Mesa (master): r600/sfn: Add lowering pass to convert load_interpolated to load for POS
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Fri Nov 27 10:42:38 UTC 2020
Module: Mesa
Branch: master
Commit: e9babb853d1d627175833050d42a381702510108
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=e9babb853d1d627175833050d42a381702510108
Author: Gert Wollny <gert.wollny at collabora.com>
Date: Sat Nov 21 16:20:01 2020 +0100
r600/sfn: Add lowering pass to convert load_interpolated to load for POS
the values are loaded directly from a register and the specification of
parycentrics is only in the way.
Signed-off-by: Gert Wollny <gert.wollny at collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7715>
---
src/gallium/drivers/r600/sfn/sfn_nir.cpp | 40 ++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)
diff --git a/src/gallium/drivers/r600/sfn/sfn_nir.cpp b/src/gallium/drivers/r600/sfn/sfn_nir.cpp
index 9cfd8b75600..f6c78748cfb 100644
--- a/src/gallium/drivers/r600/sfn/sfn_nir.cpp
+++ b/src/gallium/drivers/r600/sfn/sfn_nir.cpp
@@ -700,6 +700,46 @@ r600_lower_shared_io(nir_shader *nir)
return progress;
}
+
+static nir_ssa_def *
+r600_lower_fs_pos_input_impl(nir_builder *b, nir_instr *instr, void *_options)
+{
+ auto old_ir = nir_instr_as_intrinsic(instr);
+ auto load = nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_input);
+ nir_ssa_dest_init(&load->instr, &load->dest,
+ old_ir->dest.ssa.num_components, old_ir->dest.ssa.bit_size, NULL);
+ nir_intrinsic_set_io_semantics(load, nir_intrinsic_io_semantics(old_ir));
+
+ nir_intrinsic_set_base(load, nir_intrinsic_base(old_ir));
+ nir_intrinsic_set_component(load, nir_intrinsic_component(old_ir));
+ nir_intrinsic_set_dest_type(load, nir_type_float32);
+ load->num_components = old_ir->num_components;
+ load->src[0] = old_ir->src[1];
+ nir_builder_instr_insert(b, &load->instr);
+ return &load->dest.ssa;
+}
+
+bool r600_lower_fs_pos_input_filter(const nir_instr *instr, const void *_options)
+{
+ if (instr->type != nir_instr_type_intrinsic)
+ return false;
+
+ auto ir = nir_instr_as_intrinsic(instr);
+ if (ir->intrinsic != nir_intrinsic_load_interpolated_input)
+ return false;
+
+ return nir_intrinsic_io_semantics(ir).location == VARYING_SLOT_POS;
+}
+
+/* Strip the interpolator specification, it is not needed and irritates */
+bool r600_lower_fs_pos_input(nir_shader *shader)
+{
+ return nir_shader_lower_instructions(shader,
+ r600_lower_fs_pos_input_filter,
+ r600_lower_fs_pos_input_impl,
+ nullptr);
+};
+
static bool
optimize_once(nir_shader *shader, bool vectorize)
{
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