// 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 amd64 import ( "fmt" "internal/buildcfg" "math" "cmd/compile/internal/base" "cmd/compile/internal/ir" "cmd/compile/internal/logopt" "cmd/compile/internal/objw" "cmd/compile/internal/ssa" "cmd/compile/internal/ssagen" "cmd/compile/internal/types" "cmd/internal/obj" "cmd/internal/obj/x86" ) // markMoves marks any MOVXconst ops that need to avoid clobbering flags. func ssaMarkMoves(s *ssagen.State, b *ssa.Block) { flive := b.FlagsLiveAtEnd for _, c := range b.ControlValues() { flive = c.Type.IsFlags() || flive } for i := len(b.Values) - 1; i >= 0; i-- { v := b.Values[i] if flive && (v.Op == ssa.OpAMD64MOVLconst || v.Op == ssa.OpAMD64MOVQconst) { // 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 *types.Type) obj.As { // Avoid partial register write if !t.IsFloat() { switch t.Size() { case 1: return x86.AMOVBLZX case 2: 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 *types.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 case 8: return x86.AMOVQ } } panic(fmt.Sprintf("bad store type %v", t)) } // moveByType returns the reg->reg move instruction of the given type. func moveByType(t *types.Type) obj.As { if t.IsFloat() { // Moving the whole sse2 register is faster // than moving just the correct low portion of it. // There is no xmm->xmm move with 1 byte opcode, // so use movups, which has 2 byte opcode. return x86.AMOVUPS } else { switch t.Size() { case 1: // Avoids partial register write return x86.AMOVL case 2: return x86.AMOVL case 4: return x86.AMOVL case 8: return x86.AMOVQ case 16: return x86.AMOVUPS // int128s are in SSE registers default: panic(fmt.Sprintf("bad int register width %d:%v", 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(s *ssagen.State, op obj.As, dest, src int16) *obj.Prog { p := s.Prog(op) p.From.Type = obj.TYPE_REG p.To.Type = obj.TYPE_REG p.To.Reg = dest p.From.Reg = src return p } // memIdx fills out a as an indexed memory reference for v. // It assumes that the base register and the index register // are v.Args[0].Reg() and v.Args[1].Reg(), respectively. // The caller must still use gc.AddAux/gc.AddAux2 to handle v.Aux as necessary. func memIdx(a *obj.Addr, v *ssa.Value) { r, i := v.Args[0].Reg(), v.Args[1].Reg() a.Type = obj.TYPE_MEM a.Scale = v.Op.Scale() if a.Scale == 1 && i == x86.REG_SP { r, i = i, r } a.Reg = r a.Index = i } // DUFFZERO consists of repeated blocks of 4 MOVUPSs + LEAQ, // See runtime/mkduff.go. func duffStart(size int64) int64 { x, _ := duff(size) return x } func duffAdj(size int64) int64 { _, x := duff(size) return x } // duff returns the offset (from duffzero, in bytes) and pointer adjust (in bytes) // required to use the duffzero mechanism for a block of the given size. func duff(size int64) (int64, int64) { if size < 32 || size > 1024 || size%dzClearStep != 0 { panic("bad duffzero size") } steps := size / dzClearStep blocks := steps / dzBlockLen steps %= dzBlockLen off := dzBlockSize * (dzBlocks - blocks) var adj int64 if steps != 0 { off -= dzLeaqSize off -= dzMovSize * steps adj -= dzClearStep * (dzBlockLen - steps) } return off, adj } func getgFromTLS(s *ssagen.State, r int16) { // See the comments in cmd/internal/obj/x86/obj6.go // near CanUse1InsnTLS for a detailed explanation of these instructions. if x86.CanUse1InsnTLS(base.Ctxt) { // MOVQ (TLS), r p := s.Prog(x86.AMOVQ) p.From.Type = obj.TYPE_MEM p.From.Reg = x86.REG_TLS p.To.Type = obj.TYPE_REG p.To.Reg = r } else { // MOVQ TLS, r // MOVQ (r)(TLS*1), r p := s.Prog(x86.AMOVQ) p.From.Type = obj.TYPE_REG p.From.Reg = x86.REG_TLS p.To.Type = obj.TYPE_REG p.To.Reg = r q := s.Prog(x86.AMOVQ) 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 } } func ssaGenValue(s *ssagen.State, v *ssa.Value) { switch v.Op { case ssa.OpAMD64VFMADD231SD: p := s.Prog(v.Op.Asm()) p.From = obj.Addr{Type: obj.TYPE_REG, Reg: v.Args[2].Reg()} p.To = obj.Addr{Type: obj.TYPE_REG, Reg: v.Reg()} p.SetFrom3Reg(v.Args[1].Reg()) case ssa.OpAMD64ADDQ, ssa.OpAMD64ADDL: r := v.Reg() r1 := v.Args[0].Reg() r2 := v.Args[1].Reg() switch { case r == r1: p := s.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 := s.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: var asm obj.As if v.Op == ssa.OpAMD64ADDQ { asm = x86.ALEAQ } else { asm = x86.ALEAL } p := s.Prog(asm) 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.OpAMD64SUBQ, ssa.OpAMD64SUBL, ssa.OpAMD64MULQ, ssa.OpAMD64MULL, ssa.OpAMD64ANDQ, ssa.OpAMD64ANDL, ssa.OpAMD64ORQ, ssa.OpAMD64ORL, ssa.OpAMD64XORQ, ssa.OpAMD64XORL, ssa.OpAMD64SHLQ, ssa.OpAMD64SHLL, ssa.OpAMD64SHRQ, ssa.OpAMD64SHRL, ssa.OpAMD64SHRW, ssa.OpAMD64SHRB, ssa.OpAMD64SARQ, ssa.OpAMD64SARL, ssa.OpAMD64SARW, ssa.OpAMD64SARB, ssa.OpAMD64ROLQ, ssa.OpAMD64ROLL, ssa.OpAMD64ROLW, ssa.OpAMD64ROLB, ssa.OpAMD64RORQ, ssa.OpAMD64RORL, ssa.OpAMD64RORW, ssa.OpAMD64RORB, ssa.OpAMD64ADDSS, ssa.OpAMD64ADDSD, ssa.OpAMD64SUBSS, ssa.OpAMD64SUBSD, ssa.OpAMD64MULSS, ssa.OpAMD64MULSD, ssa.OpAMD64DIVSS, ssa.OpAMD64DIVSD, ssa.OpAMD64PXOR, ssa.OpAMD64BTSL, ssa.OpAMD64BTSQ, ssa.OpAMD64BTCL, ssa.OpAMD64BTCQ, ssa.OpAMD64BTRL, ssa.OpAMD64BTRQ: