http://llvm.org/bugs/show_bug.cgi?id=2213
Summary: gvn fails to detect duplicate bitcast
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]
Testcase:
define void @f(i8* %x) {
entry:
%tmp = call i8* @m( i32 12 ) ; <i8*> [#uses=2]
%tmp1 = bitcast i8* %tmp to i32* ; <i32*> [#uses=0]
%tmp2 = bitcast i8* %tmp to i32* ; <i32*> [#uses=0]
ret void
}
declare i8* @m(i32)
"opt -gvn" fails to eliminate the second bitcast. However if you use
%x rather than %tmp in the bitcasts, then the second one is removed.
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