diff options
Diffstat (limited to 'gcc/doc/extend.texi')
| -rw-r--r-- | gcc/doc/extend.texi | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/gcc/doc/extend.texi b/gcc/doc/extend.texi index 36e81ffe55c..78d581d62e6 100644 --- a/gcc/doc/extend.texi +++ b/gcc/doc/extend.texi @@ -5764,6 +5764,7 @@ should be called and the @var{flag} argument passed to it. @node Other Builtins @section Other built-in functions provided by GCC @cindex built-in functions +@findex __builtin_fpclassify @findex __builtin_isfinite @findex __builtin_isnormal @findex __builtin_isgreater @@ -6295,10 +6296,10 @@ the same names as the standard macros ( @code{isgreater}, @code{islessgreater}, and @code{isunordered}) , with @code{__builtin_} prefixed. We intend for a library implementor to be able to simply @code{#define} each standard macro to its built-in equivalent. -In the same fashion, GCC provides @code{isfinite}, @code{isinf_sign} -and @code{isnormal} built-ins used with @code{__builtin_} prefixed. -The @code{isinf} and @code{isnan} builtins appear both with and -without the @code{__builtin_} prefix. +In the same fashion, GCC provides @code{fpclassify}, @code{isfinite}, +@code{isinf_sign} and @code{isnormal} built-ins used with +@code{__builtin_} prefixed. The @code{isinf} and @code{isnan} +builtins appear both with and without the @code{__builtin_} prefix. @deftypefn {Built-in Function} int __builtin_types_compatible_p (@var{type1}, @var{type2}) @@ -6555,6 +6556,17 @@ Similar to @code{__builtin_huge_val}, except the return type is @code{long double}. @end deftypefn +@deftypefn {Built-in Function} int __builtin_fpclassify (int, int, int, int, int, ...) +This built-in implements the C99 fpclassify functionality. The first +five int arguments should be the target library's notion of the +possible FP classes and are used for return values. They must be +constant values and they must appear in this order: @code{FP_NAN}, +@code{FP_INF}, @code{FP_NORMAL}, @code{FP_SUBNORMAL} and +@code{FP_ZERO}. The ellipsis is for exactly one floating point value +to classify. GCC treats the last argument as type-generic, which +means it does not do default promotion from float to double. +@end deftypefn + @deftypefn {Built-in Function} double __builtin_inf (void) Similar to @code{__builtin_huge_val}, except a warning is generated if the target floating-point format does not support infinities. |