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radv/nir_lower_viewport_to_zero: intrinsic pass

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Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Konstantin Seurer <konstantin.seurer@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/33655>
This commit is contained in:
Alyssa Rosenzweig 2025-02-20 14:35:16 -05:00 • committed by Marge Bot
parent 2504e7951b
commit c025a211f2
1 changed files with 16 additions and 35 deletions
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51
src/amd/vulkan/nir/radv_nir_lower_viewport_to_zero.c
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@ -10,42 +10,23 @@
#include "nir_builder.h"
#include "radv_nir.h"
static bool
pass(nir_builder *b, nir_intrinsic_instr *intr, void *_)
{
if (intr->intrinsic != nir_intrinsic_load_deref)
return false;
nir_variable *var = nir_intrinsic_get_var(intr, 0);
if (var->data.mode != nir_var_shader_in || var->data.location != VARYING_SLOT_VIEWPORT)
return false;
b->cursor = nir_before_instr(&intr->instr);
nir_def_replace(&intr->def, nir_imm_zero(b, 1, 32));
return true;
}
bool
radv_nir_lower_viewport_to_zero(nir_shader *nir)
{
nir_function_impl *impl = nir_shader_get_entrypoint(nir);
bool progress = false;
nir_builder b = nir_builder_create(impl);
/* There should be only one deref load for VIEWPORT after lower_io_to_temporaries. */
nir_foreach_block (block, impl) {
nir_foreach_instr (instr, block) {
if (instr->type != nir_instr_type_intrinsic)
continue;
nir_intrinsic_instr *intr = nir_instr_as_intrinsic(instr);
if (intr->intrinsic != nir_intrinsic_load_deref)
continue;
nir_variable *var = nir_intrinsic_get_var(intr, 0);
if (var->data.mode != nir_var_shader_in || var->data.location != VARYING_SLOT_VIEWPORT)
continue;
b.cursor = nir_before_instr(instr);
nir_def_rewrite_uses(&intr->def, nir_imm_zero(&b, 1, 32));
progress = true;
break;
}
if (progress)
break;
}
if (progress)
nir_metadata_preserve(impl, nir_metadata_control_flow);
else
nir_metadata_preserve(impl, nir_metadata_all);
return progress;
return nir_shader_intrinsics_pass(nir, pass, nir_metadata_control_flow, NULL);
}