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 package mips 6 7 import ( 8 "cmd/compile/internal/gc" 9 "cmd/internal/obj" 10 "cmd/internal/obj/mips" 11 ) 12 13 const ( 14 LeftRdwr uint32 = gc.LeftRead | gc.LeftWrite 15 RightRdwr uint32 = gc.RightRead | gc.RightWrite 16 ) 17 18 // This table gives the basic information about instruction 19 // generated by the compiler and processed in the optimizer. 20 // See opt.h for bit definitions. 21 // 22 // Instructions not generated need not be listed. 23 // As an exception to that rule, we typically write down all the 24 // size variants of an operation even if we just use a subset. 25 // 26 // The table is formatted for 8-space tabs. 27 var progtable = [mips.ALAST & obj.AMask]gc.ProgInfo{ 28 obj.ATYPE: {Flags: gc.Pseudo | gc.Skip}, 29 obj.ATEXT: {Flags: gc.Pseudo}, 30 obj.AFUNCDATA: {Flags: gc.Pseudo}, 31 obj.APCDATA: {Flags: gc.Pseudo}, 32 obj.AUNDEF: {Flags: gc.Break}, 33 obj.AUSEFIELD: {Flags: gc.OK}, 34 obj.AVARDEF: {Flags: gc.Pseudo | gc.RightWrite}, 35 obj.AVARKILL: {Flags: gc.Pseudo | gc.RightWrite}, 36 obj.AVARLIVE: {Flags: gc.Pseudo | gc.LeftRead}, 37 38 // NOP is an internal no-op that also stands 39 // for USED and SET annotations, not the MIPS opcode. 40 obj.ANOP: {Flags: gc.LeftRead | gc.RightWrite}, 41 42 // Integer 43 mips.AADD & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 44 mips.AADDU & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 45 mips.ASUB & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 46 mips.ASUBU & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 47 mips.AAND & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 48 mips.AOR & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 49 mips.AXOR & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 50 mips.ANOR & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 51 mips.AMUL & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead}, 52 mips.AMULU & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead}, 53 mips.ADIV & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead}, 54 mips.ADIVU & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead}, 55 mips.ASLL & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 56 mips.ASRA & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 57 mips.ASRL & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 58 mips.ASGT & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 59 mips.ASGTU & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | gc.RightWrite}, 60 61 mips.ACLZ & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RightRead}, 62 mips.ACLO & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RightRead}, 63 64 // Floating point. 65 mips.AADDF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RegRead | gc.RightWrite}, 66 mips.AADDD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RegRead | gc.RightWrite}, 67 mips.ASUBF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RegRead | gc.RightWrite}, 68 mips.ASUBD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RegRead | gc.RightWrite}, 69 mips.AMULF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RegRead | gc.RightWrite}, 70 mips.AMULD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RegRead | gc.RightWrite}, 71 mips.ADIVF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RegRead | gc.RightWrite}, 72 mips.ADIVD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RegRead | gc.RightWrite}, 73 mips.AABSF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RightWrite}, 74 mips.AABSD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RightWrite}, 75 mips.ANEGF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RightWrite}, 76 mips.ANEGD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RightWrite}, 77 mips.ACMPEQF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RegRead}, 78 mips.ACMPEQD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RegRead}, 