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/MachineFrameInfo.h"
16 #include "llvm/CodeGen/MachineFunction.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.
DisableFramePointerElim(const MachineFunction & MF) const22 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.
LessPreciseFPMAD() const38 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.
HonorSignDependentRoundingFPMath() const44 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.
getTrapFunctionName() const51 StringRef TargetOptions::getTrapFunctionName() const {
52   return TrapFuncName;
53 }
54 
55 /// getCFIFuncName - If this returns a non-empty string, then it is the name of
56 /// the function that gets called on CFI violations in CFI non-enforcing mode
57 /// (!TargetOptions::CFIEnforcing).
getCFIFuncName() const58 StringRef TargetOptions::getCFIFuncName() const {
59   return CFIFuncName;
60 }
61