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Use C11 *_TRUE_MIN macros where applicable.

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C11 defines standard <float.h> macros *_TRUE_MIN for the least
positive subnormal value of a type.  Now that we build with
-std=gnu11, we can use these macros in glibc.  This patch replaces
previous uses of the GCC predefines __*_DENORM_MIN__ (used in
<float.h> to define *_TRUE_MIN), as well as *_DENORM_MIN references in
comments.

Tested for x86_64 and x86 (testsuite, and that installed shared
libraries are unchanged by the patch).  Also tested for powerpc that
installed stripped shared libraries are unchanged by the patch.

	* math/libm-test.inc (min_subnorm_value): Use LDBL_TRUE_MIN,
	DBL_TRUE_MIN and FLT_TRUE_MIN instead of __LDBL_DENORM_MIN__,
	__DBL_DENORM_MIN__ and __FLT_DENORM_MIN__.
	* sysdeps/ieee754/dbl-64/s_fma.c (__fma): Refer to DBL_TRUE_MIN
	instead of DBL_DENORM_MIN in comment.
	* sysdeps/ieee754/ldbl-128/s_fmal.c (__fmal): Refer to
	LDBL_TRUE_MIN instead of LDBL_DENORM_MIN in comment.
	* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c: Include <float.h>.
	(__nextafterl): Use LDBL_TRUE_MIN instead of __LDBL_DENORM_MIN__.
	* sysdeps/ieee754/ldbl-96/s_fmal.c (__fmal): Refer to
	LDBL_TRUE_MIN instead of LDBL_DENORM_MIN in comment.
This commit is contained in:
Joseph Myers 2015-10-28 21:42:52 +00:00
parent a62719ba90
commit 1f4dafa3ea
6 changed files with 27 additions and 12 deletions
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14
ChangeLog
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@ -1,3 +1,17 @@
2015-10-28 Joseph Myers <joseph@codesourcery.com>
* math/libm-test.inc (min_subnorm_value): Use LDBL_TRUE_MIN,
DBL_TRUE_MIN and FLT_TRUE_MIN instead of __LDBL_DENORM_MIN__,
__DBL_DENORM_MIN__ and __FLT_DENORM_MIN__.
* sysdeps/ieee754/dbl-64/s_fma.c (__fma): Refer to DBL_TRUE_MIN
instead of DBL_DENORM_MIN in comment.
* sysdeps/ieee754/ldbl-128/s_fmal.c (__fmal): Refer to
LDBL_TRUE_MIN instead of LDBL_DENORM_MIN in comment.
* sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c: Include <float.h>.
(__nextafterl): Use LDBL_TRUE_MIN instead of __LDBL_DENORM_MIN__.
* sysdeps/ieee754/ldbl-96/s_fmal.c (__fmal): Refer to
LDBL_TRUE_MIN instead of LDBL_DENORM_MIN in comment.
2015-10-28 Florian Weimer <fweimer@redhat.com>
[BZ# 19048]

12
math/libm-test.inc
View File

@ -315,12 +315,12 @@ static int ignore_max_ulp; /* Should we ignore max_ulp? */
LDBL_MAX, DBL_MAX, FLT_MAX)
#define min_value CHOOSE (LDBL_MIN, DBL_MIN, FLT_MIN, \
LDBL_MIN, DBL_MIN, FLT_MIN)
#define min_subnorm_value CHOOSE (__LDBL_DENORM_MIN__, \
__DBL_DENORM_MIN__, \
__FLT_DENORM_MIN__, \
__LDBL_DENORM_MIN__, \
__DBL_DENORM_MIN__, \
__FLT_DENORM_MIN__)
#define min_subnorm_value CHOOSE (LDBL_TRUE_MIN, \
DBL_TRUE_MIN, \
FLT_TRUE_MIN, \
LDBL_TRUE_MIN, \
DBL_TRUE_MIN, \
FLT_TRUE_MIN)
static FLOAT max_error, real_max_error, imag_max_error;

2
sysdeps/ieee754/dbl-64/s_fma.c
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@ -66,7 +66,7 @@ __fma (double x, double y, double z)
/* If fma will certainly overflow, compute as x * y. */
if (u.ieee.exponent + v.ieee.exponent > 0x7ff + IEEE754_DOUBLE_BIAS)
return x * y;
/* If x * y is less than 1/4 of DBL_DENORM_MIN, neither the
/* If x * y is less than 1/4 of DBL_TRUE_MIN, neither the
result nor whether there is underflow depends on its exact
value, only on its sign. */
if (u.ieee.exponent + v.ieee.exponent

2
sysdeps/ieee754/ldbl-128/s_fmal.c
View File

@ -68,7 +68,7 @@ __fmal (long double x, long double y, long double z)
if (u.ieee.exponent + v.ieee.exponent
> 0x7fff + IEEE854_LONG_DOUBLE_BIAS)
return x * y;
/* If x * y is less than 1/4 of LDBL_DENORM_MIN, neither the
/* If x * y is less than 1/4 of LDBL_TRUE_MIN, neither the
result nor whether there is underflow depends on its exact
value, only on its sign. */
if (u.ieee.exponent + v.ieee.exponent

7
sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c
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@ -24,6 +24,7 @@ static char rcsid[] = "$NetBSD: $";
* Special cases:
*/
#include <float.h>
#include <math.h>
#include <math_private.h>
#include <math_ldbl_opt.h>
@ -76,7 +77,7 @@ long double __nextafterl(long double x, long double y)
}
if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */
u = math_opt_barrier (x);
x -= __LDBL_DENORM_MIN__;
x -= LDBL_TRUE_MIN;
if (ihx < 0x0360000000000000LL
|| (hx > 0 && lx <= 0)
|| (hx < 0 && lx > 1)) {
@ -115,14 +116,14 @@ long double __nextafterl(long double x, long double y)
}
if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */
u = math_opt_barrier (x);
x += __LDBL_DENORM_MIN__;
x += LDBL_TRUE_MIN;
if (ihx < 0x0360000000000000LL
|| (hx > 0 && lx < 0 && lx != 0x8000000000000001LL)
|| (hx < 0 && lx >= 0)) {
u = u * u;
math_force_eval (u); /* raise underflow flag */
}
if (x == 0.0L) /* handle negative __LDBL_DENORM_MIN__ case */
if (x == 0.0L) /* handle negative LDBL_TRUE_MIN case */
x = -0.0L;
return x;
}

2
sysdeps/ieee754/ldbl-96/s_fmal.c
View File

@ -68,7 +68,7 @@ __fmal (long double x, long double y, long double z)
if (u.ieee.exponent + v.ieee.exponent
> 0x7fff + IEEE854_LONG_DOUBLE_BIAS)
return x * y;
/* If x * y is less than 1/4 of LDBL_DENORM_MIN, neither the
/* If x * y is less than 1/4 of LDBL_TRUE_MIN, neither the
result nor whether there is underflow depends on its exact
value, only on its sign. */
if (u.ieee.exponent + v.ieee.exponent