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author | Xiaolin Tang <tangxiaolin@loongson.cn> | 2022-11-23 11:49:24 +0800 |
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committer | caiyinyu <caiyinyu@loongson.cn> | 2022-11-29 16:00:29 +0800 |
commit | e3d9ca4e9474ed4f9b6a9879867f14fea6e2bee9 (patch) | |
tree | 78fa7b09b76a1919d1f8729b0d5bbe01390b0959 /sysdeps/loongarch/fpu/s_scalbn.c | |
parent | 13c549f49705d10105b16706124077e07068a936 (diff) | |
download | glibc-e3d9ca4e9474ed4f9b6a9879867f14fea6e2bee9.tar.gz glibc-e3d9ca4e9474ed4f9b6a9879867f14fea6e2bee9.tar.xz glibc-e3d9ca4e9474ed4f9b6a9879867f14fea6e2bee9.zip |
LoongArch: Add support for scalbn[f]
Add inline assembler for the scalbn functions. Passes GLIBC regression. GCC 13, LoongArch support ___builtin_scalbn{,f} with -fno-math-errno, but only "libm" can use -fno-math-errno in GLIBC, and scalbn is in libc instead of libm because __printf_fp calls it.
Diffstat (limited to 'sysdeps/loongarch/fpu/s_scalbn.c')
-rw-r--r-- | sysdeps/loongarch/fpu/s_scalbn.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/sysdeps/loongarch/fpu/s_scalbn.c b/sysdeps/loongarch/fpu/s_scalbn.c new file mode 100644 index 0000000000..c03e81a31e --- /dev/null +++ b/sysdeps/loongarch/fpu/s_scalbn.c @@ -0,0 +1,29 @@ +/* scalbn(). 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> + +double +__scalbn (double x, int fn) +{ + double tmp; + 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; +} |