| // Copyright 2016 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. |
| |
| package x86 |
| |
| import ( |
| "fmt" |
| "math" |
| |
| "cmd/compile/internal/gc" |
| "cmd/compile/internal/ssa" |
| "cmd/internal/obj" |
| "cmd/internal/obj/x86" |
| ) |
| |
| // Smallest possible faulting page at address zero. |
| const minZeroPage = 4096 |
| |
| // ssaRegToReg maps ssa register numbers to obj register numbers. |
| var ssaRegToReg = []int16{ |
| x86.REG_AX, |
| x86.REG_CX, |
| x86.REG_DX, |
| x86.REG_BX, |
| x86.REG_SP, |
| x86.REG_BP, |
| x86.REG_SI, |
| x86.REG_DI, |
| x86.REG_X0, |
| x86.REG_X1, |
| x86.REG_X2, |
| x86.REG_X3, |
| x86.REG_X4, |
| x86.REG_X5, |
| x86.REG_X6, |
| x86.REG_X7, |
| 0, // SB isn't a real register. We fill an Addr.Reg field with 0 in this case. |
| } |
| |
| // markMoves marks any MOVXconst ops that need to avoid clobbering flags. |
| func ssaMarkMoves(s *gc.SSAGenState, b *ssa.Block) { |
| flive := b.FlagsLiveAtEnd |
| if b.Control != nil && b.Control.Type.IsFlags() { |
| flive = true |
| } |
| for i := len(b.Values) - 1; i >= 0; i-- { |
| v := b.Values[i] |
| if flive && v.Op == ssa.Op386MOVLconst { |
| // The "mark" is any non-nil Aux value. |
| v.Aux = v |
| } |
| if v.Type.IsFlags() { |
| flive = false |
| } |
| for _, a := range v.Args { |
| if a.Type.IsFlags() { |
| flive = true |
| } |
| } |
| } |
| } |
| |
| // loadByType returns the load instruction of the given type. |
| func loadByType(t ssa.Type) obj.As { |
| // Avoid partial register write |
| if !t.IsFloat() && t.Size() <= 2 { |
| if t.Size() == 1 { |
| return x86.AMOVBLZX |
| } else { |
| return x86.AMOVWLZX |
| } |
| } |
| // Otherwise, there's no difference between load and store opcodes. |
| return storeByType(t) |
| } |
| |
| // storeByType returns the store instruction of the given type. |
| func storeByType(t ssa.Type) obj.As { |
| width := t.Size() |
| if t.IsFloat() { |
| switch width { |
| case 4: |
| return x86.AMOVSS |
| case 8: |
| return x86.AMOVSD |
| } |
| } else { |
| switch width { |
| case 1: |
| return x86.AMOVB |
| case 2: |
| return x86.AMOVW |
| case 4: |
| return x86.AMOVL |
| } |
| } |
| panic("bad store type") |
| } |
| |
| // moveByType returns the reg->reg move instruction of the given type. |
| func moveByType(t ssa.Type) obj.As { |
| if t.IsFloat() { |
| switch t.Size() { |
| case 4: |
| return x86.AMOVSS |
| case 8: |
| return x86.AMOVSD |
| default: |
| panic(fmt.Sprintf("bad float register width %d:%s", t.Size(), t)) |
| } |
| } else { |
| switch t.Size() { |
| case 1: |
| // Avoids partial register write |
| return x86.AMOVL |
| case 2: |
| return x86.AMOVL |
| case 4: |
| return x86.AMOVL |
| default: |
| panic(fmt.Sprintf("bad int register width %d:%s", t.Size(), t)) |
| } |
| } |
| } |
| |
| // opregreg emits instructions for |
| // dest := dest(To) op src(From) |
| // and also returns the created obj.Prog so it |
| // may be further adjusted (offset, scale, etc). |
| func opregreg(op obj.As, dest, src int16) *obj.Prog { |
| p := gc.Prog(op) |
| p.From.Type = obj.TYPE_REG |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = dest |
| p.From.Reg = src |
| return p |
| } |
| |
| func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) { |
| s.SetLineno(v.Line) |
| |
| if gc.Thearch.Use387 { |
| if ssaGenValue387(s, v) { |
| return // v was handled by 387 generation. |
| } |
| } |
| |
| switch v.Op { |
| case ssa.Op386ADDL: |
| r := gc.SSARegNum(v) |
| r1 := gc.SSARegNum(v.Args[0]) |
| r2 := gc.SSARegNum(v.Args[1]) |
| switch { |
| case r == r1: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = r2 |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| case r == r2: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = r1 |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| default: |
