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[PULL,v2,50/60] tcg/optimize: Use fold_xi_to_x for mul

Message ID 20211029043329.1518029-51-richard.henderson@linaro.org
State Accepted
Commit 5b5cf47983c37d4c49eb2b8449bc62a7d3d76dbc
Headers show
Series tcg patch queue | expand

Commit Message

Richard Henderson Oct. 29, 2021, 4:33 a.m. UTC 
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(-)

-- 
2.25.1
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Patch

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;