[PATCH v2 2/5] LoongArch: Add support for LA32 in sysdeps/loongarch/fpu
Adhemerval Zanella Netto
adhemerval.zanella@linaro.org
Thu Dec 18 13:15:35 GMT 2025
On 18/12/25 09:30, mengqinggang wrote:
> ---
> sysdeps/loongarch/fpu/e_scalb.c | 10 ++++++++++
> sysdeps/loongarch/fpu/e_scalbf.c | 10 ++++++++++
> sysdeps/loongarch/fpu/math-use-builtins-llrint.h | 2 +-
> sysdeps/loongarch/fpu/math-use-builtins-logb.h | 2 +-
> sysdeps/loongarch/fpu/math-use-builtins-lrint.h | 2 +-
> sysdeps/loongarch/fpu/math-use-builtins-rint.h | 2 +-
> sysdeps/loongarch/fpu/math-use-builtins-sqrt.h | 10 ++++++++--
> sysdeps/loongarch/fpu/s_scalbn.c | 10 ++++++++++
> sysdeps/loongarch/fpu/s_scalbnf.c | 8 ++++++++
> sysdeps/loongarch/fpu/w_ilogb-impl.h | 8 ++++++++
> sysdeps/loongarch/fpu/w_ilogbf-impl.h | 8 ++++++++
> 11 files changed, 66 insertions(+), 6 deletions(-)
>
> diff --git a/sysdeps/loongarch/fpu/e_scalb.c b/sysdeps/loongarch/fpu/e_scalb.c
> index 039cbd6ac8..439e38c6a7 100644
> --- a/sysdeps/loongarch/fpu/e_scalb.c
> +++ b/sysdeps/loongarch/fpu/e_scalb.c
> @@ -16,6 +16,8 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> +#ifdef __loongarch64
> +
> #define NO_MATH_REDIRECT
> #include <math.h>
> #include <libm-alias-finite.h>
> @@ -57,4 +59,12 @@ __ieee754_scalb (double x, double fn)
>
> return x;
> }
> +
> libm_alias_finite (__ieee754_scalb, __scalb)
> +
> +#else /* #ifdef __loongarch64 */
> +
> +#include <sysdeps/generic/math-type-macros-double.h>
> +#include <math/e_scalb_template.c>
> +
> +#endif /* #ifdef __loongarch64 */
I don't have a strong opinion, but maybe it would be better to add
an extra Implies subfolder like other ABIs that support multilib
and move the loongarch64 implementation to it:
sysdeps/loongarch/fpu/e_scalb.c -> sysdeps/loongarch/loongarch64/fpu/e_scalb.c
So the selection is done automatically instead adjust to use the
generic implementation on multiple files.
> diff --git a/sysdeps/loongarch/fpu/e_scalbf.c b/sysdeps/loongarch/fpu/e_scalbf.c
> index 4a4092cf40..c8196f7d6e 100644
> --- a/sysdeps/loongarch/fpu/e_scalbf.c
> +++ b/sysdeps/loongarch/fpu/e_scalbf.c
> @@ -16,6 +16,8 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> +#ifdef __loongarch64
> +
> #define NO_MATH_REDIRECT
> #include <math.h>
> #include <libm-alias-finite.h>
> @@ -57,4 +59,12 @@ __ieee754_scalbf (float x, float fn)
>
> return x;
> }
> +
> libm_alias_finite (__ieee754_scalbf, __scalbf)
> +
> +#else /* #ifdef __loongarch64 */
> +
> +#include <sysdeps/generic/math-type-macros-float.h>
> +#include <math/e_scalb_template.c>
> +
> +#endif /* #ifdef __loongarch64 */
> diff --git a/sysdeps/loongarch/fpu/math-use-builtins-llrint.h b/sysdeps/loongarch/fpu/math-use-builtins-llrint.h
> index bee5910b09..82f89d41f9 100644
> --- a/sysdeps/loongarch/fpu/math-use-builtins-llrint.h
> +++ b/sysdeps/loongarch/fpu/math-use-builtins-llrint.h
> @@ -1,4 +1,4 @@
> -#if __GNUC_PREREQ (13, 0)
> +#if __GNUC_PREREQ (13, 0) && __loongarch_grlen == 64
> # define USE_LLRINT_BUILTIN 1
> # define USE_LLRINTF_BUILTIN 1
> #else
> diff --git a/sysdeps/loongarch/fpu/math-use-builtins-logb.h b/sysdeps/loongarch/fpu/math-use-builtins-logb.h
> index b1c3f30dc4..d8ca3d1aa2 100644
> --- a/sysdeps/loongarch/fpu/math-use-builtins-logb.h
> +++ b/sysdeps/loongarch/fpu/math-use-builtins-logb.h
> @@ -1,4 +1,4 @@
> -#if __GNUC_PREREQ (13, 0)
> +#if __GNUC_PREREQ (13, 0) && __loongarch_grlen == 64
> # define USE_LOGB_BUILTIN 1
> # define USE_LOGBF_BUILTIN 1
> #else
> diff --git a/sysdeps/loongarch/fpu/math-use-builtins-lrint.h b/sysdeps/loongarch/fpu/math-use-builtins-lrint.h
> index 7df8aac81f..80345fdf3f 100644
> --- a/sysdeps/loongarch/fpu/math-use-builtins-lrint.h
> +++ b/sysdeps/loongarch/fpu/math-use-builtins-lrint.h
> @@ -1,4 +1,4 @@
> -#if __GNUC_PREREQ (13, 0)
