https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282
--- Comment #20 from Martin Jambor <jamborm at gcc dot gnu.org> --- (In reply to mcccs from comment #17) > [...] > > The problem is that the parameter pointer is not set to the argument so > dereferencing it causes a segfault. Dumping all the passes, this problem is > first present in the output of the pass "x.c.100t.fixup_cfg3.c" as compiled > with the modified GCC with -O3 -fno-dce -fno-ipa-cp -fno-tree-dce -fno-dse > -fno-tree-dse > This looks pretty much like a bug that... (In reply to mcccs from comment #15) > There's indeed a miscompilation and I've confirmed it's still present in the > current trunk. With -fno-dce -fno-ipa-cp -fno-tree-dce the issue was visible > until r12-248 which made the issue latent. So I added -fno-tree-dse and then > it was made latent by r12-1848. So I added: ...the commit r12-1848 aimed to fix. What makes you think it is "latent?" > [...] > > Download the minimized testcase from > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110282#c14 > > -O3 -fno-dce -fno-ipa-cp -fno-tree-dce -fno-dse -fno-tree-dse > > sed -i -e 's/mark_dead_statements (m_oparms\[i\]/(void)3;\/\//g' > ./gcc/gcc/ipa-param-manipulation.cc > This looks like undoing a fix for the problem you described in comment#17, I'm afraid.
