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libc: use MOVP instruction for arm64 memmove() and memset()

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This commit is contained in:
cinap_lenrek 2019-05-09 11:40:54 +02:00
parent 9d790238f2
commit 57e0786595
4 changed files with 28 additions and 28 deletions
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20
sys/src/libc/arm64/memmove.s
View file

@ -9,15 +9,15 @@ TEXT memmove(SB), $-4
_forward:
ADD R0, R2, R3
BIC $7, R2, R4
BIC $15, R2, R4
CBZ R4, _floop1
ADD R0, R4, R4
_floop8:
MOV (R1)8!, R5
MOV R5, (R0)8!
_floop16:
MOVP (R1)16!, R5, R6
MOVP R5, R6, (R0)16!
CMP R4, R0
BNE _floop8
BNE _floop16
_floop1:
CMP R3, R0
@ -32,15 +32,15 @@ _done:
_backward:
ADD R2, R1, R1
ADD R2, R0, R3
BIC $7, R2, R4
BIC $15, R2, R4
CBZ R4, _bloop1
SUB R4, R3, R4
_bloop8:
MOV -8(R1)!, R5
MOV R5, -8(R3)!
_bloop16:
MOVP -16(R1)!, R5, R6
MOVP R5, R6, -16(R3)!
CMP R4, R3
BNE _bloop8
BNE _bloop16
_bloop1:
CMP R0, R3

8
sys/src/libc/arm64/memset.s
View file

@ -3,7 +3,7 @@ TEXT memset(SB), $-4
MOVWU n+16(FP), R2
ADD R0, R2, R3
BIC $7, R2, R4
BIC $15, R2, R4
CBZ R4, _loop1
ADD R0, R4, R4
@ -11,10 +11,10 @@ TEXT memset(SB), $-4
ORR R1<<16, R1
ORR R1<<32, R1
_loop8:
MOV R1, (R0)8!
_loop16:
MOVP R1, R1, (R0)16!
CMP R4, R0
BNE _loop8
BNE _loop16
_loop1:
CMP R3, R0