Hello, llvmdev. I'm a student from the Moscow State University and I
started to work with the LLVM project.
First, I have to compare its profiling ways and I got a little problem. It
hangs when I try to run optimal edge profiling.
Nothing happens right after the command "opt a.bc -profile-loader -o
b.bc"
which tries to load optimal edge profile from the llvmprof.out file. I mean
it starts to compute but never ends (I checked CPU Usage).
For example, a log of my actions:
anon at anonVB:~/MiBench/
automotive/qsort$ clang qsort_large.c -emit-llvm -c -o a.bc
anon at anonVB:~/MiBench/automotive/qsort$ opt a.bc
-insert-optimal-edge-profiling -O2 -o a_oep.bc
anon at anonVB:~/MiBench/automotive/qsort$ llc a_oep.bc -O2 -o a.s
anon at anonVB:~/MiBench/automotive/qsort$ clang a.s ./libprofile_rt.so -O2 -o
a
anon at anonVB:~/MiBench/automotive/qsort$ ./a input_large.dat > out.txt
anon at anonVB:~/MiBench/automotive/qsort$ opt a_oep.bc -profile-loader
-block-placement -O2 -o a_opt.bc
*waited for a few minutes*
^C
Is it a bug or just me doing something wrong?
Also I notice that edge profiling optimizations make MiBench programs work
slower. (I use -block-placment option for optimization).
I use Ubuntu 11.10.
Yours truly, Rodion Mulyukov.
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