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annotate lib/CodeGen/TargetOptionsImpl.cpp @ 120:1172e4bd9c6f

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update 4.0.0
author mir3636
date Fri, 25 Nov 2016 19:14:25 +0900
parents afa8332a0e37
children 803732b1fca8
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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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14 #include "llvm/IR/Function.h"
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15 #include "llvm/IR/Module.h"
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16 #include "llvm/CodeGen/MachineFrameInfo.h"
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17 #include "llvm/CodeGen/MachineFunction.h"
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18 #include "llvm/Target/TargetFrameLowering.h"
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19 #include "llvm/Target/TargetOptions.h"
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20 #include "llvm/Target/TargetSubtargetInfo.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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33
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34 return false;
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35 }
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37 /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
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38 /// is specified on the command line. When this flag is off(default), the
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39 /// code generator is not allowed to generate mad (multiply add) if the
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40 /// result is "less precise" than doing those operations individually.
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41 bool TargetOptions::LessPreciseFPMAD() const {
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42 return UnsafeFPMath || LessPreciseFPMADOption;
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43 }
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45 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
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46 /// that the rounding mode of the FPU can change from its default.
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47 bool TargetOptions::HonorSignDependentRoundingFPMath() const {
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48 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
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49 }