unreachable-loop-pred.ll
1.82 KB
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; RUN: opt -S -loop-simplify -disable-output -verify-loop-info -verify-dom-info < %s
; PR5235
; When loopsimplify inserts a preheader for this loop, it should add the new
; block to the enclosing loop and not get confused by the unreachable
; bogus loop entry.
define void @is_extract_cab() nounwind {
entry:
br label %header
header: ; preds = %if.end206, %cond.end66, %if.end23
br label %while.body115
while.body115: ; preds = %9, %if.end192, %if.end101
br i1 undef, label %header, label %while.body115
foo:
br label %while.body115
}
; When loopsimplify generates dedicated exit block for blocks that are landing
; pads (i.e. innerLoopExit in this test), we should not get confused with the
; unreachable pred (unreachableB) to innerLoopExit.
define align 8 void @baz(i32 %trip) personality i32* ()* @wobble {
entry:
br label %outerHeader
outerHeader:
invoke void @foo()
to label %innerPreheader unwind label %innerLoopExit
innerPreheader:
br label %innerH
innerH:
%tmp50 = invoke i8 * undef()
to label %innerLatch unwind label %innerLoopExit
innerLatch:
%cmp = icmp slt i32 %trip, 42
br i1 %cmp, label %innerH, label %retblock
unreachableB: ; No predecessors!
%tmp62 = invoke i8 * undef()
to label %retblock unwind label %innerLoopExit
; undedicated exit block (preds from inner and outer loop)
; Also has unreachableB as pred.
innerLoopExit:
%tmp65 = landingpad { i8*, i32 }
cleanup
invoke void @foo()
to label %outerHeader unwind label %unwindblock
unwindblock:
%tmp67 = landingpad { i8*, i32 }
cleanup
ret void
retblock:
ret void
}
; Function Attrs: nounwind
declare i32* @wobble()
; Function Attrs: uwtable
declare void @foo()