re PR target/50358 (AVR: Implement [u]maddqihi4 [u]msubqihi4 patterns on the enhanced...

re PR target/50358 (AVR: Implement [u]maddqihi4 [u]msubqihi4 patterns on the enhanced core)

	PR target/50358
	* config/avr/avr.md (*ashiftqihi2.signx.1): New insn.
	(*maddqi4, *maddqi4.const): New insns.
	(*msubqi4, *msubqi4.const): New insns.
	* config/avr/avr.c (avr_rtx_costs): Record costs of above in cases
	PLUS:QI and MINUS:QI.  Increase costs of multiply-add/-sub for
	HImode by 1 in the case of multiplying with a CONST_INT.
	Record cost of *ashiftqihi2.signx.1 in case ASHIFT:QI.

From-SVN: r178912