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Fix performance issue in misaligned strcpy.

This commit is contained in:
Wilco 2014-08-07 14:30:31 +00:00
parent d4795e4a43
commit 538e9e454d
2 changed files with 8 additions and 3 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2014-08-07 Wilco Dijkstra <wdijkstr@arm.com>
* sysdeps/arm/armv6/strcpy.S (strcpy):
Fix performance issue in misaligned cases.
2014-08-05 Adhemerval Zanella <azanella@linux.vnet.ibm.com> 2014-08-05 Adhemerval Zanella <azanella@linux.vnet.ibm.com>
* sysdeps/unix/sysv/linux/powerpc/bits/ioctl-types.h (struct winsize): * sysdeps/unix/sysv/linux/powerpc/bits/ioctl-types.h (struct winsize):

6
sysdeps/arm/armv6/strcpy.S
View File

@ -159,7 +159,7 @@ ENTRY (strcpy)
@ Prologue to unaligned loop. Seed shifted non-zero bytes. @ Prologue to unaligned loop. Seed shifted non-zero bytes.
uqsub8 r4, r7, r2 @ Find EOS uqsub8 r4, r7, r2 @ Find EOS
uqsub8 r5, r7, r3 uqsub8 r5, r7, r3
mvns r4, r4 @ EOS in first word? cmp r4, #0 @ EOS in first word?
it ne it ne
subne r1, r1, #8 subne r1, r1, #8
bne .Lbyte_loop bne .Lbyte_loop
@ -179,7 +179,7 @@ ENTRY (strcpy)
@ Rotated unaligned copy loop. The tail of the prologue is @ Rotated unaligned copy loop. The tail of the prologue is
@ shared with the loop itself. @ shared with the loop itself.
.balign 8 .balign 8
1: mvns r5, r5 @ EOS in second word? 1: cmp r5, #0 @ EOS in second word?
bne 4f bne 4f
@ Combine first and second words @ Combine first and second words
orr r2, r2, r3, lsh_gt #(\unalign*8) orr r2, r2, r3, lsh_gt #(\unalign*8)
@ -194,7 +194,7 @@ ENTRY (strcpy)
sfi_pld r1, #128 sfi_pld r1, #128
uqsub8 r5, r7, r3 uqsub8 r5, r7, r3
sfi_pld r0, #128 sfi_pld r0, #128
mvns r4, r4 @ EOS in first word? cmp r4, #0 @ EOS in first word?
bne 3f bne 3f
@ Combine the leftover and the first word @ Combine the leftover and the first word
orr r6, r6, r2, lsh_gt #(\unalign*8) orr r6, r6, r2, lsh_gt #(\unalign*8)