1 //===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements the methods in the TargetOptions.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/IR/Function.h"
15 #include "llvm/IR/Module.h"
16 #include "llvm/CodeGen/MachineFrameInfo.h"
17 #include "llvm/CodeGen/MachineFunction.h"
18 #include "llvm/Target/TargetFrameLowering.h"
19 #include "llvm/Target/TargetOptions.h"
20 #include "llvm/Target/TargetSubtargetInfo.h"
23 /// DisableFramePointerElim - This returns true if frame pointer elimination
24 /// optimization should be disabled for the given machine function.
25 bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
26 // Check to see if we should eliminate all frame pointers.
27 if (MF.getSubtarget().getFrameLowering()->noFramePointerElim(MF))
30 // Check to see if we should eliminate non-leaf frame pointers.
31 if (MF.getFunction()->hasFnAttribute("no-frame-pointer-elim-non-leaf"))
32 return MF.getFrameInfo()->hasCalls();
37 /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
38 /// is specified on the command line. When this flag is off(default), the
39 /// code generator is not allowed to generate mad (multiply add) if the
40 /// result is "less precise" than doing those operations individually.
41 bool TargetOptions::LessPreciseFPMAD() const {
42 return UnsafeFPMath || LessPreciseFPMADOption;
45 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
46 /// that the rounding mode of the FPU can change from its default.
47 bool TargetOptions::HonorSignDependentRoundingFPMath() const {
48 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
51 /// getTrapFunctionName - If this returns a non-empty string, this means isel
52 /// should lower Intrinsic::trap to a call to the specified function name
53 /// instead of an ISD::TRAP node.
54 StringRef TargetOptions::getTrapFunctionName() const {
59 void llvm::setFunctionAttributes(StringRef CPU, StringRef Features,
60 const TargetOptions &Options, Module &M,
61 bool AlwaysRecordAttrs) {
63 auto &Ctx = F.getContext();
64 AttributeSet Attrs = F.getAttributes(), NewAttrs;
67 NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
70 if (!Features.empty())
71 NewAttrs = NewAttrs.addAttribute(Ctx, AttributeSet::FunctionIndex,
72 "target-features", Features);
74 if (Options.NoFramePointerElimOverride || AlwaysRecordAttrs)
75 NewAttrs = NewAttrs.addAttribute(
76 Ctx, AttributeSet::FunctionIndex, "no-frame-pointer-elim",
77 Options.NoFramePointerElim ? "true" : "false");
79 // Let NewAttrs override Attrs.
80 NewAttrs = Attrs.addAttributes(Ctx, AttributeSet::FunctionIndex, NewAttrs);
81 F.setAttributes(NewAttrs);