(C(R|GR)J  {c} x (MOVDconst [y]) yes no) && is8Bit(y)  => (C(I|GI)J  {c} x [ int8(y)] yes no)
(CL(R|GR)J {c} x (MOVDconst [y]) yes no) && isU8Bit(y) => (CL(I|GI)J {c} x [uint8(y)] yes no)
(C(R|GR)J  {c} (MOVDconst [x]) y yes no) && is8Bit(x)  => (C(I|GI)J  {c.ReverseComparison()} y [ int8(x)] yes no)
(CL(R|GR)J {c} (MOVDconst [x]) y yes no) && isU8Bit(x) => (CL(I|GI)J {c.ReverseComparison()} y [uint8(x)] yes no)

		}
	case BlockS390XCLGRJ:
		// match: (CLGRJ {c} x (MOVDconst [y]) yes no)
		// cond: isU8Bit(y)
		// result: (CLGIJ {c} x [uint8(y)] yes no)
		for b.Controls[1].Op == OpS390XMOVDconst {
			x := b.Controls[0]
			v_1 := b.Controls[1]
			y := auxIntToInt64(v_1.AuxInt)
			c := auxToS390xCCMask(b.Aux)
			if !(isU8Bit(y)) {
				break
			}
			b.resetWithControl(BlockS390XCLGIJ, x)

func is16Bit(n int64) bool {
	return n == int64(int16(n))
}

// is8Bit reports whether n can be represented as a signed 8 bit integer.
func is8Bit(n int64) bool {
	return n == int64(int8(n))
}

// isU8Bit reports whether n can be represented as an unsigned 8 bit integer.
func isU8Bit(n int64) bool {
	return n == int64(uint8(n))
}