[llvm-bugs] [Bug 31887] New: speccpu2000 175.vpr runtime failure when compiled with LLVM -Ofast x86_64

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https://llvm.org/bugs/show_bug.cgi?id=31887

            Bug ID: 31887
           Summary: speccpu2000 175.vpr runtime failure when compiled with
                    LLVM -Ofast x86_64
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: brzycki at gmail.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

SPECCPU 2000 175.vpr produces the following runtime error:

Error in check_rr_graph:  node 2 connects to node 8 2 times.

This only happens with the following configuration: x86_64, -Ofast.  The test
is with the reference run dataset and the command line arguments:

./vpr net.in arch.in place.in route.out -nodisp -route_only -route_chan_width
15 -pres_fac_mult 2 -acc_fac 1 -first_iter_pres_fac 4 -initial_pres_fac 8

This error does not happen on aarch64 with -Ofast. Likewise, other optimization
levels -O0, -O1, -O2, -O3 on x86_64 also do not fail.

Using -Ofast -fno-fast-math also runs correctly.

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