// 32-bit
(MOVWstore [i] {s} p w1 x:(MOVWstore [i-4] {s} p w0 mem))
  && p.Op != OpSB
  && x.Uses == 1
  && is20Bit(int64(i)-4)
  && setPos(v, x.Pos)
  && clobber(x)
  => (STM2 [i-4] {s} p w0 w1 mem)
(MOVWstore [i] {s} p w2 x:(STM2 [i-8] {s} p w0 w1 mem))
  && x.Uses == 1
  && is20Bit(int64(i)-8)
  && setPos(v, x.Pos)
  && clobber(x)
  => (STM3 [i-8] {s} p w0 w1 w2 mem)

			asm:            "STMG",
			faultOnNilArg0: true,
			symEffect:      "Write",
			clobberFlags:   true, // TODO(mundaym): currently uses AGFI to handle large offsets
		},
		{
			name:           "STM2",
			argLength:      4,
			reg:            regInfo{inputs: []regMask{ptrsp, buildReg("R1"), buildReg("R2"), 0}},
			aux:            "SymOff",
			typ:            "Mem",
			asm:            "STMY",