From 5b5cf47983c37d4c49eb2b8449bc62a7d3d76dbc Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Mon, 25 Oct 2021 11:19:14 -0700
Subject: [PATCH] tcg/optimize: Use fold_xi_to_x for mul
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Recognize the identity function for low-part multiply.

Suggested-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 tcg/optimize.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/tcg/optimize.c b/tcg/optimize.c
index 6d795954f2..907049fb06 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1461,7 +1461,8 @@ static bool fold_movcond(OptContext *ctx, TCGOp *op)
 static bool fold_mul(OptContext *ctx, TCGOp *op)
 {
     if (fold_const2(ctx, op) ||
-        fold_xi_to_i(ctx, op, 0)) {
+        fold_xi_to_i(ctx, op, 0) ||
+        fold_xi_to_x(ctx, op, 1)) {
         return true;
     }
     return false;