Ian Romanick <[email protected]> writes: > On 05/21/2013 06:11 PM, Eric Anholt wrote: >> i965 and radeon use ra_set_node_reg() to force payload registers to >> specific registers while exposing those registers to the allocator still. >> We were treating those register nodes as unsuccessfully allocated in the >> ra_simplify() step, leading to walking the registers again to do >> optimistic coloring even if there was nothing left ot do. > ^^ to > > How would this bug manifest? How do we know this fixes it? From the > other commit messages, I suspect this only shows with patches 4 and 5. > Yeah?
I noticed it stepping through the register allocator while debugging my conservative coalescing changes (not sent out for review).
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