[PATCH vkd3d 03/17] vkd3d-shader/hlsl: Handle loops in copy propagation.

[Matteo Bruni]

From: Giovanni Mascellani

Signed-off-by: Matteo Bruni 
---
changelog: Continue copy propagation after encountering a LOOP, rework for
the copy_propagation_state change.

libs/vkd3d-shader/hlsl_codegen.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/libs/vkd3d-shader/hlsl_codegen.c b/libs/vkd3d-shader/hlsl_codegen.c
index cbe546c3..2ef51f78 100644
--- a/libs/vkd3d-shader/hlsl_codegen.c
+++ b/libs/vkd3d-shader/hlsl_codegen.c
@@ -513,6 +513,21 @@ static bool copy_propagation_process_if(struct hlsl_ctx *ctx, struct hlsl_ir_if
     return progress;
 }

+static bool copy_propagation_process_loop(struct hlsl_ctx *ctx, struct hlsl_ir_loop *loop,
+        struct copy_propagation_state *state)
+{
+    struct copy_propagation_state inner_state;
+    bool progress = false;
+
+    copy_propagation_invalidate_from_block(ctx, state, &loop->body);
+
+    copy_propagation_state_init(ctx, &inner_state, state);
+    progress |= copy_propagation_transform_block(ctx, &loop->body, &inner_state);
+    copy_propagation_state_destroy(&inner_state);
+
+    return progress;
+}
+
 static bool copy_propagation_transform_block(struct hlsl_ctx *ctx, struct hlsl_block *block,
         struct copy_propagation_state *state)
 {
@@ -536,8 +551,8 @@ static bool copy_propagation_transform_block(struct hlsl_ctx *ctx, struct hlsl_b
                 break;

case HLSL_IR_LOOP:
-                FIXME("Copy propagation doesn't support loops yet, leaving.\n");
-                return progress;
+                progress |= copy_propagation_process_loop(ctx, hlsl_ir_loop(instr), state);
+                break;

default:
                 break;