| p := gc.Prog(x86.ALEAL) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = r1 |
| p.From.Scale = 1 |
| p.From.Index = r2 |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| } |
| |
| // 2-address opcode arithmetic |
| case ssa.Op386SUBL, |
| ssa.Op386MULL, |
| ssa.Op386ANDL, |
| ssa.Op386ORL, |
| ssa.Op386XORL, |
| ssa.Op386SHLL, |
| ssa.Op386SHRL, ssa.Op386SHRW, ssa.Op386SHRB, |
| ssa.Op386SARL, ssa.Op386SARW, ssa.Op386SARB, |
| ssa.Op386ADDSS, ssa.Op386ADDSD, ssa.Op386SUBSS, ssa.Op386SUBSD, |
| ssa.Op386MULSS, ssa.Op386MULSD, ssa.Op386DIVSS, ssa.Op386DIVSD, |
| ssa.Op386PXOR, |
| ssa.Op386ADCL, |
| ssa.Op386SBBL: |
| r := gc.SSARegNum(v) |
| if r != gc.SSARegNum(v.Args[0]) { |
| v.Fatalf("input[0] and output not in same register %s", v.LongString()) |
| } |
| opregreg(v.Op.Asm(), r, gc.SSARegNum(v.Args[1])) |
| |
| case ssa.Op386ADDLcarry, ssa.Op386SUBLcarry: |
| // output 0 is carry/borrow, output 1 is the low 32 bits. |
| r := gc.SSARegNum1(v) |
| if r != gc.SSARegNum(v.Args[0]) { |
| v.Fatalf("input[0] and output[1] not in same register %s", v.LongString()) |
| } |
| opregreg(v.Op.Asm(), r, gc.SSARegNum(v.Args[1])) |
| |
| case ssa.Op386ADDLconstcarry, ssa.Op386SUBLconstcarry: |
| // output 0 is carry/borrow, output 1 is the low 32 bits. |
| r := gc.SSARegNum1(v) |
| if r != gc.SSARegNum(v.Args[0]) { |
| v.Fatalf("input[0] and output[1] not in same register %s", v.LongString()) |
| } |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = v.AuxInt |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| |
| case ssa.Op386DIVL, ssa.Op386DIVW, |
| ssa.Op386DIVLU, ssa.Op386DIVWU, |
| ssa.Op386MODL, ssa.Op386MODW, |
| ssa.Op386MODLU, ssa.Op386MODWU: |
| |
| // Arg[0] is already in AX as it's the only register we allow |
| // and AX is the only output |
| x := gc.SSARegNum(v.Args[1]) |
| |
| // CPU faults upon signed overflow, which occurs when most |
| // negative int is divided by -1. |
| var j *obj.Prog |
| if v.Op == ssa.Op386DIVL || v.Op == ssa.Op386DIVW || |
| v.Op == ssa.Op386MODL || v.Op == ssa.Op386MODW { |
| |
| var c *obj.Prog |
| switch v.Op { |
| case ssa.Op386DIVL, ssa.Op386MODL: |
| c = gc.Prog(x86.ACMPL) |
| j = gc.Prog(x86.AJEQ) |
| gc.Prog(x86.ACDQ) //TODO: fix |
| |
| case ssa.Op386DIVW, ssa.Op386MODW: |
| c = gc.Prog(x86.ACMPW) |
| j = gc.Prog(x86.AJEQ) |
| gc.Prog(x86.ACWD) |
| } |
| c.From.Type = obj.TYPE_REG |
| c.From.Reg = x |
| c.To.Type = obj.TYPE_CONST |
| c.To.Offset = -1 |
| |
| j.To.Type = obj.TYPE_BRANCH |
| } |
| |
| // for unsigned ints, we sign extend by setting DX = 0 |
| // signed ints were sign extended above |
| if v.Op == ssa.Op386DIVLU || v.Op == ssa.Op386MODLU || |
| v.Op == ssa.Op386DIVWU || v.Op == ssa.Op386MODWU { |
| c := gc.Prog(x86.AXORL) |
| c.From.Type = obj.TYPE_REG |
| c.From.Reg = x86.REG_DX |
| c.To.Type = obj.TYPE_REG |
| c.To.Reg = x86.REG_DX |
| } |
| |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = x |
| |
| // signed division, rest of the check for -1 case |
| if j != nil { |
| j2 := gc.Prog(obj.AJMP) |
| j2.To.Type = obj.TYPE_BRANCH |
| |
| var n *obj.Prog |
| if v.Op == ssa.Op386DIVL || v.Op == ssa.Op386DIVW { |
| // n * -1 = -n |
| n = gc.Prog(x86.ANEGL) |
| n.To.Type = obj.TYPE_REG |
| n.To.Reg = x86.REG_AX |
| } else { |
| // n % -1 == 0 |
| n = gc.Prog(x86.AXORL) |
| n.From.Type = obj.TYPE_REG |
| n.From.Reg = x86.REG_DX |
| n.To.Type = obj.TYPE_REG |
| n.To.Reg = x86.REG_DX |
| } |
| |
| j.To.Val = n |
| j2.To.Val = s.Pc() |
| } |
| |
| case ssa.Op386HMULL, ssa.Op386HMULW, ssa.Op386HMULB, |
| ssa.Op386HMULLU, ssa.Op386HMULWU, ssa.Op386HMULBU: |
| // the frontend rewrites constant division by 8/16/32 bit integers into |
| // HMUL by a constant |
| // SSA rewrites generate the 64 bit versions |
| |
