[v2,11/18] Use GCC builtins for trunc functions if desired.
Commit Message
This patch is using the corresponding GCC builtin for truncf, trunc,
truncl and truncf128 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.
---
sysdeps/generic/math-use-builtins.h | 5 +++++
sysdeps/ieee754/dbl-64/s_trunc.c | 6 ++++++
sysdeps/ieee754/float128/float128_private.h | 3 +++
sysdeps/ieee754/flt-32/s_truncf.c | 6 ++++++
sysdeps/ieee754/ldbl-128/s_truncl.c | 6 ++++++
sysdeps/s390/fpu/math-use-builtins.h | 11 +++++++++++
6 files changed, 37 insertions(+)
Comments
On 09/12/2019 09:46, Stefan Liebler wrote:
> This patch is using the corresponding GCC builtin for truncf, trunc,
> truncl and truncf128 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_trunc.c | 6 ++++++
> sysdeps/ieee754/float128/float128_private.h | 3 +++
> sysdeps/ieee754/flt-32/s_truncf.c | 6 ++++++
> sysdeps/ieee754/ldbl-128/s_truncl.c | 6 ++++++
> sysdeps/s390/fpu/math-use-builtins.h | 11 +++++++++++
> 6 files changed, 37 insertions(+)
>
> diff --git a/sysdeps/generic/math-use-builtins.h b/sysdeps/generic/math-use-builtins.h
> index 076ec661b0..ab379f45ba 100644
> --- a/sysdeps/generic/math-use-builtins.h
> +++ b/sysdeps/generic/math-use-builtins.h
> @@ -41,4 +41,9 @@
> #define USE_CEILL_BUILTIN 0
> #define USE_CEILF128_BUILTIN 0
>
> +#define USE_TRUNC_BUILTIN 0
> +#define USE_TRUNCF_BUILTIN 0
> +#define USE_TRUNCL_BUILTIN 0
> +#define USE_TRUNCF128_BUILTIN 0
> +
> #endif /* math-use-builtins.h */
OK.
> diff --git a/sysdeps/ieee754/dbl-64/s_trunc.c b/sysdeps/ieee754/dbl-64/s_trunc.c
> index 0de68ce298..c3129fea7b 100644
> --- a/sysdeps/ieee754/dbl-64/s_trunc.c
> +++ b/sysdeps/ieee754/dbl-64/s_trunc.c
> @@ -22,11 +22,16 @@
>
> #include <math_private.h>
> #include <libm-alias-double.h>
> +#include <math-use-builtins.h>
>
>
> double
> __trunc (double x)
> {
> +#if USE_TRUNC_BUILTIN
> + return __builtin_trunc (x);
> +#else
> + /* Use generic implementation. */
> int64_t i0, j0;
> int64_t sx;
>
> @@ -49,6 +54,7 @@ __trunc (double x)
> }
>
> return x;
> +#endif /* ! USE_TRUNC_BUILTIN */
> }
> #ifndef __trunc
> libm_alias_double (__trunc, trunc)
Ok.
> diff --git a/sysdeps/ieee754/float128/float128_private.h b/sysdeps/ieee754/float128/float128_private.h
> index 01881b574a..9cd3a63f11 100644
> --- a/sysdeps/ieee754/float128/float128_private.h
> +++ b/sysdeps/ieee754/float128/float128_private.h
> @@ -148,6 +148,8 @@
> #define USE_FLOORL_BUILTIN USE_FLOORF128_BUILTIN
> #undef USE_CEILL_BUILTIN
> #define USE_CEILL_BUILTIN USE_CEILF128_BUILTIN
> +#undef USE_TRUNCL_BUILTIN
> +#define USE_TRUNCL_BUILTIN USE_TRUNCF128_BUILTIN
>
> /* IEEE function renames. */
> #define __ieee754_acoshl __ieee754_acoshf128
> @@ -355,6 +357,7 @@
> #define __builtin_rintl __builtin_rintf128
> #define __builtin_floorl __builtin_floorf128
> #define __builtin_ceill __builtin_ceilf128
> +#define __builtin_truncl __builtin_truncf128
>
> /* Get the constant suffix from bits/floatn-compat.h. */
> #define L(x) __f128 (x)
Ok.
