[Mesa-dev] Mesa (master): mesa: document instructions ir_to_mesa emits
idr at freedesktop.org
Mon May 9 15:00:23 PDT 2011
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On 05/09/2011 11:03 AM, Marek Olšák wrote:
> Module: Mesa
> Branch: master
> Commit: 801fbdf286bed58435ca3a9008104b098717ed9b
> URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=801fbdf286bed58435ca3a9008104b098717ed9b
> Author: Marek Olšák <maraeo at gmail.com>
> Date: Mon May 9 18:18:56 2011 +0200
> mesa: document instructions ir_to_mesa emits
> GLSL stopped using:
> BRA, EXP, LOG, LRP, NRM3, NRM4, XPD.
> GLSL started using:
> KIL, SCS, SSG, SWZ.
> (omg why SWZ? isn't proc_src_register flexible enough?)
The problem is that some architectures (e.g., Nvidia, i965) can only use
that flexibility with the special SWZ instruction. As far as I'm aware,
the back-ends for architectures that can use that flexibility (e.g.,
i915) aren't expecting it. I'm not sure prog_exec will work with that
> GLSL doesn't use these opcodes some Radeons do support:
> ARR, DP2A, DST, LRP, XPD.
> These opcodes are now unused:
> AND, NOT, NRM3, NRM4, OR, XOR.
> (plus maybe the NV extensions which are unused by Gallium)
> In addition to that, we don't use two-dimensional indirect addressing,
> which the Mesa IR can do.
You mean things like:
MOV R0, array[A0.x + 5];
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