opregreg(s, v.Op.Asm(), v.Reg(), v.Args[1].Reg()) case ssa.OpAMD64SHRDQ, ssa.OpAMD64SHLDQ: p := s.Prog(v.Op.Asm()) lo, hi, bits := v.Args[0].Reg(), v.Args[1].Reg(), v.Args[2].Reg() p.From.Type = obj.TYPE_REG p.From.Reg = bits p.To.Type = obj.TYPE_REG p.To.Reg = lo p.SetFrom3Reg(hi) case ssa.OpAMD64BLSIQ, ssa.OpAMD64BLSIL, ssa.OpAMD64BLSMSKQ, ssa.OpAMD64BLSMSKL, ssa.OpAMD64BLSRQ, ssa.OpAMD64BLSRL, ssa.OpAMD64TZCNTQ, ssa.OpAMD64TZCNTL: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[0].Reg() p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64ANDNQ, ssa.OpAMD64ANDNL: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[0].Reg() p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() p.SetFrom3Reg(v.Args[1].Reg()) case ssa.OpAMD64DIVQU, ssa.OpAMD64DIVLU, ssa.OpAMD64DIVWU: // Arg[0] (the dividend) is in AX. // Arg[1] (the divisor) can be in any other register. // Result[0] (the quotient) is in AX. // Result[1] (the remainder) is in DX. r := v.Args[1].Reg() // Zero extend dividend. c := s.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 // Issue divide. p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = r case ssa.OpAMD64DIVQ, ssa.OpAMD64DIVL, ssa.OpAMD64DIVW: // Arg[0] (the dividend) is in AX. // Arg[1] (the divisor) can be in any other register. // Result[0] (the quotient) is in AX. // Result[1] (the remainder) is in DX. r := v.Args[1].Reg() var j1 *obj.Prog // CPU faults upon signed overflow, which occurs when the most // negative int is divided by -1. Handle divide by -1 as a special case. if ssa.DivisionNeedsFixUp(v) { var c *obj.Prog switch v.Op { case ssa.OpAMD64DIVQ: c = s.Prog(x86.ACMPQ) case ssa.OpAMD64DIVL: c = s.Prog(x86.ACMPL) case ssa.OpAMD64DIVW: c = s.Prog(x86.ACMPW) } c.From.Type = obj.TYPE_REG c.From.Reg = r c.To.Type = obj.TYPE_CONST c.To.Offset = -1 j1 = s.Prog(x86.AJEQ) j1.To.Type = obj.TYPE_BRANCH } // Sign extend dividend. switch v.Op { case ssa.OpAMD64DIVQ: s.Prog(x86.ACQO) case ssa.OpAMD64DIVL: s.Prog(x86.ACDQ) case ssa.OpAMD64DIVW: s.Prog(x86.ACWD) } // Issue divide. p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = r if j1 != nil { // Skip over -1 fixup code. j2 := s.Prog(obj.AJMP) j2.To.Type = obj.TYPE_BRANCH // Issue -1 fixup code. // n / -1 = -n var n1 *obj.Prog switch v.Op { case ssa.OpAMD64DIVQ: n1 = s.Prog(x86.ANEGQ) case ssa.OpAMD64DIVL: n1 = s.Prog(x86.ANEGL) case ssa.OpAMD64DIVW: n1 = s.Prog(x86.ANEGW) } n1.To.Type = obj.TYPE_REG n1.To.Reg = x86.REG_AX // n % -1 == 0 n2 := s.Prog(x86.AXORL) n2.From.Type = obj.TYPE_REG n2.From.Reg = x86.REG_DX n2.To.Type = obj.TYPE_REG n2.To.Reg = x86.REG_DX // TODO(khr): issue only the -1 fixup code we need. // For instance, if only the quotient is used, no point in zeroing the remainder. j1.To.SetTarget(n1) j2.To.SetTarget(s.Pc()) } case ssa.OpAMD64HMULQ, ssa.OpAMD64HMULL, ssa.OpAMD64HMULQU, ssa.OpAMD64HMULLU: // 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 := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[1].Reg() // IMULB puts the high portion in AH instead of DL, // so move it to DL for consistency if v.Type.Size() == 1 { m := s.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.OpAMD64MULQU, ssa.OpAMD64MULLU: // Arg[0] is already in AX as it's the only register we allow // results lo in AX p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[1].Reg() case ssa.OpAMD64MULQU2: // Arg[0] is already in AX as it's the only register we allow // results hi in DX, lo in AX p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[1].Reg() case ssa.OpAMD64DIVQU2: // Arg[0], Arg[1] are already in Dx, AX, as they're the only registers we allow // results q in AX, r in DX p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[2].Reg() case ssa.OpAMD64AVGQU: // compute (x+y)/2 unsigned. // Do a 64-bit add, the overflow goes into the carry. // Shift right once and pull the carry back into the 63rd bit. p := s.Prog(x86.AADDQ) p.From.Type = obj.TYPE_REG p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() p.From.Reg = v.Args[1].Reg() p = s.Prog(x86.ARCRQ) p.From.Type = obj.TYPE_CONST p.From.Offset = 1 p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64ADDQcarry, ssa.OpAMD64ADCQ: r := v.Reg0() r0 := v.Args[0].Reg() r1 := v.Args[1].Reg() switch r { case r0: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = r1 p.To.Type = obj.TYPE_REG p.To.Reg = r case r1: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = r0 p.To.Type = obj.TYPE_REG p.To.Reg = r default: v.Fatalf("output not in same register as an input %s", v.LongString()) } case ssa.OpAMD64SUBQborrow, ssa.OpAMD64SBBQ: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[1].Reg() p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg0() case ssa.OpAMD64ADDQconstcarry, ssa.OpAMD64ADCQconst, ssa.OpAMD64SUBQconstborrow, ssa.OpAMD64SBBQconst: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_CONST p.From.Offset = v.AuxInt