v_2 := v.Args[2]
	v_1 := v.Args[1]
	v_0 := v.Args[0]
	b := v.Block
	typ := &b.Func.Config.Types
	// match: (AtomicAnd8 ptr val mem)
	// result: (LoweredAtomicAnd32 (ANDI <typ.Uintptr> [^3] ptr) (NOT <typ.UInt32> (SLL <typ.UInt32> (XORI <typ.UInt32> [0xff] (ZeroExt8to32 val)) (SLLI <typ.UInt64> [3] (ANDI <typ.UInt64> [3] ptr)))) mem)
	for {
		ptr := v_0
		val := v_1
		mem := v_2
		v.reset(OpRISCV64LoweredAtomicAnd32)

// can do the shift directly.
// left shift
(Lsh(64|32|16|8)x64 <t> x y) && shiftIsBounded(v) => (SLL <t> x y)
(Lsh(64|32|16|8)x32 <t> x y) && shiftIsBounded(v) => (SLL <t> x y)
(Lsh(64|32|16|8)x16 <t> x y) && shiftIsBounded(v) => (SLL <t> x y)
(Lsh(64|32|16|8)x8  <t> x y) && shiftIsBounded(v) => (SLL <t> x y)

// signed right shift
(Rsh64x(64|32|16|8) <t> x y) && shiftIsBounded(v) => (SRA <t> x y)

	// match: (AtomicAnd8 ptr val mem)
	// cond: !config.BigEndian
	// result: (LoweredAtomicAnd (AND <typ.UInt32Ptr> (MOVWconst [^3]) ptr) (OR <typ.UInt32> (SLL <typ.UInt32> (ZeroExt8to32 val) (SLLconst <typ.UInt32> [3] (ANDconst <typ.UInt32> [3] ptr))) (NORconst [0] <typ.UInt32> (SLL <typ.UInt32> (MOVWconst [0xff]) (SLLconst <typ.UInt32> [3] (ANDconst <typ.UInt32> [3] ptr))))) mem)
	for {
		ptr := v_0
		val := v_1
		mem := v_2