diff options
Diffstat (limited to 'src/mesa/drivers')
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_fs.cpp | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp index 3aaf843bc9..fc91bbcfa4 100644 --- a/src/mesa/drivers/dri/i965/brw_fs.cpp +++ b/src/mesa/drivers/dri/i965/brw_fs.cpp @@ -6403,6 +6403,69 @@ computed_depth_mode(const nir_shader *shader) } /** + * Move load_interpolated_input with simple (payload-based) barycentric modes + * to the top of the program so we don't emit multiple PLNs for the same input. + * + * This works around CSE not being able to handle non-dominating cases + * such as: + * + * if (...) { + * interpolate input + * } else { + * interpolate the same exact input + * } + * + * This should be replaced by global value numbering someday. + */ +void +move_interpolation_to_top(nir_shader *nir) +{ + nir_foreach_function(f, nir) { + if (!f->impl) + continue; + + nir_block *top = nir_start_block(f->impl); + + nir_foreach_block(block, f->impl) { + if (block == top) + continue; + + nir_foreach_instr_reverse_safe(instr, block) { + if (instr->type != nir_instr_type_intrinsic) + continue; + + nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr); + switch (intrin->intrinsic) { + case nir_intrinsic_load_barycentric_pixel: + case nir_intrinsic_load_barycentric_centroid: + case nir_intrinsic_load_barycentric_sample: + break; + case nir_intrinsic_load_interpolated_input: { + nir_intrinsic_instr *bary_intrinsic = + nir_instr_as_intrinsic(intrin->src[0].ssa->parent_instr); + nir_intrinsic_op op = bary_intrinsic->intrinsic; + + /* Leave interpolateAtSample/Offset() where it is. */ + if (op == nir_intrinsic_load_barycentric_at_sample || + op == nir_intrinsic_load_barycentric_at_offset) + continue; + } + default: + continue; + } + + exec_node_remove(&instr->node); + exec_list_push_head(&top->instr_list, &instr->node); + instr->block = top; + } + } + nir_metadata_preserve(f->impl, (nir_metadata) + ((unsigned) nir_metadata_block_index | + (unsigned) nir_metadata_dominance)); + } +} + +/** * Apply default interpolation settings to FS inputs which don't specify any. */ static void @@ -6509,6 +6572,7 @@ brw_compile_fs(const struct brw_compiler *compiler, void *log_data, brw_nir_lower_fs_outputs(shader); if (!key->multisample_fbo) NIR_PASS_V(shader, demote_sample_qualifiers); + NIR_PASS_V(shader, move_interpolation_to_top); shader = brw_postprocess_nir(shader, compiler->devinfo, true); /* key->alpha_test_func means simulating alpha testing via discards, |