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Use GCC builtins for floor functions if desired.

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This patch is using the corresponding GCC builtin for floorf, floor,
floorl and floorf128 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 15:09:20 +01:00
parent a2a9b00429
commit 6c1b6a5e8c
6 changed files with 37 additions and 0 deletions
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5
sysdeps/generic/math-use-builtins.h
View File

@@ -31,4 +31,9 @@
#define USE_RINTL_BUILTIN 0 #define USE_RINTL_BUILTIN 0
#define USE_RINTF128_BUILTIN 0 #define USE_RINTF128_BUILTIN 0
#define USE_FLOOR_BUILTIN 0
#define USE_FLOORF_BUILTIN 0
#define USE_FLOORL_BUILTIN 0
#define USE_FLOORF128_BUILTIN 0
#endif /* math-use-builtins.h */ #endif /* math-use-builtins.h */

6
sysdeps/ieee754/dbl-64/s_floor.c
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@@ -35,6 +35,7 @@
#include <math_private.h> #include <math_private.h>
#include <stdint.h> #include <stdint.h>
#include <libm-alias-double.h> #include <libm-alias-double.h>
#include <math-use-builtins.h>
/* /*
* floor(x) * floor(x)
@@ -47,6 +48,10 @@
double double
__floor (double x) __floor (double x)
{ {
#if USE_FLOOR_BUILTIN
return __builtin_floor (x);
#else
/* Use generic implementation. */
int64_t i0; int64_t i0;
EXTRACT_WORDS64 (i0, x); EXTRACT_WORDS64 (i0, x);
int32_t j0 = ((i0 >> 52) & 0x7ff) - 0x3ff; int32_t j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
@@ -74,6 +79,7 @@ __floor (double x)
else if (j0 == 0x400) else if (j0 == 0x400)
return x + x; /* inf or NaN */ return x + x; /* inf or NaN */
return x; return x;
#endif /* ! USE_FLOOR_BUILTIN */
} }
#ifndef __floor #ifndef __floor
libm_alias_double (__floor, floor) libm_alias_double (__floor, floor)

3
sysdeps/ieee754/float128/float128_private.h
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@@ -144,6 +144,8 @@
#define USE_NEARBYINTL_BUILTIN USE_NEARBYINTF128_BUILTIN #define USE_NEARBYINTL_BUILTIN USE_NEARBYINTF128_BUILTIN
#undef USE_RINTL_BUILTIN #undef USE_RINTL_BUILTIN
#define USE_RINTL_BUILTIN USE_RINTF128_BUILTIN #define USE_RINTL_BUILTIN USE_RINTF128_BUILTIN
#undef USE_FLOORL_BUILTIN
#define USE_FLOORL_BUILTIN USE_FLOORF128_BUILTIN
/* IEEE function renames. */ /* IEEE function renames. */
#define __ieee754_acoshl __ieee754_acoshf128 #define __ieee754_acoshl __ieee754_acoshf128
@@ -349,6 +351,7 @@
#define __builtin_signbitl __builtin_signbit #define __builtin_signbitl __builtin_signbit
#define __builtin_nearbyintl __builtin_nearbyintf128 #define __builtin_nearbyintl __builtin_nearbyintf128
#define __builtin_rintl __builtin_rintf128 #define __builtin_rintl __builtin_rintf128
#define __builtin_floorl __builtin_floorf128
/* Get the constant suffix from bits/floatn-compat.h. */ /* Get the constant suffix from bits/floatn-compat.h. */
#define L(x) __f128 (x) #define L(x) __f128 (x)

6
sysdeps/ieee754/flt-32/s_floorf.c
View File

@@ -24,10 +24,15 @@
#include <math.h> #include <math.h>
#include <math_private.h> #include <math_private.h>
#include <libm-alias-float.h> #include <libm-alias-float.h>
#include <math-use-builtins.h>
float float
__floorf(float x) __floorf(float x)
{ {
#if USE_FLOORF_BUILTIN
return __builtin_floorf (x);
#else
/* Use generic implementation. */
int32_t i0,j0; int32_t i0,j0;
uint32_t i; uint32_t i;
GET_FLOAT_WORD(i0,x); GET_FLOAT_WORD(i0,x);
@@ -50,6 +55,7 @@ __floorf(float x)
} }
SET_FLOAT_WORD(x,i0); SET_FLOAT_WORD(x,i0);
return x; return x;
#endif /* ! USE_FLOORF_BUILTIN */
} }
#ifndef __floorf #ifndef __floorf
libm_alias_float (__floor, floor) libm_alias_float (__floor, floor)

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

@@ -28,9 +28,14 @@ static char rcsid[] = "$NetBSD: $";
#include <math.h> #include <math.h>
#include <math_private.h> #include <math_private.h>
#include <libm-alias-ldouble.h> #include <libm-alias-ldouble.h>
#include <math-use-builtins.h>
_Float128 __floorl(_Float128 x) _Float128 __floorl(_Float128 x)
{ {
#if USE_FLOORL_BUILTIN
return __builtin_floorl (x);
#else
/* Use generic implementation. */
int64_t i0,i1,j0; int64_t i0,i1,j0;
uint64_t i,j; uint64_t i,j;
GET_LDOUBLE_WORDS64(i0,i1,x); GET_LDOUBLE_WORDS64(i0,i1,x);
@@ -65,5 +70,6 @@ _Float128 __floorl(_Float128 x)
} }
SET_LDOUBLE_WORDS64(x,i0,i1); SET_LDOUBLE_WORDS64(x,i0,i1);
return x; return x;
#endif /* ! USE_FLOORL_BUILTIN */
} }
libm_alias_ldouble (__floor, floor) libm_alias_ldouble (__floor, floor)

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

@@ -34,12 +34,18 @@
# define USE_RINTF_BUILTIN 1 # define USE_RINTF_BUILTIN 1
# define USE_RINTL_BUILTIN 1 # define USE_RINTL_BUILTIN 1
# define USE_FLOOR_BUILTIN 1
# define USE_FLOORF_BUILTIN 1
# define USE_FLOORL_BUILTIN 1
# if __GNUC_PREREQ (8, 0) # if __GNUC_PREREQ (8, 0)
# define USE_NEARBYINTF128_BUILTIN 1 # define USE_NEARBYINTF128_BUILTIN 1
# define USE_RINTF128_BUILTIN 1 # define USE_RINTF128_BUILTIN 1
# define USE_FLOORF128_BUILTIN 1
# else # else
# define USE_NEARBYINTF128_BUILTIN 0 # define USE_NEARBYINTF128_BUILTIN 0
# define USE_RINTF128_BUILTIN 0 # define USE_RINTF128_BUILTIN 0
# define USE_FLOORF128_BUILTIN 0
# endif # endif
#else #else
@@ -55,6 +61,11 @@
# define USE_RINTL_BUILTIN 0 # define USE_RINTL_BUILTIN 0
# define USE_RINTF128_BUILTIN 0 # define USE_RINTF128_BUILTIN 0
# define USE_FLOOR_BUILTIN 0
# define USE_FLOORF_BUILTIN 0
# define USE_FLOORL_BUILTIN 0
# define USE_FLOORF128_BUILTIN 0
#endif /* ! HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT */ #endif /* ! HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT */
#endif /* math-use-builtins.h */ #endif /* math-use-builtins.h */