http://llvm.org/bugs/show_bug.cgi?id=3290
Summary: scalarrepl doesn't promote alloca in 2008-03-24-
BitField-And-Alloca.c
Product: libraries
Version: 1.0
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P2
Component: Scalar Optimizations
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
This is split off from bug 3232, where we learned that diabling gcc's inliner
caused a perf regression in 2008-03-24-BitField-And-Alloca.c because scalarrepl
isn't promoting the allocas anymore.
This in turn is because of how the struct is being passed by value to a
function: due to the ABI lowering stuff in the front-end, it is passed as an
i64, so we get this code, which confuses scalarrepl:
%struct.Key = type { { i32, i32 } }
...
%iospec = alloca %struct.Key ; <%struct.Key*> [#uses=3]
...
%2 = bitcast %struct.Key* %iospec to i64* ; <i64*>
[#uses=1]
store i64 %key_token2, i64* %2, align 8
Perhaps scalarrepl can handle this the same way it handles memcpy.
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