expand: Allow widdening optab when expanding popcount==1 [PR116508]

After adding popcount{qi,hi}2 to the aarch64 backend, I noticed that
the expansion for popcount==1 was no longer trying to do the trick
of handling popcount==1 as `(arg ^ (arg - 1)) > arg - 1`. The problem
is the expansion was using OPTAB_DIRECT, when using OPTAB_WIDEN
will allow modes which are smaller than SImode (in the aarch64 case).

Note QImode's cost still needs some improvements so part of popcnt-eq-1.c
is xfailed. Though there is a check to make sure the costs are compared now.

Built and tested on aarch64-linux-gnu.

	PR middle-end/116508

gcc/ChangeLog:

	* internal-fn.cc (expand_POPCOUNT): Use OPTAB_WIDEN for PLUS and
	XOR/AND expansion.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/popcnt-eq-1.c: New test.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>

0 files changed, 0 insertions, 0 deletions