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Fix math.h comment about bits/mathdef.h.

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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.
This commit is contained in:
Joseph Myers 2016-08-05 18:15:00 +00:00
parent f0e3925bf3
commit 89a12e6f8e
2 changed files with 27 additions and 34 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2016-08-05 Joseph Myers <joseph@codesourcery.com>
* 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.
2016-08-05 Torvald Riegel <triegel@redhat.com>
* include/atomic.h (atomic_exchange_relaxed): New.

55
math/math.h
View File

@ -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
{