[LLVMbugs] [Bug 14185] New: FMA4 causes segfault with spec cpu2006 "namd" benchmark and miscompare for others

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=14185

             Bug #: 14185
           Summary: FMA4 causes segfault with spec cpu2006 "namd"
                    benchmark and miscompare for others
           Product: clang
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Frontend
        AssignedTo: unassignedclangbugs at nondot.org
        ReportedBy: anitha.boyapati at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified


Important contents of config file are:


#####################################################################
# FP Peak Tuning
#####################################################################

fp=peak=default:
#FIX ffp-contract=fast. Due to dragonegg usign standard
COPTIMIZE    = -O2 -g -march=bdver2 -mavx -mno-fma -save-temps  -mfma4
-ffp-contract=fast
CXXOPTIMIZE  = -O2 -g -march=bdver2 -mavx -mno-fma -save-temps  -mfma4
-ffp-contract=fast


----------------------------------

Run the "namd" from spec cpu2006 as follows:

runspec --action=run --rebuild -r 1 --config=qa_llvm_fma4.cfg --iterations 1
namd --tune=peak




444.namd: copy 0 non-zero return code (exit code=11, signal=0)


****************************************
Contents of namd.err
****************************************
run.sh: line 1:  9835 Segmentation fault     
../run_peak_ref_llvm.0002/namd_peak.llvm --input namd.input --iterations 38
--output namd.out

****************************************
Invalid run; unable to continue.
If you wish to ignore errors please use '-I' or ignore_errors

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