forked from golang/go
/
ssa.go
1210 lines (1101 loc) · 31.7 KB
/
ssa.go
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// 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 ppc64
import (
"cmd/compile/internal/gc"
"cmd/compile/internal/ssa"
"cmd/compile/internal/types"
"cmd/internal/obj"
"cmd/internal/obj/ppc64"
"math"
)
// iselOp encodes mapping of comparison operations onto ISEL operands
type iselOp struct {
cond int64
valueIfCond int // if cond is true, the value to return (0 or 1)
}
// Input registers to ISEL used for comparison. Index 0 is zero, 1 is (will be) 1
var iselRegs = [2]int16{ppc64.REG_R0, ppc64.REGTMP}
var iselOps = map[ssa.Op]iselOp{
ssa.OpPPC64Equal: iselOp{cond: ppc64.C_COND_EQ, valueIfCond: 1},
ssa.OpPPC64NotEqual: iselOp{cond: ppc64.C_COND_EQ, valueIfCond: 0},
ssa.OpPPC64LessThan: iselOp{cond: ppc64.C_COND_LT, valueIfCond: 1},
ssa.OpPPC64GreaterEqual: iselOp{cond: ppc64.C_COND_LT, valueIfCond: 0},
ssa.OpPPC64GreaterThan: iselOp{cond: ppc64.C_COND_GT, valueIfCond: 1},
ssa.OpPPC64LessEqual: iselOp{cond: ppc64.C_COND_GT, valueIfCond: 0},
ssa.OpPPC64FLessThan: iselOp{cond: ppc64.C_COND_LT, valueIfCond: 1},
ssa.OpPPC64FGreaterThan: iselOp{cond: ppc64.C_COND_GT, valueIfCond: 1},
ssa.OpPPC64FLessEqual: iselOp{cond: ppc64.C_COND_LT, valueIfCond: 1}, // 2 comparisons, 2nd is EQ
ssa.OpPPC64FGreaterEqual: iselOp{cond: ppc64.C_COND_GT, valueIfCond: 1}, // 2 comparisons, 2nd is EQ
}
// 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 == v.Op == ssa.OpPPC64MOVDconst) {
// // 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 {
if t.IsFloat() {
switch t.Size() {
case 4:
return ppc64.AFMOVS
case 8:
return ppc64.AFMOVD
}
} else {
switch t.Size() {
case 1:
if t.IsSigned() {
return ppc64.AMOVB
} else {
return ppc64.AMOVBZ
}
case 2:
if t.IsSigned() {
return ppc64.AMOVH
} else {
return ppc64.AMOVHZ
}
case 4:
if t.IsSigned() {
return ppc64.AMOVW
} else {
return ppc64.AMOVWZ
}
case 8:
return ppc64.AMOVD
}
}
panic("bad load type")
}
// storeByType returns the store instruction of the given type.
func storeByType(t *types.Type) obj.As {
if t.IsFloat() {
switch t.Size() {
case 4:
return ppc64.AFMOVS
case 8:
return ppc64.AFMOVD
}
} else {
switch t.Size() {
case 1:
return ppc64.AMOVB
case 2:
return ppc64.AMOVH
case 4:
return ppc64.AMOVW
case 8:
return ppc64.AMOVD
}
}
panic("bad store type")
}
func ssaGenISEL(s *gc.SSAGenState, v *ssa.Value, cr int64, r1, r2 int16) {
r := v.Reg()
p := s.Prog(ppc64.AISEL)
p.To.Type = obj.TYPE_REG
p.To.Reg = r
p.Reg = r1
p.SetFrom3(obj.Addr{Type: obj.TYPE_REG, Reg: r2})
p.From.Type = obj.TYPE_CONST
p.From.Offset = cr
}
func ssaGenValue(s *gc.SSAGenState, v *ssa.Value) {
switch v.Op {
case ssa.OpCopy, ssa.OpPPC64MOVDconvert:
t := v.Type
if t.IsMemory() {
return
}
x := v.Args[0].Reg()
y := v.Reg()
if x != y {
rt := obj.TYPE_REG
op := ppc64.AMOVD
if t.IsFloat() {
op = ppc64.AFMOVD
}
p := s.Prog(op)
p.From.Type = rt
p.From.Reg = x
p.To.Type = rt
p.To.Reg = y
}
case ssa.OpPPC64LoweredAtomicAnd8,
ssa.OpPPC64LoweredAtomicOr8:
// LWSYNC
// LBAR (Rarg0), Rtmp
// AND/OR Rarg1, Rtmp
// STBCCC Rtmp, (Rarg0)
// BNE -3(PC)
r0 := v.Args[0].Reg()
r1 := v.Args[1].Reg()
// LWSYNC - Assuming shared data not write-through-required nor
// caching-inhibited. See Appendix B.2.2.2 in the ISA 2.07b.
