diff options
Diffstat (limited to 'sysdeps/loongarch/lp64/multiarch/strncmp-aligned.S')
| -rw-r--r-- | sysdeps/loongarch/lp64/multiarch/strncmp-aligned.S | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/sysdeps/loongarch/lp64/multiarch/strncmp-aligned.S b/sysdeps/loongarch/lp64/multiarch/strncmp-aligned.S new file mode 100644 index 0000000000..e2687fa770 --- /dev/null +++ b/sysdeps/loongarch/lp64/multiarch/strncmp-aligned.S @@ -0,0 +1,218 @@ +/* Optimized strncmp 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 STRNCMP __strncmp_aligned +#else +# define STRNCMP strncmp +#endif + +LEAF(STRNCMP, 6) + beqz a2, L(ret0) + lu12i.w a5, 0x01010 + andi a3, a0, 0x7 + ori a5, a5, 0x101 + + andi a4, a1, 0x7 + bstrins.d a5, a5, 63, 32 + li.d t7, -1 + li.d t8, 8 + + addi.d a2, a2, -1 + slli.d a6, a5, 7 + bne a3, a4, 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 t2, a3, 3 + + + sub.d t5, t8, a3 + srl.d t3, t7, t2 + srl.d t0, t0, t2 + srl.d t1, t1, t2 + + orn t0, t0, t3 + orn t1, t1, t3 + sub.d t2, t0, a5 + andn t3, a6, t0 + + and t2, t2, t3 + bne t0, t1, L(al_end) + sltu t4, a2, t5 + sub.d a2, a2, t5 + +L(al_loop): + or t4, t2, t4 + bnez t4, L(ret0) + ldx.d t0, a0, t8 + ldx.d t1, a1, t8 + + + addi.d t8, t8, 8 + sltui t4, a2, 8 + addi.d a2, a2, -8 + sub.d t2, t0, a5 + + andn t3, a6, t0 + and t2, t2, t3 + beq t0, t1, L(al_loop) + addi.d a2, a2, 8 + +L(al_end): + xor t3, t0, t1 + or t2, t2, t3 + ctz.d t2, t2 + srli.d t4, t2, 3 + + bstrins.d t2, zero, 2, 0 + srl.d t0, t0, t2 + srl.d t1, t1, t2 + andi t0, t0, 0xff + + + andi t1, t1, 0xff + sltu t2, a2, t4 + sub.d a0, t0, t1 + masknez a0, a0, t2 + + jr ra +L(ret0): + move a0, zero + jr ra + nop + +L(unaligned): + slt a7, a4, a3 + xor t0, a0, a1 + maskeqz t0, t0, a7 + xor a0, a0, t0 + + xor a1, a1, t0 + andi a3, a0, 0x7 + andi a4, 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 t2, a3, 3 + + slli.d t3, a4, 3 + srl.d t5, t7, t3 + srl.d t0, t4, t2 + srl.d t1, t1, t3 + + orn t0, t0, t5 + orn t1, t1, t5 + bne t0, t1, L(not_equal) + sub.d t6, t8, a4 + + sub.d a4, t2, t3 + sll.d t2, t7, t2 + sub.d t5, t8, a3 + orn t4, t4, t2 + + + sub.d t2, t4, a5 + andn t3, a6, t4 + sltu t7, a2, t5 + and t2, t2, t3 + + sub.d a3, zero, a4 + or t2, t2, t7 + bnez t2, L(un_end) + sub.d t7, t5, t6 + + sub.d a2, a2, t5 + sub.d t6, t8, t7 +L(un_loop): + srl.d t5, t4, a4 + ldx.d t4, a0, t8 + + ldx.d t1, a1, t8 + addi.d t8, t8, 8 + sll.d t0, t4, a3 + or t0, t0, t5 + + + bne t0, t1, L(loop_not_equal) + sub.d t2, t4, a5 + andn t3, a6, t4 + sltui t5, a2, 8 + + and t2, t2, t3 + addi.d a2, a2, -8 + or t3, t2, t5 + beqz t3, L(un_loop) + + addi.d a2, a2, 8 +L(un_end): + sub.d t2, t0, a5 + andn t3, a6, t0 + sltu t5, a2, t6 + + and t2, t2, t3 + or t2, t2, t5 + bnez t2, L(ret0) + ldx.d t1, a1, t8 + + + srl.d t0, t4, a4 + sub.d a2, a2, t6 +L(not_equal): + sub.d t2, t0, a5 + andn t3, a6, t0 + + xor t4, t0, t1 + and t2, t2, t3 + or t2, t2, t4 + ctz.d t2, t2 + + bstrins.d t2, zero, 2, 0 + srli.d t4, t2, 3 + srl.d t0, t0, t2 + srl.d t1, t1, t2 + + andi t0, t0, 0xff + andi t1, t1, 0xff + sub.d t2, t0, t1 + sub.d t3, t1, t0 + + + masknez t0, t2, a7 + maskeqz t1, t3, a7 + sltu t2, a2, t4 + or a0, t0, t1 + + masknez a0, a0, t2 + jr ra +L(loop_not_equal): + add.d a2, a2, t7 + b L(not_equal) +END(STRNCMP) + +libc_hidden_builtin_def (STRNCMP) |