// using shifted ops this can be done in 4 instructions.
(Bswap32 <t> x) && buildcfg.GOARM.Version==5 =>
	(XOR <t>
		(SRLconst <t> (BICconst <t> (XOR <t> x (SRRconst <t> [16] x)) [0xff0000]) [8])
		(SRRconst <t> x [8]))

// byte swap for ARMv6 and above
(Bswap32 x) && buildcfg.GOARM.Version>=6 => (REV x)

// boolean ops -- booleans are represented with 0=false, 1=true
(AndB ...) => (AND ...)