jlebar created this revision. jlebar added a reviewer: rsmith. jlebar added a subscriber: cfe-commits.
http://reviews.llvm.org/D20457 Files: include/clang/Basic/LangOptions.def include/clang/Driver/Options.td Index: include/clang/Driver/Options.td =================================================================== --- include/clang/Driver/Options.td +++ include/clang/Driver/Options.td @@ -592,9 +592,13 @@ def : Flag<["-"], "fno-extended-identifiers">, Group<f_Group>, Flags<[Unsupported]>; def fhosted : Flag<["-"], "fhosted">, Group<f_Group>; def ffast_math : Flag<["-"], "ffast-math">, Group<f_Group>, Flags<[CC1Option]>, - HelpText<"Enable the *frontend*'s 'fast-math' mode. This has no effect on " - "optimizations, but provides a preprocessor macro __FAST_MATH__ the " - "same as GCC's -ffast-math flag">; + HelpText<"Enable fast-math mode. This defines the __FAST_MATH__ preprocessor " + "macro, and lets the compiler make aggressive, potentially unsafe " + "assumptions about floating-point math. These include: " + "Floating-point math obeys regular algebraic rules for real " + "numbers (e.g. + and * are associative, and x/y == x * (1/y)), " + "operands to fp operations are not equal to NaN and Inf, and +0 " + "and -0 are interchangeable.">; def fno_fast_math : Flag<["-"], "fno-fast-math">, Group<f_Group>; def fmath_errno : Flag<["-"], "fmath-errno">, Group<f_Group>, Flags<[CC1Option]>, HelpText<"Require math functions to indicate errors by setting errno">; Index: include/clang/Basic/LangOptions.def =================================================================== --- include/clang/Basic/LangOptions.def +++ include/clang/Basic/LangOptions.def @@ -162,7 +162,7 @@ COMPATIBLE_LANGOPT(GNUInline , 1, 0, "GNU inline semantics") COMPATIBLE_LANGOPT(NoInlineDefine , 1, 0, "__NO_INLINE__ predefined macro") COMPATIBLE_LANGOPT(Deprecated , 1, 0, "__DEPRECATED predefined macro") -COMPATIBLE_LANGOPT(FastMath , 1, 0, "__FAST_MATH__ predefined macro") +COMPATIBLE_LANGOPT(FastMath , 1, 0, "Fast fp math optimizations, and __FAST_MATH__ predefined macro") COMPATIBLE_LANGOPT(FiniteMathOnly , 1, 0, "__FINITE_MATH_ONLY__ predefined macro") COMPATIBLE_LANGOPT(UnsafeFPMath , 1, 0, "Unsafe Floating Point Math")
Index: include/clang/Driver/Options.td =================================================================== --- include/clang/Driver/Options.td +++ include/clang/Driver/Options.td @@ -592,9 +592,13 @@ def : Flag<["-"], "fno-extended-identifiers">, Group<f_Group>, Flags<[Unsupported]>; def fhosted : Flag<["-"], "fhosted">, Group<f_Group>; def ffast_math : Flag<["-"], "ffast-math">, Group<f_Group>, Flags<[CC1Option]>, - HelpText<"Enable the *frontend*'s 'fast-math' mode. This has no effect on " - "optimizations, but provides a preprocessor macro __FAST_MATH__ the " - "same as GCC's -ffast-math flag">; + HelpText<"Enable fast-math mode. This defines the __FAST_MATH__ preprocessor " + "macro, and lets the compiler make aggressive, potentially unsafe " + "assumptions about floating-point math. These include: " + "Floating-point math obeys regular algebraic rules for real " + "numbers (e.g. + and * are associative, and x/y == x * (1/y)), " + "operands to fp operations are not equal to NaN and Inf, and +0 " + "and -0 are interchangeable.">; def fno_fast_math : Flag<["-"], "fno-fast-math">, Group<f_Group>; def fmath_errno : Flag<["-"], "fmath-errno">, Group<f_Group>, Flags<[CC1Option]>, HelpText<"Require math functions to indicate errors by setting errno">; Index: include/clang/Basic/LangOptions.def =================================================================== --- include/clang/Basic/LangOptions.def +++ include/clang/Basic/LangOptions.def @@ -162,7 +162,7 @@ COMPATIBLE_LANGOPT(GNUInline , 1, 0, "GNU inline semantics") COMPATIBLE_LANGOPT(NoInlineDefine , 1, 0, "__NO_INLINE__ predefined macro") COMPATIBLE_LANGOPT(Deprecated , 1, 0, "__DEPRECATED predefined macro") -COMPATIBLE_LANGOPT(FastMath , 1, 0, "__FAST_MATH__ predefined macro") +COMPATIBLE_LANGOPT(FastMath , 1, 0, "Fast fp math optimizations, and __FAST_MATH__ predefined macro") COMPATIBLE_LANGOPT(FiniteMathOnly , 1, 0, "__FINITE_MATH_ONLY__ predefined macro") COMPATIBLE_LANGOPT(UnsafeFPMath , 1, 0, "Unsafe Floating Point Math")
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