[Mesa-dev] [PATCH 2/3] i965/fs: Allow CSE to handle MULs with negated arguments.

[Matt Turner]

On Wed, Feb 11, 2015 at 2:54 PM, Matt Turner <mattst88 at gmail.com> wrote:
> mul x, -y is equivalent to mul -x, y; and mul x, y is the negation of
> mul x, -y.
>
> total instructions in shared programs: 5937689 -> 5929512 (-0.14%)
> instructions in affected programs:     871152 -> 862975 (-0.94%)
> helped:                                4228
> HURT:                                  17
> GAINED:                                12

Tomorrow, this patch will have been on the list for seven weeks (this
thread is a resend). I'm tired of waiting for review, so I've gone
ahead and pushed it.

The updated shader-db stats are:

With NIR:
total instructions in shared programs: 6167779 -> 6161193 (-0.11%)
instructions in affected programs:     983511 -> 976925 (-0.67%)
helped:                                4106
HURT:                                  16
GAINED:                                18
LOST:                                  7

Without NIR:
total instructions in shared programs: 6192323 -> 6185299 (-0.11%)
instructions in affected programs:     987875 -> 980851 (-0.71%)
helped:                                4146
HURT:                                  16
GAINED:                                16
LOST:                                  0