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nir: recompute IO bases after DCE in nir_lower_io_passes

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otherwise the IO bases can be incorrect due to non-DCE'd input loads

Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25394>
This commit is contained in:
Marek Olšák
2023-08-31 10:54:39 -04:00
committed by Marge Bot
parent f37e32b78b
commit 97f3fdadca
1 changed files with 13 additions and 14 deletions
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27
src/compiler/nir/nir_lower_io.c
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@@ -3156,6 +3156,15 @@ nir_lower_io_passes(nir_shader *nir, bool renumber_vs_inputs)
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);
/* 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 | nir_var_shader_out);
/* Lower and remove dead derefs and variables to clean up the IR. */
NIR_PASS_V(nir, nir_lower_vars_to_ssa);
NIR_PASS_V(nir, nir_opt_dce);
NIR_PASS_V(nir, nir_remove_dead_variables, nir_var_function_temp, NULL);
/* 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
@@ -3166,22 +3175,12 @@ nir_lower_io_passes(nir_shader *nir, bool renumber_vs_inputs)
* 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.
*
* This must be done after DCE to remove dead load_input intrinsics.
*/
NIR_PASS_V(nir, nir_recompute_io_bases,
(nir->info.stage != MESA_SHADER_VERTEX ||
renumber_vs_inputs
? nir_var_shader_in
: 0) |
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 | nir_var_shader_out);
/* Lower and remove dead derefs and variables to clean up the IR. */
NIR_PASS_V(nir, nir_lower_vars_to_ssa);
NIR_PASS_V(nir, nir_opt_dce);
NIR_PASS_V(nir, nir_remove_dead_variables, nir_var_function_temp, NULL);
(nir->info.stage != MESA_SHADER_VERTEX || renumber_vs_inputs ?
nir_var_shader_in : 0) | nir_var_shader_out);
if (nir->xfb_info)
NIR_PASS_V(nir, nir_io_add_intrinsic_xfb_info);