// 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.

// This file contains rules used by the laterLower pass.

// Simplify ISEL x $0 z into ISELZ
(ISEL [a] x (MOVDconst [0]) z) => (ISELZ [a] x z)
// Simplify ISEL $0 y z into ISELZ by inverting comparison and reversing arguments.
(ISEL [a] (MOVDconst [0]) y z) => (ISELZ [a^0x4] y z)

// SETBC, SETBCR is supported on ISA 3.1(Power10) and newer, use ISELZ for
// older targets
(SETBC [2] cmp) && buildcfg.GOPPC64 <= 9 => (ISELZ [2] (MOVDconst [1]) cmp)
(SETBCR [2] cmp) && buildcfg.GOPPC64 <= 9 => (ISELZ [6] (MOVDconst [1]) cmp)
(SETBC [0] cmp) && buildcfg.GOPPC64 <= 9 => (ISELZ [0] (MOVDconst [1]) cmp)
(SETBCR [0] cmp) && buildcfg.GOPPC64 <= 9 => (ISELZ [4] (MOVDconst [1]) cmp)
(SETBC [1] cmp) && buildcfg.GOPPC64 <= 9 => (ISELZ [1] (MOVDconst [1]) cmp)
(SETBCR [1] cmp) && buildcfg.GOPPC64 <= 9 => (ISELZ [5] (MOVDconst [1]) cmp)

// Avoid using ANDCCconst if the value for CR0 is not needed, since ANDCCconst
// always sets it.
(Select0 z:(ANDCCconst [m] x)) && z.Uses == 1 && isPPC64ValidShiftMask(m) => (RLDICL [encodePPC64RotateMask(0,m,64)] x)
// The upper bits of the smaller than register values is undefined. Take advantage of that.
(AND <t> x:(MOVDconst [m]) n) && t.Size() <= 2 => (Select0 (ANDCCconst [int64(int16(m))] n))

// Convert simple bit masks to an equivalent rldic[lr] if possible.
(AND x:(MOVDconst [m]) n) && isPPC64ValidShiftMask(m) => (RLDICL [encodePPC64RotateMask(0,m,64)] n)
(AND x:(MOVDconst [m]) n) && m != 0 && isPPC64ValidShiftMask(^m) => (RLDICR [encodePPC64RotateMask(0,m,64)] n)

// If the RLDICL does not rotate its value, a shifted value can be merged.
(RLDICL [em] x:(SRDconst [s] a)) && (em&0xFF0000) == 0 => (RLDICL [mergePPC64RLDICLandSRDconst(em, s)] a)

// Convert rotated 32 bit masks on 32 bit values into rlwinm. In general, this leaves the upper 32 bits in an undefined state.
(AND <t> x:(MOVDconst [m]) n) && t.Size() == 4 && isPPC64WordRotateMask(m) => (RLWINM [encodePPC64RotateMask(0,m,32)] n)

// When PCRel is supported, paddi can add a 34b signed constant in one instruction.
(ADD (MOVDconst [m]) x) && supportsPPC64PCRel() && (m<<30)>>30 == m => (ADDconst [m] x)