From: Xiaolin Tang <tangxiaolin@loongson.cn>
To: adhemerval.zanella@linaro.org, libc-alpha@sourceware.org,
caiyinyu@loongson.cn, xry111@xry111.site
Cc: xuchenghua@loongson.cn, chenglulu@loongson.cn,
Xiaolin Tang <tangxiaolin@loongson.cn>
Subject: [PATCH 9/9] LoongArch: Add support for scalb[f]
Date: Wed, 23 Nov 2022 10:38:51 +0800 [thread overview]
Message-ID: <20221123023851.751187-4-tangxiaolin@loongson.cn> (raw)
In-Reply-To: <20221123023851.751187-1-tangxiaolin@loongson.cn>
Add inline assembler for the scalb functions. Passes GLIBC regression.
---
sysdeps/loongarch/fpu/e_scalb.c | 60 ++++++++++++++++++++++++++++++++
sysdeps/loongarch/fpu/e_scalbf.c | 60 ++++++++++++++++++++++++++++++++
2 files changed, 120 insertions(+)
create mode 100644 sysdeps/loongarch/fpu/e_scalb.c
create mode 100644 sysdeps/loongarch/fpu/e_scalbf.c
diff --git a/sysdeps/loongarch/fpu/e_scalb.c b/sysdeps/loongarch/fpu/e_scalb.c
new file mode 100644
index 0000000000..9fdf21fa3a
--- /dev/null
+++ b/sysdeps/loongarch/fpu/e_scalb.c
@@ -0,0 +1,60 @@
+/* scalb(). LoongArch version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <libm-alias-finite.h>
+#include <fpu_control.h>
+#include <float.h>
+
+double
+__ieee754_scalb (double x, double fn)
+{
+ int x_cond;
+ int fn_cond;
+ asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
+ asm volatile ("fclass.d \t%0, %1" : "=f" (fn_cond) : "f" (fn));
+
+ if (__glibc_unlikely(( x_cond | fn_cond) & _FCLASS_NAN))
+ return x * fn;
+ else if (__glibc_unlikely(fn_cond & _FCLASS_INF))
+ {
+ if (!(fn_cond & _FCLASS_MINF))
+ return x * fn;
+ else
+ return x / -fn;
+ }
+ else if (__glibc_likely(-DBL_MAX < fn && fn < DBL_MAX))
+ {
+ double rint_fn, tmp;
+
+ /* rint_fn = rint(fn) */
+ asm volatile ("frint.d \t%0, %1" : "=f" (rint_fn) : "f" (fn));
+
+ if (rint_fn != fn )
+ return (x - x) / (x - x);
+
+ asm volatile ("ftintrz.l.d \t%0, %1" : "=f" (tmp) : "f" (rint_fn));
+ asm volatile ("fscaleb.d \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (tmp));
+ }
+ else
+ asm volatile ("fscaleb.d \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (fn));
+
+ return x;
+}
+libm_alias_finite (__ieee754_scalb, __scalb)
diff --git a/sysdeps/loongarch/fpu/e_scalbf.c b/sysdeps/loongarch/fpu/e_scalbf.c
new file mode 100644
index 0000000000..fae2e92e20
--- /dev/null
+++ b/sysdeps/loongarch/fpu/e_scalbf.c
@@ -0,0 +1,60 @@
+/* scalbf(). LoongArch version.
+ Copyright (C) 2022 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <https://www.gnu.org/licenses/>. */
+
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <libm-alias-finite.h>
+#include <fpu_control.h>
+#include <float.h>
+
+float
+__ieee754_scalbf (float x, float fn)
+{
+ int x_cond;
+ int fn_cond;
+ asm volatile ("fclass.s \t%0, %1" : "=f" (x_cond) : "f" (x));
+ asm volatile ("fclass.s \t%0, %1" : "=f" (fn_cond) : "f" (fn));
+
+ if (__glibc_unlikely(( x_cond | fn_cond) & _FCLASS_NAN))
+ return x * fn;
+ else if (__glibc_unlikely(fn_cond & _FCLASS_INF))
+ {
+ if (!(fn_cond & _FCLASS_MINF))
+ return x * fn;
+ else
+ return x / -fn;
+ }
+ else if (__glibc_likely(-FLT_MAX < fn && fn < FLT_MAX))
+ {
+ float rintf_fn, tmp;
+
+ /* rintf_fn = rintf(fn) */
+ asm volatile ("frint.s \t%0, %1" : "=f" (rintf_fn) : "f" (fn));
+
+ if (rintf_fn != fn )
+ return (x - x) / (x - x);
+
+ asm volatile ("ftintrz.w.s \t%0, %1" : "=f" (tmp) : "f" (rintf_fn));
+ asm volatile ("fscaleb.s \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (tmp));
+ }
+ else
+ asm volatile ("fscaleb.s \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (fn));
+
+ return x;
+}
+libm_alias_finite (__ieee754_scalb, __scalb)
--
2.20.1
next prev parent reply other threads:[~2022-11-23 2:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-23 2:38 [PATCH 0/9] LoongArch: Use builtins with GCC >= 13 Xiaolin Tang
2022-11-23 2:38 ` [PATCH 1/9] LoongArch: Use __builtin_rint{,f} " Xiaolin Tang
2022-11-23 2:38 ` [PATCH 8/9] LoongArch: Add support for scalbn[f] Xiaolin Tang
2022-11-23 2:38 ` Xiaolin Tang [this message]
-- strict thread matches above, loose matches on Subject: below --
2022-11-18 11:32 [PATCH 9/9] LoongArch: Add support for scalb[f] Xiaolin Tang
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