Duplicate fold_sub_vec into fold_sub instead of calling it,
now that fold_sub_vec always returns true.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/tcg/optimize.c b/tcg/optimize.c
index e53e6b6969..14d3d6253d 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -2603,12 +2603,15 @@ static bool fold_sub_vec(OptContext *ctx, TCGOp *op)
         fold_sub_to_neg(ctx, op)) {
         return true;
     }
-    return false;
+    return finish_folding(ctx, op);
 }
 
 static bool fold_sub(OptContext *ctx, TCGOp *op)
 {
-    if (fold_const2(ctx, op) || fold_sub_vec(ctx, op)) {
+    if (fold_const2(ctx, op) ||
+        fold_xx_to_i(ctx, op, 0) ||
+        fold_xi_to_x(ctx, op, 0) ||
+        fold_sub_to_neg(ctx, op)) {
         return true;
     }
 
@@ -2620,7 +2623,7 @@ static bool fold_sub(OptContext *ctx, TCGOp *op)
                    ? INDEX_op_add_i32 : INDEX_op_add_i64);
         op->args[2] = arg_new_constant(ctx, -val);
     }
-    return false;
+    return finish_folding(ctx, op);
 }
 
 static bool fold_sub2(OptContext *ctx, TCGOp *op)
-- 
2.43.0