[LLVMbugs] [Bug 1842] New: dag combiner changes select into and incorrectly
bugzilla-daemon at cs.uiuc.edu
bugzilla-daemon at cs.uiuc.edu
Wed Dec 5 14:48:15 PST 2007
http://llvm.org/bugs/show_bug.cgi?id=1842
Summary: dag combiner changes select into and incorrectly
Product: libraries
Version: trunk
Platform: PC
OS/Version: Linux
Status: NEW
Severity: enhancement
Priority: P2
Component: Common Code Generator Code
AssignedTo: unassignedbugs at nondot.org
ReportedBy: alenhar2 at uiuc.edu
CC: llvmbugs at cs.uiuc.edu
Created an attachment (id=1279)
--> (http://llvm.org/bugs/attachment.cgi?id=1279)
triggers bug
in the attached code, a setcc -> select i8 is transformed into a setcc (which
yields 0 or 1) -> and
which would work if the setcc returned ~0, but it doesn't (and
AlphaTargetLowering.cpp says so).
The selection dag is correct before the dag combiner is run.
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