| // Arg[0] is already in AX as it's the only register we allow |
| // and DX is the only output we care about (the high bits) |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[1]) |
| |
| // IMULB puts the high portion in AH instead of DL, |
| // so move it to DL for consistency |
| if v.Type.Size() == 1 { |
| m := gc.Prog(x86.AMOVB) |
| m.From.Type = obj.TYPE_REG |
| m.From.Reg = x86.REG_AH |
| m.To.Type = obj.TYPE_REG |
| m.To.Reg = x86.REG_DX |
| } |
| |
| case ssa.Op386MULLQU: |
| // AX * args[1], high 32 bits in DX (result[0]), low 32 bits in AX (result[1]). |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[1]) |
| |
| case ssa.Op386ADDLconst: |
| r := gc.SSARegNum(v) |
| a := gc.SSARegNum(v.Args[0]) |
| if r == a { |
| if v.AuxInt == 1 { |
| p := gc.Prog(x86.AINCL) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| return |
| } |
| if v.AuxInt == -1 { |
| p := gc.Prog(x86.ADECL) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| return |
| } |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = v.AuxInt |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| return |
| } |
| p := gc.Prog(x86.ALEAL) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = a |
| p.From.Offset = v.AuxInt |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| |
| case ssa.Op386MULLconst: |
| r := gc.SSARegNum(v) |
| if r != gc.SSARegNum(v.Args[0]) { |
| v.Fatalf("input[0] and output not in same register %s", v.LongString()) |
| } |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = v.AuxInt |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| // TODO: Teach doasm to compile the three-address multiply imul $c, r1, r2 |
| // then we don't need to use resultInArg0 for these ops. |
| //p.From3 = new(obj.Addr) |
| //p.From3.Type = obj.TYPE_REG |
| //p.From3.Reg = gc.SSARegNum(v.Args[0]) |
| |
| case ssa.Op386SUBLconst, |
| ssa.Op386ADCLconst, |
| ssa.Op386SBBLconst, |
| ssa.Op386ANDLconst, |
| ssa.Op386ORLconst, |
| ssa.Op386XORLconst, |
| ssa.Op386SHLLconst, |
| ssa.Op386SHRLconst, ssa.Op386SHRWconst, ssa.Op386SHRBconst, |
| ssa.Op386SARLconst, ssa.Op386SARWconst, ssa.Op386SARBconst, |
| ssa.Op386ROLLconst, ssa.Op386ROLWconst, ssa.Op386ROLBconst: |
| r := gc.SSARegNum(v) |
| if r != gc.SSARegNum(v.Args[0]) { |
| v.Fatalf("input[0] and output not in same register %s", v.LongString()) |
| } |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = v.AuxInt |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| case ssa.Op386SBBLcarrymask: |
| r := gc.SSARegNum(v) |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = r |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| case ssa.Op386LEAL1, ssa.Op386LEAL2, ssa.Op386LEAL4, ssa.Op386LEAL8: |
| r := gc.SSARegNum(v.Args[0]) |
| i := gc.SSARegNum(v.Args[1]) |
| p := gc.Prog(x86.ALEAL) |
| switch v.Op { |
| case ssa.Op386LEAL1: |
| p.From.Scale = 1 |
| if i == x86.REG_SP { |
| r, i = i, r |
| } |
| case ssa.Op386LEAL2: |
| p.From.Scale = 2 |
| case ssa.Op386LEAL4: |
| p.From.Scale = 4 |
| case ssa.Op386LEAL8: |
| p.From.Scale = 8 |
| } |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = r |
| p.From.Index = i |
| gc.AddAux(&p.From, v) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.Op386LEAL: |
| p := gc.Prog(x86.ALEAL) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| gc.AddAux(&p.From, v) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.Op386CMPL, ssa.Op386CMPW, ssa.Op386CMPB, |
| ssa.Op386TESTL, ssa.Op386TESTW, ssa.Op386TESTB: |
| opregreg(v.Op.Asm(), gc.SSARegNum(v.Args[1]), gc.SSARegNum(v.Args[0])) |
| case ssa.Op386UCOMISS, ssa.Op386UCOMISD: |
| // Go assembler has swapped operands for UCOMISx relative to CMP, |
| // must account for that right here. |
| opregreg(v.Op.Asm(), gc.SSARegNum(v.Args[0]), gc.SSARegNum(v.Args[1])) |
