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208 lines
5.0 KiB
ArmAsm
208 lines
5.0 KiB
ArmAsm
/* Optimized memcmp implementation using LoongArch LASX 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 MEMCMP __memcmp_lasx
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LEAF(MEMCMP, 6)
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li.d t2, 32
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add.d a3, a0, a2
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add.d a4, a1, a2
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bgeu t2, a2, L(less32)
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li.d t1, 160
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bgeu a2, t1, L(make_aligned)
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L(loop32):
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xvld xr0, a0, 0
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xvld xr1, a1, 0
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addi.d a0, a0, 32
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addi.d a1, a1, 32
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addi.d a2, a2, -32
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xvseq.b xr2, xr0, xr1
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xvsetanyeqz.b fcc0, xr2
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bcnez fcc0, L(end)
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L(last_bytes):
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bltu t2, a2, L(loop32)
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xvld xr0, a3, -32
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xvld xr1, a4, -32
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xvseq.b xr2, xr0, xr1
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L(end):
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xvmsknz.b xr2, xr2
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xvpermi.q xr4, xr0, 1
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xvpickve.w xr3, xr2, 4
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xvpermi.q xr5, xr1, 1
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vilvl.h vr2, vr3, vr2
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movfr2gr.s t0, fa2
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cto.w t0, t0
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vreplgr2vr.b vr2, t0
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vshuf.b vr0, vr4, vr0, vr2
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vshuf.b vr1, vr5, vr1, vr2
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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(less32):
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srli.d t0, a2, 4
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beqz t0, L(less16)
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vld vr0, a0, 0
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vld vr1, a1, 0
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vld vr2, a3, -16
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vld vr3, a4, -16
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L(short_ret):
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vseq.b vr4, vr0, vr1
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vseq.b vr5, vr2, vr3
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vmsknz.b vr4, vr4
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vmsknz.b vr5, vr5
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vilvl.h vr4, vr5, vr4
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movfr2gr.s t0, fa4
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cto.w t0, t0
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vreplgr2vr.b vr4, t0
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vshuf.b vr0, vr2, vr0, vr4
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vshuf.b vr1, vr3, 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 a0, t0, t1
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jr ra
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L(less16):
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srli.d t0, a2, 3
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beqz t0, L(less8)
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vldrepl.d vr0, a0, 0
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vldrepl.d vr1, a1, 0
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vldrepl.d vr2, a3, -8
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vldrepl.d vr3, a4, -8
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b L(short_ret)
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nop
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L(less8):
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srli.d t0, a2, 2
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beqz t0, L(less4)
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vldrepl.w vr0, a0, 0
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vldrepl.w vr1, a1, 0
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vldrepl.w vr2, a3, -4
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vldrepl.w vr3, a4, -4
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b L(short_ret)
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nop
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L(less4):
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srli.d t0, a2, 1
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beqz t0, L(less2)
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vldrepl.h vr0, a0, 0
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vldrepl.h vr1, a1, 0
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vldrepl.h vr2, a3, -2
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vldrepl.h vr3, a4, -2
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b L(short_ret)
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nop
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L(less2):
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beqz a2, L(ret0)
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ld.bu t0, a0, 0
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ld.bu t1, a1, 0
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sub.d a0, t0, t1
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jr ra
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L(ret0):
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move a0, zero
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jr ra
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L(make_aligned):
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xvld xr0, a0, 0
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xvld xr1, a1, 0
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xvseq.b xr2, xr0, xr1
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xvsetanyeqz.b fcc0, xr2
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bcnez fcc0, L(end)
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andi t0, a0, 0x1f
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sub.d t0, t2, t0
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sub.d t1, a2, t0
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add.d a0, a0, t0
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add.d a1, a1, t0
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andi a2, t1, 0x3f
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sub.d t0, t1, a2
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add.d a5, a0, t0
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L(loop_align):
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xvld xr0, a0, 0
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xvld xr1, a1, 0
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xvld xr2, a0, 32
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xvld xr3, a1, 32
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xvseq.b xr0, xr0, xr1
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xvseq.b xr1, xr2, xr3
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xvmin.bu xr2, xr1, xr0
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xvsetanyeqz.b fcc0, xr2
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bcnez fcc0, L(pair_end)
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addi.d a0, a0, 64
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addi.d a1, a1, 64
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bne a0, a5, L(loop_align)
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bnez a2, L(last_bytes)
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move a0, zero
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jr ra
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nop
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L(pair_end):
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xvmsknz.b xr0, xr0
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xvmsknz.b xr1, xr1
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xvpickve.w xr2, xr0, 4
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xvpickve.w xr3, xr1, 4
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vilvl.h vr0, vr2, vr0
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vilvl.h vr1, vr3, vr1
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vilvl.w vr0, vr1, vr0
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movfr2gr.d t0, fa0
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cto.d t0, t0
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ldx.bu t1, a0, t0
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ldx.bu t2, a1, t0
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sub.d a0, t1, t2
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jr ra
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END(MEMCMP)
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libc_hidden_builtin_def (MEMCMP)
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#endif
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