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annotate lib/CodeGen/TargetOptionsImpl.cpp @ 134:3a76565eade5 LLVM5.0.1

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update 5.0.1
author mir3636
date Sat, 17 Feb 2018 09:57:20 +0900
parents 803732b1fca8
children c2174574ed3a
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1 //===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the methods in the TargetOptions.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #include "llvm/CodeGen/MachineFrameInfo.h"
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15 #include "llvm/CodeGen/MachineFunction.h"
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16 #include "llvm/CodeGen/TargetFrameLowering.h"
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17 #include "llvm/CodeGen/TargetSubtargetInfo.h"
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18 #include "llvm/IR/Function.h"
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19 #include "llvm/IR/Module.h"
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20 #include "llvm/Target/TargetOptions.h"
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21 using namespace llvm;
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23 /// DisableFramePointerElim - This returns true if frame pointer elimination
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24 /// optimization should be disabled for the given machine function.
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25 bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
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26 // Check to see if we should eliminate all frame pointers.
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27 if (MF.getSubtarget().getFrameLowering()->noFramePointerElim(MF))
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28 return true;
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30 // Check to see if we should eliminate non-leaf frame pointers.
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31 if (MF.getFunction().hasFnAttribute("no-frame-pointer-elim-non-leaf"))
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32 return MF.getFrameInfo().hasCalls();
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34 return false;
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35 }
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37 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
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38 /// that the rounding mode of the FPU can change from its default.
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39 bool TargetOptions::HonorSignDependentRoundingFPMath() const {
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40 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
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41 }