79 mips.ACMPGTF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RegRead}, 80 mips.ACMPGTD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RegRead}, 81 mips.ACMPGEF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RegRead}, 82 mips.ACMPGED & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RegRead}, 83 mips.AMOVFD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RightWrite | gc.Conv}, 84 mips.AMOVDF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RightWrite | gc.Conv}, 85 mips.AMOVFW & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RightWrite | gc.Conv}, 86 mips.AMOVWF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RightWrite | gc.Conv}, 87 mips.AMOVDW & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RightWrite | gc.Conv}, 88 mips.AMOVWD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RightWrite | gc.Conv}, 89 mips.ATRUNCFW & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RightWrite | gc.Conv}, 90 mips.ATRUNCDW & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RightWrite | gc.Conv}, 91 92 mips.ASQRTF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RightWrite}, 93 mips.ASQRTD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RightWrite}, 94 95 // Moves 96 mips.AMOVB & obj.AMask: {Flags: gc.SizeB | gc.LeftRead | gc.RightWrite | gc.Move | gc.Conv}, 97 mips.AMOVBU & obj.AMask: {Flags: gc.SizeB | gc.LeftRead | gc.RightWrite | gc.Move | gc.Conv}, 98 mips.AMOVH & obj.AMask: {Flags: gc.SizeW | gc.LeftRead | gc.RightWrite | gc.Move | gc.Conv}, 99 mips.AMOVHU & obj.AMask: {Flags: gc.SizeW | gc.LeftRead | gc.RightWrite | gc.Move | gc.Conv}, 100 mips.AMOVW & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RightWrite | gc.Move | gc.Conv}, 101 mips.AMOVF & obj.AMask: {Flags: gc.SizeF | gc.LeftRead | gc.RightWrite | gc.Move | gc.Conv}, 102 mips.AMOVD & obj.AMask: {Flags: gc.SizeD | gc.LeftRead | gc.RightWrite | gc.Move | gc.Conv}, 103 104 // Conditional moves 105 mips.ACMOVN & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | RightRdwr}, 106 mips.ACMOVZ & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RegRead | RightRdwr}, 107 mips.ACMOVT & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | RightRdwr}, 108 mips.ACMOVF & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | RightRdwr}, 109 110 // Conditional trap 111 mips.ATEQ & obj.AMask: {Flags: gc.SizeL | gc.RegRead | gc.RightRead}, 112 mips.ATNE & obj.AMask: {Flags: gc.SizeL | gc.RegRead | gc.RightRead}, 113 114 // Atomic 115 mips.ASYNC & obj.AMask: {Flags: gc.OK}, 116 mips.ALL & obj.AMask: {Flags: gc.SizeL | gc.LeftRead | gc.RightWrite}, 117 mips.ASC & obj.AMask: {Flags: gc.SizeL | LeftRdwr | gc.RightRead}, 118 119 // Jumps 120 mips.AJMP & obj.AMask: {Flags: gc.Jump | gc.Break}, 121 mips.AJAL & obj.AMask: {Flags: gc.Call}, 122 mips.ABEQ & obj.AMask: {Flags: gc.Cjmp}, 123 mips.ABNE & obj.AMask: {Flags: gc.Cjmp}, 124 mips.ABGEZ & obj.AMask: {Flags: gc.Cjmp}, 125 mips.ABLTZ & obj.AMask: {Flags: gc.Cjmp}, 126 mips.ABGTZ & obj.AMask: {Flags: gc.Cjmp}, 127 mips.ABLEZ & obj.AMask: {Flags: gc.Cjmp}, 128 mips.ABFPF & obj.AMask: {Flags: gc.Cjmp}, 129 mips.ABFPT & obj.AMask: {Flags: gc.Cjmp}, 130 mips.ARET & obj.AMask: {Flags: gc.Break}, 131 obj.ADUFFZERO: {Flags: gc.Call}, 132 obj.ADUFFCOPY: {Flags: gc.Call}, 133 } 134 135 func proginfo(p *obj.Prog) gc.ProgInfo { 136 info := progtable[p.As&obj.AMask] 137 138 if info.Flags == 0 { 139 gc.Fatalf("proginfo: unknown instruction %v", p) 140 } 141 142 if (info.Flags&gc.RegRead != 0) && p.Reg == 0 { 143 info.Flags &^= gc.RegRead 144 info.Flags |= gc.RightRead 145 } 146 147 if p.From.Type == obj.TYPE_ADDR && p.From.Sym != nil && (info.Flags&gc.LeftRead != 0) { 148 info.Flags &^= gc.LeftRead 149 info.Flags |= gc.LeftAddr 150 } 151 152 if p.As == mips.AMUL && p.To.Reg != 0 { 153 info.Flags |= gc.RightWrite 154 } 155 156 return info 157 } 158
