[PATCH vkd3d 5/5] vkd3d-shader: Lower DIV to RCP + MUL for SM1.
Zebediah Figura
zfigura at codeweavers.com
Fri May 21 00:32:24 CDT 2021
Signed-off-by: Zebediah Figura <zfigura at codeweavers.com>
---
libs/vkd3d-shader/hlsl_codegen.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/libs/vkd3d-shader/hlsl_codegen.c b/libs/vkd3d-shader/hlsl_codegen.c
index b4ea8396..afa096b0 100644
--- a/libs/vkd3d-shader/hlsl_codegen.c
+++ b/libs/vkd3d-shader/hlsl_codegen.c
@@ -388,6 +388,27 @@ static bool fold_constants(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, voi
return true;
}
+/* Lower DIV to RCP + MUL. */
+static bool lower_division(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, void *context)
+{
+ struct hlsl_ir_expr *expr;
+ struct hlsl_ir_node *rcp;
+
+ if (instr->type != HLSL_IR_EXPR)
+ return false;
+ expr = hlsl_ir_expr(instr);
+ if (expr->op != HLSL_IR_BINOP_DIV)
+ return false;
+
+ if (!(rcp = hlsl_new_unary_expr(ctx, HLSL_IR_UNOP_RCP, expr->operands[1].node, instr->loc)))
+ return false;
+ list_add_before(&expr->node.entry, &rcp->entry);
+ expr->op = HLSL_IR_BINOP_MUL;
+ hlsl_src_remove(&expr->operands[1]);
+ hlsl_src_from_node(&expr->operands[1], rcp);
+ return true;
+}
+
static bool dce(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, void *context)
{
switch (instr->type)
@@ -1954,6 +1975,9 @@ int hlsl_emit_dxbc(struct hlsl_ctx *ctx, struct hlsl_ir_function_decl *entry_fun
while (transform_ir(ctx, split_struct_copies, entry_func->body, NULL));
while (transform_ir(ctx, fold_constants, entry_func->body, NULL));
+ if (ctx->profile->major_version < 4)
+ transform_ir(ctx, lower_division, entry_func->body, NULL);
+
do
compute_liveness(ctx, entry_func);
while (transform_ir(ctx, dce, entry_func->body, NULL));
--
2.31.1
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