Compilation performance comparison of 3.5.0 and TreeSSA trees on MICO sources as requested in: [tree-ssa] Merge status 2004-05-03

[Laurent GUERBY]

On Wed, 2004-05-05 at 20:35, Joe Buck wrote:
> The purpose of doing some optimization is to make -O0 *faster*.  We've
> already got a 20% speed degradation any you want to allow 5% *more*?

You want to allow some room IMHO:

- there will always be some cases where -Og is slower than -O0
and we don't want endless case by case discussions

- If the generated file size is reduced by 50% for 10% longer compile
time, I'd like to get such things in.

Nobody will notice 44 minutes vs 40 minutes of full app compilation,
everyone in a edit/compile one file/link full app/debug cycle will
notice immediately a 50% reduction in link time.

Laurent