[LLVMbugs] [Bug 5204] New: if-conversion of tail blocks
bugzilla-daemon at cs.uiuc.edu
bugzilla-daemon at cs.uiuc.edu
Thu Oct 15 15:22:23 PDT 2009
http://llvm.org/bugs/show_bug.cgi?id=5204
Summary: if-conversion of tail blocks
Product: new-bugs
Version: trunk
Platform: Macintosh
OS/Version: MacOS X
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: unassignedbugs at nondot.org
ReportedBy: deeppatel1987 at gmail.com
CC: llvmbugs at cs.uiuc.edu
In test/CodeGen/Thumb2/2009-10-15-ITBlockBranch.ll, there's a diamond-shaped
if-conversion at the end of the function. There is a BX_RET in each side of the
diamond that become LDM_RET. Since one branch only consists of this return and
no work, if-conversion should flip the comparison to avoid having run over the
predicated SUB.
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