Jakub Jelinek wrote:

> Well, we don't want to regress performance wise on one of the most important
> primary targets.  I don't care that much if the RTL/backend work is done
> together with the patch, or as a follow-up during stage1/3, but it should be
> done, the testcases I've posted can be used as a basis of a P1 runtime
> performance regression.

It should be sufficient to file a bug about inefficient 64-bit constant 
expansions on
x64. I didn't see a significant difference in my benchmarking of it on x64, so 
I'd say
it's only a performance regression if large benchmarks regress measurably (quite
unlikely).

Wilco

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