On Mon, Dec 22, 2014 at 6:30 PM, Ian Romanick <i...@freedesktop.org> wrote: > On 12/21/2014 03:23 PM, Matt Turner wrote: >> This series adds support to i965's vec4 backend for using vector-float >> immediates. The shader-db results are pretty nice: >> >> total instructions in shared programs: 5889529 -> 5876617 (-0.22%) >> instructions in affected programs: 465347 -> 452435 (-2.77%) >> >> and there's still room for improvement. It helps 4914 shaders and hurts >> none. 50 Valley and Heaven shaders are cut by 30% and there are a few >> that do >> >> mov(8) g25<1>F [-1.5F, -1.5F, -0.5F, -1.5F]VF >> mov(8) g27<1>F [ 0.5F, -1.5F, 1.5F, -1.5F]VF >> mov(8) g29<1>F [-1.5F, -0.5F, -0.5F, -0.5F]VF >> mov(8) g31<1>F [ 0.5F, -0.5F, 1.5F, -0.5F]VF >> mov(8) g33<1>F [-1.5F, 0.5F, -0.5F, 0.5F]VF >> mov(8) g35<1>F [ 0.5F, 0.5F, 1.5F, 0.5F]VF >> mov(8) g37<1>F [-1.5F, 1.5F, -0.5F, 1.5F]VF >> mov(8) g39<1>F [ 0.5F, 1.5F, 1.5F, 1.5F]VF >> >> before using each register once in a MAD instruction. I'll have to think >> more about a general solution that would optimize that into a single >> >> mov(8) g25<1>F [-1.5F, 1.5F, -0.5F, 0.5F]VF >> >> and then sources it 8 times with different swizzles. Probably something >> like the constant-combining pass I've floated for the FS backend. > > There is (was?) code to do a similar thing for program constants in the > assembly shader compiler. Maybe there's something there to borrow? > It's a bit of a long shot...
I see _mesa_lookup_parameter_constant() which will return a constant and a swizzle. That's probably what you're thinking of. _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
