diff options
Diffstat (limited to 'sysdeps/loongarch/lp64/multiarch/strcmp-aligned.S')
| -rw-r--r-- | sysdeps/loongarch/lp64/multiarch/strcmp-aligned.S | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/sysdeps/loongarch/lp64/multiarch/strcmp-aligned.S b/sysdeps/loongarch/lp64/multiarch/strcmp-aligned.S new file mode 100644 index 0000000000..f5f4f3364e --- /dev/null +++ b/sysdeps/loongarch/lp64/multiarch/strcmp-aligned.S @@ -0,0 +1,179 @@ +/* Optimized strcmp implementation using basic Loongarch 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) +# define STRCMP_NAME __strcmp_aligned +#else +# define STRCMP_NAME strcmp +#endif + +LEAF(STRCMP_NAME, 6) + lu12i.w a4, 0x01010 + andi a2, a0, 0x7 + ori a4, a4, 0x101 + andi a3, a1, 0x7 + + bstrins.d a4, a4, 63, 32 + li.d t7, -1 + li.d t8, 8 + slli.d a5, a4, 7 + + bne a2, a3, L(unaligned) + bstrins.d a0, zero, 2, 0 + bstrins.d a1, zero, 2, 0 + ld.d t0, a0, 0 + + ld.d t1, a1, 0 + slli.d t3, a2, 3 + sll.d t2, t7, t3 + orn t0, t0, t2 + + + orn t1, t1, t2 + sub.d t2, t0, a4 + andn t3, a5, t0 + and t2, t2, t3 + + bne t0, t1, L(al_end) +L(al_loop): + bnez t2, L(ret0) + ldx.d t0, a0, t8 + ldx.d t1, a1, t8 + + addi.d t8, t8, 8 + sub.d t2, t0, a4 + andn t3, a5, t0 + and t2, t2, t3 + + beq t0, t1, L(al_loop) +L(al_end): + xor t3, t0, t1 + or t2, t2, t3 + ctz.d t3, t2 + + + bstrins.d t3, zero, 2, 0 + srl.d t0, t0, t3 + srl.d t1, t1, t3 + andi t0, t0, 0xff + + andi t1, t1, 0xff + sub.d a0, t0, t1 + jr ra + nop + +L(ret0): + move a0, zero + jr ra + nop + nop + +L(unaligned): + slt a6, a3, a2 + xor t0, a0, a1 + maskeqz t0, t0, a6 + xor a0, a0, t0 + + + xor a1, a1, t0 + andi a2, a0, 0x7 + andi a3, a1, 0x7 + bstrins.d a0, zero, 2, 0 + + bstrins.d a1, zero, 2, 0 + ld.d t4, a0, 0 + ld.d t1, a1, 0 + slli.d a2, a2, 3 + + slli.d a3, a3, 3 + srl.d t0, t4, a2 + srl.d t1, t1, a3 + srl.d t5, t7, a3 + + orn t0, t0, t5 + orn t1, t1, t5 + bne t0, t1, L(not_equal) + sll.d t5, t7, a2 + + + sub.d a3, a2, a3 + orn t4, t4, t5 + sub.d a2, zero, a3 + sub.d t2, t4, a4 + + andn t3, a5, t4 + and t2, t2, t3 + bnez t2, L(find_zero) +L(un_loop): + srl.d t5, t4, a3 + + ldx.d t4, a0, t8 + ldx.d t1, a1, t8 + addi.d t8, t8, 8 + sll.d t0, t4, a2 + + or t0, t0, t5 + bne t0, t1, L(not_equal) + sub.d t2, t4, a4 + andn t3, a5, t4 + + + and t2, t2, t3 + beqz t2, L(un_loop) +L(find_zero): + sub.d t2, t0, a4 + andn t3, a5, t0 + + and t2, t2, t3 + bnez t2, L(ret0) + ldx.d t1, a1, t8 + srl.d t0, t4, a3 + +L(not_equal): + sub.d t2, t0, a4 + andn t3, a5, t0 + and t2, t2, t3 + xor t3, t0, t1 + + or t2, t2, t3 +L(un_end): + ctz.d t3, t2 + bstrins.d t3, zero, 2, 0 + srl.d t0, t0, t3 + + + srl.d t1, t1, t3 + andi t0, t0, 0xff + andi t1, t1, 0xff + sub.d t2, t0, t1 + + + sub.d t3, t1, t0 + masknez t0, t2, a6 + maskeqz t1, t3, a6 + or a0, t0, t1 + + jr ra +END(STRCMP_NAME) + +libc_hidden_builtin_def (STRCMP_NAME) |