[llvm-bugs] [Bug 50090] New: Nary Reassociate pass still hangs on min/max code

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=50090

            Bug ID: 50090
           Summary: Nary Reassociate pass still hangs on min/max code
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Scalar Optimizations
          Assignee: unassignedbugs at nondot.org
          Reporter: chang-sun.lin.jr at intel.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 24794
  --> https://bugs.llvm.org/attachment.cgi?id=24794&action=edit
Test case, hangs reassociation

Attached test case still hangs between 2 min/min reassociation patterns, even
after commit 36b932d6 (which fixed one similar case)

opt --debug --nary-reassociate small.ll

NARY: Found common sub-expr:   %tmp5 = call i64 @llvm.umin.i64(i64 %tmp4, i64
16384)
NARY: Deleting:    %tmp10 = call i64 @llvm.umin.i64(i64 %tmp9, i64 16384)
NARY: Inserting:   %tmp10.nary = call i64 @llvm.umin.i64(i64 %tmp5, i64 %tmp)
NARY: Found common sub-expr:   %tmp2 = call i64 @llvm.umin.i64(i64 %tmp, i64
%tmp1)
NARY: Deleting:    %tmp10.nary = call i64 @llvm.umin.i64(i64 %tmp5, i64 %tmp)
NARY: Inserting:   %tmp10.nary.nary = call i64 @llvm.umin.i64(i64 %tmp2, i64
16384)
NARY: Found common sub-expr:   %tmp5 = call i64 @llvm.umin.i64(i64 %tmp4, i64
16384)
NARY: Deleting:    %tmp10.nary.nary = call i64 @llvm.umin.i64(i64 %tmp2, i64
16384)
NARY: Inserting:   %tmp10.nary.nary.nary = call i64 @llvm.umin.i64(i64 %tmp5,
i64 undef)
.....

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