1 //===-- llvm/Target/TargetOptions.h - Target Options ------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines command line option flags that are shared across various
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TARGET_TARGETOPTIONS_H
16 #define LLVM_TARGET_TARGETOPTIONS_H
19 /// PrintMachineCode - This flag is enabled when the -print-machineinstrs
20 /// option is specified on the command line, and should enable debugging
21 /// output from the code generator.
22 extern bool PrintMachineCode;
24 /// NoFramePointerElim - This flag is enabled when the -disable-fp-elim is
25 /// specified on the command line. If the target supports the frame pointer
26 /// elimination optimization, this option should disable it.
27 extern bool NoFramePointerElim;
29 /// NoExcessFPPrecision - This flag is enabled when the
30 /// -disable-excess-fp-precision flag is specified on the command line. When
31 /// this flag is off (the default), the code generator is allowed to produce
32 /// results that are "more precise" than IEEE allows. This includes use of
33 /// FMA-like operations and use of the X86 FP registers without rounding all
35 extern bool NoExcessFPPrecision;
37 /// UnsafeFPMath - This flag is enabled when the
38 /// -enable-unsafe-fp-math flag is specified on the command line. When
39 /// this flag is off (the default), the code generator is not allowed to
40 /// produce results that are "less precise" than IEEE allows. This includes
41 /// use of X86 instructions like FSIN and FCOS instead of libcalls.
42 /// UnsafeFPMath implies FiniteOnlyFPMath.
43 extern bool UnsafeFPMath;
45 /// FiniteOnlyFPMath - This returns true when the -enable-finite-only-fp-math
46 /// option is specified on the command line. If this returns false (default),
47 /// the code generator is not allowed to assume that FP arithmetic arguments
48 /// and results are never NaNs or +-Infs.
49 extern bool FiniteOnlyFPMathOption;
50 extern bool FiniteOnlyFPMath();
52 /// HonorSignDependentRoundingFPMath - This returns true when the
53 /// -enable-sign-dependent-rounding-fp-math is specified. If this returns
54 /// false (the default), the code generator is allowed to assume that the
55 /// rounding behavior is the default (round-to-zero for all floating point to
56 /// integer conversions, and round-to-nearest for all other arithmetic
57 /// truncations). If this is enabled (set to true), the code generator must
58 /// assume that the rounding mode may dynamically change.
59 extern bool HonorSignDependentRoundingFPMathOption;
60 extern bool HonorSignDependentRoundingFPMath();
62 /// UseSoftFloat - This flag is enabled when the -soft-float flag is specified
63 /// on the command line. When this flag is on, the code generator will
64 /// generate libcalls to the software floating point library instead of
65 /// target FP instructions.
66 extern bool UseSoftFloat;
68 /// NoZerosInBSS - By default some codegens place zero-initialized data to
69 /// .bss section. This flag disables such behaviour (necessary, e.g. for
70 /// crt*.o compiling).
71 extern bool NoZerosInBSS;
73 /// ExceptionHandling - This flag indicates that exception information should
75 extern bool ExceptionHandling;
77 /// PerformTailCallOpt - This flag is enabled when -tailcallopt is specified
78 /// on the commandline. When the flag is on, the target will perform tail call
79 /// optimization (pop the caller's stack) providing it supports it.
80 extern bool PerformTailCallOpt;
81 } // End llvm namespace