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61fc8d670f
Function attributes are the future! So just query whether we want to realign the stack directly from the function instead of through a random target options structure. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187618 91177308-0d34-0410-b5e6-96231b3b80d8
230 lines
9.7 KiB
C++
230 lines
9.7 KiB
C++
//===-- llvm/Target/TargetOptions.h - Target Options ------------*- C++ -*-===//
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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 defines command line option flags that are shared across various
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// targets.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETOPTIONS_H
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#define LLVM_TARGET_TARGETOPTIONS_H
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#include <string>
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namespace llvm {
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class MachineFunction;
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class StringRef;
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// Possible float ABI settings. Used with FloatABIType in TargetOptions.h.
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namespace FloatABI {
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enum ABIType {
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Default, // Target-specific (either soft or hard depending on triple,etc).
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Soft, // Soft float.
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Hard // Hard float.
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};
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}
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namespace FPOpFusion {
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enum FPOpFusionMode {
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Fast, // Enable fusion of FP ops wherever it's profitable.
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Standard, // Only allow fusion of 'blessed' ops (currently just fmuladd).
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Strict // Never fuse FP-ops.
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};
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}
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class TargetOptions {
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public:
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TargetOptions()
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: PrintMachineCode(false), NoFramePointerElim(false),
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LessPreciseFPMADOption(false),
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UnsafeFPMath(false), NoInfsFPMath(false),
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NoNaNsFPMath(false), HonorSignDependentRoundingFPMathOption(false),
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UseSoftFloat(false), NoZerosInBSS(false),
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JITEmitDebugInfo(false), JITEmitDebugInfoToDisk(false),
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GuaranteedTailCallOpt(false), DisableTailCalls(false),
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StackAlignmentOverride(0),
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EnableFastISel(false), PositionIndependentExecutable(false),
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EnableSegmentedStacks(false), UseInitArray(false), TrapFuncName(""),
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FloatABIType(FloatABI::Default), AllowFPOpFusion(FPOpFusion::Standard)
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{}
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/// PrintMachineCode - This flag is enabled when the -print-machineinstrs
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/// option is specified on the command line, and should enable debugging
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/// output from the code generator.
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unsigned PrintMachineCode : 1;
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/// NoFramePointerElim - This flag is enabled when the -disable-fp-elim is
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/// specified on the command line. If the target supports the frame pointer
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/// elimination optimization, this option should disable it.
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unsigned NoFramePointerElim : 1;
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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 DisableFramePointerElim(const MachineFunction &MF) const;
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/// LessPreciseFPMAD - This flag is enabled when the
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/// -enable-fp-mad is specified on the command line. When this flag is off
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/// (the default), the code generator is not allowed to generate mad
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/// (multiply add) if the result is "less precise" than doing those
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/// operations individually.
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unsigned LessPreciseFPMADOption : 1;
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bool LessPreciseFPMAD() const;
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/// UnsafeFPMath - This flag is enabled when the
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/// -enable-unsafe-fp-math flag is specified on the command line. When
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/// this flag is off (the default), the code generator is not allowed to
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/// produce results that are "less precise" than IEEE allows. This includes
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/// use of X86 instructions like FSIN and FCOS instead of libcalls.
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/// UnsafeFPMath implies LessPreciseFPMAD.
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unsigned UnsafeFPMath : 1;
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/// NoInfsFPMath - This flag is enabled when the
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/// -enable-no-infs-fp-math flag is specified on the command line. When
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/// this flag is off (the default), the code generator is not allowed to
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/// assume the FP arithmetic arguments and results are never +-Infs.
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unsigned NoInfsFPMath : 1;
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/// NoNaNsFPMath - This flag is enabled when the
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/// -enable-no-nans-fp-math flag is specified on the command line. When
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/// this flag is off (the default), the code generator is not allowed to
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/// assume the FP arithmetic arguments and results are never NaNs.
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unsigned NoNaNsFPMath : 1;
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/// HonorSignDependentRoundingFPMath - This returns true when the
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/// -enable-sign-dependent-rounding-fp-math is specified. If this returns
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/// false (the default), the code generator is allowed to assume that the
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/// rounding behavior is the default (round-to-zero for all floating point
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/// to integer conversions, and round-to-nearest for all other arithmetic
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/// truncations). If this is enabled (set to true), the code generator must
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/// assume that the rounding mode may dynamically change.
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unsigned HonorSignDependentRoundingFPMathOption : 1;
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bool HonorSignDependentRoundingFPMath() const;
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/// UseSoftFloat - This flag is enabled when the -soft-float flag is
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/// specified on the command line. When this flag is on, the code generator
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/// will generate libcalls to the software floating point library instead of
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/// target FP instructions.
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unsigned UseSoftFloat : 1;
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/// NoZerosInBSS - By default some codegens place zero-initialized data to
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/// .bss section. This flag disables such behaviour (necessary, e.g. for
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/// crt*.o compiling).
