[Mesa-dev] [PATCH 12/12] i965/gen7+: Use NIR for lowering of pack/unpack opcodes.

[Matt Turner]

---
 src/mesa/drivers/dri/i965/brw_compiler.c           | 15 +++++++++++++
 .../dri/i965/brw_fs_channel_expressions.cpp        |  8 +++++++
 src/mesa/drivers/dri/i965/brw_link.cpp             | 25 ++++++----------------
 3 files changed, 29 insertions(+), 19 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_compiler.c b/src/mesa/drivers/dri/i965/brw_compiler.c
index 21fff1d..f9e22d1 100644
--- a/src/mesa/drivers/dri/i965/brw_compiler.c
+++ b/src/mesa/drivers/dri/i965/brw_compiler.c
@@ -87,7 +87,15 @@ shader_perf_log_mesa(void *data, const char *fmt, ...)
 static const struct nir_shader_compiler_options scalar_nir_options = {
    COMMON_OPTIONS,
    .lower_pack_half_2x16 = true,
+   .lower_pack_snorm_2x16 = true,
+   .lower_pack_snorm_4x8 = true,
+   .lower_pack_unorm_2x16 = true,
+   .lower_pack_unorm_4x8 = true,
    .lower_unpack_half_2x16 = true,
+   .lower_unpack_snorm_2x16 = true,
+   .lower_unpack_snorm_4x8 = true,
+   .lower_unpack_unorm_2x16 = true,
+   .lower_unpack_unorm_4x8 = true,
 };
 
 static const struct nir_shader_compiler_options vector_nir_options = {
@@ -98,6 +106,13 @@ static const struct nir_shader_compiler_options vector_nir_options = {
     * instructions because it can optimize better for us.
     */
    .fdot_replicates = true,
+
+   .lower_pack_snorm_2x16 = true,
+   .lower_pack_unorm_2x16 = true,
+   .lower_unpack_snorm_2x16 = true,
+   .lower_unpack_unorm_2x16 = true,
+   .lower_extract_byte = true,
+   .lower_extract_word = true,
 };
 
 struct brw_compiler *
diff --git a/src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp b/src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp
index b16dd2f..cbad47e 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_channel_expressions.cpp
@@ -73,6 +73,10 @@ channel_expressions_predicate(ir_instruction *ir)
 
    switch (expr->operation) {
       case ir_unop_pack_half_2x16:
+      case ir_unop_pack_snorm_2x16:
+      case ir_unop_pack_snorm_4x8:
+      case ir_unop_pack_unorm_2x16:
+      case ir_unop_pack_unorm_4x8:
          return false;
 
       /* these opcodes need to act on the whole vector,
@@ -166,6 +170,10 @@ ir_channel_expressions_visitor::visit_leave(ir_assignment *ir)
 
    switch (expr->operation) {
       case ir_unop_pack_half_2x16:
+      case ir_unop_pack_snorm_2x16:
+      case ir_unop_pack_snorm_4x8:
+      case ir_unop_pack_unorm_2x16:
+      case ir_unop_pack_unorm_4x8:
       case ir_unop_interpolate_at_centroid:
       case ir_binop_interpolate_at_offset:
       case ir_binop_interpolate_at_sample:
diff --git a/src/mesa/drivers/dri/i965/brw_link.cpp b/src/mesa/drivers/dri/i965/brw_link.cpp
index 8f2d760..ab9d792 100644
--- a/src/mesa/drivers/dri/i965/brw_link.cpp
+++ b/src/mesa/drivers/dri/i965/brw_link.cpp
@@ -73,26 +73,13 @@ brw_lower_packing_builtins(struct brw_context *brw,
                            gl_shader_stage shader_type,
                            exec_list *ir)
 {
-   const struct brw_compiler *compiler = brw->intelScreen->compiler;
-
-   int ops = LOWER_PACK_SNORM_2x16
-           | LOWER_UNPACK_SNORM_2x16
-           | LOWER_PACK_UNORM_2x16
-           | LOWER_UNPACK_UNORM_2x16;
-
-   if (compiler->scalar_stage[shader_type]) {
-      ops |= LOWER_UNPACK_UNORM_4x8
-           | LOWER_UNPACK_SNORM_4x8
-           | LOWER_PACK_UNORM_4x8
-           | LOWER_PACK_SNORM_4x8;
-   }
-
-   if (brw->gen < 7) {
-      ops |= LOWER_PACK_HALF_2x16
-          |  LOWER_UNPACK_HALF_2x16;
-   }
+   /* Gens < 7 don't have instructions to convert to or from half-precision,
+    * and Gens < 6 don't expose that functionality.
+    */
+   if (brw->gen != 6)
+      return;
 
-   lower_packing_builtins(ir, ops);
+   lower_packing_builtins(ir, LOWER_PACK_HALF_2x16 | LOWER_UNPACK_HALF_2x16);
 }
 
 static void
-- 
2.4.10