> +#if __GNUC_PREREQ (13, 0) && __loongarch_grlen == 64
> # define USE_LRINT_BUILTIN 1
> # define USE_LRINTF_BUILTIN 1
> #else
> diff --git a/sysdeps/loongarch/fpu/math-use-builtins-rint.h b/sysdeps/loongarch/fpu/math-use-builtins-rint.h
> index cd91482f5f..73ce3e45bc 100644
> --- a/sysdeps/loongarch/fpu/math-use-builtins-rint.h
> +++ b/sysdeps/loongarch/fpu/math-use-builtins-rint.h
> @@ -1,4 +1,4 @@
> -#if __GNUC_PREREQ (13, 0)
> +#if __GNUC_PREREQ (13, 0) && __loongarch_grlen == 64
> # define USE_RINT_BUILTIN 1
> # define USE_RINTF_BUILTIN 1
> #else
> diff --git a/sysdeps/loongarch/fpu/math-use-builtins-sqrt.h b/sysdeps/loongarch/fpu/math-use-builtins-sqrt.h
> index e94c915ba6..f031bd7536 100644
> --- a/sysdeps/loongarch/fpu/math-use-builtins-sqrt.h
> +++ b/sysdeps/loongarch/fpu/math-use-builtins-sqrt.h
> @@ -1,4 +1,10 @@
> -#define USE_SQRT_BUILTIN 1
> -#define USE_SQRTF_BUILTIN 1
> +#if __loongarch_grlen == 64
> + #define USE_SQRT_BUILTIN 1
> + #define USE_SQRTF_BUILTIN 1
> +#else
> + #define USE_SQRT_BUILTIN 0
> + #define USE_SQRTF_BUILTIN 0
> +#endif
> +
> #define USE_SQRTL_BUILTIN 0
> #define USE_SQRTF128_BUILTIN 0
> diff --git a/sysdeps/loongarch/fpu/s_scalbn.c b/sysdeps/loongarch/fpu/s_scalbn.c
> index 34d4cd40a0..cff78c7965 100644
> --- a/sysdeps/loongarch/fpu/s_scalbn.c
> +++ b/sysdeps/loongarch/fpu/s_scalbn.c
> @@ -16,14 +16,24 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> +#ifdef __loongarch64
> +
> #define NO_MATH_REDIRECT
> #include <math.h>
>
> +/* Return x * 2^fn. */
> double
> __scalbn (double x, int fn)
> {
> double tmp;
> + /* Move fn to exp. */
> asm volatile ("movgr2fr.d \t%0, %1" : "=f" (tmp) : "r" (fn));
> asm volatile ("fscaleb.d \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (tmp));
> return x;
> }
> +
> +#else /* #ifdef __loongarch64 */
> +
> +#include <sysdeps/ieee754/dbl-64/s_scalbn.c>
> +
> +#endif /* #ifdef __loongarch64 */
> diff --git a/sysdeps/loongarch/fpu/s_scalbnf.c b/sysdeps/loongarch/fpu/s_scalbnf.c
> index fde18cf9c1..933fae8e3d 100644
> --- a/sysdeps/loongarch/fpu/s_scalbnf.c
> +++ b/sysdeps/loongarch/fpu/s_scalbnf.c
> @@ -16,6 +16,8 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> +#ifdef __loongarch64
> +
> #define NO_MATH_REDIRECT
> #include <math.h>
>
> @@ -27,3 +29,9 @@ __scalbnf (float x, int fn)
> asm volatile ("fscaleb.s \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (tmp));
> return x;
> }
> +
> +#else /* #ifdef __loongarch64 */
> +
> +#include <sysdeps/ieee754/flt-32/s_scalbnf.c>
> +
> +#endif /* #ifdef __loongarch64 */
> diff --git a/sysdeps/loongarch/fpu/w_ilogb-impl.h b/sysdeps/loongarch/fpu/w_ilogb-impl.h
> index 1905373189..dd14ea791d 100644
> --- a/sysdeps/loongarch/fpu/w_ilogb-impl.h
> +++ b/sysdeps/loongarch/fpu/w_ilogb-impl.h
> @@ -16,6 +16,8 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> +#ifdef __loongarch64
> +
> #include <fpu_control.h>
>
> static inline RET_TYPE
> @@ -35,3 +37,9 @@ IMPL_NAME (double x)
> return x;
> }
> }
> +
> +#else /* #ifdef __loongarch64 */
> +
> +#include <sysdeps/ieee754/dbl-64/w_ilogb-impl.h>
> +
> +#endif /* #ifdef __loongarch64 */
> diff --git a/sysdeps/loongarch/fpu/w_ilogbf-impl.h b/sysdeps/loongarch/fpu/w_ilogbf-impl.h
> index 9cb4172c26..4527dbcd39 100644
> --- a/sysdeps/loongarch/fpu/w_ilogbf-impl.h
> +++ b/sysdeps/loongarch/fpu/w_ilogbf-impl.h
> @@ -16,6 +16,8 @@
> License along with the GNU C Library; if not, see
> <https://www.gnu.org/licenses/>. */
>
> +#ifdef __loongarch64
> +
> #include <fpu_control.h>
>
> static inline RET_TYPE
> @@ -35,3 +37,9 @@ IMPL_NAME (float x)
> return x;
> }
> }
> +
> +#else /* #ifdef __loongarch64 */
> +
> +#include <sysdeps/ieee754/flt-32/w_ilogbf-impl.h>
> +
> +#endif /* #ifdef __loongarch64 */
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