plwsync := s.Prog(ppc64.ALWSYNC)
plwsync.To.Type = obj.TYPE_NONE
p := s.Prog(ppc64.ALBAR)
p.From.Type = obj.TYPE_MEM
p.From.Reg = r0
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REGTMP
p1 := s.Prog(v.Op.Asm())
p1.From.Type = obj.TYPE_REG
p1.From.Reg = r1
p1.To.Type = obj.TYPE_REG
p1.To.Reg = ppc64.REGTMP
p2 := s.Prog(ppc64.ASTBCCC)
p2.From.Type = obj.TYPE_REG
p2.From.Reg = ppc64.REGTMP
p2.To.Type = obj.TYPE_MEM
p2.To.Reg = r0
p2.RegTo2 = ppc64.REGTMP
p3 := s.Prog(ppc64.ABNE)
p3.To.Type = obj.TYPE_BRANCH
gc.Patch(p3, p)
case ssa.OpPPC64LoweredAtomicAdd32,
ssa.OpPPC64LoweredAtomicAdd64:
// LWSYNC
// LDAR/LWAR (Rarg0), Rout
// ADD Rarg1, Rout
// STDCCC/STWCCC Rout, (Rarg0)
// BNE -3(PC)
// MOVW Rout,Rout (if Add32)
ld := ppc64.ALDAR
st := ppc64.ASTDCCC
if v.Op == ssa.OpPPC64LoweredAtomicAdd32 {
ld = ppc64.ALWAR
st = ppc64.ASTWCCC
}
r0 := v.Args[0].Reg()
r1 := v.Args[1].Reg()
out := v.Reg0()
// LWSYNC - Assuming shared data not write-through-required nor
// caching-inhibited. See Appendix B.2.2.2 in the ISA 2.07b.
plwsync := s.Prog(ppc64.ALWSYNC)
plwsync.To.Type = obj.TYPE_NONE
// LDAR or LWAR
p := s.Prog(ld)
p.From.Type = obj.TYPE_MEM
p.From.Reg = r0
p.To.Type = obj.TYPE_REG
p.To.Reg = out
// ADD reg1,out
p1 := s.Prog(ppc64.AADD)
p1.From.Type = obj.TYPE_REG
p1.From.Reg = r1
p1.To.Reg = out
p1.To.Type = obj.TYPE_REG
// STDCCC or STWCCC
p3 := s.Prog(st)
p3.From.Type = obj.TYPE_REG
p3.From.Reg = out
p3.To.Type = obj.TYPE_MEM
p3.To.Reg = r0
// BNE retry
p4 := s.Prog(ppc64.ABNE)
p4.To.Type = obj.TYPE_BRANCH
gc.Patch(p4, p)
// Ensure a 32 bit result
if v.Op == ssa.OpPPC64LoweredAtomicAdd32 {
p5 := s.Prog(ppc64.AMOVWZ)
p5.To.Type = obj.TYPE_REG
p5.To.Reg = out
p5.From.Type = obj.TYPE_REG
p5.From.Reg = out
}
case ssa.OpPPC64LoweredAtomicExchange32,
ssa.OpPPC64LoweredAtomicExchange64:
// LWSYNC
// LDAR/LWAR (Rarg0), Rout
// STDCCC/STWCCC Rout, (Rarg0)
// BNE -2(PC)
// ISYNC
ld := ppc64.ALDAR
st := ppc64.ASTDCCC
if v.Op == ssa.OpPPC64LoweredAtomicExchange32 {
ld = ppc64.ALWAR
st = ppc64.ASTWCCC
}
r0 := v.Args[0].Reg()
r1 := v.Args[1].Reg()
out := v.Reg0()
// LWSYNC - Assuming shared data not write-through-required nor
// caching-inhibited. See Appendix B.2.2.2 in the ISA 2.07b.
