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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148442 91177308-0d34-0410-b5e6-96231b3b80d8
190 lines
8.4 KiB
C++
190 lines
8.4 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 of 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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/// StrongPHIElim - This flag enables more aggressive PHI elimination
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/// wth earlier copy coalescing.
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extern bool StrongPHIElim;
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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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NoFramePointerElimNonLeaf(false), LessPreciseFPMADOption(false),
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NoExcessFPPrecision(false), UnsafeFPMath(false), NoInfsFPMath(false),
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NoNaNsFPMath(false), HonorSignDependentRoundingFPMathOption(false),
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UseSoftFloat(false), NoZerosInBSS(false), JITExceptionHandling(false),
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JITEmitDebugInfo(false), JITEmitDebugInfoToDisk(false),
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GuaranteedTailCallOpt(false), DisableTailCalls(false),
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StackAlignmentOverride(0), RealignStack(true),
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DisableJumpTables(false), EnableFastISel(false),
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EnableSegmentedStacks(false), TrapFuncName(""),
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FloatABIType(FloatABI::Default)
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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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/// NoFramePointerElimNonLeaf - This flag is enabled when the
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/// -disable-non-leaf-fp-elim is specified on the command line. If the
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/// target supports the frame pointer elimination optimization, this option
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/// should disable it for non-leaf functions.
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unsigned NoFramePointerElimNonLeaf : 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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/// NoExcessFPPrecision - This flag is enabled when the
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/// -disable-excess-fp-precision flag is specified on the command line.
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/// When this flag is off (the default), the code generator is allowed to
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/// produce results that are "more precise" than IEEE allows. This includes
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/// use of FMA-like operations and use of the X86 FP registers without
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/// rounding all over the place.
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unsigned NoExcessFPPrecision : 1;
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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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/// JITExceptionHandling - This flag indicates that the JIT should emit
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/// exception handling information.
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unsigned JITExceptionHandling : 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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/// RealignStack - This flag indicates whether the stack should be
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/// automatically realigned, if needed.
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unsigned RealignStack : 1;
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/// DisableJumpTables - This flag indicates jump tables should not be
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/// generated.
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unsigned DisableJumpTables : 1;
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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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unsigned EnableSegmentedStacks : 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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};
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} // End llvm namespace
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#endif
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