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[Bug bootstrap/52041] [4.7 Regression] Bootstrap failure at revision 183650 with --enable-checking=release
- From: "iains at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 30 Jan 2012 18:22:12 +0000
- Subject: [Bug bootstrap/52041] [4.7 Regression] Bootstrap failure at revision 183650 with --enable-checking=release
- Auto-submitted: auto-generated
- References: <bug-52041-4@http.gcc.gnu.org/bugzilla/>
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52041
--- Comment #10 from Iain Sandoe <iains at gcc dot gnu.org> 2012-01-30 18:22:12 UTC ---
the stage3 tree-ssa-strlen.o fails with -fcompare-debug "failure (length)".
An incomplete analysis ... run out of time...
The first mismatched tree dump is 18t.ssa -- with differences like
# DEBUG x => y
but also there are some differences in temporary var numbers.
====
Looking at the asm, there seem to be differences like
+ movl al,%eax
cmp $xxx, %eax
and cltq in stage2 missing in stage 3 -- so size changing instructions.