p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg0() case ssa.OpAMD64ADDQconst, ssa.OpAMD64ADDLconst: r := v.Reg() a := v.Args[0].Reg() if r == a { switch v.AuxInt { case 1: var asm obj.As // Software optimization manual recommends add $1,reg. // But inc/dec is 1 byte smaller. ICC always uses inc // Clang/GCC choose depending on flags, but prefer add. // Experiments show that inc/dec is both a little faster // and make a binary a little smaller. if v.Op == ssa.OpAMD64ADDQconst { asm = x86.AINCQ } else { asm = x86.AINCL } p := s.Prog(asm) p.To.Type = obj.TYPE_REG p.To.Reg = r return case -1: var asm obj.As if v.Op == ssa.OpAMD64ADDQconst { asm = x86.ADECQ } else { asm = x86.ADECL } p := s.Prog(asm) p.To.Type = obj.TYPE_REG p.To.Reg = r return case 0x80: // 'SUBQ $-0x80, r' is shorter to encode than // and functionally equivalent to 'ADDQ $0x80, r'. asm := x86.ASUBL if v.Op == ssa.OpAMD64ADDQconst { asm = x86.ASUBQ } p := s.Prog(asm) p.From.Type = obj.TYPE_CONST p.From.Offset = -0x80 p.To.Type = obj.TYPE_REG p.To.Reg = r return } p := s.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 } var asm obj.As if v.Op == ssa.OpAMD64ADDQconst { asm = x86.ALEAQ } else { asm = x86.ALEAL } p := s.Prog(asm) 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.OpAMD64CMOVQEQ, ssa.OpAMD64CMOVLEQ, ssa.OpAMD64CMOVWEQ, ssa.OpAMD64CMOVQLT, ssa.OpAMD64CMOVLLT, ssa.OpAMD64CMOVWLT, ssa.OpAMD64CMOVQNE, ssa.OpAMD64CMOVLNE, ssa.OpAMD64CMOVWNE, ssa.OpAMD64CMOVQGT, ssa.OpAMD64CMOVLGT, ssa.OpAMD64CMOVWGT, ssa.OpAMD64CMOVQLE, ssa.OpAMD64CMOVLLE, ssa.OpAMD64CMOVWLE, ssa.OpAMD64CMOVQGE, ssa.OpAMD64CMOVLGE, ssa.OpAMD64CMOVWGE, ssa.OpAMD64CMOVQHI, ssa.OpAMD64CMOVLHI, ssa.OpAMD64CMOVWHI, ssa.OpAMD64CMOVQLS, ssa.OpAMD64CMOVLLS, ssa.OpAMD64CMOVWLS, ssa.OpAMD64CMOVQCC, ssa.OpAMD64CMOVLCC, ssa.OpAMD64CMOVWCC, ssa.OpAMD64CMOVQCS, ssa.OpAMD64CMOVLCS, ssa.OpAMD64CMOVWCS, ssa.OpAMD64CMOVQGTF, ssa.OpAMD64CMOVLGTF, ssa.OpAMD64CMOVWGTF, ssa.OpAMD64CMOVQGEF, ssa.OpAMD64CMOVLGEF, ssa.OpAMD64CMOVWGEF: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[1].Reg() p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64CMOVQNEF, ssa.OpAMD64CMOVLNEF, ssa.OpAMD64CMOVWNEF: // Flag condition: ^ZERO || PARITY // Generate: // CMOV*NE SRC,DST // CMOV*PS SRC,DST p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[1].Reg() p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() var q *obj.Prog if v.Op == ssa.OpAMD64CMOVQNEF { q = s.Prog(x86.ACMOVQPS) } else if v.Op == ssa.OpAMD64CMOVLNEF { q = s.Prog(x86.ACMOVLPS) } else { q = s.Prog(x86.ACMOVWPS) } q.From.Type = obj.TYPE_REG q.From.Reg = v.Args[1].Reg() q.To.Type = obj.TYPE_REG q.To.Reg = v.Reg() case ssa.OpAMD64CMOVQEQF, ssa.OpAMD64CMOVLEQF, ssa.OpAMD64CMOVWEQF: // Flag condition: ZERO && !PARITY // Generate: // MOV SRC,AX // CMOV*NE DST,AX // CMOV*PC AX,DST // // TODO(rasky): we could generate: // CMOV*NE DST,SRC // CMOV*PC SRC,DST // But this requires a way for regalloc to know that SRC might be // clobbered by this instruction. if v.Args[1].Reg() != x86.REG_AX { opregreg(s, moveByType(v.Type), x86.REG_AX, v.Args[1].Reg()) } p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Reg() p.To.Type = obj.TYPE_REG p.To.Reg = x86.REG_AX var q *obj.Prog if v.Op == ssa.OpAMD64CMOVQEQF { q = s.Prog(x86.ACMOVQPC) } else if v.Op == ssa.OpAMD64CMOVLEQF { q = s.Prog(x86.ACMOVLPC) } else { q = s.Prog(x86.ACMOVWPC) } q.From.Type = obj.TYPE_REG q.From.Reg = x86.REG_AX q.To.Type = obj.TYPE_REG q.To.Reg = v.Reg() case ssa.OpAMD64MULQconst, ssa.OpAMD64MULLconst: r := v.Reg() p := s.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 p.SetFrom3Reg(v.Args[0].Reg()) case ssa.OpAMD64ANDQconst: asm := v.Op.Asm() // If the constant is positive and fits into 32 bits, use ANDL. // This saves a few bytes of encoding. if 0 <= v.AuxInt && v.AuxInt <= (1<<32-1) { asm = x86.AANDL } p := s.Prog(asm) p.From.Type = obj.TYPE_CONST p.From.Offset = v.AuxInt p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64SUBQconst, ssa.OpAMD64SUBLconst, ssa.OpAMD64ANDLconst, ssa.OpAMD64ORQconst, ssa.OpAMD64ORLconst, ssa.OpAMD64XORQconst, ssa.OpAMD64XORLconst, ssa.OpAMD64SHLQconst, ssa.OpAMD64SHLLconst, ssa.OpAMD64SHRQconst, ssa.OpAMD64SHRLconst, ssa.OpAMD64SHRWconst, ssa.OpAMD64SHRBconst, ssa.OpAMD64SARQconst, ssa.OpAMD64SARLconst, ssa.OpAMD64SARWconst, ssa.OpAMD64SARBconst, ssa.OpAMD64ROLQconst, ssa.OpAMD64ROLLconst, ssa.OpAMD64ROLWconst, ssa.OpAMD64ROLBconst: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_CONST p.From.Offset = v.AuxInt p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64SBBQcarrymask, ssa.OpAMD64SBBLcarrymask: r := v.Reg() p := s.