Some benchmarks comparing gcc-3.4.3 and 4.0.0 on PowerPC G5

[Bradley Lucier]

On Jan 2, 2005, at 5:47 AM, Steven Bosscher wrote:

> 3) You say "each compiler was built without checking".  Do you mean
>    built as in "make" instead of "make bootstrap"?

make bootstrap.

About your other comments:

I agree that more thought about which options should be enabled at -O1 
may be helpful.

I didn't run tests with -O2 because -O2 results in uniformly slower run 
times with 3.4.3.

Re:

> 2) You should probably compare columns with matching flags.  Comparing
>    "4.0.0 (no options)" with "3.4.3 -mcpu=G4 -mtune=G5" is not really
>    useful IMHO.

Well, it's interesting to me that tweaking options that are supposed to 
choose more accurately the instruction set and/or the scheduling for a 
specific processor does not uniformly help run times.

Brad