> diff --git a/sysdeps/ieee754/flt-32/s_truncf.c b/sysdeps/ieee754/flt-32/s_truncf.c
> index e587706b5b..274638820e 100644
> --- a/sysdeps/ieee754/flt-32/s_truncf.c
> +++ b/sysdeps/ieee754/flt-32/s_truncf.c
> @@ -22,11 +22,16 @@
>
> #include <math_private.h>
> #include <libm-alias-float.h>
> +#include <math-use-builtins.h>
>
>
> float
> __truncf (float x)
> {
> +#if USE_TRUNCF_BUILTIN
> + return __builtin_truncf (x);
> +#else
> + /* Use generic implementation. */
> int32_t i0, j0;
> int sx;
>
> @@ -49,6 +54,7 @@ __truncf (float x)
> }
>
> return x;
> +#endif /* ! USE_TRUNCF_BUILTIN */
> }
> #ifndef __truncf
> libm_alias_float (__trunc, trunc)
Ok.
> diff --git a/sysdeps/ieee754/ldbl-128/s_truncl.c b/sysdeps/ieee754/ldbl-128/s_truncl.c
> index de4dd34d59..d11ab937e2 100644
> --- a/sysdeps/ieee754/ldbl-128/s_truncl.c
> +++ b/sysdeps/ieee754/ldbl-128/s_truncl.c
> @@ -23,11 +23,16 @@
>
> #include <math_private.h>
> #include <libm-alias-ldouble.h>
> +#include <math-use-builtins.h>
>
>
> _Float128
> __truncl (_Float128 x)
> {
> +#if USE_TRUNCL_BUILTIN
> + return __builtin_truncl (x);
> +#else
> + /* Use generic implementation. */
> int32_t j0;
> uint64_t i0, i1, sx;
>
> @@ -54,5 +59,6 @@ __truncl (_Float128 x)
> }
>
> return x;
> +#endif /* ! USE_TRUNCL_BUILTIN */
> }
> libm_alias_ldouble (__trunc, trunc)
Ok.
> diff --git a/sysdeps/s390/fpu/math-use-builtins.h b/sysdeps/s390/fpu/math-use-builtins.h
> index 5435cbb65f..a39715c612 100644
> --- a/sysdeps/s390/fpu/math-use-builtins.h
> +++ b/sysdeps/s390/fpu/math-use-builtins.h
> @@ -42,16 +42,22 @@
> # define USE_CEILF_BUILTIN 1
> # define USE_CEILL_BUILTIN 1
>
> +# define USE_TRUNC_BUILTIN 1
> +# define USE_TRUNCF_BUILTIN 1
> +# define USE_TRUNCL_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
> +# define USE_TRUNCF128_BUILTIN 1
> # else
> # define USE_NEARBYINTF128_BUILTIN 0
> # define USE_RINTF128_BUILTIN 0
> # define USE_FLOORF128_BUILTIN 0
> # define USE_CEILF128_BUILTIN 0
> +# define USE_TRUNCF128_BUILTIN 0
> # endif
>
> #else
> @@ -77,6 +83,11 @@
> # define USE_CEILL_BUILTIN 0
> # define USE_CEILF128_BUILTIN 0
>
> +# define USE_TRUNC_BUILTIN 0
> +# define USE_TRUNCF_BUILTIN 0
> +# define USE_TRUNCL_BUILTIN 0
> +# define USE_TRUNCF128_BUILTIN 0
> +
> #endif /* ! HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT */
>
> #endif /* math-use-builtins.h */
>
Ok.