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.OpAMD64LEAQ1, ssa.OpAMD64LEAQ2, ssa.OpAMD64LEAQ4, ssa.OpAMD64LEAQ8, ssa.OpAMD64LEAL1, ssa.OpAMD64LEAL2, ssa.OpAMD64LEAL4, ssa.OpAMD64LEAL8, ssa.OpAMD64LEAW1, ssa.OpAMD64LEAW2, ssa.OpAMD64LEAW4, ssa.OpAMD64LEAW8: p := s.Prog(v.Op.Asm()) memIdx(&p.From, v) o := v.Reg() p.To.Type = obj.TYPE_REG p.To.Reg = o if v.AuxInt != 0 && v.Aux == nil { // Emit an additional LEA to add the displacement instead of creating a slow 3 operand LEA. switch v.Op { case ssa.OpAMD64LEAQ1, ssa.OpAMD64LEAQ2, ssa.OpAMD64LEAQ4, ssa.OpAMD64LEAQ8: p = s.Prog(x86.ALEAQ) case ssa.OpAMD64LEAL1, ssa.OpAMD64LEAL2, ssa.OpAMD64LEAL4, ssa.OpAMD64LEAL8: p = s.Prog(x86.ALEAL) case ssa.OpAMD64LEAW1, ssa.OpAMD64LEAW2, ssa.OpAMD64LEAW4, ssa.OpAMD64LEAW8: p = s.Prog(x86.ALEAW) } p.From.Type = obj.TYPE_MEM p.From.Reg = o p.To.Type = obj.TYPE_REG p.To.Reg = o } ssagen.AddAux(&p.From, v) case ssa.OpAMD64LEAQ, ssa.OpAMD64LEAL, ssa.OpAMD64LEAW: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_MEM p.From.Reg = v.Args[0].Reg() ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64CMPQ, ssa.OpAMD64CMPL, ssa.OpAMD64CMPW, ssa.OpAMD64CMPB, ssa.OpAMD64TESTQ, ssa.OpAMD64TESTL, ssa.OpAMD64TESTW, ssa.OpAMD64TESTB, ssa.OpAMD64BTL, ssa.OpAMD64BTQ: opregreg(s, v.Op.Asm(), v.Args[1].Reg(), v.Args[0].Reg()) case ssa.OpAMD64UCOMISS, ssa.OpAMD64UCOMISD: // Go assembler has swapped operands for UCOMISx relative to CMP, // must account for that right here. opregreg(s, v.Op.Asm(), v.Args[0].Reg(), v.Args[1].Reg()) case ssa.OpAMD64CMPQconst, ssa.OpAMD64CMPLconst, ssa.OpAMD64CMPWconst, ssa.OpAMD64CMPBconst: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[0].Reg() p.To.Type = obj.TYPE_CONST p.To.Offset = v.AuxInt case ssa.OpAMD64BTLconst, ssa.OpAMD64BTQconst, ssa.OpAMD64TESTQconst, ssa.OpAMD64TESTLconst, ssa.OpAMD64TESTWconst, ssa.OpAMD64TESTBconst, ssa.OpAMD64BTSLconst, ssa.OpAMD64BTSQconst, ssa.OpAMD64BTCLconst, ssa.OpAMD64BTCQconst, ssa.OpAMD64BTRLconst, ssa.OpAMD64BTRQconst: op := v.Op if op == ssa.OpAMD64BTQconst && v.AuxInt < 32 { // Emit 32-bit version because it's shorter op = ssa.OpAMD64BTLconst } p := s.Prog(op.Asm()) p.From.Type = obj.TYPE_CONST p.From.Offset = v.AuxInt p.To.Type = obj.TYPE_REG p.To.Reg = v.Args[0].Reg() case ssa.OpAMD64CMPQload, ssa.OpAMD64CMPLload, ssa.OpAMD64CMPWload, ssa.OpAMD64CMPBload: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_MEM p.From.Reg = v.Args[0].Reg() ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Args[1].Reg() case ssa.OpAMD64CMPQconstload, ssa.OpAMD64CMPLconstload, ssa.OpAMD64CMPWconstload, ssa.OpAMD64CMPBconstload: sc := v.AuxValAndOff() p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_MEM p.From.Reg = v.Args[0].Reg() ssagen.AddAux2(&p.From, v, sc.Off64()) p.To.Type = obj.TYPE_CONST p.To.Offset = sc.Val64() case ssa.OpAMD64CMPQloadidx8, ssa.OpAMD64CMPQloadidx1, ssa.OpAMD64CMPLloadidx4, ssa.OpAMD64CMPLloadidx1, ssa.OpAMD64CMPWloadidx2, ssa.OpAMD64CMPWloadidx1, ssa.OpAMD64CMPBloadidx1: p := s.Prog(v.Op.Asm()) memIdx(&p.From, v) ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Args[2].Reg() case ssa.OpAMD64CMPQconstloadidx8, ssa.OpAMD64CMPQconstloadidx1, ssa.OpAMD64CMPLconstloadidx4, ssa.OpAMD64CMPLconstloadidx1, ssa.OpAMD64CMPWconstloadidx2, ssa.OpAMD64CMPWconstloadidx1, ssa.OpAMD64CMPBconstloadidx1: sc := v.AuxValAndOff() p := s.Prog(v.Op.Asm()) memIdx(&p.From, v) ssagen.AddAux2(&p.From, v, sc.Off64()) p.To.Type = obj.TYPE_CONST p.To.Offset = sc.Val64() case ssa.OpAMD64MOVLconst, ssa.OpAMD64MOVQconst: x := v.Reg() // If flags aren't live (indicated by v.Aux == nil), // then we can rewrite MOV $0, AX into XOR AX, AX. if v.AuxInt == 0 && v.Aux == nil { p := s.Prog(x86.AXORL) p.From.Type = obj.TYPE_REG p.From.Reg = x p.To.Type = obj.TYPE_REG p.To.Reg = x break } asm := v.Op.Asm() // Use MOVL to move a small constant into a register // when the constant is positive and fits into 32 bits. if 0 <= v.AuxInt && v.AuxInt <= (1<<32-1) { // The upper 32bit are zeroed automatically when using MOVL. asm = x86.AMOVL } p := s.Prog(asm) p.From.Type = obj.TYPE_CONST p.From.Offset = v.AuxInt p.To.Type = obj.TYPE_REG p.To.Reg = x case ssa.OpAMD64MOVSSconst, ssa.OpAMD64MOVSDconst: x := v.Reg() p := s.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.OpAMD64MOVQload, ssa.OpAMD64MOVLload, ssa.OpAMD64MOVWload, ssa.OpAMD64MOVBload, ssa.OpAMD64MOVOload, ssa.OpAMD64MOVSSload, ssa.OpAMD64MOVSDload, ssa.OpAMD64MOVBQSXload, ssa.OpAMD64MOVWQSXload, ssa.OpAMD64MOVLQSXload, ssa.OpAMD64MOVBEQload, ssa.OpAMD64MOVBELload: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_MEM p.From.Reg = v.Args[0].Reg() ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64MOVBloadidx1, ssa.OpAMD64MOVWloadidx1, ssa.OpAMD64MOVLloadidx1, ssa.OpAMD64MOVQloadidx1, ssa.OpAMD64MOVSSloadidx1, ssa.OpAMD64MOVSDloadidx1, ssa.OpAMD64MOVQloadidx8, ssa.OpAMD64MOVSDloadidx8, ssa.OpAMD64MOVLloadidx8, ssa.OpAMD64MOVLloadidx4, ssa.OpAMD64MOVSSloadidx4, ssa.OpAMD64MOVWloadidx2: p := s.Prog(v.Op.Asm()) memIdx(&p.From, v) ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64MOVQstore, ssa.OpAMD64MOVSSstore, ssa.OpAMD64MOVSDstore, ssa.OpAMD64MOVLstore, ssa.OpAMD64MOVWstore, ssa.OpAMD64MOVBstore, ssa.OpAMD64MOVOstore, ssa.OpAMD64ADDQmodify, ssa.OpAMD64SUBQmodify, ssa.OpAMD64ANDQmodify, ssa.OpAMD64ORQmodify, ssa.OpAMD64XORQmodify, ssa.OpAMD64ADDLmodify, ssa.OpAMD64SUBLmodify, ssa.OpAMD64ANDLmodify, ssa.OpAMD64ORLmodify, ssa.OpAMD64XORLmodify, ssa.OpAMD64MOVBEQstore, ssa.OpAMD64MOVBELstore: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[1].Reg() p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() ssagen.AddAux(&p.To, v) case