From d3ce8a7f6b93e893929b81f4d6605a2a968730a1 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Marek=20Ol=C5=A1=C3=A1k?= Date: Tue, 9 Apr 2019 21:40:33 -0400 Subject: [PATCH] nir: optimize gl_SampleMaskIn to gl_HelperInvocation for radeonsi when possible Acked-by: Timothy Arceri --- src/compiler/nir/nir.h | 8 +++++ src/compiler/nir/nir_opt_intrinsics.c | 40 +++++++++++++++++++++-- src/gallium/drivers/radeonsi/si_get.c | 1 + src/mesa/state_tracker/st_glsl_to_nir.cpp | 1 + 4 files changed, 48 insertions(+), 2 deletions(-) diff --git a/src/compiler/nir/nir.h b/src/compiler/nir/nir.h index 11f9b396e56..8cdc4ba5707 100644 --- a/src/compiler/nir/nir.h +++ b/src/compiler/nir/nir.h @@ -2307,6 +2307,14 @@ typedef struct nir_shader_compiler_options { */ bool lower_helper_invocation; + /** + * Convert gl_SampleMaskIn to gl_HelperInvocation as follows: + * + * gl_SampleMaskIn == 0 ---> gl_HelperInvocation + * gl_SampleMaskIn != 0 ---> !gl_HelperInvocation + */ + bool optimize_sample_mask_in; + bool lower_cs_local_index_from_id; bool lower_cs_local_id_from_index; diff --git a/src/compiler/nir/nir_opt_intrinsics.c b/src/compiler/nir/nir_opt_intrinsics.c index 7b054faa204..e185602bf9e 100644 --- a/src/compiler/nir/nir_opt_intrinsics.c +++ b/src/compiler/nir/nir_opt_intrinsics.c @@ -29,7 +29,8 @@ */ static bool -opt_intrinsics_impl(nir_function_impl *impl) +opt_intrinsics_impl(nir_function_impl *impl, + const struct nir_shader_compiler_options *options) { nir_builder b; nir_builder_init(&b, impl); @@ -55,6 +56,41 @@ opt_intrinsics_impl(nir_function_impl *impl) if (nir_src_is_const(intrin->src[0])) replacement = nir_imm_true(&b); break; + case nir_intrinsic_load_sample_mask_in: + /* Transform: + * gl_SampleMaskIn == 0 ---> gl_HelperInvocation + * gl_SampleMaskIn != 0 ---> !gl_HelperInvocation + */ + if (!options->optimize_sample_mask_in) + continue; + + nir_foreach_use_safe(use_src, &intrin->dest.ssa) { + if (use_src->parent_instr->type == nir_instr_type_alu) { + nir_alu_instr *alu = nir_instr_as_alu(use_src->parent_instr); + + if (alu->op == nir_op_ieq || + alu->op == nir_op_ine) { + /* Check for 0 in either operand. */ + nir_const_value *const_val = + nir_src_as_const_value(alu->src[0].src); + if (!const_val) + const_val = nir_src_as_const_value(alu->src[1].src); + if (!const_val || const_val->i32 != 0) + continue; + + nir_ssa_def *new_expr = nir_load_helper_invocation(&b, 1); + + if (alu->op == nir_op_ine) + new_expr = nir_inot(&b, new_expr); + + nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa, + nir_src_for_ssa(new_expr)); + nir_instr_remove(&alu->instr); + continue; + } + } + } + continue; default: break; } @@ -81,7 +117,7 @@ nir_opt_intrinsics(nir_shader *shader) if (!function->impl) continue; - if (opt_intrinsics_impl(function->impl)) { + if (opt_intrinsics_impl(function->impl, shader->options)) { progress = true; nir_metadata_preserve(function->impl, nir_metadata_block_index | nir_metadata_dominance); diff --git a/src/gallium/drivers/radeonsi/si_get.c b/src/gallium/drivers/radeonsi/si_get.c index 9e92dd40e7b..67fbc50998b 100644 --- a/src/gallium/drivers/radeonsi/si_get.c +++ b/src/gallium/drivers/radeonsi/si_get.c @@ -502,6 +502,7 @@ static const struct nir_shader_compiler_options nir_options = { .lower_unpack_unorm_4x8 = true, .lower_extract_byte = true, .lower_extract_word = true, + .optimize_sample_mask_in = true, .max_unroll_iterations = 32, .native_integers = true, }; diff --git a/src/mesa/state_tracker/st_glsl_to_nir.cpp b/src/mesa/state_tracker/st_glsl_to_nir.cpp index 21fba1c2998..97b2831b880 100644 --- a/src/mesa/state_tracker/st_glsl_to_nir.cpp +++ b/src/mesa/state_tracker/st_glsl_to_nir.cpp @@ -506,6 +506,7 @@ st_glsl_to_nir_post_opts(struct st_context *st, struct gl_program *prog, NIR_PASS_V(nir, st_nir_lower_builtin); NIR_PASS_V(nir, gl_nir_lower_atomics, shader_program, true); + NIR_PASS_V(nir, nir_opt_intrinsics); nir_variable_mode mask = nir_var_function_temp; nir_remove_dead_variables(nir, mask); -- 2.30.2