http://llvm.org/bugs/show_bug.cgi?id=2619
Summary: poor optimization in presence of bitcast'ed pointer
Product: libraries
Version: trunk
Platform: Macintosh
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Scalar Optimizations
AssignedTo: [EMAIL PROTECTED]
ReportedBy: [EMAIL PROTECTED]
CC: [email protected]
Created an attachment (id=1874)
--> (http://llvm.org/bugs/attachment.cgi?id=1874)
failing testcase
The attached test case (foo.ll) should optimize down to a constant return. I
believe the presence of the bitcast is inhibiting further optimization though.
A relatively simple fix (I believe) would be to reduce the stores through a
bitcasted pointer to separate stores into the proper type when obvious.
Alternatively, this code arises from a lowered memset, which could be changed
to lower in a type specific way. The original .ll is also attached.
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