> PR rtl-optimization/49145
> * combine.c (make_compound_operation): Handle ZERO_EXTEND specially.
>
> gcc/testsuite/
> PR rtl-optimization/49145
> From Ryan Mansfield
> * gcc.c-torture/compile/pr49145.c: New test.
OK, thanks.
--
Eric Botcazou
Eric Botcazou writes:
> SUBREG and ZERO_EXTEND of CONST_INTs are treated somewhat specially in the
> entire file, see for example do_SUBST. This isn't the case for other unary
> operators, presumably because this isn't really necessary here. So I'm not
> convinced that such a generalization i
> I've included the subreg handling as well as the zero_extend handling,
> even though make_compound_operation already handles that case correctly.
> However, I've cowardly not removed the known_cond subreg handling:
>
> else if (code == SUBREG)
> {
> enum machine_mode inner_mode = GET_
Three places in combine.c use SUBST to perform recursive replacements
on operands. Two of them (subst and known_cond) handle the special
case of a zero_extend operand being optimised to a constant. This patch
deals with the third, make_compound_operation.
In the PR, make_compound_operation is ab
