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209 lines
5.4 KiB
ArmAsm
209 lines
5.4 KiB
ArmAsm
/* Optimized strncmp implementation using LoongArch LSX instructions.
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Copyright (C) 2023-2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <sys/regdef.h>
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#include <sys/asm.h>
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#if IS_IN (libc) && !defined __loongarch_soft_float
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# define STRNCMP __strncmp_lsx
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LEAF(STRNCMP, 6)
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beqz a2, L(ret0)
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pcalau12i t0, %pc_hi20(L(INDEX))
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andi a3, a0, 0xf
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vld vr2, t0, %pc_lo12(L(INDEX))
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andi a4, a1, 0xf
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li.d t2, 16
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bne a3, a4, L(unaligned)
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xor t0, a0, a3
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xor t1, a1, a4
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vld vr0, t0, 0
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vld vr1, t1, 0
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vreplgr2vr.b vr3, a3
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sub.d t2, t2, a3
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vadd.b vr3, vr3, vr2
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vshuf.b vr0, vr3, vr0, vr3
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vshuf.b vr1, vr3, vr1, vr3
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vseq.b vr3, vr0, vr1
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vmin.bu vr3, vr0, vr3
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bgeu t2, a2, L(al_early_end)
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vsetanyeqz.b fcc0, vr3
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bcnez fcc0, L(al_end)
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add.d a3, a0, a2
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addi.d a4, a3, -1
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bstrins.d a4, zero, 3, 0
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sub.d a2, a3, a4
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L(al_loop):
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vld vr0, t0, 16
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vld vr1, t1, 16
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addi.d t0, t0, 16
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addi.d t1, t1, 16
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vseq.b vr3, vr0, vr1
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vmin.bu vr3, vr0, vr3
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beq t0, a4, L(al_early_end)
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vsetanyeqz.b fcc0, vr3
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bceqz fcc0, L(al_loop)
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L(al_end):
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vseqi.b vr3, vr3, 0
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vfrstpi.b vr3, vr3, 0
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vshuf.b vr0, vr0, vr0, vr3
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vshuf.b vr1, vr1, vr1, vr3
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vpickve2gr.bu t0, vr0, 0
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vpickve2gr.bu t1, vr1, 0
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sub.d a0, t0, t1
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jr ra
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L(al_early_end):
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vreplgr2vr.b vr4, a2
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vslt.b vr4, vr2, vr4
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vorn.v vr3, vr3, vr4
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b L(al_end)
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L(unaligned):
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slt a5, a3, a4
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xor t0, a0, a1
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maskeqz t0, t0, a5
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xor a0, a0, t0
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xor a1, a1, t0
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andi a3, a0, 0xf
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andi a4, a1, 0xf
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xor t0, a0, a3
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xor t1, a1, a4
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vld vr0, t0, 0
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vld vr3, t1, 0
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sub.d t2, t2, a3
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vreplgr2vr.b vr4, a3
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vreplgr2vr.b vr5, a4
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vaddi.bu vr6, vr2, 16
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vsub.b vr7, vr4, vr5
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vsub.b vr6, vr6, vr7
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vadd.b vr4, vr2, vr4
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vshuf.b vr1, vr3, vr3, vr6
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vshuf.b vr0, vr7, vr0, vr4
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vshuf.b vr1, vr7, vr1, vr4
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vseq.b vr4, vr0, vr1
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vmin.bu vr4, vr0, vr4
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bgeu t2, a2, L(un_early_end)
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vsetanyeqz.b fcc0, vr4
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bcnez fcc0, L(un_end)
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add.d a6, a0, a2
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vslt.b vr5, vr2, vr5
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addi.d a7, a6, -1
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vor.v vr3, vr3, vr5
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bstrins.d a7, zero, 3, 0
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sub.d a2, a6, a7
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L(un_loop):
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vld vr0, t0, 16
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addi.d t0, t0, 16
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vsetanyeqz.b fcc0, vr3
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bcnez fcc0, L(has_zero)
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beq t0, a7, L(end_with_len)
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vor.v vr1, vr3, vr3
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vld vr3, t1, 16
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addi.d t1, t1, 16
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vshuf.b vr1, vr3, vr1, vr6
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vseq.b vr4, vr0, vr1
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vmin.bu vr4, vr0, vr4
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vsetanyeqz.b fcc0, vr4
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bceqz fcc0, L(un_loop)
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L(un_end):
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vseqi.b vr4, vr4, 0
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vfrstpi.b vr4, vr4, 0
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vshuf.b vr0, vr0, vr0, vr4
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vshuf.b vr1, vr1, vr1, vr4
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vpickve2gr.bu t0, vr0, 0
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vpickve2gr.bu t1, vr1, 0
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sub.d t2, t0, t1
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sub.d t3, t1, t0
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masknez t0, t2, a5
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maskeqz t1, t3, a5
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or a0, t0, t1
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jr ra
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L(has_zero):
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vshuf.b vr1, vr3, vr3, vr6
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vseq.b vr4, vr0, vr1
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vmin.bu vr4, vr0, vr4
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bne t0, a7, L(un_end)
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L(un_early_end):
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vreplgr2vr.b vr5, a2
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vslt.b vr5, vr2, vr5
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vorn.v vr4, vr4, vr5
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b L(un_end)
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L(end_with_len):
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sub.d a6, a3, a4
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bgeu a6, a2, 1f
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vld vr4, t1, 16
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1:
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vshuf.b vr1, vr4, vr3, vr6
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vseq.b vr4, vr0, vr1
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vmin.bu vr4, vr0, vr4
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vreplgr2vr.b vr5, a2
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vslt.b vr5, vr2, vr5
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vorn.v vr4, vr4, vr5
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b L(un_end)
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L(ret0):
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move a0, zero
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jr ra
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END(STRNCMP)
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.section .rodata.cst16,"M",@progbits,16
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.align 4
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L(INDEX):
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.dword 0x0706050403020100
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.dword 0x0f0e0d0c0b0a0908
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libc_hidden_builtin_def (STRNCMP)
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#endif
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