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radv: enable lower to scalar nir pass 

This will allow dead components of varyings to be removed.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
Timothy Arceri 2017-10-18 13:46:44 +11:00
parent 8ebaf8192a
commit 767ca5bdf1
1 changed files with 24 additions and 0 deletions
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24
src/amd/vulkan/radv_pipeline.c
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@ -1756,6 +1756,17 @@ void radv_create_shaders(struct radv_pipeline *pipeline,
modules[MESA_SHADER_FRAGMENT] = &fs_m;
}
/* Determine first and last stage. */
unsigned first = MESA_SHADER_STAGES;
unsigned last = 0;
for (unsigned i = 0; i < MESA_SHADER_STAGES; i++) {
if (!pStages[i])
continue;
if (first == MESA_SHADER_STAGES)
first = i;
last = i;
}
for (unsigned i = 0; i < MESA_SHADER_STAGES; ++i) {
const VkPipelineShaderStageCreateInfo *stage = pStages[i];
@ -1766,6 +1777,7 @@ void radv_create_shaders(struct radv_pipeline *pipeline,
stage ? stage->pName : "main", i,
stage ? stage->pSpecializationInfo : NULL);
pipeline->active_stages |= mesa_to_vk_shader_stage(i);
/* We don't want to alter meta shaders IR directly so clone it
* first.
*/
@ -1773,6 +1785,18 @@ void radv_create_shaders(struct radv_pipeline *pipeline,
nir[i] = nir_shader_clone(NULL, nir[i]);
}
if (first != last) {
nir_variable_mode mask = 0;
if (i != first)
mask = mask | nir_var_shader_in;
if (i != last)
mask = mask | nir_var_shader_out;
nir_lower_io_to_scalar_early(nir[i], mask);
radv_optimize_nir(nir[i]);
}
}
if (nir[MESA_SHADER_TESS_CTRL]) {