlobals() const {
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return indirectExternAndWeakGlobals;
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}
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/// ParseSubtargetFeatures - Parses features string setting specified
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/// subtarget options. Definition of function is auto generated by tblgen.
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void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
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bool is64Bit() const { return Is64Bit; }
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bool hasMMX() const { return X86SSELevel >= MMX; }
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bool hasSSE1() const { return X86SSELevel >= SSE1; }
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bool hasSSE2() const { return X86SSELevel >= SSE2; }
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bool hasSSE3() const { return X86SSELevel >= SSE3; }
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bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
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bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
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};
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} // End llvm namespace
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#endif
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