plwsync := s.Prog(ppc64.ALWSYNC)
plwsync.To.Type = obj.TYPE_NONE
// LDAR or LWAR
p := s.Prog(ld)
p.From.Type = obj.TYPE_MEM
p.From.Reg = r0
p.To.Type = obj.TYPE_REG
p.To.Reg = out
// STDCCC or STWCCC
p1 := s.Prog(st)
p1.From.Type = obj.TYPE_REG
p1.From.Reg = r1
p1.To.Type = obj.TYPE_MEM
p1.To.Reg = r0
// BNE retry
p2 := s.Prog(ppc64.ABNE)
p2.To.Type = obj.TYPE_BRANCH
gc.Patch(p2, p)
// ISYNC
pisync := s.Prog(ppc64.AISYNC)
pisync.To.Type = obj.TYPE_NONE
case ssa.OpPPC64LoweredAtomicLoad32,
ssa.OpPPC64LoweredAtomicLoad64,
ssa.OpPPC64LoweredAtomicLoadPtr:
// SYNC
// MOVD/MOVW (Rarg0), Rout
// CMP Rout,Rout
// BNE 1(PC)
// ISYNC
ld := ppc64.AMOVD
cmp := ppc64.ACMP
if v.Op == ssa.OpPPC64LoweredAtomicLoad32 {
ld = ppc64.AMOVW
cmp = ppc64.ACMPW
}
arg0 := v.Args[0].Reg()
out := v.Reg0()
// SYNC
psync := s.Prog(ppc64.ASYNC)
psync.To.Type = obj.TYPE_NONE
// Load
p := s.Prog(ld)
p.From.Type = obj.TYPE_MEM
p.From.Reg = arg0
p.To.Type = obj.TYPE_REG
p.To.Reg = out
// CMP
p1 := s.Prog(cmp)
p1.From.Type = obj.TYPE_REG
p1.From.Reg = out
p1.To.Type = obj.TYPE_REG
p1.To.Reg = out
// BNE
p2 := s.Prog(ppc64.ABNE)
p2.To.Type = obj.TYPE_BRANCH
// ISYNC
pisync := s.Prog(ppc64.AISYNC)
pisync.To.Type = obj.TYPE_NONE
gc.Patch(p2, pisync)
case ssa.OpPPC64LoweredAtomicStore32,
ssa.OpPPC64LoweredAtomicStore64:
// SYNC
// MOVD/MOVW arg1,(arg0)
st := ppc64.AMOVD
if v.Op == ssa.OpPPC64LoweredAtomicStore32 {
st = ppc64.AMOVW
}
arg0 := v.Args[0].Reg()
arg1 := v.Args[1].Reg()
// SYNC
psync := s.Prog(ppc64.ASYNC)
psync.To.Type = obj.TYPE_NONE
// Store
p := s.Prog(st)
p.To.Type = obj.TYPE_MEM
p.To.Reg = arg0
p.From.Type = obj.TYPE_REG
p.From.Reg = arg1
case ssa.OpPPC64LoweredAtomicCas64,
ssa.OpPPC64LoweredAtomicCas32:
// LWSYNC
// loop:
// LDAR (Rarg0), Rtmp
// CMP Rarg1, Rtmp
// BNE fail
// STDCCC Rarg2, (Rarg0)
// BNE loop
// LWSYNC
// MOVD $1, Rout
// BR end
// fail:
// MOVD $0, Rout
// end:
ld := ppc64.ALDAR
st := ppc64.ASTDCCC
cmp := ppc64.ACMP
if v.Op == ssa.OpPPC64LoweredAtomicCas32 {
ld = ppc64.ALWAR
st = ppc64.ASTWCCC
cmp = ppc64.ACMPW
}
r0 := v.Args[0].Reg()
r1 := v.Args[1].Reg()
r2 := v.Args[2].Reg()
out := v.Reg0()
// LWSYNC - Assuming shared data not write-through-required nor
// caching-inhibited. See Appendix B.2.2.2 in the ISA 2.07b.
