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tcg/optimize: Fold eqv with immediate to xor

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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 11:51:28 -08:00
parent fffd3dc902
commit 46c68d7506
1 changed files with 23 additions and 2 deletions
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25
tcg/optimize.c
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@ -1807,6 +1807,7 @@ static bool fold_dup2(OptContext *ctx, TCGOp *op)
static bool fold_eqv(OptContext *ctx, TCGOp *op) static bool fold_eqv(OptContext *ctx, TCGOp *op)
{ {
uint64_t s_mask; uint64_t s_mask;
TempOptInfo *t1, *t2;
if (fold_const2_commutative(ctx, op) || if (fold_const2_commutative(ctx, op) ||
fold_xi_to_x(ctx, op, -1) || fold_xi_to_x(ctx, op, -1) ||
@ -1814,8 +1815,28 @@ static bool fold_eqv(OptContext *ctx, TCGOp *op)
return true; return true;
} }
s_mask = arg_info(op->args[1])->s_mask t2 = arg_info(op->args[2]);
& arg_info(op->args[2])->s_mask; if (ti_is_const(t2)) {
/* Fold eqv r,x,i to xor r,x,~i. */
switch (ctx->type) {
case TCG_TYPE_I32:
case TCG_TYPE_I64:
op->opc = INDEX_op_xor;
break;
case TCG_TYPE_V64:
case TCG_TYPE_V128:
case TCG_TYPE_V256:
op->opc = INDEX_op_xor_vec;
break;
default:
g_assert_not_reached();
}
op->args[2] = arg_new_constant(ctx, ~ti_const_val(t2));
return fold_xor(ctx, op);
}
t1 = arg_info(op->args[1]);
s_mask = t1->s_mask & t2->s_mask;
return fold_masks_s(ctx, op, s_mask); return fold_masks_s(ctx, op, s_mask);
} }