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agx: Optimize lower_resinfo for cube maps

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We can avoid reading both width and height when the texture is a cube map, and
we do so more simply by relying on CSE+DCE (Alyssa).

Closes: #7541
Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20628>
This commit is contained in:
Hampus Linander 2023-01-08 01:18:55 +01:00 • committed by Alyssa Rosenzweig
parent 9ab1c0d83b
commit b73b5cc71a
1 changed files with 6 additions and 0 deletions
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6
src/asahi/compiler/agx_nir_lower_texture.c
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@ -117,6 +117,12 @@ agx_txs(nir_builder *b, nir_tex_instr *tex)
if (!(nr_comps == 3 && tex->is_array))
depth = nir_imax(b, nir_ushr(b, depth, lod), nir_imm_int(b, 1));
/* Cube maps have equal width and height, we save some instructions by only
* reading one. Dead code elimination will remove the redundant instructions.
*/
if (tex->sampler_dim == GLSL_SAMPLER_DIM_CUBE)
height = width;
comp[0] = width;
comp[1] = height;
comp[2] = depth;