[LLVMdev] JIT bug?

[Torvald Riegel]

Hi,

I see sth that to me looks like a 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))

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

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)

Any suggestions? Is this a known limitation? Is there more information 
necessary (eg, for a bug report)?

thanks,
Torvald
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