vkd3d-shader/hlsl: Lower int absolute value.

Signed-off-by: Giovanni Mascellani <gmascellani@codeweavers.com>

1 files changed, 30 insertions, 0 deletions

diff --git a/libs/vkd3d-shader/hlsl_codegen.c b/libs/vkd3d-shader/hlsl_codegen.c
index bb1602ca..f1c7eec5 100644
--- a/libs/vkd3d-shader/hlsl_codegen.c
+++ b/libs/vkd3d-shader/hlsl_codegen.c
@@ -1574,6 +1574,35 @@ static bool lower_casts_to_bool(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr
     return true;
 }
 
+static bool lower_int_abs(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, void *context)
+{
+    struct hlsl_type *type = instr->data_type;
+    struct hlsl_ir_node *arg, *neg;
+    struct hlsl_ir_expr *expr;
+
+    if (instr->type != HLSL_IR_EXPR)
+        return false;
+    expr = hlsl_ir_expr(instr);
+
+    if (expr->op != HLSL_OP1_ABS)
+        return false;
+    if (type->type != HLSL_CLASS_SCALAR && type->type != HLSL_CLASS_VECTOR)
+        return false;
+    if (type->base_type != HLSL_TYPE_INT)
+        return false;
+
+    arg = expr->operands[0].node;
+
+    if (!(neg = hlsl_new_unary_expr(ctx, HLSL_OP1_NEG, arg, instr->loc)))
+        return false;
+    list_add_before(&instr->entry, &neg->entry);
+
+    expr->op = HLSL_OP2_MAX;
+    hlsl_src_from_node(&expr->operands[1], neg);
+
+    return true;
+}
+
 static bool dce(struct hlsl_ctx *ctx, struct hlsl_ir_node *instr, void *context)
 {
     switch (instr->type)
@@ -2706,6 +2735,7 @@ int hlsl_emit_bytecode(struct hlsl_ctx *ctx, struct hlsl_ir_function_decl *entry
     transform_ir(ctx, split_matrix_copies, body, NULL);
     transform_ir(ctx, lower_narrowing_casts, body, NULL);
     transform_ir(ctx, lower_casts_to_bool, body, NULL);
+    transform_ir(ctx, lower_int_abs, body, NULL);
     do
     {
         progress = transform_ir(ctx, hlsl_fold_constant_exprs, body, NULL);