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Re: [PATCH v2 08/18] Use GCC builtins for rint functions if desired.
On 09/12/2019 09:45, Stefan Liebler wrote:
> This patch is using the corresponding GCC builtin for rintf, rint,
> rintl and rintf128 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.
LGTM, thanks.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
> ---
> sysdeps/generic/math-use-builtins.h | 5 +++++
> sysdeps/ieee754/dbl-64/s_rint.c | 17 +++++++++++------
> sysdeps/ieee754/float128/float128_private.h | 3 +++
> sysdeps/ieee754/flt-32/s_rintf.c | 17 +++++++++++------
> sysdeps/ieee754/ldbl-128/s_rintl.c | 17 +++++++++++------
> sysdeps/s390/fpu/math-use-builtins.h | 11 +++++++++++
> 6 files changed, 52 insertions(+), 18 deletions(-)
>
> diff --git a/sysdeps/generic/math-use-builtins.h b/sysdeps/generic/math-use-builtins.h
> index e12490ed41..64b4a4bb5b 100644
> --- a/sysdeps/generic/math-use-builtins.h
> +++ b/sysdeps/generic/math-use-builtins.h
> @@ -26,4 +26,9 @@
> #define USE_NEARBYINTL_BUILTIN 0
> #define USE_NEARBYINTF128_BUILTIN 0
>
> +#define USE_RINT_BUILTIN 0
> +#define USE_RINTF_BUILTIN 0
> +#define USE_RINTL_BUILTIN 0
> +#define USE_RINTF128_BUILTIN 0
> +
> #endif /* math-use-builtins.h */
Ok.
> diff --git a/sysdeps/ieee754/dbl-64/s_rint.c b/sysdeps/ieee754/dbl-64/s_rint.c
> index 66c9196473..8604733ef9 100644
> --- a/sysdeps/ieee754/dbl-64/s_rint.c
> +++ b/sysdeps/ieee754/dbl-64/s_rint.c
> @@ -23,16 +23,20 @@
> #include <math.h>
> #include <math_private.h>
> #include <libm-alias-double.h>
> -
> -static const double
> -TWO52[2] = {
> - 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
> - -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
> -};
> +#include <math-use-builtins.h>
>
> double
> __rint (double x)
> {
> +#if USE_RINT_BUILTIN
> + return __builtin_rint (x);
> +#else
> + /* Use generic implementation. */
> + static const double
> + TWO52[2] = {
> + 4.50359962737049600000e+15, /* 0x43300000, 0x00000000 */
> + -4.50359962737049600000e+15, /* 0xC3300000, 0x00000000 */
> + };
> int64_t i0, sx;
> int32_t j0;
> EXTRACT_WORDS64 (i0, x);
> @@ -59,6 +63,7 @@ __rint (double x)
> }
> double w = TWO52[sx] + x;
> return w - TWO52[sx];
> +#endif /* ! USE_RINT_BUILTIN */
> }
> #ifndef __rint
> libm_alias_double (__rint, rint)
Ok.
> diff --git a/sysdeps/ieee754/float128/float128_private.h b/sysdeps/ieee754/float128/float128_private.h
> index e96986a968..f458e7b85f 100644
> --- a/sysdeps/ieee754/float128/float128_private.h
> +++ b/sysdeps/ieee754/float128/float128_private.h
> @@ -142,6 +142,8 @@
> #include <math-use-builtins.h>
> #undef USE_NEARBYINTL_BUILTIN
> #define USE_NEARBYINTL_BUILTIN USE_NEARBYINTF128_BUILTIN
> +#undef USE_RINTL_BUILTIN
> +#define USE_RINTL_BUILTIN USE_RINTF128_BUILTIN
>
> /* IEEE function renames. */
> #define __ieee754_acoshl __ieee754_acoshf128
> @@ -346,6 +348,7 @@
> #define __builtin_copysignl __builtin_copysignf128
> #define __builtin_signbitl __builtin_signbit
> #define __builtin_nearbyintl __builtin_nearbyintf128
> +#define __builtin_rintl __builtin_rintf128
>
> /* Get the constant suffix from bits/floatn-compat.h. */
> #define L(x) __f128 (x)
Ok.
