http://llvm.org/bugs/show_bug.cgi?id=20182
Bug ID: 20182
Summary: Missing optimization: linkonce_odr stuff only
referenced by available externally globals is not
discarded
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
consider:
@x = available_externally constant void()* @f
define linkonce_odr void @f() {
ret void
}
define i32 @main() {
%f = load void()** @x
call void %f()
ret i32 0
}
@x references @f. @x will not be emitted, and @f is discardable, so we should
discard it if that's the only reference.
This is relevant for dllimported vftable thunks in the MS ABI, because they are
not actually available externally. We emit them for devirtualization of
thunks, but we cannot actually import them.
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