[LLVMbugs] [Bug 14025] New: clang/LLVM miscompiles TSVC benchmarks on Darwin

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14025

             Bug #: 14025
           Summary: clang/LLVM miscompiles TSVC benchmarks on Darwin
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: MacOS X
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: hfinkel at anl.gov
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Some small number of the TSVC loop benchmarks that I recently added to the test
suite seem to be miscompiled on Darwin.

For example, in Equivalencing-flt, test S1421
returns 17208 when compiled with clang on Darwin x86_64 (going back at
least to LLVM 2.9). gcc on Darwin returns 16000. Both clang and gcc on
Linux on x86_64 return 16000. Both clang and gcc on PowerPC return
16000.

http://llvm.org/perf/db_default/v4/nts/4568 shows the current tests affected
are:
MultiSource/Benchmarks/TSVC/Equivalencing-dbl/Equivalencing-dbl
MultiSource/Benchmarks/TSVC/Equivalencing-flt/Equivalencing-flt
MultiSource/Benchmarks/TSVC/GlobalDataFlow-dbl/GlobalDataFlow-dbl

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