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tcg/optimize: Use fold_xi_to_x for mul 

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>
This commit is contained in:
Richard Henderson 2021-10-25 11:19:14 -07:00
parent 4e858d96aa
commit 5b5cf47983
1 changed files with 2 additions and 1 deletions
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tcg/optimize.c
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@ -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;