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brw: Optimize 16-bit texture fetches later

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At the point we were calling this, we hadn't necessarily cleaned up
derefs via nir_lower_vars_to_ssa, nor movs/vecs via copy propagation,
so it wasn't necessarily easy for this pass to see the actual usage of
the destination.

Moving this later allows us to detect f2f32(txf(...)) and avoid
converting it to a 16-bit txf (why convert with ALU instructions
when the sampler could do it for us?).

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Sushma Venkatesh Reddy <sushma.venkatesh.reddy@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31750>
This commit is contained in:
Kenneth Graunke 2024-10-17 16:00:44 -07:00 • committed by Marge Bot
parent ea478efa2e
commit 834b919f6a
1 changed files with 6 additions and 6 deletions
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12
src/intel/compiler/brw_nir.c
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@ -1019,12 +1019,6 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir,
OPT(nir_lower_alu_to_scalar, NULL, NULL);
struct nir_opt_16bit_tex_image_options options = {
.rounding_mode = nir_rounding_mode_undef,
.opt_tex_dest_types = nir_type_float | nir_type_int | nir_type_uint,
};
OPT(nir_opt_16bit_tex_image, &options);
if (nir->info.stage == MESA_SHADER_GEOMETRY)
OPT(nir_lower_gs_intrinsics, 0);
@ -1084,6 +1078,12 @@ brw_preprocess_nir(const struct brw_compiler *compiler, nir_shader *nir,
brw_nir_optimize(nir, devinfo);
struct nir_opt_16bit_tex_image_options options = {
.rounding_mode = nir_rounding_mode_undef,
.opt_tex_dest_types = nir_type_float | nir_type_int | nir_type_uint,
};
OPT(nir_opt_16bit_tex_image, &options);
OPT(nir_lower_doubles, opts->softfp64, nir->options->lower_doubles_options);
if (OPT(nir_lower_int64_float_conversions)) {
OPT(nir_opt_algebraic);