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[POWERPC] Add hand-coded assembly strcmp

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We have an assembly version of strncmp for the bootwrapper, but not
for the kernel, so we end up using the C version in the kernel.  This
takes the strncmp code from the bootup and copies it to the kernel
proper, adding two instructions so it copes correctly with len==0.

Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Steven Rostedt
2008-03-01 03:04:57 +11:00
committed by Paul Mackerras
parent 4df4441e41
commit 0119536cd3
3 changed files with 17 additions and 0 deletions
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14
arch/powerpc/lib/string.S
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@@ -75,6 +75,20 @@ _GLOBAL(strcmp)
beq 1b
blr
_GLOBAL(strncmp)
PPC_LCMPI r5,0
beqlr
mtctr r5
addi r5,r3,-1
addi r4,r4,-1
1: lbzu r3,1(r5)
cmpwi 1,r3,0
lbzu r0,1(r4)
subf. r3,r0,r3
beqlr 1
bdnzt eq,1b
blr
_GLOBAL(strlen)
addi r4,r3,-1
1: lbzu r0,1(r4)