http://llvm.org/bugs/show_bug.cgi?id=2295
Summary: incorrect optimization (instcombine)
Product: new-bugs
Version: unspecified
Platform: PC
OS/Version: Windows NT
Status: NEW
Severity: normal
Priority: P2
Component: new bugs
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Created an attachment (id=1621)
--> (http://llvm.org/bugs/attachment.cgi?id=1621)
.ll to demonstrate mis-optimization
Using LLVM 2.2:
llvm-as -f x.ll
opt -instcombine -f x.bc -o x.opt.bc
lli x.bc
lli x.opt.bc
The first outputs (as expected):
90 (Z)
and the second (optimized) incorrectly outputs:
33 (!)
I was unable to get bugpoint to work, but the attached file has been manually
minimized (73 lines). Happens with "opt -std-compile-opts" also, but "opt
-instcombine" is all that's necessary.
It appears two different pointers into allocated memory are being conflated.
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