Matt Turner <matts...@gmail.com> writes: > On Wed, Apr 10, 2013 at 11:54 AM, Eric Anholt <e...@anholt.net> wrote: >> This instruction doesn't update its IR destination, it just moves from >> payload to f0. This caused the dead code elimination pass I'm adding to >> dead-code-eliminate the first step of interpolation. > > This was because it had a destination that was never read?
We were putting a vgrf in the destination, even though the instruction didn't do anything to any vgrf. We then inferred incorrect things about what had happened with the vgrf.
pgpZRVf84xxlh.pgp
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