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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@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7715>
This commit is contained in:
Gert Wollny 2020-11-21 16:20:01 +01:00 committed by Marge Bot
parent c41d0d0c3d
commit e9babb853d
1 changed files with 40 additions and 0 deletions
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40
src/gallium/drivers/r600/sfn/sfn_nir.cpp
View File

@ -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)
{