// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// Prefer SARX/SHLX/SHRX instruction because it has less register restriction on the shift input.
(SAR(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SARX(Q|L) x y)
(SHL(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SHLX(Q|L) x y)
(SHR(Q|L) x y) && buildcfg.GOAMD64 >= 3 => (SHRX(Q|L) x y)

// See comments in ARM64latelower.rules for why these are here.
(MOVLQZX x) && zeroUpper32Bits(x,3) => x
(MOVWQZX x) && zeroUpper48Bits(x,3) => x
(MOVBQZX x) && zeroUpper56Bits(x,3) => x