| case ssa.Op386CMPLconst, ssa.Op386CMPWconst, ssa.Op386CMPBconst: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| p.To.Type = obj.TYPE_CONST |
| p.To.Offset = v.AuxInt |
| case ssa.Op386TESTLconst, ssa.Op386TESTWconst, ssa.Op386TESTBconst: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = v.AuxInt |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| case ssa.Op386MOVLconst: |
| x := gc.SSARegNum(v) |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = v.AuxInt |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = x |
| // If flags are live at this instruction, suppress the |
| // MOV $0,AX -> XOR AX,AX optimization. |
| if v.Aux != nil { |
| p.Mark |= x86.PRESERVEFLAGS |
| } |
| case ssa.Op386MOVSSconst, ssa.Op386MOVSDconst: |
| x := gc.SSARegNum(v) |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_FCONST |
| p.From.Val = math.Float64frombits(uint64(v.AuxInt)) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = x |
| case ssa.Op386MOVSSconst1, ssa.Op386MOVSDconst1: |
| var literal string |
| if v.Op == ssa.Op386MOVSDconst1 { |
| literal = fmt.Sprintf("$f64.%016x", uint64(v.AuxInt)) |
| } else { |
| literal = fmt.Sprintf("$f32.%08x", math.Float32bits(float32(math.Float64frombits(uint64(v.AuxInt))))) |
| } |
| p := gc.Prog(x86.ALEAL) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Name = obj.NAME_EXTERN |
| p.From.Sym = obj.Linklookup(gc.Ctxt, literal, 0) |
| p.From.Sym.Local = true |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.Op386MOVSSconst2, ssa.Op386MOVSDconst2: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| |
| case ssa.Op386MOVSSload, ssa.Op386MOVSDload, ssa.Op386MOVLload, ssa.Op386MOVWload, ssa.Op386MOVBload, ssa.Op386MOVBLSXload, ssa.Op386MOVWLSXload: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| gc.AddAux(&p.From, v) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.Op386MOVSDloadidx8: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| gc.AddAux(&p.From, v) |
| p.From.Scale = 8 |
| p.From.Index = gc.SSARegNum(v.Args[1]) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.Op386MOVLloadidx4, ssa.Op386MOVSSloadidx4: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| gc.AddAux(&p.From, v) |
| p.From.Scale = 4 |
| p.From.Index = gc.SSARegNum(v.Args[1]) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.Op386MOVWloadidx2: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| gc.AddAux(&p.From, v) |
| p.From.Scale = 2 |
| p.From.Index = gc.SSARegNum(v.Args[1]) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.Op386MOVBloadidx1, ssa.Op386MOVWloadidx1, ssa.Op386MOVLloadidx1, ssa.Op386MOVSSloadidx1, ssa.Op386MOVSDloadidx1: |
| r := gc.SSARegNum(v.Args[0]) |
| i := gc.SSARegNum(v.Args[1]) |
| if i == x86.REG_SP { |
| r, i = i, r |
| } |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = r |
| p.From.Scale = 1 |
| p.From.Index = i |
| gc.AddAux(&p.From, v) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.Op386MOVSSstore, ssa.Op386MOVSDstore, ssa.Op386MOVLstore, ssa.Op386MOVWstore, ssa.Op386MOVBstore: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[1]) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| gc.AddAux(&p.To, v) |
| case ssa.Op386MOVSDstoreidx8: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[2]) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| p.To.Scale = 8 |
| p.To.Index = gc.SSARegNum(v.Args[1]) |
| gc.AddAux(&p.To, v) |
| case ssa.Op386MOVSSstoreidx4, ssa.Op386MOVLstoreidx4: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[2]) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| p.To.Scale = 4 |
| p.To.Index = gc.SSARegNum(v.Args[1]) |
| gc.AddAux(&p.To, v) |
| case ssa.Op386MOVWstoreidx2: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[2]) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| p.To.Scale = 2 |
