| //===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements the methods in the TargetOptions. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/CodeGen/MachineFrameInfo.h" |
| #include "llvm/CodeGen/MachineFunction.h" |
| #include "llvm/CodeGen/TargetFrameLowering.h" |
| #include "llvm/CodeGen/TargetSubtargetInfo.h" |
| #include "llvm/IR/Function.h" |
| #include "llvm/IR/Module.h" |
| #include "llvm/Target/TargetOptions.h" |
| using namespace llvm; |
| |
| /// DisableFramePointerElim - This returns true if frame pointer elimination |
| /// optimization should be disabled for the given machine function. |
| bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const { |
| // Check to see if the target want to forcably keep frame pointer. |
| if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF)) |
| return true; |
| |
| const Function &F = MF.getFunction(); |
| |
| // TODO: Remove support for old `fp elim` function attributes after fully |
| // migrate to use "frame-pointer" |
| if (!F.hasFnAttribute("frame-pointer")) { |
| // Check to see if we should eliminate all frame pointers. |
| if (F.getFnAttribute("no-frame-pointer-elim").getValueAsString() == "true") |
| return true; |
| |
| // Check to see if we should eliminate non-leaf frame pointers. |
| if (F.hasFnAttribute("no-frame-pointer-elim-non-leaf")) |
| return MF.getFrameInfo().hasCalls(); |
| |
| return false; |
| } |
| |
| StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString(); |
| if (FP == "all") |
| return true; |
| if (FP == "non-leaf") |
| return MF.getFrameInfo().hasCalls(); |
| if (FP == "none") |
| return false; |
| llvm_unreachable("unknown frame pointer flag"); |
| } |
| |
| /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume |
| /// that the rounding mode of the FPU can change from its default. |
| bool TargetOptions::HonorSignDependentRoundingFPMath() const { |
| return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; |
| } |