plwsync1 := s.Prog(ppc64.ALWSYNC)
plwsync1.To.Type = obj.TYPE_NONE
// LDAR or LWAR
p := s.Prog(ld)
p.From.Type = obj.TYPE_MEM
p.From.Reg = r0
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REGTMP
// CMP reg1,reg2
p1 := s.Prog(cmp)
p1.From.Type = obj.TYPE_REG
p1.From.Reg = r1
p1.To.Reg = ppc64.REGTMP
p1.To.Type = obj.TYPE_REG
// BNE cas_fail
p2 := s.Prog(ppc64.ABNE)
p2.To.Type = obj.TYPE_BRANCH
// STDCCC or STWCCC
p3 := s.Prog(st)
p3.From.Type = obj.TYPE_REG
p3.From.Reg = r2
p3.To.Type = obj.TYPE_MEM
p3.To.Reg = r0
// BNE retry
p4 := s.Prog(ppc64.ABNE)
p4.To.Type = obj.TYPE_BRANCH
gc.Patch(p4, p)
// LWSYNC - Assuming shared data not write-through-required nor
// caching-inhibited. See Appendix B.2.1.1 in the ISA 2.07b.
plwsync2 := s.Prog(ppc64.ALWSYNC)
plwsync2.To.Type = obj.TYPE_NONE
// return true
p5 := s.Prog(ppc64.AMOVD)
p5.From.Type = obj.TYPE_CONST
p5.From.Offset = 1
p5.To.Type = obj.TYPE_REG
p5.To.Reg = out
// BR done
p6 := s.Prog(obj.AJMP)
p6.To.Type = obj.TYPE_BRANCH
// return false
p7 := s.Prog(ppc64.AMOVD)
p7.From.Type = obj.TYPE_CONST
p7.From.Offset = 0
p7.To.Type = obj.TYPE_REG
p7.To.Reg = out
gc.Patch(p2, p7)
// done (label)
p8 := s.Prog(obj.ANOP)
gc.Patch(p6, p8)
case ssa.OpPPC64LoweredGetClosurePtr:
// Closure pointer is R11 (already)
gc.CheckLoweredGetClosurePtr(v)
case ssa.OpPPC64LoweredGetCallerSP:
// caller's SP is FixedFrameSize below the address of the first arg
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_ADDR
p.From.Offset = -gc.Ctxt.FixedFrameSize()
p.From.Name = obj.NAME_PARAM
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpPPC64LoweredRound32F, ssa.OpPPC64LoweredRound64F:
// input is already rounded
case ssa.OpLoadReg:
loadOp := loadByType(v.Type)
p := s.Prog(loadOp)
gc.AddrAuto(&p.From, v.Args[0])
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpStoreReg:
storeOp := storeByType(v.Type)
p := s.Prog(storeOp)
p.From.Type = obj.TYPE_REG
p.From.Reg = v.Args[0].Reg()
gc.AddrAuto(&p.To, v)
case ssa.OpPPC64DIVD:
// For now,
//
// cmp arg1, -1
// be ahead
// v = arg0 / arg1
// b over
// ahead: v = - arg0
// over: nop
r := v.Reg()
r0 := v.Args[0].Reg()
r1 := v.Args[1].Reg()
p := s.Prog(ppc64.ACMP)
p.From.Type = obj.TYPE_REG
p.From.Reg = r1
p.To.Type = obj.TYPE_CONST
p.To.Offset = -1
pbahead := s.Prog(ppc64.ABEQ)
pbahead.To.Type = obj.TYPE_BRANCH
p = s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = r1
p.Reg = r0
p.To.Type = obj.TYPE_REG
p.To.Reg = r
