[LLVMbugs] [Bug 1473] NEW: dagcombine miscompilation
bugzilla-daemon at cs.uiuc.edu
bugzilla-daemon at cs.uiuc.edu
Wed May 30 09:16:35 PDT 2007
http://llvm.org/bugs/show_bug.cgi?id=1473
Summary: dagcombine miscompilation
Product: libraries
Version: trunk
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Common Code Generator Code
AssignedTo: unassignedbugs at nondot.org
ReportedBy: sabre at nondot.org
dag combine is miscompiling this on ppc:
define i8 @foo(i16 zext %a) zext {
entry:
%tmp2 = lshr i16 %a, 10 ; <i16> [#uses=1]
%tmp23 = trunc i16 %tmp2 to i8 ; <i8> [#uses=1]
%tmp4 = shl i8 %tmp23, 1 ; <i8> [#uses=1]
%tmp5 = and i8 %tmp4, 2 ; <i8> [#uses=1]
ret i8 %tmp5
}
-Chris
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