@@ -41,4 +41,9 @@
#define USE_CEILL_BUILTIN 0
#define USE_CEILF128_BUILTIN 0
+#define USE_TRUNC_BUILTIN 0
+#define USE_TRUNCF_BUILTIN 0
+#define USE_TRUNCL_BUILTIN 0
+#define USE_TRUNCF128_BUILTIN 0
+
#endif /* math-use-builtins.h */
@@ -22,11 +22,16 @@
#include <math_private.h>
#include <libm-alias-double.h>
+#include <math-use-builtins.h>
double
__trunc (double x)
{
+#if USE_TRUNC_BUILTIN
+ return __builtin_trunc (x);
+#else
+ /* Use generic implementation. */
int64_t i0, j0;
int64_t sx;
@@ -49,6 +54,7 @@ __trunc (double x)
}
return x;
+#endif /* ! USE_TRUNC_BUILTIN */
}
#ifndef __trunc
libm_alias_double (__trunc, trunc)
@@ -148,6 +148,8 @@
#define USE_FLOORL_BUILTIN USE_FLOORF128_BUILTIN
#undef USE_CEILL_BUILTIN
#define USE_CEILL_BUILTIN USE_CEILF128_BUILTIN
+#undef USE_TRUNCL_BUILTIN
+#define USE_TRUNCL_BUILTIN USE_TRUNCF128_BUILTIN
/* IEEE function renames. */
#define __ieee754_acoshl __ieee754_acoshf128
@@ -355,6 +357,7 @@
#define __builtin_rintl __builtin_rintf128
#define __builtin_floorl __builtin_floorf128
#define __builtin_ceill __builtin_ceilf128
+#define __builtin_truncl __builtin_truncf128
/* Get the constant suffix from bits/floatn-compat.h. */
#define L(x) __f128 (x)
@@ -22,11 +22,16 @@
#include <math_private.h>
#include <libm-alias-float.h>
+#include <math-use-builtins.h>
float
__truncf (float x)
{
+#if USE_TRUNCF_BUILTIN
+ return __builtin_truncf (x);
+#else
+ /* Use generic implementation. */
int32_t i0, j0;
int sx;
@@ -49,6 +54,7 @@ __truncf (float x)
}
return x;
+#endif /* ! USE_TRUNCF_BUILTIN */
}
#ifndef __truncf
libm_alias_float (__trunc, trunc)
@@ -23,11 +23,16 @@
#include <math_private.h>
#include <libm-alias-ldouble.h>
+#include <math-use-builtins.h>
_Float128
__truncl (_Float128 x)
{
+#if USE_TRUNCL_BUILTIN
+ return __builtin_truncl (x);
+#else
+ /* Use generic implementation. */
int32_t j0;
uint64_t i0, i1, sx;
@@ -54,5 +59,6 @@ __truncl (_Float128 x)
}
return x;
+#endif /* ! USE_TRUNCL_BUILTIN */
}
libm_alias_ldouble (__trunc, trunc)
@@ -42,16 +42,22 @@
# define USE_CEILF_BUILTIN 1
# define USE_CEILL_BUILTIN 1
+# define USE_TRUNC_BUILTIN 1
+# define USE_TRUNCF_BUILTIN 1
+# define USE_TRUNCL_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
+# define USE_TRUNCF128_BUILTIN 1
# else
# define USE_NEARBYINTF128_BUILTIN 0
# define USE_RINTF128_BUILTIN 0
# define USE_FLOORF128_BUILTIN 0
# define USE_CEILF128_BUILTIN 0
+# define USE_TRUNCF128_BUILTIN 0
# endif
#else
@@ -77,6 +83,11 @@
# define USE_CEILL_BUILTIN 0
# define USE_CEILF128_BUILTIN 0
+# define USE_TRUNC_BUILTIN 0
+# define USE_TRUNCF_BUILTIN 0
+# define USE_TRUNCL_BUILTIN 0
+# define USE_TRUNCF128_BUILTIN 0
+
#endif /* ! HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT */
#endif /* math-use-builtins.h */