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nir: Constant fold sampler/texture offsets 

Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16171>
This commit is contained in:
Jason Ekstrand 2022-04-26 11:34:35 -05:00 committed by Marge Bot
parent 9332598b26
commit e24d8760e9
1 changed files with 22 additions and 0 deletions
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22
src/compiler/nir/nir_opt_constant_folding.c
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@ -329,11 +329,33 @@ try_fold_txb_to_tex(nir_builder *b, nir_tex_instr *tex)
return false;
}
static bool
try_fold_tex_offset(nir_tex_instr *tex, unsigned *index,
nir_tex_src_type src_type)
{
const int src_idx = nir_tex_instr_src_index(tex, src_type);
if (src_idx < 0)
return false;
if (!nir_src_is_const(tex->src[src_idx].src))
return false;
*index += nir_src_as_uint(tex->src[src_idx].src);
nir_tex_instr_remove_src(tex, src_idx);
return true;
}
static bool
try_fold_tex(nir_builder *b, nir_tex_instr *tex)
{
bool progress = false;
progress |= try_fold_tex_offset(tex, &tex->texture_index,
nir_tex_src_texture_offset);
progress |= try_fold_tex_offset(tex, &tex->sampler_index,
nir_tex_src_sampler_offset);
/* txb with a bias of constant zero is just tex. */
if (tex->op == nir_texop_txb)
progress |= try_fold_txb_to_tex(b, tex);