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plan9fox/sys/src/libc/arm64/memmove.s

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libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
TEXT memcpy(SB), $-4
TEXT memmove(SB), $-4
MOV from+8(FP), R1
MOVWU n+16(FP), R2
CMP R0, R1
BEQ _done
BLT _backward
_forward:
libc: fix return value for arm64 memset() and memove()
2019-05-09 10:40:03 +00:00
MOV R0, R7
libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
ADD R0, R2, R3
libc: use MOVP instruction for arm64 memmove() and memset()
2019-05-09 09:40:54 +00:00
BIC $15, R2, R4
libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
CBZ R4, _floop1
ADD R0, R4, R4
libc: use MOVP instruction for arm64 memmove() and memset()
2019-05-09 09:40:54 +00:00
_floop16:
MOVP (R1)16!, R5, R6
libc: fix return value for arm64 memset() and memove()
2019-05-09 10:40:03 +00:00
MOVP R5, R6, (R7)16!
CMP R4, R7
libc: use MOVP instruction for arm64 memmove() and memset()
2019-05-09 09:40:54 +00:00
BNE _floop16
libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
_floop1:
libc: fix return value for arm64 memset() and memove()
2019-05-09 10:40:03 +00:00
CMP R3, R7
libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
BEQ _done
MOVBU (R1)1!, R5
libc: fix return value for arm64 memset() and memove()
2019-05-09 10:40:03 +00:00
MOVBU R5, (R7)1!
libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
B _floop1
_done:
RETURN
_backward:
ADD R2, R1, R1
ADD R2, R0, R3
libc: use MOVP instruction for arm64 memmove() and memset()
2019-05-09 09:40:54 +00:00
BIC $15, R2, R4
libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
CBZ R4, _bloop1
SUB R4, R3, R4
libc: use MOVP instruction for arm64 memmove() and memset()
2019-05-09 09:40:54 +00:00
_bloop16:
MOVP -16(R1)!, R5, R6
MOVP R5, R6, -16(R3)!
libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
CMP R4, R3
libc: use MOVP instruction for arm64 memmove() and memset()
2019-05-09 09:40:54 +00:00
BNE _bloop16
libc: provide arm64 assembly versions for memmove() and memset() just a first approximation, uses unaligned 8 byte loads and stores. MOVP not yet implemented by the linker. no ZVA cache magic yet.
2019-05-09 00:32:09 +00:00
_bloop1:
CMP R0, R3
BEQ _done
MOVBU -1(R1)!, R5
MOVBU R5, -1(R3)!
B _bloop1
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