[v4] tcg: optimize redundant sign extensions

[PATCH v4 44/51] tcg/optimize: Use fold_xi_to_x for mul

Posted by Richard Henderson 4 years, 3 months ago

Recognize the identity function for low-part multiply.

Suggested-by: Luis Pires <luis.pires@eldorado.org.br>
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 bea82305db..fe2b1eb18e 100644
--- a/tcg/optimize.c
+++ b/tcg/optimize.c
@@ -1460,7 +1460,8 @@ 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;
-- 
2.25.1

Re: [PATCH v4 44/51] tcg/optimize: Use fold_xi_to_x for mul

Posted by Philippe Mathieu-Daudé 4 years, 3 months ago

On 10/27/21 01:09, Richard Henderson wrote:
> Recognize the identity function for low-part multiply.
> 
> Suggested-by: Luis Pires <luis.pires@eldorado.org.br>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  tcg/optimize.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>

RE: [PATCH v4 44/51] tcg/optimize: Use fold_xi_to_x for mul

Posted by Luis Fernando Fujita Pires 4 years, 3 months ago

From: Richard Henderson <richard.henderson@linaro.org>
> Recognize the identity function for low-part multiply.
> 
> Suggested-by: Luis Pires <luis.pires@eldorado.org.br>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
> ---
>  tcg/optimize.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Reviewed-by: Luis Pires <luis.pires@eldorado.org.br>

--
Luis Pires
Instituto de Pesquisas ELDORADO
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