pbover := s.Prog(obj.AJMP)
pbover.To.Type = obj.TYPE_BRANCH
p = s.Prog(ppc64.ANEG)
p.To.Type = obj.TYPE_REG
p.To.Reg = r
p.From.Type = obj.TYPE_REG
p.From.Reg = r0
gc.Patch(pbahead, p)
p = s.Prog(obj.ANOP)
gc.Patch(pbover, p)
case ssa.OpPPC64DIVW:
// word-width version of above
r := v.Reg()
r0 := v.Args[0].Reg()
r1 := v.Args[1].Reg()
p := s.Prog(ppc64.ACMPW)
p.From.Type = obj.TYPE_REG
p.From.Reg = r1
p.To.Type = obj.TYPE_CONST
p.To.Offset = -1
pbahead := s.Prog(ppc64.ABEQ)
pbahead.To.Type = obj.TYPE_BRANCH
p = s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = r1
p.Reg = r0
p.To.Type = obj.TYPE_REG
p.To.Reg = r
pbover := s.Prog(obj.AJMP)
pbover.To.Type = obj.TYPE_BRANCH
p = s.Prog(ppc64.ANEG)
p.To.Type = obj.TYPE_REG
p.To.Reg = r
p.From.Type = obj.TYPE_REG
p.From.Reg = r0
gc.Patch(pbahead, p)
p = s.Prog(obj.ANOP)
gc.Patch(pbover, p)
case ssa.OpPPC64ADD, ssa.OpPPC64FADD, ssa.OpPPC64FADDS, ssa.OpPPC64SUB, ssa.OpPPC64FSUB, ssa.OpPPC64FSUBS,
ssa.OpPPC64MULLD, ssa.OpPPC64MULLW, ssa.OpPPC64DIVDU, ssa.OpPPC64DIVWU,
ssa.OpPPC64SRAD, ssa.OpPPC64SRAW, ssa.OpPPC64SRD, ssa.OpPPC64SRW, ssa.OpPPC64SLD, ssa.OpPPC64SLW,
ssa.OpPPC64ROTL, ssa.OpPPC64ROTLW,
ssa.OpPPC64MULHD, ssa.OpPPC64MULHW, ssa.OpPPC64MULHDU, ssa.OpPPC64MULHWU,
ssa.OpPPC64FMUL, ssa.OpPPC64FMULS, ssa.OpPPC64FDIV, ssa.OpPPC64FDIVS, ssa.OpPPC64FCPSGN,
ssa.OpPPC64AND, ssa.OpPPC64OR, ssa.OpPPC64ANDN, ssa.OpPPC64ORN, ssa.OpPPC64NOR, ssa.OpPPC64XOR, ssa.OpPPC64EQV:
r := v.Reg()
r1 := v.Args[0].Reg()
r2 := v.Args[1].Reg()
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = r2
p.Reg = r1
p.To.Type = obj.TYPE_REG
p.To.Reg = r
case ssa.OpPPC64ROTLconst, ssa.OpPPC64ROTLWconst:
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt
p.Reg = v.Args[0].Reg()
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpPPC64FMADD, ssa.OpPPC64FMADDS, ssa.OpPPC64FMSUB, ssa.OpPPC64FMSUBS:
r := v.Reg()
r1 := v.Args[0].Reg()
r2 := v.Args[1].Reg()
r3 := v.Args[2].Reg()
// r = r1*r2 ± r3
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = r1
p.Reg = r3
p.SetFrom3(obj.Addr{Type: obj.TYPE_REG, Reg: r2})
p.To.Type = obj.TYPE_REG
p.To.Reg = r
case ssa.OpPPC64MaskIfNotCarry:
r := v.Reg()
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = ppc64.REGZERO
p.To.Type = obj.TYPE_REG
p.To.Reg = r
case ssa.OpPPC64ADDconstForCarry:
r1 := v.Args[0].Reg()
p := s.Prog(v.Op.Asm())
p.Reg = r1
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REGTMP // Ignored; this is for the carry effect.
