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nir: optimize gl_SampleMaskIn to gl_HelperInvocation for radeonsi when possible

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Acked-by: Timothy Arceri <tarceri@itsqueeze.com>
This commit is contained in:
Marek Olšák
2019-04-09 21:40:33 -04:00
parent d98f6380cb
commit d3ce8a7f6b
4 changed files with 48 additions and 2 deletions
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40
src/compiler/nir/nir_opt_intrinsics.c
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@@ -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);