We canonicalize subtract with constant to add with constant.
Fix this missed instance.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 0b84d97051..f0aeb10d07 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -2289,7 +2289,7 @@ static int fold_setcond_zmask(OptContext *ctx, TCGOp *op, bool neg)
 
 static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
 {
-    TCGOpcode sub_opc, xor_opc, neg_opc, shr_opc;
+    TCGOpcode xor_opc, neg_opc, shr_opc;
     TCGOpcode uext_opc = 0, sext_opc = 0;
     TCGCond cond = op->args[3];
     TCGArg ret, src1, src2;
@@ -2311,7 +2311,6 @@ static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
 
     switch (ctx->type) {
     case TCG_TYPE_I32:
-        sub_opc = INDEX_op_sub_i32;
         xor_opc = INDEX_op_xor_i32;
         shr_opc = INDEX_op_shr_i32;
         neg_opc = INDEX_op_neg_i32;
@@ -2323,7 +2322,6 @@ static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
         }
         break;
     case TCG_TYPE_I64:
-        sub_opc = INDEX_op_sub_i64;
         xor_opc = INDEX_op_xor_i64;
         shr_opc = INDEX_op_shr_i64;
         neg_opc = INDEX_op_neg_i64;
@@ -2367,10 +2365,10 @@ static void fold_setcond_tst_pow2(OptContext *ctx, TCGOp *op, bool neg)
     }
 
     if (neg && inv) {
-        op2 = tcg_op_insert_after(ctx->tcg, op, sub_opc, 3);
+        op2 = tcg_op_insert_after(ctx->tcg, op, INDEX_op_add, 3);
         op2->args[0] = ret;
         op2->args[1] = ret;
-        op2->args[2] = arg_new_constant(ctx, 1);
+        op2->args[2] = arg_new_constant(ctx, -1);
     } else if (inv) {
         op2 = tcg_op_insert_after(ctx->tcg, op, xor_opc, 3);
         op2->args[0] = ret;
-- 
2.43.0