1// Copyright 2022 The Go Authors. All rights reserved. 2// Use of this source code is governed by a BSD-style 3// license that can be found in the LICENSE file. 4 5// Fold constant shift with extension. 6(SRAI [c] (MOVBreg x)) && c < 8 => (SRAI [56+c] (SLLI <typ.Int64> [56] x)) 7(SRAI [c] (MOVHreg x)) && c < 16 => (SRAI [48+c] (SLLI <typ.Int64> [48] x)) 8(SRAI [c] (MOVWreg x)) && c < 32 => (SRAI [32+c] (SLLI <typ.Int64> [32] x)) 9(SRLI [c] (MOVBUreg x)) && c < 8 => (SRLI [56+c] (SLLI <typ.UInt64> [56] x)) 10(SRLI [c] (MOVHUreg x)) && c < 16 => (SRLI [48+c] (SLLI <typ.UInt64> [48] x)) 11(SRLI [c] (MOVWUreg x)) && c < 32 => (SRLI [32+c] (SLLI <typ.UInt64> [32] x)) 12(SLLI [c] (MOVBUreg x)) && c <= 56 => (SRLI [56-c] (SLLI <typ.UInt64> [56] x)) 13(SLLI [c] (MOVHUreg x)) && c <= 48 => (SRLI [48-c] (SLLI <typ.UInt64> [48] x)) 14(SLLI [c] (MOVWUreg x)) && c <= 32 => (SRLI [32-c] (SLLI <typ.UInt64> [32] x)) 15 16// Shift by zero. 17(SRAI [0] x) => x 18(SRLI [0] x) => x 19(SLLI [0] x) => x 20