[PATCH v3 7/7] vkd3d-shader/hlsl: Propagate swizzle chains in copy propagation.

[Francisco Casas]

From: Francisco Casas

---
 libs/vkd3d-shader/hlsl_codegen.c        | 22 ++++++++++++++++++++++
 tests/swizzle-constant-prop.shader_test |  6 +++---
 2 files changed, 25 insertions(+), 3 deletions(-)

diff --git a/libs/vkd3d-shader/hlsl_codegen.c b/libs/vkd3d-shader/hlsl_codegen.c
index 6763558a..8aaf9b71 100644
--- a/libs/vkd3d-shader/hlsl_codegen.c
+++ b/libs/vkd3d-shader/hlsl_codegen.c
@@ -886,6 +886,8 @@ static bool copy_propagation_transform_swizzle(struct hlsl_ctx *ctx,
     struct hlsl_ir_swizzle *swizzle, struct copy_propagation_state *state)
 {
     struct hlsl_ir_node *instr = &swizzle->node, *new_instr;
+    struct hlsl_ir_node *next_val = swizzle->val.node;
+    unsigned int combined_swizzle = swizzle->swizzle;

if ((new_instr = copy_propagation_compute_swizzle_constant_replacement(ctx, state, swizzle)))
     {
@@ -893,6 +895,26 @@ static bool copy_propagation_transform_swizzle(struct hlsl_ctx *ctx,
         hlsl_replace_node(instr, new_instr);
         return true;
     }
+
+    while (next_val->type == HLSL_IR_SWIZZLE)
+    {
+        combined_swizzle = hlsl_combine_swizzles(hlsl_ir_swizzle(next_val)->swizzle,
+                combined_swizzle, instr->data_type->dimx);
+        next_val = hlsl_ir_swizzle(next_val)->val.node;
+    }
+    if (next_val != swizzle->val.node)
+    {
+        struct hlsl_ir_swizzle *new_swizzle;
+
+        if (!(new_swizzle = hlsl_new_swizzle(ctx, combined_swizzle, instr->data_type->dimx, next_val, &instr->loc)))
+            return false;
+
+        new_instr = &new_swizzle->node;
+        list_add_before(&instr->entry, &new_instr->entry);
+        hlsl_replace_node(instr, new_instr);
+        return true;
+    }
+
     return false;
 }

diff --git a/tests/swizzle-constant-prop.shader_test b/tests/swizzle-constant-prop.shader_test
index 86eb3f19..468a66b6 100644
--- a/tests/swizzle-constant-prop.shader_test
+++ b/tests/swizzle-constant-prop.shader_test
@@ -26,7 +26,7 @@ draw quad
 probe all rgba (110, 210, 410, 410)

-[pixel shader todo]
+[pixel shader]
 Texture2D tex;
 uniform int i;

@@ -41,5 +41,5 @@ float4 main() : sv_target

[test]
 uniform 0 int 3
-todo draw quad
-todo probe all rgba (105, 5, 305, 305)
+draw quad
+probe all rgba (105, 5, 305, 305)