2a0d45ae6c
The pass should run once at the end of shader compilation, for a4xx onwards. It iterates texture sampling instructions and mark those eligibile for pre-dispatch by changing the tex op from 'tex' to 'tex_prefetch'. An instruction is eligibile if: * The coordinate is a vector where all its components come from a shader input. * The order of the components match exactly that of the input (no swizzles). * The instruction is in the 'main' function, and in the outer most-block. The first two restrictions were arrived to empirically, so more testing could tighten or loosen it. The 3rd restriction is there to allow moving the instructions eligible for pre-dispatch to the beginning of the shader, so that we don't block the registers holding the result for too long. Signed-off-by: Rob Clark <robdclark@chromium.org> Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
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