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arc: memcmp - fix zero-delay loop utilization

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It's prohibited to put branch instruction in the very end of zero-delay
loop. On execution this causes "Illegal instruction" exception.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Igor Guryanov <guryanov@synopsys.com>
This commit is contained in:
Igor Guryanov 2015-02-03 13:58:09 +03:00 committed by Alexey Brodkin
parent 7f641d53bb
commit f958a91fa5
1 changed files with 2 additions and 0 deletions
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2
arch/arc/lib/memcmp.S
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@ -29,6 +29,7 @@ memcmp:
ld.a %r4, [%r0, 8] ld.a %r4, [%r0, 8]
ld.a %r5, [%r1, 8] ld.a %r5, [%r1, 8]
brne WORD2, %r12, .Lodd brne WORD2, %r12, .Lodd
nop
.Loop_end: .Loop_end:
asl_s SHIFT, SHIFT, 3 asl_s SHIFT, SHIFT, 3
bhs_s .Last_cmp bhs_s .Last_cmp
@ -105,6 +106,7 @@ memcmp:
ldb.a %r4, [%r0, 2] ldb.a %r4, [%r0, 2]
ldb.a %r5, [%r1, 2] ldb.a %r5, [%r1, 2]
brne %r3, %r12, .Lbyte_odd brne %r3, %r12, .Lbyte_odd
nop
.Lbyte_end: .Lbyte_end:
bcc .Lbyte_even bcc .Lbyte_even
brne %r4, %r5, .Lbyte_even brne %r4, %r5, .Lbyte_even