| p.To.Index = gc.SSARegNum(v.Args[1]) |
| gc.AddAux(&p.To, v) |
| case ssa.Op386MOVBstoreidx1, ssa.Op386MOVWstoreidx1, ssa.Op386MOVLstoreidx1, ssa.Op386MOVSSstoreidx1, ssa.Op386MOVSDstoreidx1: |
| r := gc.SSARegNum(v.Args[0]) |
| i := gc.SSARegNum(v.Args[1]) |
| if i == x86.REG_SP { |
| r, i = i, r |
| } |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[2]) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Reg = r |
| p.To.Scale = 1 |
| p.To.Index = i |
| gc.AddAux(&p.To, v) |
| case ssa.Op386MOVLstoreconst, ssa.Op386MOVWstoreconst, ssa.Op386MOVBstoreconst: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_CONST |
| sc := v.AuxValAndOff() |
| p.From.Offset = sc.Val() |
| p.To.Type = obj.TYPE_MEM |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| gc.AddAux2(&p.To, v, sc.Off()) |
| case ssa.Op386MOVLstoreconstidx1, ssa.Op386MOVLstoreconstidx4, ssa.Op386MOVWstoreconstidx1, ssa.Op386MOVWstoreconstidx2, ssa.Op386MOVBstoreconstidx1: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_CONST |
| sc := v.AuxValAndOff() |
| p.From.Offset = sc.Val() |
| r := gc.SSARegNum(v.Args[0]) |
| i := gc.SSARegNum(v.Args[1]) |
| switch v.Op { |
| case ssa.Op386MOVBstoreconstidx1, ssa.Op386MOVWstoreconstidx1, ssa.Op386MOVLstoreconstidx1: |
| p.To.Scale = 1 |
| if i == x86.REG_SP { |
| r, i = i, r |
| } |
| case ssa.Op386MOVWstoreconstidx2: |
| p.To.Scale = 2 |
| case ssa.Op386MOVLstoreconstidx4: |
| p.To.Scale = 4 |
| } |
| p.To.Type = obj.TYPE_MEM |
| p.To.Reg = r |
| p.To.Index = i |
| gc.AddAux2(&p.To, v, sc.Off()) |
| case ssa.Op386MOVWLSX, ssa.Op386MOVBLSX, ssa.Op386MOVWLZX, ssa.Op386MOVBLZX, |
| ssa.Op386CVTSL2SS, ssa.Op386CVTSL2SD, |
| ssa.Op386CVTTSS2SL, ssa.Op386CVTTSD2SL, |
| ssa.Op386CVTSS2SD, ssa.Op386CVTSD2SS: |
| opregreg(v.Op.Asm(), gc.SSARegNum(v), gc.SSARegNum(v.Args[0])) |
| case ssa.Op386DUFFZERO: |
| p := gc.Prog(obj.ADUFFZERO) |
| p.To.Type = obj.TYPE_ADDR |
| p.To.Sym = gc.Linksym(gc.Pkglookup("duffzero", gc.Runtimepkg)) |
| p.To.Offset = v.AuxInt |
| case ssa.Op386DUFFCOPY: |
| p := gc.Prog(obj.ADUFFCOPY) |
| p.To.Type = obj.TYPE_ADDR |
| p.To.Sym = gc.Linksym(gc.Pkglookup("duffcopy", gc.Runtimepkg)) |
| p.To.Offset = v.AuxInt |
| |
| case ssa.OpCopy, ssa.Op386MOVLconvert: // TODO: use MOVLreg for reg->reg copies instead of OpCopy? |
| if v.Type.IsMemory() { |
| return |
| } |
| x := gc.SSARegNum(v.Args[0]) |
| y := gc.SSARegNum(v) |
| if x != y { |
| opregreg(moveByType(v.Type), y, x) |
| } |
| case ssa.OpLoadReg: |
| if v.Type.IsFlags() { |
| v.Unimplementedf("load flags not implemented: %v", v.LongString()) |
| return |
| } |
| p := gc.Prog(loadByType(v.Type)) |
| n, off := gc.AutoVar(v.Args[0]) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Node = n |
| p.From.Sym = gc.Linksym(n.Sym) |
| p.From.Offset = off |
| if n.Class == gc.PPARAM || n.Class == gc.PPARAMOUT { |
| p.From.Name = obj.NAME_PARAM |
| p.From.Offset += n.Xoffset |
| } else { |
| p.From.Name = obj.NAME_AUTO |
| } |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| |
| case ssa.OpStoreReg: |
| if v.Type.IsFlags() { |
| v.Unimplementedf("store flags not implemented: %v", v.LongString()) |
| return |
| } |
| p := gc.Prog(storeByType(v.Type)) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| n, off := gc.AutoVar(v) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Node = n |
| p.To.Sym = gc.Linksym(n.Sym) |
| p.To.Offset = off |
| if n.Class == gc.PPARAM || n.Class == gc.PPARAMOUT { |
| p.To.Name = obj.NAME_PARAM |
| p.To.Offset += n.Xoffset |
| } else { |
| p.To.Name = obj.NAME_AUTO |
| } |
| case ssa.OpPhi: |
| gc.CheckLoweredPhi(v) |
| case ssa.OpInitMem: |
| // memory arg needs no code |
| case ssa.OpArg: |
| // input args need no code |
| case ssa.Op386LoweredGetClosurePtr: |
| // Closure pointer is DX. |
