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annotate lib/CodeGen/TargetOptionsImpl.cpp @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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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/CodeGen/MachineFrameInfo.h"
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16 #include "llvm/CodeGen/MachineFunction.h"
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17 #include "llvm/Target/TargetOptions.h"
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18 using namespace llvm;
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19
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20 /// DisableFramePointerElim - This returns true if frame pointer elimination
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21 /// optimization should be disabled for the given machine function.
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22 bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
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23 // Check to see if we should eliminate non-leaf frame pointers and then
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24 // check to see if we should eliminate all frame pointers.
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25 if (MF.getFunction()->hasFnAttribute("no-frame-pointer-elim-non-leaf") &&
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26 !NoFramePointerElim) {
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27 const MachineFrameInfo *MFI = MF.getFrameInfo();
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28 return MFI->hasCalls();
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29 }
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30
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31 return NoFramePointerElim;
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32 }
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33
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34 /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
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35 /// is specified on the command line. When this flag is off(default), the
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36 /// code generator is not allowed to generate mad (multiply add) if the
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37 /// result is "less precise" than doing those operations individually.
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38 bool TargetOptions::LessPreciseFPMAD() const {
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39 return UnsafeFPMath || LessPreciseFPMADOption;
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40 }
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41
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42 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
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43 /// that the rounding mode of the FPU can change from its default.
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44 bool TargetOptions::HonorSignDependentRoundingFPMath() const {
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45 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
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46 }
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48 /// getTrapFunctionName - If this returns a non-empty string, this means isel
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49 /// should lower Intrinsic::trap to a call to the specified function name
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50 /// instead of an ISD::TRAP node.
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51 StringRef TargetOptions::getTrapFunctionName() const {
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52 return TrapFuncName;
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53 }
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55 /// getCFIFuncName - If this returns a non-empty string, then it is the name of
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56 /// the function that gets called on CFI violations in CFI non-enforcing mode
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57 /// (!TargetOptions::CFIEnforcing).
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58 StringRef TargetOptions::getCFIFuncName() const {
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59 return CFIFuncName;
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60 }