[Mesa-dev] [PATCH 0/2] i965: Simulate MAD opcode with gen<6

[Eric Anholt]

Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com> writes:

> These patches allow MAD opcode to be used with pre gen6 hardware.
> Instead of failing on emitting MAD there will be emitted MUL and ADD 
> to simulate MAD.
>
> I tried this with piglit on ILK (gen5) and did not see regression.

This hides the MUL and ADD from instruction scheduling, which I expect
to make performance worse.  What was the motivation for this?
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