case ssa.OpPPC64NEG, ssa.OpPPC64FNEG, ssa.OpPPC64FSQRT, ssa.OpPPC64FSQRTS, ssa.OpPPC64FFLOOR, ssa.OpPPC64FTRUNC, ssa.OpPPC64FCEIL, ssa.OpPPC64FCTIDZ, ssa.OpPPC64FCTIWZ, ssa.OpPPC64FCFID, ssa.OpPPC64FCFIDS, ssa.OpPPC64FRSP, ssa.OpPPC64CNTLZD, ssa.OpPPC64CNTLZW, ssa.OpPPC64POPCNTD, ssa.OpPPC64POPCNTW, ssa.OpPPC64POPCNTB, ssa.OpPPC64MFVSRD, ssa.OpPPC64MTVSRD, ssa.OpPPC64FABS, ssa.OpPPC64FNABS:
r := v.Reg()
p := s.Prog(v.Op.Asm())
p.To.Type = obj.TYPE_REG
p.To.Reg = r
p.From.Type = obj.TYPE_REG
p.From.Reg = v.Args[0].Reg()
case ssa.OpPPC64ADDconst, ssa.OpPPC64ANDconst, ssa.OpPPC64ORconst, ssa.OpPPC64XORconst,
ssa.OpPPC64SRADconst, ssa.OpPPC64SRAWconst, ssa.OpPPC64SRDconst, ssa.OpPPC64SRWconst, ssa.OpPPC64SLDconst, ssa.OpPPC64SLWconst:
p := s.Prog(v.Op.Asm())
p.Reg = v.Args[0].Reg()
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpPPC64ANDCCconst:
p := s.Prog(v.Op.Asm())
p.Reg = v.Args[0].Reg()
if v.Aux != nil {
p.From.Type = obj.TYPE_CONST
p.From.Offset = gc.AuxOffset(v)
} else {
p.From.Type = obj.TYPE_CONST
p.From.Offset = v.AuxInt
}
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REGTMP // discard result
case ssa.OpPPC64MOVDaddr:
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_ADDR
p.From.Reg = v.Args[0].Reg()
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
var wantreg string
// Suspect comment, copied from ARM code
// MOVD $sym+off(base), R
// the assembler expands it as the following:
// - base is SP: add constant offset to SP
// when constant is large, tmp register (R11) may be used
// - base is SB: load external address from constant pool (use relocation)
switch v.Aux.(type) {
default:
v.Fatalf("aux is of unknown type %T", v.Aux)
case *obj.LSym:
wantreg = "SB"
gc.AddAux(&p.From, v)
case *gc.Node:
wantreg = "SP"
gc.AddAux(&p.From, v)
case nil:
// No sym, just MOVD $off(SP), R
wantreg = "SP"
p.From.Offset = v.AuxInt
}
if reg := v.Args[0].RegName(); reg != wantreg {
v.Fatalf("bad reg %s for symbol type %T, want %s", reg, v.Aux, wantreg)
}
case ssa.OpPPC64MOVDconst:
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.OpPPC64FMOVDconst, ssa.OpPPC64FMOVSconst:
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 = v.Reg()
case ssa.OpPPC64FCMPU, ssa.OpPPC64CMP, ssa.OpPPC64CMPW, ssa.OpPPC64CMPU, ssa.OpPPC64CMPWU:
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.Args[1].Reg()
case ssa.OpPPC64CMPconst, ssa.OpPPC64CMPUconst, ssa.OpPPC64CMPWconst, ssa.OpPPC64CMPWUconst:
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.OpPPC64MOVBreg, ssa.OpPPC64MOVBZreg, ssa.OpPPC64MOVHreg, ssa.OpPPC64MOVHZreg, ssa.OpPPC64MOVWreg, ssa.OpPPC64MOVWZreg:
// Shift in register to required size
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = v.Args[0].Reg()
p.To.Reg = v.Reg()
p.To.Type = obj.TYPE_REG
case ssa.OpPPC64MOVDload, ssa.OpPPC64MOVWload, ssa.OpPPC64MOVHload, ssa.OpPPC64MOVWZload, ssa.OpPPC64MOVBZload, ssa.OpPPC64MOVHZload:
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_MEM
p.From.Reg = v.Args[0].Reg()
