AVR: Add two RTL peepholes.

Register alloc may expand a 3-operand arithmetic X = Y o CST as
   X = CST
   X o= Y
where it may be better to instead:
   X = Y
   X o= CST
because 1) the first insn may use MOVW for "X = Y", and 2) the
operation may be more efficient when performed with a constant,
for example when ADIW or SBIW can be used, or some bytes of
the constant are 0x00 or 0xff.

gcc/
	* config/avr/avr.md: Add two RTL peepholes for PLUS, IOR and AND
	in HI, PSI, SI that swap operation order from "X = CST, X o= Y"
	to "X = Y, X o= CST".

0 files changed, 0 insertions, 0 deletions