ssa.OpAMD64MOVBstoreidx1, ssa.OpAMD64MOVWstoreidx1, ssa.OpAMD64MOVLstoreidx1, ssa.OpAMD64MOVQstoreidx1, ssa.OpAMD64MOVSSstoreidx1, ssa.OpAMD64MOVSDstoreidx1, ssa.OpAMD64MOVQstoreidx8, ssa.OpAMD64MOVSDstoreidx8, ssa.OpAMD64MOVLstoreidx8, ssa.OpAMD64MOVSSstoreidx4, ssa.OpAMD64MOVLstoreidx4, ssa.OpAMD64MOVWstoreidx2, ssa.OpAMD64ADDLmodifyidx1, ssa.OpAMD64ADDLmodifyidx4, ssa.OpAMD64ADDLmodifyidx8, ssa.OpAMD64ADDQmodifyidx1, ssa.OpAMD64ADDQmodifyidx8, ssa.OpAMD64SUBLmodifyidx1, ssa.OpAMD64SUBLmodifyidx4, ssa.OpAMD64SUBLmodifyidx8, ssa.OpAMD64SUBQmodifyidx1, ssa.OpAMD64SUBQmodifyidx8, ssa.OpAMD64ANDLmodifyidx1, ssa.OpAMD64ANDLmodifyidx4, ssa.OpAMD64ANDLmodifyidx8, ssa.OpAMD64ANDQmodifyidx1, ssa.OpAMD64ANDQmodifyidx8, ssa.OpAMD64ORLmodifyidx1, ssa.OpAMD64ORLmodifyidx4, ssa.OpAMD64ORLmodifyidx8, ssa.OpAMD64ORQmodifyidx1, ssa.OpAMD64ORQmodifyidx8, ssa.OpAMD64XORLmodifyidx1, ssa.OpAMD64XORLmodifyidx4, ssa.OpAMD64XORLmodifyidx8, ssa.OpAMD64XORQmodifyidx1, ssa.OpAMD64XORQmodifyidx8: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[2].Reg() memIdx(&p.To, v) ssagen.AddAux(&p.To, v) case ssa.OpAMD64ADDQconstmodify, ssa.OpAMD64ADDLconstmodify: sc := v.AuxValAndOff() off := sc.Off64() val := sc.Val() if val == 1 || val == -1 { var asm obj.As if v.Op == ssa.OpAMD64ADDQconstmodify { if val == 1 { asm = x86.AINCQ } else { asm = x86.ADECQ } } else { if val == 1 { asm = x86.AINCL } else { asm = x86.ADECL } } p := s.Prog(asm) p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() ssagen.AddAux2(&p.To, v, off) break } fallthrough case ssa.OpAMD64ANDQconstmodify, ssa.OpAMD64ANDLconstmodify, ssa.OpAMD64ORQconstmodify, ssa.OpAMD64ORLconstmodify, ssa.OpAMD64XORQconstmodify, ssa.OpAMD64XORLconstmodify: sc := v.AuxValAndOff() off := sc.Off64() val := sc.Val64() p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_CONST p.From.Offset = val p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() ssagen.AddAux2(&p.To, v, off) case ssa.OpAMD64MOVQstoreconst, ssa.OpAMD64MOVLstoreconst, ssa.OpAMD64MOVWstoreconst, ssa.OpAMD64MOVBstoreconst: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_CONST sc := v.AuxValAndOff() p.From.Offset = sc.Val64() p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() ssagen.AddAux2(&p.To, v, sc.Off64()) case ssa.OpAMD64MOVOstoreconst: sc := v.AuxValAndOff() if sc.Val() != 0 { v.Fatalf("MOVO for non zero constants not implemented: %s", v.LongString()) } if s.ABI != obj.ABIInternal { // zero X15 manually opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15) } p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = x86.REG_X15 p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() ssagen.AddAux2(&p.To, v, sc.Off64()) case ssa.OpAMD64MOVQstoreconstidx1, ssa.OpAMD64MOVQstoreconstidx8, ssa.OpAMD64MOVLstoreconstidx1, ssa.OpAMD64MOVLstoreconstidx4, ssa.OpAMD64MOVWstoreconstidx1, ssa.OpAMD64MOVWstoreconstidx2, ssa.OpAMD64MOVBstoreconstidx1, ssa.OpAMD64ADDLconstmodifyidx1, ssa.OpAMD64ADDLconstmodifyidx4, ssa.OpAMD64ADDLconstmodifyidx8, ssa.OpAMD64ADDQconstmodifyidx1, ssa.OpAMD64ADDQconstmodifyidx8, ssa.OpAMD64ANDLconstmodifyidx1, ssa.OpAMD64ANDLconstmodifyidx4, ssa.OpAMD64ANDLconstmodifyidx8, ssa.OpAMD64ANDQconstmodifyidx1, ssa.OpAMD64ANDQconstmodifyidx8, ssa.OpAMD64ORLconstmodifyidx1, ssa.OpAMD64ORLconstmodifyidx4, ssa.OpAMD64ORLconstmodifyidx8, ssa.OpAMD64ORQconstmodifyidx1, ssa.OpAMD64ORQconstmodifyidx8, ssa.OpAMD64XORLconstmodifyidx1, ssa.OpAMD64XORLconstmodifyidx4, ssa.OpAMD64XORLconstmodifyidx8, ssa.OpAMD64XORQconstmodifyidx1, ssa.OpAMD64XORQconstmodifyidx8: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_CONST sc := v.AuxValAndOff() p.From.Offset = sc.Val64() switch { case p.As == x86.AADDQ && p.From.Offset == 1: p.As = x86.AINCQ p.From.Type = obj.TYPE_NONE case p.As == x86.AADDQ && p.From.Offset == -1: p.As = x86.ADECQ p.From.Type = obj.TYPE_NONE case p.As == x86.AADDL && p.From.Offset == 1: p.As = x86.AINCL p.From.Type = obj.TYPE_NONE case p.As == x86.AADDL && p.From.Offset == -1: p.As = x86.ADECL p.From.Type = obj.TYPE_NONE } memIdx(&p.To, v) ssagen.AddAux2(&p.To, v, sc.Off64()) case ssa.OpAMD64MOVLQSX, ssa.OpAMD64MOVWQSX, ssa.OpAMD64MOVBQSX, ssa.OpAMD64MOVLQZX, ssa.OpAMD64MOVWQZX, ssa.OpAMD64MOVBQZX, ssa.OpAMD64CVTTSS2SL, ssa.OpAMD64CVTTSD2SL, ssa.OpAMD64CVTTSS2SQ, ssa.OpAMD64CVTTSD2SQ, ssa.OpAMD64CVTSS2SD, ssa.OpAMD64CVTSD2SS: opregreg(s, v.Op.Asm(), v.Reg(), v.Args[0].Reg()) case ssa.OpAMD64CVTSL2SD, ssa.OpAMD64CVTSQ2SD, ssa.OpAMD64CVTSQ2SS, ssa.OpAMD64CVTSL2SS: r := v.Reg() // Break false dependency on destination register. opregreg(s, x86.AXORPS, r, r) opregreg(s, v.Op.Asm(), r, v.Args[0].Reg()) case ssa.OpAMD64MOVQi2f, ssa.OpAMD64MOVQf2i, ssa.OpAMD64MOVLi2f, ssa.OpAMD64MOVLf2i: var p *obj.Prog