[llvm-bugs] [Bug 35618] New: Instcombine hangs because of '[InstCombine] PR35354: Convert store...' (r320157)

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Mon Dec 11 02:14:20 PST 2017


            Bug ID: 35618
           Summary: Instcombine hangs because of '[InstCombine] PR35354:
                    Convert store...' (r320157)
           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 19534
  --> https://bugs.llvm.org/attachment.cgi?id=19534&action=edit
reduced testcase

While building SystemZ benchmarks (SPEC), I discovered that one clang process
got stuck which I bisected to r320157. When I reverted it locally, things
worked again as normal.

Attached reduced test case, run with

bin/opt -mtriple=s390x-ibm-linux -S -mcpu=z13 -O3 tc_instcomb_hang.ll

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