On 03/24/2011 07:38 AM, Eric Botcazou wrote:
> + /* Deal with the special case 0 > x: only one comparison is necessary and
> + we reverse it to avoid jumping to the drop-through label. */
> + if (op0 == const0_rtx && drop_through_if_true && !drop_through_if_false)
> +{
> + code = LE
Hi,
this improves the RTL generated for multi-word comparison to avoid generating
useless branches. In do_jump_by_parts_greater_rtx:
1) do not generate the last cond jump,
2) do not generate the uncond branch to the drop-through label, if any,
3) generate only one comparison for the specia