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unsigned NoZerosInBSS : 1;
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/// JITEmitDebugInfo - This flag indicates that the JIT should try to emit
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/// debug information and notify a debugger about it.
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unsigned JITEmitDebugInfo : 1;
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/// JITEmitDebugInfoToDisk - This flag indicates that the JIT should write
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/// the object files generated by the JITEmitDebugInfo flag to disk. This
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/// flag is hidden and is only for debugging the debug info.
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unsigned JITEmitDebugInfoToDisk : 1;
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/// GuaranteedTailCallOpt - This flag is enabled when -tailcallopt is
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/// specified on the commandline. When the flag is on, participating targets
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/// will perform tail call optimization on all calls which use the fastcc
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/// calling convention and which satisfy certain target-independent
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/// criteria (being at the end of a function, having the same return type
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/// as their parent function, etc.), using an alternate ABI if necessary.
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unsigned GuaranteedTailCallOpt : 1;
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/// DisableTailCalls - This flag controls whether we will use tail calls.
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/// Disabling them may be useful to maintain a correct call stack.
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unsigned DisableTailCalls : 1;
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/// StackAlignmentOverride - Override default stack alignment for target.
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unsigned StackAlignmentOverride;
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/// EnableFastISel - This flag enables fast-path instruction selection
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/// which trades away generated code quality in favor of reducing
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/// compile time.
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unsigned EnableFastISel : 1;
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/// PositionIndependentExecutable - This flag indicates whether the code
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/// will eventually be linked into a single executable, despite the PIC
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/// relocation model being in use. It's value is undefined (and irrelevant)
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/// if the relocation model is anything other than PIC.
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unsigned PositionIndependentExecutable : 1;
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unsigned EnableSegmentedStacks : 1;
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/// UseInitArray - Use .init_array instead of .ctors for static
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/// constructors.
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unsigned UseInitArray : 1;
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/// getTrapFunctionName - If this returns a non-empty string, this means
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/// isel should lower Intrinsic::trap to a call to the specified function
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/// name instead of an ISD::TRAP node.
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std::string TrapFuncName;
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StringRef getTrapFunctionName() const;
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/// FloatABIType - This setting is set by -float-abi=xxx option is specfied
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/// on the command line. This setting may either be Default, Soft, or Hard.
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/// Default selects the target's default behavior. Soft selects the ABI for
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/// UseSoftFloat, but does not indicate that FP hardware may not be used.
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/// Such a combination is unfortunately popular (e.g. arm-apple-darwin).
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/// Hard presumes that the normal FP ABI is used.
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FloatABI::ABIType FloatABIType;
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/// AllowFPOpFusion - This flag is set by the -fuse-fp-ops=xxx option.
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/// This controls the creation of fused FP ops that store intermediate
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/// results in higher precision than IEEE allows (E.g. FMAs).
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///
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/// Fast mode - allows formation of fused FP ops whenever they're
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/// profitable.
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/// Standard mode - allow fusion only for 'blessed' FP ops. At present the
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/// only blessed op is the fmuladd intrinsic. In the future more blessed ops
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/// may be added.
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/// Strict mode - allow fusion only if/when it can be proven that the excess
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/// precision won't effect the result.
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///
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/// Note: This option only controls formation of fused ops by the
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/// optimizers. Fused operations that are explicitly specified (e.g. FMA
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/// via the llvm.fma.* intrinsic) will always be honored, regardless of
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/// the value of this option.
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FPOpFusion::FPOpFusionMode AllowFPOpFusion;
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};
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// Comparison operators:
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inline bool operator==(const TargetOptions &LHS,
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const TargetOptions &RHS) {
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#define ARE_EQUAL(X) LHS.X == RHS.X
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return
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ARE_EQUAL(UnsafeFPMath) &&
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ARE_EQUAL(NoInfsFPMath) &&
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ARE_EQUAL(NoNaNsFPMath) &&
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ARE_EQUAL(HonorSignDependentRoundingFPMathOption) &&
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ARE_EQUAL(UseSoftFloat) &&
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ARE_EQUAL(NoZerosInBSS) &&
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ARE_EQUAL(JITEmitDebugInfo) &&
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ARE_EQUAL(JITEmitDebugInfoToDisk) &&
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ARE_EQUAL(GuaranteedTailCallOpt) &&
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ARE_EQUAL(DisableTailCalls) &&
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ARE_EQUAL(StackAlignmentOverride) &&
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ARE_EQUAL(EnableFastISel) &&
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ARE_EQUAL(PositionIndependentExecutable) &&
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ARE_EQUAL(EnableSegmentedStacks) &&
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ARE_EQUAL(UseInitArray) &&
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ARE_EQUAL(TrapFuncName) &&
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ARE_EQUAL(FloatABIType) &&
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ARE_EQUAL(AllowFPOpFusion);
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#undef ARE_EQUAL
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}
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inline bool operator!=(const TargetOptions &LHS,
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const TargetOptions &RHS) {
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return !(LHS == RHS);
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}
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} // End llvm namespace
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#endif
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