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248 lines
5.7 KiB
ArmAsm
248 lines
5.7 KiB
ArmAsm
/* Optimized unaligned memcpy implementation using basic LoongArch instructions.
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Copyright (C) 2023 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 MEMCPY_NAME __memcpy_unaligned
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# define LD_64(reg, n) \
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ld.d t0, reg, n; \
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ld.d t1, reg, n + 8; \
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ld.d t2, reg, n + 16; \
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ld.d t3, reg, n + 24; \
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ld.d t4, reg, n + 32; \
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ld.d t5, reg, n + 40; \
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ld.d t6, reg, n + 48; \
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ld.d t7, reg, n + 56;
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# define ST_64(reg, n) \
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st.d t0, reg, n; \
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st.d t1, reg, n + 8; \
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st.d t2, reg, n + 16; \
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st.d t3, reg, n + 24; \
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st.d t4, reg, n + 32; \
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st.d t5, reg, n + 40; \
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st.d t6, reg, n + 48; \
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st.d t7, reg, n + 56;
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LEAF(MEMCPY_NAME, 3)
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add.d a4, a1, a2
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add.d a3, a0, a2
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li.w a6, 16
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bge a6, a2, L(less_16bytes)
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li.w a6, 128
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blt a6, a2, L(long_bytes)
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li.w a6, 64
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blt a6, a2, L(more_64bytes)
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li.w a6, 32
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blt a6, a2, L(more_32bytes)
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ld.d t0, a1, 0
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ld.d t1, a1, 8
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ld.d t2, a4, -16
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ld.d t3, a4, -8
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st.d t0, a0, 0
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st.d t1, a0, 8
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st.d t2, a3, -16
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st.d t3, a3, -8
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jr ra
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L(more_64bytes):
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srli.d t8, a0, 3
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slli.d t8, t8, 3
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addi.d t8, t8, 0x8
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sub.d a7, a0, t8
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ld.d t0, a1, 0
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sub.d a1, a1, a7
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st.d t0, a0, 0
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add.d a7, a7, a2
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addi.d a7, a7, -0x20
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L(loop_32):
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ld.d t0, a1, 0
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ld.d t1, a1, 8
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ld.d t2, a1, 16
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ld.d t3, a1, 24
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st.d t0, t8, 0
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st.d t1, t8, 8
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st.d t2, t8, 16
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st.d t3, t8, 24
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addi.d t8, t8, 0x20
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addi.d a1, a1, 0x20
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addi.d a7, a7, -0x20
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blt zero, a7, L(loop_32)
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ld.d t4, a4, -32
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ld.d t5, a4, -24
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ld.d t6, a4, -16
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ld.d t7, a4, -8
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st.d t4, a3, -32
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st.d t5, a3, -24
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st.d t6, a3, -16
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st.d t7, a3, -8
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jr ra
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L(more_32bytes):
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ld.d t0, a1, 0
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ld.d t1, a1, 8
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ld.d t2, a1, 16
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ld.d t3, a1, 24
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ld.d t4, a4, -32
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ld.d t5, a4, -24
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ld.d t6, a4, -16
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ld.d t7, a4, -8
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st.d t0, a0, 0
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st.d t1, a0, 8
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st.d t2, a0, 16
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st.d t3, a0, 24
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st.d t4, a3, -32
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st.d t5, a3, -24
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st.d t6, a3, -16
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st.d t7, a3, -8
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jr ra
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L(less_16bytes):
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srai.d a6, a2, 3
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beqz a6, L(less_8bytes)
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ld.d t0, a1, 0
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ld.d t1, a4, -8
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st.d t0, a0, 0
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st.d t1, a3, -8
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jr ra
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L(less_8bytes):
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srai.d a6, a2, 2
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beqz a6, L(less_4bytes)
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ld.w t0, a1, 0
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ld.w t1, a4, -4
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st.w t0, a0, 0
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st.w t1, a3, -4
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jr ra
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L(less_4bytes):
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srai.d a6, a2, 1
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beqz a6, L(less_2bytes)
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ld.h t0, a1, 0
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ld.h t1, a4, -2
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st.h t0, a0, 0
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st.h t1, a3, -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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ld.b t0, a1, 0
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st.b t0, 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(long_bytes):
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srli.d t8, a0, 3
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slli.d t8, t8, 3
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beq a0, t8, L(start)
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ld.d t0, a1, 0
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addi.d t8, t8, 0x8
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st.d t0, a0, 0
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sub.d a7, a0, t8
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sub.d a1, a1, a7
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L(start):
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addi.d a5, a3, -0x80
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blt a5, t8, L(align_end_proc)
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L(loop_128):
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LD_64(a1, 0)
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ST_64(t8, 0)
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LD_64(a1, 64)
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addi.d a1, a1, 0x80
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ST_64(t8, 64)
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addi.d t8, t8, 0x80
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bge a5, t8, L(loop_128)
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L(align_end_proc):
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sub.d a2, a3, t8
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pcaddi t1, 34
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andi t2, a2, 0x78
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sub.d t1, t1, t2
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jr t1
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ld.d t0, a1, 112
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st.d t0, t8, 112
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ld.d t0, a1, 104
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st.d t0, t8, 104
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ld.d t0, a1, 96
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st.d t0, t8, 96
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ld.d t0, a1, 88
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st.d t0, t8, 88
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ld.d t0, a1, 80
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st.d t0, t8, 80
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ld.d t0, a1, 72
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st.d t0, t8, 72
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ld.d t0, a1, 64
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st.d t0, t8, 64
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ld.d t0, a1, 56
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st.d t0, t8, 56
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ld.d t0, a1, 48
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st.d t0, t8, 48
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ld.d t0, a1, 40
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st.d t0, t8, 40
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ld.d t0, a1, 32
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st.d t0, t8, 32
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ld.d t0, a1, 24
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st.d t0, t8, 24
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ld.d t0, a1, 16
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st.d t0, t8, 16
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ld.d t0, a1, 8
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st.d t0, t8, 8
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ld.d t0, a1, 0
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st.d t0, t8, 0
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ld.d t0, a4, -8
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st.d t0, a3, -8
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jr ra
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END(MEMCPY_NAME)
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libc_hidden_builtin_def (MEMCPY_NAME)
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#endif
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