http://llvm.org/bugs/show_bug.cgi?id=10814
Summary: MachineSink creates zombie defines
Product: new-bugs
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: release blocker
Priority: P
Component: new bugs
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Created an attachment (id=7182)
--> (http://llvm.org/bugs/attachment.cgi?id=7182)
Fix for the bug
After a critical edge split the flags of the successor were not reflected in
the new block, which allowed later instructions to sink even though they write
the EFLAGS.
The example below shows the problem. Unfortunately there is a test that relies
on this bug, although the problem is that the EFLAGS are live-in when they
should not be. The patch disables this test for now.
I attached a fix for the bug, however it was not accepted yet since it makes
the test XFAIL, and I (still ) do not have time to fix it, but I don't want the
issue ot be fogotten, so I created the bug report instead.
See:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20110725/125216.html
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