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author | Joseph Myers <joseph@codesourcery.com> | 2016-08-05 18:15:00 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2016-08-05 18:15:00 +0000 |
commit | 89a12e6f8e0a9776ea52389c58bf77aba87fd243 (patch) | |
tree | b7b4d9ca8a83d44056ad39fd5d1746b7654b9186 /math/math.h | |
parent | f0e3925bf3b8df6940c3346db17e42615979d458 (diff) | |
download | glibc-89a12e6f8e0a9776ea52389c58bf77aba87fd243.zip glibc-89a12e6f8e0a9776ea52389c58bf77aba87fd243.tar.gz glibc-89a12e6f8e0a9776ea52389c58bf77aba87fd243.tar.bz2 |
Fix math.h comment about bits/mathdef.h.
math.h has a comment about definitions from <bits/mathdef.h>. This
comment is in the wrong place in math.h, far below the inclusion of
<bits/mathdef.h>. It was originally above the inclusion, but the
inclusion was moved by
1998-11-05 Ulrich Drepper <drepper@cygnus.com>
* math/math.h: Unconditionally include bits/mathdef.h. Declare
long double functions only if __NO_LONG_DOUBLE_MATH is not
defined.
[...]
without moving the comment. Furthermore, the comment refers
incorrectly to FLT_EVAL_METHOD and DECIMAL_DIG, which are actually
<float.h> macros, and INFINITY, which is in <bits/inf.h>.
This patch moves the comment back above the include it refers to and
removes the description of macros not defined by the header.
Tested for x86_64 and x86 (testsuite, and that installed stripped
shared libraries are unchanged by the patch).
* math/math.h: Move comment about <bits/mathdef.h> definitions
above inclusion of <bits/mathdef.h>. Do not mention
FLT_EVAL_METHOD, INFINITY or DECIMAL_DIG in that comment.
Diffstat (limited to 'math/math.h')
-rw-r--r-- | math/math.h | 55 |
1 files changed, 21 insertions, 34 deletions
diff --git a/math/math.h b/math/math.h index ff9d70a..2f77dee 100644 --- a/math/math.h +++ b/math/math.h @@ -45,7 +45,27 @@ __BEGIN_DECLS # include <bits/nan.h> #endif /* __USE_ISOC99 */ -/* Get general and ISO C99 specific information. */ +/* Get the architecture specific values describing the floating-point + evaluation. The following symbols will get defined: + + float_t floating-point type at least as wide as `float' used + to evaluate `float' expressions + double_t floating-point type at least as wide as `double' used + to evaluate `double' expressions + + FP_FAST_FMA + FP_FAST_FMAF + FP_FAST_FMAL + If defined it indicates that the `fma' function + generally executes about as fast as a multiply and an add. + This macro is defined only iff the `fma' function is + implemented directly with a hardware multiply-add instructions. + + FP_ILOGB0 Expands to a value returned by `ilogb (0.0)'. + FP_ILOGBNAN Expands to a value returned by `ilogb (NAN)'. + +*/ + #include <bits/mathdef.h> /* The file <bits/mathcalls.h> contains the prototypes for all the @@ -173,39 +193,6 @@ extern int signgam; /* ISO C99 defines some generic macros which work on any data type. */ #ifdef __USE_ISOC99 -/* Get the architecture specific values describing the floating-point - evaluation. The following symbols will get defined: - - float_t floating-point type at least as wide as `float' used - to evaluate `float' expressions - double_t floating-point type at least as wide as `double' used - to evaluate `double' expressions - - FLT_EVAL_METHOD - Defined to - 0 if `float_t' is `float' and `double_t' is `double' - 1 if `float_t' and `double_t' are `double' - 2 if `float_t' and `double_t' are `long double' - else `float_t' and `double_t' are unspecified - - INFINITY representation of the infinity value of type `float' - - FP_FAST_FMA - FP_FAST_FMAF - FP_FAST_FMAL - If defined it indicates that the `fma' function - generally executes about as fast as a multiply and an add. - This macro is defined only iff the `fma' function is - implemented directly with a hardware multiply-add instructions. - - FP_ILOGB0 Expands to a value returned by `ilogb (0.0)'. - FP_ILOGBNAN Expands to a value returned by `ilogb (NAN)'. - - DECIMAL_DIG Number of decimal digits supported by conversion between - decimal and all internal floating-point formats. - -*/ - /* All floating-point numbers can be put in one of these categories. */ enum { |