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nir: assign IO bases in nir_lower_io_passes

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Reviewed-by: Qiang Yu <yuq825@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21861>
This commit is contained in:
Marek Olšák 2023-02-28 14:59:09 -05:00 • committed by Marge Bot
parent bd9ea4b5bc
commit d29dd3333b
1 changed files with 18 additions and 0 deletions
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18
src/compiler/nir/nir_lower_io.c
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@ -3122,6 +3122,10 @@ type_size_vec4(const struct glsl_type *type, bool bindless)
return glsl_count_attribute_slots(type, false);
}
/**
* This runs all compiler passes needed to lower IO, lower indirect IO access,
* set transform feedback info in IO intrinsics, and clean up the IR.
*/
void
nir_lower_io_passes(nir_shader *nir)
{
@ -3156,6 +3160,20 @@ nir_lower_io_passes(nir_shader *nir)
NIR_PASS_V(nir, nir_lower_io, nir_var_shader_out | nir_var_shader_in,
type_size_vec4, nir_lower_io_lower_64bit_to_32);
/* If IO is lowered before var->data.driver_location is assigned, driver
* locations are all 0, which means IO bases are all 0. It's not necessary
* to set driver_location before lowering IO because the only thing that
* identifies outputs is their semantic, and IO bases can always be
* computed from the semantics.
*
* This assigns IO bases from scratch, using IO semantics to tell which
* intrinsics refer to the same IO. If the bases already exist, they
* will be reassigned, sorted by the semantic, and all holes removed.
* This kind of canonicalizes all bases.
*/
NIR_PASS_V(nir, nir_recompute_io_bases,
nir_var_shader_in | nir_var_shader_out);
/* nir_io_add_const_offset_to_base needs actual constants. */
NIR_PASS_V(nir, nir_opt_constant_folding);
NIR_PASS_V(nir, nir_io_add_const_offset_to_base, nir_var_shader_in |