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163 lines
3.9 KiB
ArmAsm
163 lines
3.9 KiB
ArmAsm
/* Optimized memset unaligned implementation using basic LoongArch 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)
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# define MEMSET_NAME __memset_unaligned
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#define ST_128(n) \
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st.d a1, a0, n; \
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st.d a1, a0, n+8 ; \
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st.d a1, a0, n+16 ; \
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st.d a1, a0, n+24 ; \
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st.d a1, a0, n+32 ; \
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st.d a1, a0, n+40 ; \
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st.d a1, a0, n+48 ; \
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st.d a1, a0, n+56 ; \
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st.d a1, a0, n+64 ; \
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st.d a1, a0, n+72 ; \
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st.d a1, a0, n+80 ; \
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st.d a1, a0, n+88 ; \
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st.d a1, a0, n+96 ; \
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st.d a1, a0, n+104; \
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st.d a1, a0, n+112; \
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st.d a1, a0, n+120;
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LEAF(MEMSET_NAME, 6)
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bstrins.d a1, a1, 15, 8
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add.d t7, a0, a2
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bstrins.d a1, a1, 31, 16
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move t0, a0
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bstrins.d a1, a1, 63, 32
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srai.d t8, a2, 4
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beqz t8, L(less_16bytes)
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srai.d t8, a2, 6
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bnez t8, L(more_64bytes)
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srai.d t8, a2, 5
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beqz t8, L(less_32bytes)
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st.d a1, a0, 0
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st.d a1, a0, 8
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st.d a1, a0, 16
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st.d a1, a0, 24
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st.d a1, t7, -32
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st.d a1, t7, -24
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st.d a1, t7, -16
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st.d a1, t7, -8
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jr ra
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L(less_32bytes):
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st.d a1, a0, 0
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st.d a1, a0, 8
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st.d a1, t7, -16
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st.d a1, t7, -8
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jr ra
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L(less_16bytes):
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srai.d t8, a2, 3
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beqz t8, L(less_8bytes)
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st.d a1, a0, 0
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st.d a1, t7, -8
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jr ra
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L(less_8bytes):
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srai.d t8, a2, 2
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beqz t8, L(less_4bytes)
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st.w a1, a0, 0
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st.w a1, t7, -4
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jr ra
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L(less_4bytes):
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srai.d t8, a2, 1
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beqz t8, L(less_2bytes)
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st.h a1, a0, 0
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st.h a1, t7, -2
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jr ra
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L(less_2bytes):
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beqz a2, L(less_1bytes)
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st.b a1, a0, 0
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jr ra
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L(less_1bytes):
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jr ra
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L(more_64bytes):
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srli.d a0, a0, 3
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slli.d a0, a0, 3
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addi.d a0, a0, 0x8
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st.d a1, t0, 0
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sub.d t2, t0, a0
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add.d a2, t2, a2
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addi.d a2, a2, -0x80
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blt a2, zero, L(end_unalign_proc)
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L(loop_less):
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ST_128(0)
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addi.d a0, a0, 0x80
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addi.d a2, a2, -0x80
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bge a2, zero, L(loop_less)
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L(end_unalign_proc):
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addi.d a2, a2, 0x80
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pcaddi t1, 20
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andi t5, a2, 0x78
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srli.d t5, t5, 1
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sub.d t1, t1, t5
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jr t1
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st.d a1, a0, 112
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st.d a1, a0, 104
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st.d a1, a0, 96
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st.d a1, a0, 88
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st.d a1, a0, 80
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st.d a1, a0, 72
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st.d a1, a0, 64
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st.d a1, a0, 56
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st.d a1, a0, 48
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st.d a1, a0, 40
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st.d a1, a0, 32
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st.d a1, a0, 24
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st.d a1, a0, 16
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st.d a1, a0, 8
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st.d a1, a0, 0
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st.d a1, t7, -8
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move a0, t0
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jr ra
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END(MEMSET_NAME)
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libc_hidden_builtin_def (MEMSET_NAME)
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#endif
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