[Bug target/57637] Miscompare on 178.galgel in SPEC2000 on arm

[zhenqiang.chen at linaro dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57637

--- Comment #4 from zhenqiang.chen at linaro dot org ---
Root cause:

For ARM, gcc might generate cond_exec insns before shrink-wrapping. But
DF_LR_BB_INFO (bb)->def does not include def info from cond_exec insns. So the
check in function move_insn_for_shrink_wrap is not enough.

We'd check DF_LIVE_BB_INFO (bb)->gen.

Kyrill,

Please try the attached patch. If it works, I will send it for community
review.

Thanks!
-Zhenqiang