gc.AddAux(&p.From, v)
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpPPC64FMOVDload, ssa.OpPPC64FMOVSload:
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_MEM
p.From.Reg = v.Args[0].Reg()
gc.AddAux(&p.From, v)
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpPPC64MOVDstorezero, ssa.OpPPC64MOVWstorezero, ssa.OpPPC64MOVHstorezero, ssa.OpPPC64MOVBstorezero:
p := s.Prog(v.Op.Asm())
p.From.Type = obj.TYPE_REG
p.From.Reg = ppc64.REGZERO
p.To.Type = obj.TYPE_MEM
p.To.Reg = v.Args[0].Reg()
gc.AddAux(&p.To, v)
case ssa.OpPPC64MOVDstore, ssa.OpPPC64MOVWstore, ssa.OpPPC64MOVHstore, ssa.OpPPC64MOVBstore:
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()
gc.AddAux(&p.To, v)
case ssa.OpPPC64FMOVDstore, ssa.OpPPC64FMOVSstore:
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()
gc.AddAux(&p.To, v)
case ssa.OpPPC64Equal,
ssa.OpPPC64NotEqual,
ssa.OpPPC64LessThan,
ssa.OpPPC64FLessThan,
ssa.OpPPC64LessEqual,
ssa.OpPPC64GreaterThan,
ssa.OpPPC64FGreaterThan,
ssa.OpPPC64GreaterEqual:
// On Power7 or later, can use isel instruction:
// for a < b, a > b, a = b:
// rtmp := 1
// isel rt,rtmp,r0,cond // rt is target in ppc asm
// for a >= b, a <= b, a != b:
// rtmp := 1
// isel rt,0,rtmp,!cond // rt is target in ppc asm
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_CONST
p.From.Offset = 1
p.To.Type = obj.TYPE_REG
p.To.Reg = iselRegs[1]
iop := iselOps[v.Op]
ssaGenISEL(s, v, iop.cond, iselRegs[iop.valueIfCond], iselRegs[1-iop.valueIfCond])
case ssa.OpPPC64FLessEqual, // These include a second branch for EQ -- dealing with NaN prevents REL= to !REL conversion
ssa.OpPPC64FGreaterEqual:
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_CONST
p.From.Offset = 1
p.To.Type = obj.TYPE_REG
p.To.Reg = iselRegs[1]
iop := iselOps[v.Op]
ssaGenISEL(s, v, iop.cond, iselRegs[iop.valueIfCond], iselRegs[1-iop.valueIfCond])
ssaGenISEL(s, v, ppc64.C_COND_EQ, iselRegs[1], v.Reg())
case ssa.OpPPC64LoweredZero:
// unaligned data doesn't hurt performance
// for these instructions on power8 or later
// for sizes >= 64 generate a loop as follows:
// set up loop counter in CTR, used by BC
// MOVD len/32,REG_TMP
// MOVD REG_TMP,CTR
// loop:
// MOVD R0,(R3)
// MOVD R0,8(R3)
// MOVD R0,16(R3)
// MOVD R0,24(R3)
// ADD $32,R3
// BC 16, 0, loop
//
// any remainder is done as described below
// for sizes < 64 bytes, first clear as many doublewords as possible,
// then handle the remainder
// MOVD R0,(R3)
// MOVD R0,8(R3)
// .... etc.
//
// the remainder bytes are cleared using one or more
// of the following instructions with the appropriate
// offsets depending which instructions are needed
//
// MOVW R0,n1(R3) 4 bytes
// MOVH R0,n2(R3) 2 bytes
// MOVB R0,n3(R3) 1 byte
//
// 7 bytes: MOVW, MOVH, MOVB
// 6 bytes: MOVW, MOVH
// 5 bytes: MOVW, MOVB
// 3 bytes: MOVH, MOVB
// each loop iteration does 32 bytes
ctr := v.AuxInt / 32
// remainder bytes
rem := v.AuxInt % 32
// only generate a loop if there is more
// than 1 iteration.