switch v.Op { case ssa.OpAMD64MOVQi2f, ssa.OpAMD64MOVQf2i: p = s.Prog(x86.AMOVQ) case ssa.OpAMD64MOVLi2f, ssa.OpAMD64MOVLf2i: p = s.Prog(x86.AMOVL) } p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[0].Reg() p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64ADDQload, ssa.OpAMD64ADDLload, ssa.OpAMD64SUBQload, ssa.OpAMD64SUBLload, ssa.OpAMD64ANDQload, ssa.OpAMD64ANDLload, ssa.OpAMD64ORQload, ssa.OpAMD64ORLload, ssa.OpAMD64XORQload, ssa.OpAMD64XORLload, ssa.OpAMD64ADDSDload, ssa.OpAMD64ADDSSload, ssa.OpAMD64SUBSDload, ssa.OpAMD64SUBSSload, ssa.OpAMD64MULSDload, ssa.OpAMD64MULSSload, ssa.OpAMD64DIVSDload, ssa.OpAMD64DIVSSload: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_MEM p.From.Reg = v.Args[1].Reg() ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64ADDLloadidx1, ssa.OpAMD64ADDLloadidx4, ssa.OpAMD64ADDLloadidx8, ssa.OpAMD64ADDQloadidx1, ssa.OpAMD64ADDQloadidx8, ssa.OpAMD64SUBLloadidx1, ssa.OpAMD64SUBLloadidx4, ssa.OpAMD64SUBLloadidx8, ssa.OpAMD64SUBQloadidx1, ssa.OpAMD64SUBQloadidx8, ssa.OpAMD64ANDLloadidx1, ssa.OpAMD64ANDLloadidx4, ssa.OpAMD64ANDLloadidx8, ssa.OpAMD64ANDQloadidx1, ssa.OpAMD64ANDQloadidx8, ssa.OpAMD64ORLloadidx1, ssa.OpAMD64ORLloadidx4, ssa.OpAMD64ORLloadidx8, ssa.OpAMD64ORQloadidx1, ssa.OpAMD64ORQloadidx8, ssa.OpAMD64XORLloadidx1, ssa.OpAMD64XORLloadidx4, ssa.OpAMD64XORLloadidx8, ssa.OpAMD64XORQloadidx1, ssa.OpAMD64XORQloadidx8, ssa.OpAMD64ADDSSloadidx1, ssa.OpAMD64ADDSSloadidx4, ssa.OpAMD64ADDSDloadidx1, ssa.OpAMD64ADDSDloadidx8, ssa.OpAMD64SUBSSloadidx1, ssa.OpAMD64SUBSSloadidx4, ssa.OpAMD64SUBSDloadidx1, ssa.OpAMD64SUBSDloadidx8, ssa.OpAMD64MULSSloadidx1, ssa.OpAMD64MULSSloadidx4, ssa.OpAMD64MULSDloadidx1, ssa.OpAMD64MULSDloadidx8, ssa.OpAMD64DIVSSloadidx1, ssa.OpAMD64DIVSSloadidx4, ssa.OpAMD64DIVSDloadidx1, ssa.OpAMD64DIVSDloadidx8: p := s.Prog(v.Op.Asm()) r, i := v.Args[1].Reg(), v.Args[2].Reg() p.From.Type = obj.TYPE_MEM p.From.Scale = v.Op.Scale() if p.From.Scale == 1 && i == x86.REG_SP { r, i = i, r } p.From.Reg = r p.From.Index = i ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64DUFFZERO: if s.ABI != obj.ABIInternal { // zero X15 manually opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15) } off := duffStart(v.AuxInt) adj := duffAdj(v.AuxInt) var p *obj.Prog if adj != 0 { p = s.Prog(x86.ALEAQ) p.From.Type = obj.TYPE_MEM p.From.Offset = adj p.From.Reg = x86.REG_DI p.To.Type = obj.TYPE_REG p.To.Reg = x86.REG_DI } p = s.Prog(obj.ADUFFZERO) p.To.Type = obj.TYPE_ADDR p.To.Sym = ir.Syms.Duffzero p.To.Offset = off case ssa.OpAMD64DUFFCOPY: p := s.Prog(obj.ADUFFCOPY) p.To.Type = obj.TYPE_ADDR p.To.Sym = ir.Syms.Duffcopy if v.AuxInt%16 != 0 { v.Fatalf("bad DUFFCOPY AuxInt %v", v.AuxInt) } p.To.Offset = 14 * (64 - v.AuxInt/16) // 14 and 64 are magic constants. 14 is the number of bytes to encode: // MOVUPS (SI), X0 // ADDQ $16, SI // MOVUPS X0, (DI) // ADDQ $16, DI // and 64 is the number of such blocks. See src/runtime/duff_amd64.s:duffcopy. case ssa.OpCopy: // TODO: use MOVQreg for reg->reg copies instead of OpCopy? if v.Type.IsMemory() { return } x := v.Args[0].Reg() y := v.Reg() if x != y { opregreg(s, moveByType(v.Type), y, x) } case ssa.OpLoadReg: if v.Type.IsFlags() { v.Fatalf("load flags not implemented: %v", v.LongString()) return } p := s.Prog(loadByType(v.Type)) ssagen.AddrAuto(&p.From, v.Args[0]) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpStoreReg: if v.Type.IsFlags() { v.Fatalf("store flags not implemented: %v", v.LongString()) return } p := s.Prog(storeByType(v.Type)) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[0].Reg() ssagen.AddrAuto(&p.To, v) case ssa.OpAMD64LoweredHasCPUFeature: p := s.Prog(x86.AMOVBQZX) p.From.Type = obj.TYPE_MEM ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpArgIntReg, ssa.OpArgFloatReg: // The assembler needs to wrap the entry safepoint/stack growth code with spill/unspill // The loop only runs once. for _, ap := range v.Block.Func.RegArgs { // Pass the spill/unspill information along to the assembler, offset by size of return PC pushed on stack. addr := ssagen.SpillSlotAddr(ap, x86.REG_SP, v.Block.Func.Config.PtrSize) s.FuncInfo().AddSpill( obj.RegSpill{Reg: ap.Reg, Addr: addr, Unspill: loadByType(ap.Type), Spill: storeByType(ap.Type)}) } v.Block.Func.RegArgs = nil ssagen.CheckArgReg(v) case ssa.OpAMD64LoweredGetClosurePtr: // Closure pointer is DX. ssagen.CheckLoweredGetClosurePtr(v) case ssa.OpAMD64LoweredGetG: if s.ABI == obj.ABIInternal { v.Fatalf("LoweredGetG should not appear in ABIInternal") } r := v.Reg() getgFromTLS(s, r) case ssa.OpAMD64CALLstatic, ssa.OpAMD64CALLtail: if s.ABI == obj.ABI0 && v.Aux.(*ssa.AuxCall).Fn.ABI() == obj.ABIInternal { // zeroing X15 when entering ABIInternal from ABI0 if buildcfg.GOOS != "plan9" { // do not use SSE on Plan 9 opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15) } // set G register from TLS getgFromTLS(s, x86.REG_R14) } if v.Op == ssa.OpAMD64CALLtail { s.TailCall(v) break } s.Call(v) if s.ABI == obj.ABIInternal && v.Aux.