1 // Copyright 2016 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 // This file encapsulates some of the odd characteristics of the 6 // s390x instruction set, to minimize its interaction 7 // with the core of the assembler. 8 9 package arch 10 11 import ( 12 "cmd/internal/obj" 13 "cmd/internal/obj/s390x" 14 ) 15 16 func jumpS390x(word string) bool { 17 switch word { 18 case "BC", 19 "BCL", 20 "BEQ", 21 "BGE", 22 "BGT", 23 "BL", 24 "BLE", 25 "BLEU", 26 "BLT", 27 "BLTU", 28 "BNE", 29 "BR", 30 "BVC", 31 "BVS", 32 "CMPBEQ", 33 "CMPBGE", 34 "CMPBGT", 35 "CMPBLE", 36 "CMPBLT", 37 "CMPBNE", 38 "CMPUBEQ", 39 "CMPUBGE", 40 "CMPUBGT", 41 "CMPUBLE", 42 "CMPUBLT", 43 "CMPUBNE", 44 "CALL", 45 "JMP": 46 return true 47 } 48 return false 49 } 50 51 // IsS390xCMP reports whether the op (as defined by an s390x.A* constant) is 52 // one of the CMP instructions that require special handling. 53 func IsS390xCMP(op obj.As) bool { 54 switch op { 55 case s390x.ACMP, s390x.ACMPU, s390x.ACMPW, s390x.ACMPWU: 56 return true 57 } 58 return false 59 } 60 61 // IsS390xNEG reports whether the op (as defined by an s390x.A* constant) is 62 // one of the NEG-like instructions that require special handling. 63 func IsS390xNEG(op obj.As) bool { 64 switch op { 65 case s390x.ANEG, s390x.ANEGW: 66 return true 67 } 68 return false 69 } 70 71 func s390xRegisterNumber(name string, n int16) (int16, bool) { 72 switch name { 73 case "AR": 74 if 0 <= n && n <= 15 { 75 return s390x.REG_AR0 + n, true 76 } 77 case "F": 78 if 0 <= n && n <= 15 { 79 return s390x.REG_F0 + n, true 80 } 81 case "R": 82 if 0 <= n && n <= 15 { 83 return s390x.REG_R0 + n, true 84 } 85 case "V": 86 if 0 <= n && n <= 31 { 87 return s390x.REG_V0 + n, true 88 } 89 } 90 return 0, false 91 } 92
