https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91994
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-10-04
Ever confirmed|0 |1
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
liblzma/lzma/lzma_encoder.c and/or liblzma/check/sha256.c are miscompiled.
The good one has
callq 0 <length_update_prices>
cmp %r13,%r14
vmovdqa XXX(%rip),%ymm0
jne
...
vmovdqu %ymm0,XXX(%rbx)
The bad one has
callq 0 <length_update_prices>
cmp %r13,%r14
jne
vmovdqu %ymm0,XXX(%rbx)
length_update_prices clobbers %ymm0, which isn't restored after call.
