https://bugs.kde.org/show_bug.cgi?id=386945
--- Comment #42 from Aaron Sawdey <acsaw...@linux.ibm.com> ---
I think you're on the right track with ldbrx. The only difference between the
code that gcc is generating and what is in glibc is ldbrx vs ld, here is what
is in glibc trunk:
/* For short string up to 16 bytes, load both s1 and s2 using
unaligned dwords and compare. */
ld r8,0(r3)
ld r10,0(r4)
cmpb r12,r8,r0
cmpb r11,r8,r10
orc. r9,r12,r11
bne cr0,L(different_nocmpb)
The glibc code has a couple more instructions afterwards because we don't have
a count trailing zeros instruction that would make the most sense for the byte
ordering that ld gives you on little endian.
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