On Wed, Apr 30, 2014 at 07:53:30AM -0400, Lennart Sorensen wrote:
> On Tue, Apr 29, 2014 at 04:47:26PM -0400, Lennart Sorensen wrote:
> > It looks to me as if the problem might be here:
> >
> > sub rWORD1, r0101, rTMP2
>
> No that's not it. Still haven't figured it out.
Does this actually fail with input like this:
strcmp("", "bb")
As far as i can tell that would return 0.
I am seeing this (with my C version of the assembly code since I have
no sparc to run it on):
rWORD1: 0000000000000000 rWORD2: 6100000000000000
aligned_loop_entry
aligned_loop
rTMP2: 00fefefefefefeff rSTRXOR: 6100000000000000 rTMP1: 8080808080808080
common_endstring
rTMP2: 0000000000000000 o1: 8080808080808081
rTMP2: 7f7f7f7f7f7f7f7f
rTMP1: 8080808080808080
rTMP1: ff01010101010101
Result: strcmptest("", "a") = 0
rWORD1: 6100000000000000 rWORD2: 0000000000000000
aligned_loop_entry
aligned_loop
rTMP2: 61fefefefefefeff rSTRXOR: 6100000000000000 rTMP1: 8080808080808080
common_endstring
rTMP2: 6100000000000000 o1: 8080808080808081
rTMP2: e07f7f7f7f7f7f7f
rTMP1: 0080808080808080
rTMP1: 0001010101010101
Result: strcmptest("a", "") = 1
Clearly ending up with ff in the mask that was supposed to contain 00
and 01 only is a problem.
--
Len Sorensen
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