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50 lines
2.0 KiB
50 lines
2.0 KiB
4 months ago
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//===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the methods in the TargetOptions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Module.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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using namespace llvm;
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/// DisableFramePointerElim - This returns true if frame pointer elimination
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/// optimization should be disabled for the given machine function.
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bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
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// Check to see if we should eliminate all frame pointers.
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if (MF.getSubtarget().getFrameLowering()->noFramePointerElim(MF))
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return true;
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// Check to see if we should eliminate non-leaf frame pointers.
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if (MF.getFunction()->hasFnAttribute("no-frame-pointer-elim-non-leaf"))
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return MF.getFrameInfo()->hasCalls();
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return false;
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}
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/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option
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/// is specified on the command line. When this flag is off(default), the
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/// code generator is not allowed to generate mad (multiply add) if the
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/// result is "less precise" than doing those operations individually.
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bool TargetOptions::LessPreciseFPMAD() const {
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return UnsafeFPMath || LessPreciseFPMADOption;
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}
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/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
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/// that the rounding mode of the FPU can change from its default.
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bool TargetOptions::HonorSignDependentRoundingFPMath() const {
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return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
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}
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