"Steve Ellcey " <sell...@mips.com> writes: > Two MIPS specific tests started failing a few days ago, this patch fixes > them. The tests are trying to check that a performance optimization is > done and that one constant is derived from another and not simply loaded > as a completely new constant. > > Post 4.9 changes have affected which constant gets loaded and which one > gets derived (and how it is derived) from it. The new code looks as > good as the old code: > > Old: > > li $5,305397760 # 0x12340000 > addiu $4,$5,1 > addiu $5,$5,-1 > > New: > > li $5,305332224 # 0x12330000 > ori $5,$5,0xffff > addiu $4,$5,2
This isn't as good though -- $4 now depends on two previous instructions. Do you know which specific change was responsible? Thanks, Richard
