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

[Mike Stump]

On Tuesday, May 4, 2004, at 01:50 PM, Karel Gardas wrote:
> MICO doesn't look good. I've compared todays source trees:

> File		350-O0	TSSA-O0	Delta%	350-O2	TSSA-O2

> Sum		523.2	649.36	-19.43	774.7	904.11	-14.31
>
> Conclusion: compile time regressions for both -O0 and -O2 compilation.

Thanks.  While I'll happily take the 14% hit for optimized code, the 
20% drop for -O0 I want to bitch about.  Last time we lost 34% in one 
tiny patch, we lost, and the work went in anyway.  That was almost ok, 
as we just reverted the work that caused the regression in our tree.  
However, we have no ability to `revert' treessa for -O0 to gain the 20% 
back.

I'd like ask people to see if there is anyway to get that back.  If not 
all of it, part of it?