| gc.CheckLoweredGetClosurePtr(v) |
| case ssa.Op386LoweredGetG: |
| r := gc.SSARegNum(v) |
| // See the comments in cmd/internal/obj/x86/obj6.go |
| // near CanUse1InsnTLS for a detailed explanation of these instructions. |
| if x86.CanUse1InsnTLS(gc.Ctxt) { |
| // MOVL (TLS), r |
| p := gc.Prog(x86.AMOVL) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Reg = x86.REG_TLS |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| } else { |
| // MOVL TLS, r |
| // MOVL (r)(TLS*1), r |
| p := gc.Prog(x86.AMOVL) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = x86.REG_TLS |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| q := gc.Prog(x86.AMOVL) |
| q.From.Type = obj.TYPE_MEM |
| q.From.Reg = r |
| q.From.Index = x86.REG_TLS |
| q.From.Scale = 1 |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = r |
| } |
| case ssa.Op386CALLstatic: |
| if v.Aux.(*gc.Sym) == gc.Deferreturn.Sym { |
| // Deferred calls will appear to be returning to |
| // the CALL deferreturn(SB) that we are about to emit. |
| // However, the stack trace code will show the line |
| // of the instruction byte before the return PC. |
| // To avoid that being an unrelated instruction, |
| // insert an actual hardware NOP that will have the right line number. |
| // This is different from obj.ANOP, which is a virtual no-op |
| // that doesn't make it into the instruction stream. |
| ginsnop() |
| } |
| p := gc.Prog(obj.ACALL) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Name = obj.NAME_EXTERN |
| p.To.Sym = gc.Linksym(v.Aux.(*gc.Sym)) |
| if gc.Maxarg < v.AuxInt { |
| gc.Maxarg = v.AuxInt |
| } |
| case ssa.Op386CALLclosure: |
| p := gc.Prog(obj.ACALL) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| if gc.Maxarg < v.AuxInt { |
| gc.Maxarg = v.AuxInt |
| } |
| case ssa.Op386CALLdefer: |
| p := gc.Prog(obj.ACALL) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Name = obj.NAME_EXTERN |
| p.To.Sym = gc.Linksym(gc.Deferproc.Sym) |
| if gc.Maxarg < v.AuxInt { |
| gc.Maxarg = v.AuxInt |
| } |
| case ssa.Op386CALLgo: |
| p := gc.Prog(obj.ACALL) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Name = obj.NAME_EXTERN |
| p.To.Sym = gc.Linksym(gc.Newproc.Sym) |
| if gc.Maxarg < v.AuxInt { |
| gc.Maxarg = v.AuxInt |
| } |
| case ssa.Op386CALLinter: |
| p := gc.Prog(obj.ACALL) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| if gc.Maxarg < v.AuxInt { |
| gc.Maxarg = v.AuxInt |
| } |
| case ssa.Op386NEGL, |
| ssa.Op386BSWAPL, |
| ssa.Op386NOTL: |
| r := gc.SSARegNum(v) |
| if r != gc.SSARegNum(v.Args[0]) { |
| v.Fatalf("input[0] and output not in same register %s", v.LongString()) |
| } |
| p := gc.Prog(v.Op.Asm()) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = r |
| case ssa.Op386BSFL, ssa.Op386BSFW, |
| ssa.Op386BSRL, ssa.Op386BSRW, |
| ssa.Op386SQRTSD: |
| p := gc.Prog(v.Op.Asm()) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = gc.SSARegNum(v.Args[0]) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| case ssa.OpSP, ssa.OpSB, ssa.OpSelect0, ssa.OpSelect1: |
| // nothing to do |
| case ssa.Op386SETEQ, ssa.Op386SETNE, |
| ssa.Op386SETL, ssa.Op386SETLE, |
| ssa.Op386SETG, ssa.Op386SETGE, |
| ssa.Op386SETGF, ssa.Op386SETGEF, |
| ssa.Op386SETB, ssa.Op386SETBE, |
| ssa.Op386SETORD, ssa.Op386SETNAN, |
| ssa.Op386SETA, ssa.Op386SETAE: |
| p := gc.Prog(v.Op.Asm()) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| |
| case ssa.Op386SETNEF: |
| p := gc.Prog(v.Op.Asm()) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| q := gc.Prog(x86.ASETPS) |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = x86.REG_AX |
| opregreg(x86.AORL, gc.SSARegNum(v), x86.REG_AX) |
| |
| case ssa.Op386SETEQF: |
| p := gc.Prog(v.Op.Asm()) |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = gc.SSARegNum(v) |
| q := gc.Prog(x86.ASETPC) |
