[vta,vta4.3,trunk?] avoid accidental moving of death notes in combine
Alexandre Oliva
aoliva@redhat.com
Wed Sep 10 08:16:00 GMT 2008
move_deaths(), in combine, will happily take outdated last_death from
different BBs and try to move death notes, if the LUID of a REG's
last_death, within its own BB happens, to be between the LUIDs of two
combined insns, even though it doesn't make sense to compare LUIDs of
insns in different BBs.
I noticed this with -fcompare-debug, because a REG_DEAD note moved
about, because debug insns caused the LUIDs to accidentally pass the
tests.
This patch avoids the accident. I don't have any testcase that
doesn't involve debug insns, and even that doesn't cause executable
code changes. I'm going ahead and installing it in vta and vta4.3.
Should I install it in the trunk as well?
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Alexandre Oliva http://www.lsd.ic.unicamp.br/~oliva/
Free Software Evangelist oliva@{lsd.ic.unicamp.br, gnu.org}
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