diff options
Diffstat (limited to 'sysdeps/loongarch/lp64/multiarch/strlen-lsx.S')
-rw-r--r-- | sysdeps/loongarch/lp64/multiarch/strlen-lsx.S | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/sysdeps/loongarch/lp64/multiarch/strlen-lsx.S b/sysdeps/loongarch/lp64/multiarch/strlen-lsx.S new file mode 100644 index 0000000000..b194355e7b --- /dev/null +++ b/sysdeps/loongarch/lp64/multiarch/strlen-lsx.S @@ -0,0 +1,71 @@ +/* Optimized strlen implementation using Loongarch LSX SIMD instructions. + Copyright (C) 2023 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/>. */ + +#include <sysdep.h> +#include <sys/regdef.h> +#include <sys/asm.h> + +#if IS_IN (libc) && !defined __loongarch_soft_float + +# define STRLEN __strlen_lsx + +LEAF(STRLEN, 6) + move a1, a0 + bstrins.d a0, zero, 4, 0 + vld vr0, a0, 0 + vld vr1, a0, 16 + + li.d t1, -1 + vmsknz.b vr0, vr0 + vmsknz.b vr1, vr1 + vilvl.h vr0, vr1, vr0 + + movfr2gr.s t0, fa0 + sra.w t0, t0, a1 + beq t0, t1, L(loop) + cto.w a0, t0 + + jr ra + nop + nop + nop + + +L(loop): + vld vr0, a0, 32 + vld vr1, a0, 48 + addi.d a0, a0, 32 + vmin.bu vr2, vr0, vr1 + + vsetanyeqz.b fcc0, vr2 + bceqz fcc0, L(loop) + vmsknz.b vr0, vr0 + vmsknz.b vr1, vr1 + + vilvl.h vr0, vr1, vr0 + sub.d a0, a0, a1 + movfr2gr.s t0, fa0 + cto.w t0, t0 + + add.d a0, a0, t0 + jr ra +END(STRLEN) + +libc_hidden_builtin_def (STRLEN) +#endif |