[PATCH 03/15] tcg/optimize: Fold eqv with immediate to xor

[Richard Henderson]

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 5729433548..c6b0ab35c8 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1687,6 +1687,15 @@ static bool fold_eqv(OptContext *ctx, TCGOp *op)
         return true;
     }
 
+    /* Fold eqv r,x,i to xor r,x,~i. */
+    if (arg_is_const(op->args[2])) {
+        uint64_t val = ~arg_info(op->args[2])->val;
+
+        op->opc = (ctx->type == TCG_TYPE_I32
+                   ? INDEX_op_xor_i32 : INDEX_op_xor_i64);
+        op->args[2] = arg_new_constant(ctx, val);
+    }
+
     ctx->s_mask = arg_info(op->args[1])->s_mask
                 & arg_info(op->args[2])->s_mask;
     return false;
-- 
2.34.1