diff options
Diffstat (limited to 'sysdeps/loongarch/lp64/multiarch/strncmp-lsx.S')
| -rw-r--r-- | sysdeps/loongarch/lp64/multiarch/strncmp-lsx.S | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/sysdeps/loongarch/lp64/multiarch/strncmp-lsx.S b/sysdeps/loongarch/lp64/multiarch/strncmp-lsx.S new file mode 100644 index 0000000000..0b4eee2a98 --- /dev/null +++ b/sysdeps/loongarch/lp64/multiarch/strncmp-lsx.S @@ -0,0 +1,208 @@ +/* Optimized strncmp implementation using Loongarch LSX 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 STRNCMP __strncmp_lsx + +LEAF(STRNCMP, 6) + beqz a2, L(ret0) + pcalau12i t0, %pc_hi20(L(INDEX)) + andi a3, a0, 0xf + vld vr2, t0, %pc_lo12(L(INDEX)) + + andi a4, a1, 0xf + li.d t2, 16 + bne a3, a4, L(unaligned) + xor t0, a0, a3 + + xor t1, a1, a4 + vld vr0, t0, 0 + vld vr1, t1, 0 + vreplgr2vr.b vr3, a3 + + + sub.d t2, t2, a3 + vadd.b vr3, vr3, vr2 + vshuf.b vr0, vr3, vr0, vr3 + vshuf.b vr1, vr3, vr1, vr3 + + vseq.b vr3, vr0, vr1 + vmin.bu vr3, vr0, vr3 + bgeu t2, a2, L(al_early_end) + vsetanyeqz.b fcc0, vr3 + + bcnez fcc0, L(al_end) + add.d a3, a0, a2 + addi.d a4, a3, -1 + bstrins.d a4, zero, 3, 0 + + sub.d a2, a3, a4 +L(al_loop): + vld vr0, t0, 16 + vld vr1, t1, 16 + addi.d t0, t0, 16 + + + addi.d t1, t1, 16 + vseq.b vr3, vr0, vr1 + vmin.bu vr3, vr0, vr3 + beq t0, a4, L(al_early_end) + + vsetanyeqz.b fcc0, vr3 + bceqz fcc0, L(al_loop) +L(al_end): + vseqi.b vr3, vr3, 0 + vfrstpi.b vr3, vr3, 0 + + vshuf.b vr0, vr0, vr0, vr3 + vshuf.b vr1, vr1, vr1, vr3 + vpickve2gr.bu t0, vr0, 0 + vpickve2gr.bu t1, vr1, 0 + + sub.d a0, t0, t1 + jr ra +L(al_early_end): + vreplgr2vr.b vr4, a2 + vslt.b vr4, vr2, vr4 + + + vorn.v vr3, vr3, vr4 + b L(al_end) +L(unaligned): + slt a5, a3, a4 + xor t0, a0, a1 + + maskeqz t0, t0, a5 + xor a0, a0, t0 + xor a1, a1, t0 + andi a3, a0, 0xf + + andi a4, a1, 0xf + xor t0, a0, a3 + xor t1, a1, a4 + vld vr0, t0, 0 + + vld vr3, t1, 0 + sub.d t2, t2, a3 + vreplgr2vr.b vr4, a3 + vreplgr2vr.b vr5, a4 + + + vaddi.bu vr6, vr2, 16 + vsub.b vr7, vr4, vr5 + vsub.b vr6, vr6, vr7 + vadd.b vr4, vr2, vr4 + + vshuf.b vr1, vr3, vr3, vr6 + vshuf.b vr0, vr7, vr0, vr4 + vshuf.b vr1, vr7, vr1, vr4 + vseq.b vr4, vr0, vr1 + + vmin.bu vr4, vr0, vr4 + bgeu t2, a2, L(un_early_end) + vsetanyeqz.b fcc0, vr4 + bcnez fcc0, L(un_end) + + add.d a6, a0, a2 + vslt.b vr5, vr2, vr5 + addi.d a7, a6, -1 + vor.v vr3, vr3, vr5 + + + bstrins.d a7, zero, 3, 0 + sub.d a2, a6, a7 +L(un_loop): + vld vr0, t0, 16 + addi.d t0, t0, 16 + + vsetanyeqz.b fcc0, vr3 + bcnez fcc0, L(has_zero) + beq t0, a7, L(end_with_len) + vor.v vr1, vr3, vr3 + + vld vr3, t1, 16 + addi.d t1, t1, 16 + vshuf.b vr1, vr3, vr1, vr6 + vseq.b vr4, vr0, vr1 + + vmin.bu vr4, vr0, vr4 + vsetanyeqz.b fcc0, vr4 + bceqz fcc0, L(un_loop) +L(un_end): + vseqi.b vr4, vr4, 0 + + + vfrstpi.b vr4, vr4, 0 + vshuf.b vr0, vr0, vr0, vr4 + vshuf.b vr1, vr1, vr1, vr4 + vpickve2gr.bu t0, vr0, 0 + + vpickve2gr.bu t1, vr1, 0 + sub.d t2, t0, t1 + sub.d t3, t1, t0 + masknez t0, t2, a5 + + maskeqz t1, t3, a5 + or a0, t0, t1 + jr ra +L(has_zero): + vshuf.b vr1, vr3, vr3, vr6 + + vseq.b vr4, vr0, vr1 + vmin.bu vr4, vr0, vr4 + bne t0, a7, L(un_end) +L(un_early_end): + vreplgr2vr.b vr5, a2 + + vslt.b vr5, vr2, vr5 + vorn.v vr4, vr4, vr5 + b L(un_end) +L(end_with_len): + sub.d a6, a3, a4 + + bgeu a6, a2, 1f + vld vr4, t1, 16 +1: + vshuf.b vr1, vr4, vr3, vr6 + vseq.b vr4, vr0, vr1 + + vmin.bu vr4, vr0, vr4 + vreplgr2vr.b vr5, a2 + vslt.b vr5, vr2, vr5 + vorn.v vr4, vr4, vr5 + + b L(un_end) +L(ret0): + move a0, zero + jr ra +END(STRNCMP) + + .section .rodata.cst16,"M",@progbits,16 + .align 4 +L(INDEX): + .dword 0x0706050403020100 + .dword 0x0f0e0d0c0b0a0908 + +libc_hidden_builtin_def (STRNCMP) +#endif |