http://llvm.org/bugs/show_bug.cgi?id=2563
Summary: SimplifyCFG is not collapsing unneeded switches
Product: libraries
Version: trunk
Platform: PC
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=1841)
--> (http://llvm.org/bugs/attachment.cgi?id=1841)
Example bitcode
In the attached testcase, note the blocks:
bb4.i.i: ; preds = %grad.exit21.i
switch i32 %154, label %bb9.i.i [
i32 12, label %bb12.i.i
i32 14, label %bb12.i.i
]
bb9.i.i: ; preds = %bb4.i.i
br label %bb12.i.i
bb12.i.i:
...
The switch in bb4.i.i is unnecessary, as is bb9.i.i. SimplifyCFG (or some
other pass) should simplify this away, but doesn't. This idiom occurs multiple
times in this case, probably as a result of LICM.
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