| q.To.Type = obj.TYPE_REG |
| q.To.Reg = x86.REG_AX |
| opregreg(x86.AANDL, gc.SSARegNum(v), x86.REG_AX) |
| |
| case ssa.Op386InvertFlags: |
| v.Fatalf("InvertFlags should never make it to codegen %v", v.LongString()) |
| case ssa.Op386FlagEQ, ssa.Op386FlagLT_ULT, ssa.Op386FlagLT_UGT, ssa.Op386FlagGT_ULT, ssa.Op386FlagGT_UGT: |
| v.Fatalf("Flag* ops should never make it to codegen %v", v.LongString()) |
| case ssa.Op386REPSTOSL: |
| gc.Prog(x86.AREP) |
| gc.Prog(x86.ASTOSL) |
| case ssa.Op386REPMOVSL: |
| gc.Prog(x86.AREP) |
| gc.Prog(x86.AMOVSL) |
| case ssa.OpVarDef: |
| gc.Gvardef(v.Aux.(*gc.Node)) |
| case ssa.OpVarKill: |
| gc.Gvarkill(v.Aux.(*gc.Node)) |
| case ssa.OpVarLive: |
| gc.Gvarlive(v.Aux.(*gc.Node)) |
| case ssa.OpKeepAlive: |
| if !v.Args[0].Type.IsPtrShaped() { |
| v.Fatalf("keeping non-pointer alive %v", v.Args[0]) |
| } |
| n, off := gc.AutoVar(v.Args[0]) |
| if n == nil { |
| v.Fatalf("KeepLive with non-spilled value %s %s", v, v.Args[0]) |
| } |
| if off != 0 { |
| v.Fatalf("KeepLive with non-zero offset spill location %s:%d", n, off) |
| } |
| gc.Gvarlive(n) |
| case ssa.Op386LoweredNilCheck: |
| // Optimization - if the subsequent block has a load or store |
| // at the same address, we don't need to issue this instruction. |
| mem := v.Args[1] |
| for _, w := range v.Block.Succs[0].Block().Values { |
| if w.Op == ssa.OpPhi { |
| if w.Type.IsMemory() { |
| mem = w |
| } |
| continue |
| } |
| if len(w.Args) == 0 || !w.Args[len(w.Args)-1].Type.IsMemory() { |
| // w doesn't use a store - can't be a memory op. |
| continue |
| } |
| if w.Args[len(w.Args)-1] != mem { |
| v.Fatalf("wrong store after nilcheck v=%s w=%s", v, w) |
| } |
| switch w.Op { |
| case ssa.Op386MOVLload, ssa.Op386MOVWload, ssa.Op386MOVBload, |
| ssa.Op386MOVLstore, ssa.Op386MOVWstore, ssa.Op386MOVBstore, |
| ssa.Op386MOVBLSXload, ssa.Op386MOVWLSXload, |
| ssa.Op386MOVSSload, ssa.Op386MOVSDload, |
| ssa.Op386MOVSSstore, ssa.Op386MOVSDstore: |
| if w.Args[0] == v.Args[0] && w.Aux == nil && w.AuxInt >= 0 && w.AuxInt < minZeroPage { |
| if gc.Debug_checknil != 0 && int(v.Line) > 1 { |
| gc.Warnl(v.Line, "removed nil check") |
| } |
| return |
| } |
| case ssa.Op386MOVLstoreconst, ssa.Op386MOVWstoreconst, ssa.Op386MOVBstoreconst: |
| off := ssa.ValAndOff(v.AuxInt).Off() |
| if w.Args[0] == v.Args[0] && w.Aux == nil && off >= 0 && off < minZeroPage { |
| if gc.Debug_checknil != 0 && int(v.Line) > 1 { |
| gc.Warnl(v.Line, "removed nil check") |
| } |
| return |
| } |
| } |
| if w.Type.IsMemory() { |
| if w.Op == ssa.OpVarDef || w.Op == ssa.OpVarKill || w.Op == ssa.OpVarLive { |
| // these ops are OK |
| mem = w |
| continue |
| } |
| // We can't delay the nil check past the next store. |
| break |
| } |
| } |
| // Issue a load which will fault if the input is nil. |
| // TODO: We currently use the 2-byte instruction TESTB AX, (reg). |
| // Should we use the 3-byte TESTB $0, (reg) instead? It is larger |
| // but it doesn't have false dependency on AX. |
| // Or maybe allocate an output register and use MOVL (reg),reg2 ? |
| // That trades clobbering flags for clobbering a register. |
| p := gc.Prog(x86.ATESTB) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = x86.REG_AX |
| p.To.Type = obj.TYPE_MEM |
| p.To.Reg = gc.SSARegNum(v.Args[0]) |
| gc.AddAux(&p.To, v) |
| if gc.Debug_checknil != 0 && v.Line > 1 { // v.Line==1 in generated wrappers |
| gc.Warnl(v.Line, "generated nil check") |
| } |
| case ssa.Op386FCHS: |
| v.Fatalf("FCHS in non-387 mode") |
| default: |
| v.Unimplementedf("genValue not implemented: %s", v.LongString()) |
| } |
| } |
| |
| var blockJump = [...]struct { |
| asm, invasm obj.As |
| }{ |
| ssa.Block386EQ: {x86.AJEQ, x86.AJNE}, |
| ssa.Block386NE: {x86.AJNE, x86.AJEQ}, |
