[LLVMbugs] [Bug 2493] New: lli / JIT bug in KMeans

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=2493

           Summary: lli / JIT bug in KMeans
           Product: new-bugs
           Version: unspecified
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: new bugs
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: torvald at se.inf.tu-dresden.de
                CC: llvmbugs at cs.uiuc.edu


I see sth that looks like an lli/JIT bug. The program is the KMeans benchmark
from the STAMP benchmark suite (http://stamp.stanford.edu). 
Overwrite ./common/Defines.common.mk with the attached files to make CC/LD 
customizable.

in ./kmeans, for
./kmeans -m40 -n40 -t0.00001 -i inputs/random-n65536-d32-c16.txt -p 1 :

make -f Makefile.seq clean

CC='llvm-gcc' LD='llvm-gcc -lm' make -f Makefile.seq
-->works, but is slower than gcc (35s vs 16s on my Intel 32b system)

CC='llvm-gcc -emit-llvm' LD='llvm-ld -lm' make -f Makefile.seq
--> does not work (lot's of NaN's in the output, and much faster (11s)) and
uses lli

CC='llvm-gcc -emit-llvm' LD='llvm-ld -lm -disable-opt' make -f Makefile.seq
--> does not work either, and uses lli

CC='llvm-gcc -emit-llvm' LD='llvm-ld -lm -disable-opt -native' make -f --> 
looks as if it would work (and is faster, 16s)

CC='llvm-gcc -emit-llvm' LD='llvm-ld -lm -native' make -f Makefile.seq
--> looks as if it would work (and is faster, 16s)

CC='llvm-gcc -emit-llvm' LD='llvm-ld -link-as-library' make -f Makefile.seq
llc -f -o kmeans.s kmeans
gcc -o kmeans kmeans.s -lm -lpthread
--> looks as if it would work (and is faster, 16s)


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