I could not make these options work, they do not produce any output --neither to the stdout, nor to a file. I tried in different machines with different versions of gcc. Do you have any idea what the problem could be? Thanks. ----- Original Message ---- From: Ian Lance Taylor <iant@xxxxxxxxxx> To: Hasan MUTLU <bigpatboy@xxxxxxxxx> Cc: gcc-help@xxxxxxxxxxx Sent: Wed, April 13, 2011 10:08:57 PM Subject: Re: Parallel execution Hasan MUTLU <bigpatboy@xxxxxxxxx> writes: > I have implemented a multiprocessor system and want to run a code on my system. > > My idea is to have a compiler support that tells me which instructions could be > > executed in parallel without any problems. In other words, I have a given code > that is written without considering any kind of parallelization (a standard C > code written for single processor) and I want my compiler to tell me which > instructions don't have any kind of dependencies, so could be run in parallel. > This might remind you VLIW, which deals more or less with the same problem. You > > can ignore how my hardware deals with this information. My question is how >close > > I can get to this information with gcc compiler. In other words, how can I > determine instruction dependencies, the instructions that could be run in > parallel? Any command line options (if there is) or a pointer in the source >code > > of gcc would be helpful. gcc doesn't support this directly. You can get the information by using -fdump-rtl-sched2. Also fiddle with -fsched-verbose=N. Ian
