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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SimplifyCFG] Hang/Assertion `IterCnt++ < 1000 && "Sanity: iterative simplification didn't converge!"' failed."
href="https://bugs.llvm.org/show_bug.cgi?id=52290">52290</a>
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<th>Summary</th>
<td>[SimplifyCFG] Hang/Assertion `IterCnt++ < 1000 && "Sanity: iterative simplification didn't converge!"' failed.
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>new bugs
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
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<th>Reporter</th>
<td>max.kazantsev@azul.com
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org
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<div>
<pre>To reproduce: run "opt -simplifycfg -S" on the following test
; RUN: opt < %s -simplifycfg -S | FileCheck %s
; RUN: opt < %s -passes=simplifycfg -S | FileCheck %s
; FIXME: Fails due to infinite loop in iterativelySimplifyCFG.
define i32 @test(float %arg) gc "statepoint-example" personality i32* ()* @blam
{
bb:
%tmp = call i1 @llvm.experimental.widenable.condition()
br i1 %tmp, label %bb2, label %bb1
bb1: ; preds = %bb
br i1 undef, label %bb7, label %bb5
bb2: ; preds = %bb
%tmp3 = getelementptr inbounds i8, i8 addrspace(1)* undef, i64 16
br i1 undef, label %bb6, label %bb4
bb4: ; preds = %bb2
call void @snork() [ "deopt"() ]
unreachable
bb5: ; preds = %bb1
ret i32 0
bb6: ; preds = %bb2
br label %bb7
bb7: ; preds = %bb6, %bb1
%tmp8 = call i32 (...) @llvm.experimental.deoptimize.i32(i32 10) [ "deopt"()
]
ret i32 %tmp8
}
declare i32* @blam()
declare void @snork()
declare i32 @llvm.experimental.deoptimize.i32(...)
; Function Attrs: inaccessiblememonly nofree nosync nounwind speculatable
willreturn
declare i1 @llvm.experimental.widenable.condition() #0
attributes #0 = { inaccessiblememonly nofree nosync nounwind speculatable
willreturn }
Originally result was hang (and it's same in product). I've added a sanity
assert and it now is failing. It happens due to infinite execution of
iterativelySimplifyCFG. The IR does not change between iterations, so maybe two
transforms are undoing one another.</pre>
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