--- /dev/null
+/*
+ * Copyright © 2020 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include "nir.h"
+#include "nir_builder.h"
+#include "nir_conversion_builder.h"
+
+static bool
+try_simplify_convert_intrin(nir_intrinsic_instr *conv)
+{
+ bool progress = false;
+
+ nir_alu_type src_type = nir_intrinsic_src_type(conv);
+ nir_alu_type dest_type = nir_intrinsic_dest_type(conv);
+
+ nir_rounding_mode rounding = nir_intrinsic_rounding_mode(conv);
+ nir_rounding_mode simple_rounding =
+ nir_simplify_conversion_rounding(src_type, dest_type, rounding);
+ if (rounding != simple_rounding) {
+ nir_intrinsic_set_rounding_mode(conv, simple_rounding);
+ progress = true;
+ }
+
+ if (nir_intrinsic_saturate(conv) &&
+ nir_alu_type_range_contains_type_range(dest_type, src_type)) {
+ nir_intrinsic_set_saturate(conv, false);
+ progress = true;
+ }
+
+ return progress;
+}
+
+static void
+lower_convert_alu_types_instr(nir_builder *b, nir_intrinsic_instr *conv)
+{
+ assert(conv->intrinsic == nir_intrinsic_convert_alu_types);
+ assert(conv->src[0].is_ssa && conv->dest.is_ssa);
+
+ b->cursor = nir_instr_remove(&conv->instr);
+ nir_ssa_def *val =
+ nir_convert_with_rounding(b, conv->src[0].ssa,
+ nir_intrinsic_src_type(conv),
+ nir_intrinsic_dest_type(conv),
+ nir_intrinsic_rounding_mode(conv),
+ nir_intrinsic_saturate(conv));
+ nir_ssa_def_rewrite_uses(&conv->dest.ssa, nir_src_for_ssa(val));
+}
+
+static bool
+opt_simplify_convert_alu_types_impl(nir_function_impl *impl)
+{
+ bool progress = false;
+ bool lowered_instr = false;
+
+ nir_builder b;
+ nir_builder_init(&b, impl);
+
+ nir_foreach_block(block, impl) {
+ nir_foreach_instr_safe(instr, block) {
+ if (instr->type != nir_instr_type_intrinsic)
+ continue;
+
+ nir_intrinsic_instr *conv = nir_instr_as_intrinsic(instr);
+ if (conv->intrinsic != nir_intrinsic_convert_alu_types)
+ continue;
+
+ if (try_simplify_convert_intrin(conv))
+ progress = true;
+
+ if (nir_intrinsic_rounding_mode(conv) == nir_rounding_mode_undef &&
+ !nir_intrinsic_saturate(conv)) {
+ lower_convert_alu_types_instr(&b, conv);
+ lowered_instr = true;
+ }
+ }
+ }
+
+ if (lowered_instr) {
+ nir_metadata_preserve(impl, nir_metadata_block_index |
+ nir_metadata_dominance);
+ } else {
+ nir_metadata_preserve(impl, nir_metadata_all);
+ }
+
+ return progress;
+}
+
+bool
+nir_opt_simplify_convert_alu_types(nir_shader *shader)
+{
+ bool progress = false;
+
+ nir_foreach_function(func, shader) {
+ if (func->impl && opt_simplify_convert_alu_types_impl(func->impl))
+ progress = true;
+ }
+
+ return progress;
+}
+
+static bool
+lower_convert_alu_types_impl(nir_function_impl *impl,
+ bool (*should_lower)(nir_intrinsic_instr *))
+{
+ bool progress = false;
+
+ nir_builder b;
+ nir_builder_init(&b, impl);
+
+ nir_foreach_block(block, impl) {
+ nir_foreach_instr_safe(instr, block) {
+ if (instr->type != nir_instr_type_intrinsic)
+ continue;
+
+ nir_intrinsic_instr *conv = nir_instr_as_intrinsic(instr);
+ if (conv->intrinsic != nir_intrinsic_convert_alu_types)
+ continue;
+
+ if (should_lower != NULL && !should_lower(conv))
+ continue;
+
+ lower_convert_alu_types_instr(&b, conv);
+ progress = true;
+ }
+ }
+
+ if (progress) {
+ nir_metadata_preserve(impl, nir_metadata_block_index |
+ nir_metadata_dominance);
+ } else {
+ nir_metadata_preserve(impl, nir_metadata_all);
+ }
+
+ return progress;
+}
+
+bool
+nir_lower_convert_alu_types(nir_shader *shader,
+ bool (*should_lower)(nir_intrinsic_instr *))
+{
+ bool progress = false;
+
+ nir_foreach_function(func, shader) {
+ if (func->impl && lower_convert_alu_types_impl(func->impl, should_lower))
+ progress = true;
+ }
+
+ return progress;
+}
+
+static bool
+is_constant(nir_intrinsic_instr *conv)
+{
+ assert(conv->intrinsic == nir_intrinsic_convert_alu_types);
+ return nir_src_is_const(conv->src[0]);
+}
+
+bool
+nir_lower_constant_convert_alu_types(nir_shader *shader)
+{
+ return nir_lower_convert_alu_types(shader, is_constant);
+}