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possible input transformations
adde $-1,X => addme X
adde $0,X => addze X
subw $s,X => addw $-s,X
orn $v,X => or $~v,X
qa:
subc r1,$s,r2 => subc $s,r1,r2
movw sreg(Rn),Rm => movw sreg(NREG),Rn,Rm [and v.v.]
others?
andn $m => and $~m
slw $sh,s,a => rliwnm
srw $sh,s,a => rliwnm
support for C_LCON needed since addresses are literals?
- moves
- branch distance
- could rewrite movwu x,d(r) as movw $d,tmp; movwu x,(tmp+d) when d is large?
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