[PATCH vkd3d 3/5] vkd3d-shader: Add a dead code elimination pass.
Zebediah Figura
zfigura at codeweavers.com
Tue Mar 16 16:31:54 CDT 2021
Signed-off-by: Zebediah Figura <zfigura at codeweavers.com>
---
libs/vkd3d-shader/hlsl_codegen.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/libs/vkd3d-shader/hlsl_codegen.c b/libs/vkd3d-shader/hlsl_codegen.c
index c8d8d17f..22ad3ed0 100644
--- a/libs/vkd3d-shader/hlsl_codegen.c
+++ b/libs/vkd3d-shader/hlsl_codegen.c
@@ -120,6 +120,32 @@ static bool fold_constants(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, voi
return true;
}
+static bool dce(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, void *context)
+{
+ switch (instr->type)
+ {
+ case HLSL_IR_CONSTANT:
+ case HLSL_IR_EXPR:
+ case HLSL_IR_LOAD:
+ case HLSL_IR_SWIZZLE:
+ if (list_empty(&instr->uses))
+ {
+ list_remove(&instr->entry);
+ hlsl_free_instr(instr);
+ return true;
+ }
+ break;
+
+ case HLSL_IR_ASSIGNMENT:
+ case HLSL_IR_IF:
+ case HLSL_IR_JUMP:
+ case HLSL_IR_LOOP:
+ break;
+ }
+
+ return false;
+}
+
/* Allocate a unique, ordered index to each instruction, which will be used for
* computing liveness ranges. */
static unsigned int index_instructions(struct list *instrs, unsigned int index)
@@ -264,6 +290,7 @@ int hlsl_emit_dxbc(struct hlsl_ctx *ctx, struct hlsl_ir_function_decl *entry_fun
list_move_head(entry_func->body, &ctx->static_initializers);
while (transform_ir(ctx, fold_constants, entry_func->body, NULL));
+ while (transform_ir(ctx, dce, entry_func->body, NULL));
/* Index 0 means unused; index 1 means function entry, so start at 2. */
index_instructions(entry_func->body, 2);
--
2.30.1
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