[llvm-bugs] [Bug 33360] New: SimplifyCFG seems to be stuck in an infinite loop on this test case

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=33360

            Bug ID: 33360
           Summary: SimplifyCFG seems to be stuck in an infinite loop on
                    this test case
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: paulsson at linux.vnet.ibm.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 18593
  --> https://bugs.llvm.org/attachment.cgi?id=18593&action=edit
test case

SINK: instruction can be sunk:   %.pre73.pre.i.i.i4 = load i32, i32* %.pre.i.i,
align 4, !tbaa !2
SINK: #phid values: 2
SINK: Splitting edge
SINK: Sink:   %.pre73.pre.i.i.i4 = load i32, i32* %.pre.i.i, align 4, !tbaa !2
SINK: #phid values: 2
SINK: instruction can be sunk:   %.pre73.pre.i.i.i4 = load i32, i32* %.pre.i.i,
align 4, !tbaa !2
SINK: #phid values: 2
SINK: Splitting edge
SINK: Sink:   %.pre73.pre.i.i.i4 = load i32, i32* %.pre.i.i, align 4, !tbaa !2
SINK: #phid values: 2
SINK: instruction can be sunk:   %.pre73.pre.i.i.i4 = load i32, i32* %.pre.i.i,
align 4, !tbaa !2
SINK: #phid values: 2
SINK: Splitting edge
SINK: Sink:   %.pre73.pre.i.i.i4 = load i32, i32* %.pre.i.i, align 4, !tbaa !2
SINK: #phid values: 2
....

run line:

bin/clang -cc1 -triple s390x-ibm-linux -S -target-cpu z13 -O3  -o /dev/null -x
ir ~/build-dev/test2.bc

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