nir: Rename lower_double_pack to lower_64bit_pack

There's nothing "double" about it other than, perhaps, the fact that it
packs two 32-bit values.

Reviewed-by: Kenneth Graunke <[email protected]>

1 files changed, 97 insertions, 0 deletions

diff --git a/src/compiler/nir/nir_lower_64bit_packing.c b/src/compiler/nir/nir_lower_64bit_packing.c
new file mode 100644
index 00000000000..f523cebf474
--- /dev/null
+++ b/src/compiler/nir/nir_lower_64bit_packing.c
@@ -0,0 +1,97 @@
+/*
+ * Copyright © 2015 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"
+
+/*
+ * lowers:
+ *
+ * packDouble2x32(foo) -> packDouble2x32Split(foo.x, foo.y)
+ * unpackDouble2x32(foo) -> vec2(unpackDouble2x32_x(foo), unpackDouble2x32_y(foo))
+ * packInt2x32(foo) -> packInt2x32Split(foo.x, foo.y)
+ * unpackInt2x32(foo) -> vec2(unpackInt2x32_x(foo), unpackInt2x32_y(foo))
+ */
+
+static nir_ssa_def *
+lower_pack_64(nir_builder *b, nir_ssa_def *src)
+{
+   return nir_pack_64_2x32_split(b, nir_channel(b, src, 0),
+                                    nir_channel(b, src, 1));
+}
+
+static nir_ssa_def *
+lower_unpack_64(nir_builder *b, nir_ssa_def *src)
+{
+   return nir_vec2(b, nir_unpack_64_2x32_split_x(b, src),
+                      nir_unpack_64_2x32_split_y(b, src));
+}
+
+static void
+lower_64bit_pack_impl(nir_function_impl *impl)
+{
+   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_alu)
+            continue;
+
+         nir_alu_instr *alu_instr = (nir_alu_instr *) instr;
+
+         if (alu_instr->op != nir_op_pack_64_2x32 &&
+             alu_instr->op != nir_op_unpack_64_2x32)
+            continue;
+
+         b.cursor = nir_before_instr(&alu_instr->instr);
+
+         nir_ssa_def *src = nir_ssa_for_alu_src(&b, alu_instr, 0);
+         nir_ssa_def *dest;
+
+         switch (alu_instr->op) {
+         case nir_op_pack_64_2x32:
+            dest = lower_pack_64(&b, src);
+            break;
+         case nir_op_unpack_64_2x32:
+            dest = lower_unpack_64(&b, src);
+            break;
+         default:
+            unreachable("Impossible opcode");
+         }
+
+         nir_ssa_def_rewrite_uses(&alu_instr->dest.dest.ssa, nir_src_for_ssa(dest));
+         nir_instr_remove(&alu_instr->instr);
+      }
+   }
+}
+
+void
+nir_lower_64bit_pack(nir_shader *shader)
+{
+   nir_foreach_function(function, shader) {
+      if (function->impl)
+         lower_64bit_pack_impl(function->impl);
+   }
+}