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anv/pipeline: lower constant initializers on output variables earlier

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If a shader only writes to an output via a constant initializer we
need to lower it before we call nir_remove_dead_variables so that
this pass sees the stores from the initializer and doesn't kill the
output.

Fixes test failures in new work-in-progress CTS tests:
dEQP-VK.spirv_assembly.instruction.graphics.variable_init.output_vert
dEQP-VK.spirv_assembly.instruction.graphics.variable_init.output_frag

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
This commit is contained in:
Iago Toral Quiroga 2018-01-16 09:37:11 +01:00
parent 6316c2ecbd
commit 99b57daf4a
1 changed files with 5 additions and 0 deletions
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5
src/intel/vulkan/anv_pipeline.c
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@ -179,6 +179,11 @@ anv_shader_compile_to_nir(struct anv_pipeline *pipeline,
assert(exec_list_length(&nir->functions) == 1);
entry_point->name = ralloc_strdup(entry_point, "main");
/* Make sure we lower constant initializers on output variables so that
* nir_remove_dead_variables below sees the corresponding stores
*/
NIR_PASS_V(nir, nir_lower_constant_initializers, nir_var_shader_out);
NIR_PASS_V(nir, nir_remove_dead_variables,
nir_var_shader_in | nir_var_shader_out | nir_var_system_value);