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radv: 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.float

This is ported from anv:
99b57daf4a anv/pipeline: lower constant initializers on output variables earlier
from Iago Toral Quiroga <itoral@igalia.com>

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
This commit is contained in:
Dave Airlie 2018-03-19 04:27:49 +00:00
parent 032014ac01
commit e8d9b7ab02
1 changed files with 5 additions and 0 deletions
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5
src/amd/vulkan/radv_shader.c
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@ -244,6 +244,11 @@ radv_shader_compile_to_nir(struct radv_device *device,
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);