On 01/06/2020 21:35, Vineet Gupta wrote:
> ---
> sysdeps/generic/math-use-builtins.h | 5 +++++
> sysdeps/ieee754/dbl-64/s_fma.c | 6 ++++++
> sysdeps/ieee754/dbl-64/s_fmaf.c | 6 ++++++
> sysdeps/ieee754/float128/float128_private.h | 2 ++
> sysdeps/ieee754/ldbl-128/s_fmal.c | 5 +++++
> 5 files changed, 24 insertions(+)
LGTM with s390 fix pointed by Stefan.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@xxxxxxxxxx>
>
> diff --git a/sysdeps/generic/math-use-builtins.h b/sysdeps/generic/math-use-builtins.h
> index fc724c824a17..cf25ed8a2138 100644
> --- a/sysdeps/generic/math-use-builtins.h
> +++ b/sysdeps/generic/math-use-builtins.h
> @@ -63,4 +63,9 @@
> #define USE_SQRT_BUILTIN 0
> #define USE_SQRTF_BUILTIN 0
>
> +#define USE_FMA_BUILTIN 0
> +#define USE_FMAF_BUILTIN 0
> +#define USE_FMAL_BUILTIN 0
> +#define USE_FMAF128_BUILTIN 0
> +
> #endif /* math-use-builtins.h */
> diff --git a/sysdeps/ieee754/dbl-64/s_fma.c b/sysdeps/ieee754/dbl-64/s_fma.c
> index 876df6e78bdc..9dc5b132b9ee 100644
> --- a/sysdeps/ieee754/dbl-64/s_fma.c
> +++ b/sysdeps/ieee754/dbl-64/s_fma.c
> @@ -25,6 +25,7 @@
> #include <fenv_private.h>
> #include <libm-alias-double.h>
> #include <tininess.h>
> +#include <math-use-builtins.h>
>
> /* This implementation uses rounding to odd to avoid problems with
> double rounding. See a paper by Boldo and Melquiond:
> @@ -33,6 +34,10 @@
> double
> __fma (double x, double y, double z)
> {
> +#if USE_FMA_BUILTIN
> + return __builtin_fma (x, y, z);
> +#else
> + /* Use generic implementation. */
> union ieee754_double u, v, w;
> int adjust = 0;
> u.d = x;
> @@ -292,6 +297,7 @@ __fma (double x, double y, double z)
> v.ieee.mantissa1 |= j;
> return v.d * 0x1p-108;
> }
> +#endif /* ! USE_FMA_BUILTIN */
> }
> #ifndef __fma
> libm_alias_double (__fma, fma)
> diff --git a/sysdeps/ieee754/dbl-64/s_fmaf.c b/sysdeps/ieee754/dbl-64/s_fmaf.c
> index 57329d0a87fe..93b8660d5242 100644
> --- a/sysdeps/ieee754/dbl-64/s_fmaf.c
> +++ b/sysdeps/ieee754/dbl-64/s_fmaf.c
> @@ -23,6 +23,7 @@
> #include <math-barriers.h>
> #include <fenv_private.h>
> #include <libm-alias-float.h>
> +#include <math-use-builtins.h>
>
> /* This implementation relies on double being more than twice as
> precise as float and uses rounding to odd in order to avoid problems
> @@ -33,6 +34,10 @@
> float
> __fmaf (float x, float y, float z)
> {
> +#if USE_FMAF_BUILTIN
> + return __builtin_fmaf (x, y, z);
> +#else
> + /* Use generic implementation. */
> fenv_t env;
>
> /* Multiplication is always exact. */
> @@ -60,6 +65,7 @@ __fmaf (float x, float y, float z)
>
> /* And finally truncation with round to nearest. */
> return (float) u.d;
> +#endif /* ! USE_FMAF_BUILTIN */
> }
> #ifndef __fmaf
> libm_alias_float (__fma, fma)
> diff --git a/sysdeps/ieee754/float128/float128_private.h b/sysdeps/ieee754/float128/float128_private.h
> index f97463d9dc1b..ab6fc9f3c9cf 100644
> --- a/sysdeps/ieee754/float128/float128_private.h
> +++ b/sysdeps/ieee754/float128/float128_private.h
> @@ -154,6 +154,8 @@
> #define USE_ROUNDL_BUILTIN USE_ROUNDF128_BUILTIN
> #undef USE_COPYSIGNL_BUILTIN
> #define USE_COPYSIGNL_BUILTIN USE_COPYSIGNF128_BUILTIN
> +#undef USE_FMAL_BUILTIN
> +#define USE_FMAL_BUILTIN USE_FMAF128_BUILTIN
>
> /* IEEE function renames. */
> #define __ieee754_acoshl __ieee754_acoshf128
> diff --git a/sysdeps/ieee754/ldbl-128/s_fmal.c b/sysdeps/ieee754/ldbl-128/s_fmal.c
> index 7475015bcec6..a610499e47c7 100644
> --- a/sysdeps/ieee754/ldbl-128/s_fmal.c
> +++ b/sysdeps/ieee754/ldbl-128/s_fmal.c
> @@ -25,6 +25,7 @@
> #include <math_private.h>
> #include <libm-alias-ldouble.h>
> #include <tininess.h>
> +#include <math-use-builtins.h>
>
> /* This implementation uses rounding to odd to avoid problems with
> double rounding. See a paper by Boldo and Melquiond:
> @@ -33,6 +34,9 @@
> _Float128
> __fmal (_Float128 x, _Float128 y, _Float128 z)
> {
> +#if USE_FMAL_BUILTIN
> + return __builtin_fmal (x, y, z);
> +#else
> union ieee854_long_double u, v, w;
> int adjust = 0;
> u.d = x;
> @@ -296,5 +300,6 @@ __fmal (_Float128 x, _Float128 y, _Float128 z)
> v.ieee.mantissa3 |= j;
> return v.d * L(0x1p-228);
> }
> +#endif /* ! USE_FMAL_BUILTIN */
> }
> libm_alias_ldouble (__fma, fma)
>
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