http://llvm.org/bugs/show_bug.cgi?id=2466
Summary: CodeGenPrepare merges critical edges which are
immediately split again by OptimizeBlock
Product: new-bugs
Version: unspecified
Platform: Other
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Created an attachment (id=1751)
--> (http://llvm.org/bugs/attachment.cgi?id=1751)
testcase .bc
On the attached testcase I noticed that EliminateMostlyEmptyBlocks
was eliminating many blocks which later somehow popped up again.
It turns out that it was eliminating all the critical edges, which
were all restored right after by OptimizeBlock. This seems like a
waste of time and effort: presumably EliminateMostlyEmptyBlocks
should detect this case and leave critical edges alone.
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