(*ssa.AuxCall).Fn.ABI() == obj.ABI0 { // zeroing X15 when entering ABIInternal from ABI0 if buildcfg.GOOS != "plan9" { // do not use SSE on Plan 9 opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15) } // set G register from TLS getgFromTLS(s, x86.REG_R14) } case ssa.OpAMD64CALLclosure, ssa.OpAMD64CALLinter: s.Call(v) case ssa.OpAMD64LoweredGetCallerPC: p := s.Prog(x86.AMOVQ) p.From.Type = obj.TYPE_MEM p.From.Offset = -8 // PC is stored 8 bytes below first parameter. p.From.Name = obj.NAME_PARAM p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64LoweredGetCallerSP: // caller's SP is the address of the first arg mov := x86.AMOVQ if types.PtrSize == 4 { mov = x86.AMOVL } p := s.Prog(mov) p.From.Type = obj.TYPE_ADDR p.From.Offset = -base.Ctxt.FixedFrameSize() // 0 on amd64, just to be consistent with other architectures p.From.Name = obj.NAME_PARAM p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64LoweredWB: p := s.Prog(obj.ACALL) p.To.Type = obj.TYPE_MEM p.To.Name = obj.NAME_EXTERN // arg0 is in DI. Set sym to match where regalloc put arg1. p.To.Sym = ssagen.GCWriteBarrierReg[v.Args[1].Reg()] case ssa.OpAMD64LoweredPanicBoundsA, ssa.OpAMD64LoweredPanicBoundsB, ssa.OpAMD64LoweredPanicBoundsC: p := s.Prog(obj.ACALL) p.To.Type = obj.TYPE_MEM p.To.Name = obj.NAME_EXTERN p.To.Sym = ssagen.BoundsCheckFunc[v.AuxInt] s.UseArgs(int64(2 * types.PtrSize)) // space used in callee args area by assembly stubs case ssa.OpAMD64NEGQ, ssa.OpAMD64NEGL, ssa.OpAMD64BSWAPQ, ssa.OpAMD64BSWAPL, ssa.OpAMD64NOTQ, ssa.OpAMD64NOTL: p := s.Prog(v.Op.Asm()) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64NEGLflags: p := s.Prog(v.Op.Asm()) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg0() case ssa.OpAMD64BSFQ, ssa.OpAMD64BSRQ, ssa.OpAMD64BSFL, ssa.OpAMD64BSRL, ssa.OpAMD64SQRTSD, ssa.OpAMD64SQRTSS: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[0].Reg() p.To.Type = obj.TYPE_REG switch v.Op { case ssa.OpAMD64BSFQ, ssa.OpAMD64BSRQ: p.To.Reg = v.Reg0() case ssa.OpAMD64BSFL, ssa.OpAMD64BSRL, ssa.OpAMD64SQRTSD, ssa.OpAMD64SQRTSS: p.To.Reg = v.Reg() } case ssa.OpAMD64ROUNDSD: p := s.Prog(v.Op.Asm()) val := v.AuxInt // 0 means math.RoundToEven, 1 Floor, 2 Ceil, 3 Trunc if val < 0 || val > 3 { v.Fatalf("Invalid rounding mode") } p.From.Offset = val p.From.Type = obj.TYPE_CONST p.SetFrom3Reg(v.Args[0].Reg()) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64POPCNTQ, ssa.OpAMD64POPCNTL: if v.Args[0].Reg() != v.Reg() { // POPCNT on Intel has a false dependency on the destination register. // Xor register with itself to break the dependency. p := s.Prog(x86.AXORL) p.From.Type = obj.TYPE_REG p.From.Reg = v.Reg() p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() } p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[0].Reg() p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64SETEQ, ssa.OpAMD64SETNE, ssa.OpAMD64SETL, ssa.OpAMD64SETLE, ssa.OpAMD64SETG, ssa.OpAMD64SETGE, ssa.OpAMD64SETGF, ssa.OpAMD64SETGEF, ssa.OpAMD64SETB, ssa.OpAMD64SETBE, ssa.OpAMD64SETORD, ssa.OpAMD64SETNAN, ssa.OpAMD64SETA, ssa.OpAMD64SETAE, ssa.OpAMD64SETO: p := s.Prog(v.Op.Asm()) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() case ssa.OpAMD64SETEQstore, ssa.OpAMD64SETNEstore, ssa.OpAMD64SETLstore, ssa.OpAMD64SETLEstore, ssa.OpAMD64SETGstore, ssa.OpAMD64SETGEstore, ssa.OpAMD64SETBstore, ssa.OpAMD64SETBEstore, ssa.OpAMD64SETAstore, ssa.OpAMD64SETAEstore: p := s.Prog(v.Op.Asm()) p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() ssagen.AddAux(&p.To, v) case ssa.OpAMD64SETNEF: p := s.Prog(v.Op.Asm()) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() q := s.Prog(x86.ASETPS) q.To.Type = obj.TYPE_REG q.To.Reg = x86.REG_AX // ORL avoids partial register write and is smaller than ORQ, used by old compiler opregreg(s, x86.AORL, v.Reg(), x86.REG_AX) case ssa.OpAMD64SETEQF: p := s.Prog(v.Op.Asm()) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() q := s.Prog(x86.ASETPC) q.To.Type = obj.TYPE_REG q.To.Reg = x86.REG_AX // ANDL avoids partial register write and is smaller than ANDQ, used by old compiler opregreg(s, x86.AANDL, v.Reg(), x86.REG_AX) case ssa.OpAMD64InvertFlags: v.Fatalf("InvertFlags should never make it to codegen %v", v.LongString()) case ssa.OpAMD64FlagEQ, ssa.OpAMD64FlagLT_ULT, ssa.OpAMD64FlagLT_UGT, ssa.OpAMD64FlagGT_ULT, ssa.OpAMD64FlagGT_UGT: v.Fatalf("Flag* ops should never make it to codegen %v", v.LongString()) case ssa.OpAMD64AddTupleFirst32, ssa.OpAMD64AddTupleFirst64: v.Fatalf("AddTupleFirst* should never make it to codegen %v", v.LongString()) case ssa.OpAMD64REPSTOSQ: s.Prog(x86.AREP) s.Prog(x86.ASTOSQ) case ssa.OpAMD64REPMOVSQ: s.Prog(x86.AREP) s.Prog(x86.AMOVSQ) case ssa.OpAMD64LoweredNilCheck: // 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 := s.Prog(x86.ATESTB) p.From.Type = obj.TYPE_REG p.From.Reg = x86.REG_AX p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() if logopt.Enabled() { logopt.LogOpt(v.Pos, "nilcheck", "genssa", v.Block.Func.Name) } if base.Debug.Nil != 0 && v.Pos.Line() > 1 { // v.Pos.Line()==1 in generated wrappers base.WarnfAt(v.Pos, "generated nil check") } case ssa.OpAMD64MOVBatomicload, ssa.OpAMD64MOVLatomicload, ssa.OpAMD64MOVQatomicload: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_MEM p.From.Reg = v.Args[0].Reg() ssagen.AddAux(&p.From, v) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg0() case ssa.OpAMD64XCHGB, ssa.OpAMD64XCHGL, ssa.OpAMD64XCHGQ: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Reg0() p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[1].Reg() ssagen.AddAux(&p.To, v) case ssa.OpAMD64XADDLlock, ssa.OpAMD64XADDQlock: s.Prog(x86.ALOCK) p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Reg0() p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[1].Reg() ssagen.AddAux(&p.To, v) case ssa.OpAMD64CMPXCHGLlock, ssa.OpAMD64CMPXCHGQlock: if v.Args[1].Reg() != x86.REG_AX { v.Fatalf("input[1] not in AX %s", v.LongString()) } s.Prog(x86.ALOCK) p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[2].Reg() p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() ssagen.AddAux(&p.To, v) p = s.Prog(x86.ASETEQ) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg0() case ssa.OpAMD64ANDBlock, ssa.OpAMD64ANDLlock, ssa.OpAMD64ORBlock, ssa.OpAMD64ORLlock: s.Prog(x86.ALOCK) p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_REG p.From.Reg = v.Args[1].Reg() p.To.Type = obj.TYPE_MEM p.To.Reg = v.Args[0].Reg() ssagen.AddAux(&p.To, v) case ssa.OpAMD64PrefetchT0, ssa.OpAMD64PrefetchNTA: p := s.Prog(v.Op.Asm()) p.From.Type = obj.TYPE_MEM p.From.Reg = v.Args[0].Reg() case ssa.OpClobber: p := s.Prog(x86.AMOVL) p.From.Type = obj.TYPE_CONST p.From.Offset = 0xdeaddead p.To.Type = obj.TYPE_MEM p.To.Reg = x86.REG_SP ssagen.AddAux(&p.To, v) p = s.Prog(x86.AMOVL) p.From.Type = obj.TYPE_CONST p.From.Offset = 0xdeaddead p.To.Type = obj.TYPE_MEM p.To.Reg = x86.REG_SP ssagen.AddAux(&p.To, v) p.To.Offset += 4 case ssa.OpClobberReg: x := uint64(0xdeaddeaddeaddead) p := s.Prog(x86.AMOVQ) p.From.Type = obj.TYPE_CONST p.From.Offset = int64(x) p.To.Type = obj.TYPE_REG p.To.Reg = v.Reg() default: v.Fatalf("genValue not implemented: %s", v.LongString()) } } var blockJump = [...]struct { asm, invasm obj.As }{ ssa.BlockAMD64EQ: {x86.AJEQ, x86.AJNE}, ssa.BlockAMD64NE: {x86.AJNE, x86.AJEQ}, ssa.BlockAMD64LT: {x86.AJLT, x86.AJGE}, ssa.BlockAMD64GE: {x86.AJGE, x86.AJLT}, ssa.BlockAMD64LE: {x86.AJLE, x86.AJGT}, ssa.BlockAMD64GT: {x86.AJGT, x86.AJLE}, ssa.BlockAMD64OS: {x86.AJOS, x86.AJOC}, ssa.BlockAMD64OC: {x86.AJOC, x86.AJOS}, ssa.BlockAMD64ULT: {x86.AJCS, x86.AJCC}, ssa.BlockAMD64UGE: {x86.AJCC, x86.AJCS}, ssa.BlockAMD64UGT: {x86.AJHI, x86.AJLS}, ssa.BlockAMD64ULE: {x86.AJLS, x86.AJHI}, ssa.BlockAMD64ORD: {x86.AJPC, x86.AJPS}, ssa.BlockAMD64NAN: {x86.AJPS, x86.AJPC}, } var eqfJumps = [2][2]ssagen.IndexJump{ {{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]ssagen.IndexJump{ {{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 *ssagen.State, b, next *ssa.Block) { switch b.Kind { case ssa.BlockPlain: if b.Succs[0].Block() != next { p := s.Prog(obj.AJMP) p.To.Type = obj.TYPE_BRANCH s.Branches = append(s.Branches, ssagen.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 := s.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 = s.Prog(x86.AJNE) p.To.Type = obj.TYPE_BRANCH s.Branches = append(s.Branches, ssagen.Branch{P: p, B: b.Succs[1].Block()}) if b.Succs[0].Block() != next { p := s.Prog(obj.AJMP) p.To.Type = obj.TYPE_BRANCH s.Branches = append(s.Branches, ssagen.Branch{P: p, B: b.Succs[0].Block()}) } case ssa.BlockExit, ssa.BlockRetJmp: case ssa.BlockRet: s.Prog(obj.ARET) case ssa.BlockAMD64EQF: s.CombJump(b, next, &eqfJumps) case ssa.BlockAMD64NEF: s.CombJump(b, next, &nefJumps) case ssa.BlockAMD64EQ, ssa.BlockAMD64NE, ssa.BlockAMD64LT, ssa.BlockAMD64GE, ssa.BlockAMD64LE, ssa.BlockAMD64GT, ssa.BlockAMD64OS, ssa.BlockAMD64OC, ssa.BlockAMD64ULT, ssa.BlockAMD64UGT, ssa.BlockAMD64ULE, ssa.BlockAMD64UGE: jmp := blockJump[b.Kind] switch next { case b.Succs[0].Block(): s.Br(jmp.invasm, b.Succs[1].Block()) case b.Succs[1].Block(): s.Br(jmp.asm, b.Succs[0].Block()) default: if b.Likely != ssa.BranchUnlikely { s.Br(jmp.asm, b.Succs[0].Block()) s.Br(obj.AJMP, b.Succs[1].Block()) } else { s.Br(jmp.invasm, b.Succs[1].Block()) s.Br(obj.AJMP, b.Succs[0].Block()) } } default: b.Fatalf("branch not implemented: %s", b.LongString()) } } func loadRegResult(s *ssagen.State, f *ssa.Func, t *types.Type, reg int16, n *ir.Name, off int64) *obj.Prog { p := s.Prog(loadByType(t)) p.From.Type = obj.TYPE_MEM p.From.Name = obj.NAME_AUTO p.From.Sym = n.Linksym() p.From.Offset = n.FrameOffset() + off p.To.Type = obj.TYPE_REG p.To.Reg = reg return p } func spillArgReg(pp *objw.Progs, p *obj.Prog, f *ssa.Func, t *types.Type, reg int16, n *ir.Name, off int64) *obj.Prog { p = pp.Append(p, storeByType(t), obj.TYPE_REG, reg, 0, obj.TYPE_MEM, 0, n.FrameOffset()+off) p.To.Name = obj.NAME_PARAM p.To.Sym = n.Linksym() p.Pos = p.Pos.WithNotStmt() return p }