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comparison lib/CodeGen/TargetOptionsImpl.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children 54457678186b
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-1:000000000000 0:95c75e76d11b
1 //===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file implements the methods in the TargetOptions.
11 //
12 //===----------------------------------------------------------------------===//
13
14 #include "llvm/IR/Function.h"
15 #include "llvm/CodeGen/MachineFunction.h"
16 #include "llvm/CodeGen/MachineFrameInfo.h"
17 #include "llvm/Target/TargetOptions.h"
18 using namespace llvm;
19
20 /// DisableFramePointerElim - This returns true if frame pointer elimination
21 /// optimization should be disabled for the given machine function.
22 bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
23 // Check to see if we should eliminate non-leaf frame pointers and then
24 // check to see if we should eliminate all frame pointers.
25 if (MF.getFunction()->hasFnAttribute("no-frame-pointer-elim-non-leaf") &&
26 !NoFramePointerElim) {
27 const MachineFrameInfo *MFI = MF.getFrameInfo();
28 return MFI->hasCalls();
29 }
30
31 return NoFramePointerElim;
32 }
33
34 /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
35 /// is specified on the command line. When this flag is off(default), the
36 /// code generator is not allowed to generate mad (multiply add) if the
37 /// result is "less precise" than doing those operations individually.
38 bool TargetOptions::LessPreciseFPMAD() const {
39 return UnsafeFPMath || LessPreciseFPMADOption;
40 }
41
42 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
43 /// that the rounding mode of the FPU can change from its default.
44 bool TargetOptions::HonorSignDependentRoundingFPMath() const {
45 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
46 }
47
48 /// getTrapFunctionName - If this returns a non-empty string, this means isel
49 /// should lower Intrinsic::trap to a call to the specified function name
50 /// instead of an ISD::TRAP node.
51 StringRef TargetOptions::getTrapFunctionName() const {
52 return TrapFuncName;
53 }