[Bug rtl-optimization/41862] [4.5 Regression] -fgcse-sm causes bootstrap comparison failures

[zsojka at seznam dot cz]

------- Comment #9 from zsojka at seznam dot cz  2009-12-24 20:24 -------
Thank you for commiting that patch. I am also receiving bootstrap comparison
failures at x86_64 (r155455, -O2 -fgcse-sm):
gcc/double-int.o differs
libcpp/expr.o differs

r155434 without -fgcse-sm bootstraps fine (I didn't test r155455 without
-fgcse-sm, yet)
When I applied patch from comment #2 (it does the same as the commited patch)
to r153685, it bootstraped fine as well.
There are (used to be?) "random" cfgloopmanip.o comparison failures appearing
when building from gentoo's sources (not vanilla, so I didn't report it, and I
wasn't able to reproduce it) (those sources are weekly snapshots - some
snapshots managed to compile, some didn't).
I hope this information can be in some way useful.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41862