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nir: constant fold txd with 0 ddx/ddy to txl

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Foz-DB GFX1201:
Totals from 34 (0.04% of 80287) affected shaders:
Instrs: 3111158 -> 3111076 (-0.00%)
CodeSize: 16345020 -> 16344908 (-0.00%); split: -0.00%, +0.00%
Latency: 15378053 -> 15378063 (+0.00%); split: -0.00%, +0.00%
InvThroughput: 2940485 -> 2940477 (-0.00%); split: -0.00%, +0.00%
VClause: 79940 -> 79941 (+0.00%)
Copies: 228205 -> 228159 (-0.02%)
VALU: 1730040 -> 1729994 (-0.00%)

Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36967>
This commit is contained in:
Georg Lehmann
2025-08-24 14:27:41 +02:00
committed by Marge Bot
parent bb3727ce5a
commit d0f4b535fe
1 changed files with 42 additions and 0 deletions
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42
src/compiler/nir/nir_opt_constant_folding.c
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@@ -352,6 +352,45 @@ try_fold_txb_to_tex(nir_builder *b, nir_tex_instr *tex)
return false;
}
static bool
try_fold_txd_to_txl(nir_builder *b, nir_tex_instr *tex)
{
assert(tex->op == nir_texop_txd);
const int ddx_idx = nir_tex_instr_src_index(tex, nir_tex_src_ddx);
const int ddy_idx = nir_tex_instr_src_index(tex, nir_tex_src_ddy);
const int min_lod_idx = nir_tex_instr_src_index(tex, nir_tex_src_min_lod);
if (ddx_idx < 0 || ddx_idx < 0)
return false;
/* min_lod is applied after the sampler bias is added, so we can't use it as lod */
if (min_lod_idx >= 0)
return false;
if (!nir_src_is_const(tex->src[ddx_idx].src) || !nir_src_is_const(tex->src[ddy_idx].src))
return false;
for (unsigned i = 0; i < tex->src[ddx_idx].src.ssa->num_components; i++) {
if (nir_src_comp_as_float(tex->src[ddx_idx].src, i) != 0.0)
return false;
}
for (unsigned i = 0; i < tex->src[ddy_idx].src.ssa->num_components; i++) {
if (nir_src_comp_as_float(tex->src[ddy_idx].src, i) != 0.0)
return false;
}
b->cursor = nir_before_instr(&tex->instr);
nir_steal_tex_src(tex, nir_tex_src_ddx);
nir_steal_tex_src(tex, nir_tex_src_ddy);
nir_def *lod = nir_imm_int(b, 0);
nir_tex_instr_add_src(tex, nir_tex_src_lod, lod);
tex->op = nir_texop_txl;
return true;
}
static bool
try_fold_tex_offset(nir_tex_instr *tex, unsigned *index,
nir_tex_src_type src_type)
@@ -403,6 +442,9 @@ try_fold_tex(nir_builder *b, nir_tex_instr *tex)
/* txb with a bias of constant zero is just tex. */
if (tex->op == nir_texop_txb)
progress |= try_fold_txb_to_tex(b, tex);
/* txd with ddx/ddy of constant zero is just txl. */
if (tex->op == nir_texop_txd)
progress |= try_fold_txd_to_txl(b, tex);
/* tex with a zero offset is just tex. */
progress |= try_fold_texel_offset_src(tex);