> diff --git a/sysdeps/ieee754/flt-32/s_rintf.c b/sysdeps/ieee754/flt-32/s_rintf.c
> index 0306dc21f4..34c16ea164 100644
> --- a/sysdeps/ieee754/flt-32/s_rintf.c
> +++ b/sysdeps/ieee754/flt-32/s_rintf.c
> @@ -17,16 +17,20 @@
> #include <math.h>
> #include <math_private.h>
> #include <libm-alias-float.h>
> -
> -static const float
> -TWO23[2]={
> - 8.3886080000e+06, /* 0x4b000000 */
> - -8.3886080000e+06, /* 0xcb000000 */
> -};
> +#include <math-use-builtins.h>
>
> float
> __rintf(float x)
> {
> +#if USE_RINTF_BUILTIN
> + return __builtin_rintf (x);
> +#else
> + /* Use generic implementation. */
> + static const float
> + TWO23[2] = {
> + 8.3886080000e+06, /* 0x4b000000 */
> + -8.3886080000e+06, /* 0xcb000000 */
> + };
> int32_t i0,j0,sx;
> float w,t;
> GET_FLOAT_WORD(i0,x);
> @@ -46,6 +50,7 @@ __rintf(float x)
> }
> w = TWO23[sx]+x;
> return w-TWO23[sx];
> +#endif /* ! USE_RINTF_BUILTIN */
> }
> #ifndef __rintf
> libm_alias_float (__rint, rint)
Ok.
> diff --git a/sysdeps/ieee754/ldbl-128/s_rintl.c b/sysdeps/ieee754/ldbl-128/s_rintl.c
> index b6337e1d8a..3340c35ee1 100644
> --- a/sysdeps/ieee754/ldbl-128/s_rintl.c
> +++ b/sysdeps/ieee754/ldbl-128/s_rintl.c
> @@ -31,15 +31,19 @@ static char rcsid[] = "$NetBSD: $";
> #include <math.h>
> #include <math_private.h>
> #include <libm-alias-ldouble.h>
> -
> -static const _Float128
> -TWO112[2]={
> - 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
> - -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
> -};
> +#include <math-use-builtins.h>
>
> _Float128 __rintl(_Float128 x)
> {
> +#if USE_RINTL_BUILTIN
> + return __builtin_rintl (x);
> +#else
> + /* Use generic implementation. */
> + static const _Float128
> + TWO112[2] = {
> + 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */
> + -5.19229685853482762853049632922009600E+33L /* 0xC06F000000000000, 0 */
> + };
> int64_t i0,j0,sx;
> uint64_t i1 __attribute__ ((unused));
> _Float128 w,t;
> @@ -60,5 +64,6 @@ _Float128 __rintl(_Float128 x)
> }
> w = TWO112[sx]+x;
> return w-TWO112[sx];
> +#endif /* ! USE_RINTL_BUILTIN */
> }
> libm_alias_ldouble (__rint, rint)
Ok.
> diff --git a/sysdeps/s390/fpu/math-use-builtins.h b/sysdeps/s390/fpu/math-use-builtins.h
> index 7abbfb3b50..8b702a6a90 100644
> --- a/sysdeps/s390/fpu/math-use-builtins.h
> +++ b/sysdeps/s390/fpu/math-use-builtins.h
> @@ -30,10 +30,16 @@
> # define USE_NEARBYINTF_BUILTIN 1
> # define USE_NEARBYINTL_BUILTIN 1
>
> +# define USE_RINT_BUILTIN 1
> +# define USE_RINTF_BUILTIN 1
> +# define USE_RINTL_BUILTIN 1
> +
> # if __GNUC_PREREQ (8, 0)
> # define USE_NEARBYINTF128_BUILTIN 1
> +# define USE_RINTF128_BUILTIN 1
> # else
> # define USE_NEARBYINTF128_BUILTIN 0
> +# define USE_RINTF128_BUILTIN 0
> # endif
>
> #else
> @@ -44,6 +50,11 @@
> # define USE_NEARBYINTL_BUILTIN 0
> # define USE_NEARBYINTF128_BUILTIN 0
>
> +# define USE_RINT_BUILTIN 0
> +# define USE_RINTF_BUILTIN 0
> +# define USE_RINTL_BUILTIN 0
> +# define USE_RINTF128_BUILTIN 0
> +
> #endif /* ! HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT */
>
> #endif /* math-use-builtins.h */
>
Ok.