| ssa.Block386LT: {x86.AJLT, x86.AJGE}, |
| ssa.Block386GE: {x86.AJGE, x86.AJLT}, |
| ssa.Block386LE: {x86.AJLE, x86.AJGT}, |
| ssa.Block386GT: {x86.AJGT, x86.AJLE}, |
| ssa.Block386ULT: {x86.AJCS, x86.AJCC}, |
| ssa.Block386UGE: {x86.AJCC, x86.AJCS}, |
| ssa.Block386UGT: {x86.AJHI, x86.AJLS}, |
| ssa.Block386ULE: {x86.AJLS, x86.AJHI}, |
| ssa.Block386ORD: {x86.AJPC, x86.AJPS}, |
| ssa.Block386NAN: {x86.AJPS, x86.AJPC}, |
| } |
| |
| var eqfJumps = [2][2]gc.FloatingEQNEJump{ |
| {{Jump: x86.AJNE, Index: 1}, {Jump: x86.AJPS, Index: 1}}, // next == b.Succs[0] |
| {{Jump: x86.AJNE, Index: 1}, {Jump: x86.AJPC, Index: 0}}, // next == b.Succs[1] |
| } |
| var nefJumps = [2][2]gc.FloatingEQNEJump{ |
| {{Jump: x86.AJNE, Index: 0}, {Jump: x86.AJPC, Index: 1}}, // next == b.Succs[0] |
| {{Jump: x86.AJNE, Index: 0}, {Jump: x86.AJPS, Index: 0}}, // next == b.Succs[1] |
| } |
| |
| func ssaGenBlock(s *gc.SSAGenState, b, next *ssa.Block) { |
| s.SetLineno(b.Line) |
| |
| if gc.Thearch.Use387 { |
| // Empty the 387's FP stack before the block ends. |
| flush387(s) |
| } |
| |
| switch b.Kind { |
| case ssa.BlockPlain, ssa.BlockCall, ssa.BlockCheck: |
| if b.Succs[0].Block() != next { |
| p := gc.Prog(obj.AJMP) |
| p.To.Type = obj.TYPE_BRANCH |
| s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()}) |
| } |
| case ssa.BlockDefer: |
| // defer returns in rax: |
| // 0 if we should continue executing |
| // 1 if we should jump to deferreturn call |
| p := gc.Prog(x86.ATESTL) |
| p.From.Type = obj.TYPE_REG |
| p.From.Reg = x86.REG_AX |
| p.To.Type = obj.TYPE_REG |
| p.To.Reg = x86.REG_AX |
| p = gc.Prog(x86.AJNE) |
| p.To.Type = obj.TYPE_BRANCH |
| s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[1].Block()}) |
| if b.Succs[0].Block() != next { |
| p := gc.Prog(obj.AJMP) |
| p.To.Type = obj.TYPE_BRANCH |
| s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()}) |
| } |
| case ssa.BlockExit: |
| gc.Prog(obj.AUNDEF) // tell plive.go that we never reach here |
| case ssa.BlockRet: |
| gc.Prog(obj.ARET) |
| case ssa.BlockRetJmp: |
| p := gc.Prog(obj.AJMP) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Name = obj.NAME_EXTERN |
| p.To.Sym = gc.Linksym(b.Aux.(*gc.Sym)) |
| |
| case ssa.Block386EQF: |
| gc.SSAGenFPJump(s, b, next, &eqfJumps) |
| |
| case ssa.Block386NEF: |
| gc.SSAGenFPJump(s, b, next, &nefJumps) |
| |
| case ssa.Block386EQ, ssa.Block386NE, |
| ssa.Block386LT, ssa.Block386GE, |
| ssa.Block386LE, ssa.Block386GT, |
| ssa.Block386ULT, ssa.Block386UGT, |
| ssa.Block386ULE, ssa.Block386UGE: |
| jmp := blockJump[b.Kind] |
| likely := b.Likely |
| var p *obj.Prog |
| switch next { |
| case b.Succs[0].Block(): |
| p = gc.Prog(jmp.invasm) |
| likely *= -1 |
| p.To.Type = obj.TYPE_BRANCH |
| s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[1].Block()}) |
| case b.Succs[1].Block(): |
| p = gc.Prog(jmp.asm) |
| p.To.Type = obj.TYPE_BRANCH |
| s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()}) |
| default: |
| p = gc.Prog(jmp.asm) |
| p.To.Type = obj.TYPE_BRANCH |
| s.Branches = append(s.Branches, gc.Branch{P: p, B: b.Succs[0].Block()}) |
| q := gc.Prog(obj.AJMP) |
| q.To.Type = obj.TYPE_BRANCH |
| s.Branches = append(s.Branches, gc.Branch{P: q, B: b.Succs[1].Block()}) |
| } |
| |
| // liblink reorders the instruction stream as it sees fit. |
| // Pass along what we know so liblink can make use of it. |
| // TODO: Once we've fully switched to SSA, |
| // make liblink leave our output alone. |
| switch likely { |
| case ssa.BranchUnlikely: |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = 0 |
| case ssa.BranchLikely: |
| p.From.Type = obj.TYPE_CONST |
| p.From.Offset = 1 |
| } |
| |
| default: |
| b.Unimplementedf("branch not implemented: %s. Control: %s", b.LongString(), b.Control.LongString()) |
| } |
| } |
