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Use GCC builtins for ceil functions if desired.

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This patch is using the corresponding GCC builtin for ceilf, ceil,
ceill and ceilf128 if the USE_FUNCTION_BUILTIN macros are defined to one
in math-use-builtins.h.

This is the case for s390 if build with at least --march=z196 --mzarch.
Otherwise the generic implementation is used.  The code of the generic
implementation is not changed.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
This commit is contained in:
Stefan Liebler 2019-12-11 15:09:21 +01:00
parent 6c1b6a5e8c
commit 62560ee840
6 changed files with 37 additions and 1 deletions
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5
sysdeps/generic/math-use-builtins.h
View File

@ -36,4 +36,9 @@
#define USE_FLOORL_BUILTIN 0
#define USE_FLOORF128_BUILTIN 0
#define USE_CEIL_BUILTIN 0
#define USE_CEILF_BUILTIN 0
#define USE_CEILL_BUILTIN 0
#define USE_CEILF128_BUILTIN 0
#endif /* math-use-builtins.h */

6
sysdeps/ieee754/dbl-64/s_ceil.c
View File

@ -21,10 +21,15 @@
#include <math.h>
#include <math_private.h>
#include <libm-alias-double.h>
#include <math-use-builtins.h>
double
__ceil (double x)
{
#if USE_CEIL_BUILTIN
return __builtin_ceil (x);
#else
/* Use generic implementation. */
int64_t i0, i;
int32_t j0;
EXTRACT_WORDS64 (i0, x);
@ -58,6 +63,7 @@ __ceil (double x)
}
INSERT_WORDS64 (x, i0);
return x;
#endif /* ! USE_CEIL_BUILTIN */
}
#ifndef __ceil
libm_alias_double (__ceil, ceil)

3
sysdeps/ieee754/float128/float128_private.h
View File

@ -146,6 +146,8 @@
#define USE_RINTL_BUILTIN USE_RINTF128_BUILTIN
#undef USE_FLOORL_BUILTIN
#define USE_FLOORL_BUILTIN USE_FLOORF128_BUILTIN
#undef USE_CEILL_BUILTIN
#define USE_CEILL_BUILTIN USE_CEILF128_BUILTIN
/* IEEE function renames. */
#define __ieee754_acoshl __ieee754_acoshf128
@ -352,6 +354,7 @@
#define __builtin_nearbyintl __builtin_nearbyintf128
#define __builtin_rintl __builtin_rintf128
#define __builtin_floorl __builtin_floorf128
#define __builtin_ceill __builtin_ceilf128
/* Get the constant suffix from bits/floatn-compat.h. */
#define L(x) __f128 (x)

7
sysdeps/ieee754/flt-32/s_ceilf.c
View File

@ -17,11 +17,15 @@
#include <math.h>
#include <math_private.h>
#include <libm-alias-float.h>
#include <math-use-builtins.h>
float
__ceilf(float x)
{
#if USE_CEILF_BUILTIN
return __builtin_ceilf (x);
#else
/* Use generic implementation. */
int32_t i0,j0;
uint32_t i;
@ -44,6 +48,7 @@ __ceilf(float x)
}
SET_FLOAT_WORD(x,i0);
return x;
#endif /* ! USE_CEILF_BUILTIN */
}
#ifndef __ceilf
libm_alias_float (__ceil, ceil)

6
sysdeps/ieee754/ldbl-128/s_ceill.c
View File

@ -28,9 +28,14 @@ static char rcsid[] = "$NetBSD: $";
#include <math.h>
#include <math_private.h>
#include <libm-alias-ldouble.h>
#include <math-use-builtins.h>
_Float128 __ceill(_Float128 x)
{
#if USE_CEILL_BUILTIN
return __builtin_ceill (x);
#else
/* Use generic implementation. */
int64_t i0,i1,j0;
uint64_t i,j;
GET_LDOUBLE_WORDS64(i0,i1,x);
@ -64,5 +69,6 @@ _Float128 __ceill(_Float128 x)
}
SET_LDOUBLE_WORDS64(x,i0,i1);
return x;
#endif /* ! USE_CEILL_BUILTIN */
}
libm_alias_ldouble (__ceil, ceil)

11
sysdeps/s390/fpu/math-use-builtins.h
View File

@ -38,14 +38,20 @@
# define USE_FLOORF_BUILTIN 1
# define USE_FLOORL_BUILTIN 1
# define USE_CEIL_BUILTIN 1
# define USE_CEILF_BUILTIN 1
# define USE_CEILL_BUILTIN 1
# if __GNUC_PREREQ (8, 0)
# define USE_NEARBYINTF128_BUILTIN 1
# define USE_RINTF128_BUILTIN 1
# define USE_FLOORF128_BUILTIN 1
# define USE_CEILF128_BUILTIN 1
# else
# define USE_NEARBYINTF128_BUILTIN 0
# define USE_RINTF128_BUILTIN 0
# define USE_FLOORF128_BUILTIN 0
# define USE_CEILF128_BUILTIN 0
# endif
#else
@ -66,6 +72,11 @@
# define USE_FLOORL_BUILTIN 0
# define USE_FLOORF128_BUILTIN 0
# define USE_CEIL_BUILTIN 0
# define USE_CEILF_BUILTIN 0
# define USE_CEILL_BUILTIN 0
# define USE_CEILF128_BUILTIN 0
#endif /* ! HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT */
#endif /* math-use-builtins.h */