: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: bradfier at fstab dot me
Target Milestone: ---
Follow up from ML post here: [1]
I tried compiling the following simple function with different -march flags in
-m32 mode:
> uint64_t sum(uint64_t a, uint64_
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83068
--- Comment #1 from Richard Bradfield ---
And as usual I forget to mention these things:
I am compiling everything using gcc trunk, at commit r254929 from Sun Nov 19
This behaviour is not present in GCC 7.2
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83068
--- Comment #3 from Richard Bradfield ---
I bisected forward from a few months ago.
The proximate cause is commit r253934, specifically the reduction in cost of
the SSE Load & Store ops, and the costs of moving SSE to and from integer regs.
The
