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tcg/optimize: Fold andc with immediate to and

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Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-11-15 11:18:55 -08:00
parent c3b920b3d6
commit 899281c8f5
1 changed files with 19 additions and 0 deletions
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19
tcg/optimize.c
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@ -1343,6 +1343,25 @@ static bool fold_andc(OptContext *ctx, TCGOp *op)
t2 = arg_info(op->args[2]);
z_mask = t1->z_mask;
if (ti_is_const(t2)) {
/* Fold andc r,x,i to and r,x,~i. */
switch (ctx->type) {
case TCG_TYPE_I32:
case TCG_TYPE_I64:
op->opc = INDEX_op_and;
break;
case TCG_TYPE_V64:
case TCG_TYPE_V128:
case TCG_TYPE_V256:
op->opc = INDEX_op_and_vec;
break;
default:
g_assert_not_reached();
}
op->args[2] = arg_new_constant(ctx, ~ti_const_val(t2));
return fold_and(ctx, op);
}
/*
* Known-zeros does not imply known-ones. Therefore unless
* arg2 is constant, we can't infer anything from it.