if ctr > 1 {
// Set up CTR loop counter
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_CONST
p.From.Offset = ctr
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REGTMP
p = s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_REG
p.From.Reg = ppc64.REGTMP
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REG_CTR
// generate 4 MOVDs
// when this is a loop then the top must be saved
var top *obj.Prog
for offset := int64(0); offset < 32; offset += 8 {
// This is the top of loop
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_REG
p.From.Reg = ppc64.REG_R0
p.To.Type = obj.TYPE_MEM
p.To.Reg = v.Args[0].Reg()
p.To.Offset = offset
// Save the top of loop
if top == nil {
top = p
}
}
// Increment address for the
// 4 doublewords just zeroed.
p = s.Prog(ppc64.AADD)
p.Reg = v.Args[0].Reg()
p.From.Type = obj.TYPE_CONST
p.From.Offset = 32
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Args[0].Reg()
// Branch back to top of loop
// based on CTR
// BC with BO_BCTR generates bdnz
p = s.Prog(ppc64.ABC)
p.From.Type = obj.TYPE_CONST
p.From.Offset = ppc64.BO_BCTR
p.Reg = ppc64.REG_R0
p.To.Type = obj.TYPE_BRANCH
gc.Patch(p, top)
}
// when ctr == 1 the loop was not generated but
// there are at least 32 bytes to clear, so add
// that to the remainder to generate the code
// to clear those doublewords
if ctr == 1 {
rem += 32
}
// clear the remainder starting at offset zero
offset := int64(0)
// first clear as many doublewords as possible
// then clear remaining sizes as available
for rem > 0 {
op, size := ppc64.AMOVB, int64(1)
switch {
case rem >= 8:
op, size = ppc64.AMOVD, 8
case rem >= 4:
op, size = ppc64.AMOVW, 4
case rem >= 2:
op, size = ppc64.AMOVH, 2
}
p := s.Prog(op)
p.From.Type = obj.TYPE_REG
p.From.Reg = ppc64.REG_R0
p.To.Type = obj.TYPE_MEM
p.To.Reg = v.Args[0].Reg()
p.To.Offset = offset
rem -= size
offset += size
}
case ssa.OpPPC64LoweredMove:
// This will be used when moving more
// than 8 bytes. Moves start with as
// as many 8 byte moves as possible, then
// 4, 2, or 1 byte(s) as remaining. This will
// work and be efficient for power8 or later.
// If there are 64 or more bytes, then a
// loop is generated to move 32 bytes and
// update the src and dst addresses on each
// iteration. When < 64 bytes, the appropriate
// number of moves are generated based on the
// size.
// When moving >= 64 bytes a loop is used
// MOVD len/32,REG_TMP
// MOVD REG_TMP,CTR
// top:
// MOVD (R4),R7
// MOVD 8(R4),R8
// MOVD 16(R4),R9
// MOVD 24(R4),R10
// ADD R4,$32
// MOVD R7,(R3)
// MOVD R8,8(R3)
// MOVD R9,16(R3)
// MOVD R10,24(R3)
// ADD R3,$32
// BC 16,0,top
// Bytes not moved by this loop are moved
// with a combination of the following instructions,
// starting with the largest sizes and generating as
// many as needed, using the appropriate offset value.
// MOVD n(R4),R7
// MOVD R7,n(R3)
// MOVW n1(R4),R7
// MOVW R7,n1(R3)
// MOVH n2(R4),R7
// MOVH R7,n2(R3)
// MOVB n3(R4),R7
// MOVB R7,n3(R3)
// Each loop iteration moves 32 bytes
ctr := v.AuxInt / 32
// Remainder after the loop
rem := v.AuxInt % 32
dst_reg := v.Args[0].Reg()
src_reg := v.Args[1].Reg()
// The set of registers used here, must match the clobbered reg list
// in PPC64Ops.go.
useregs := []int16{ppc64.REG_R7, ppc64.REG_R8, ppc64.REG_R9, ppc64.REG_R10}
offset := int64(0)
// top of the loop
var top *obj.Prog
// Only generate looping code when loop counter is > 1 for >= 64 bytes
if ctr > 1 {
// Set up the CTR
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_CONST
p.From.Offset = ctr
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REGTMP
p = s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_REG
p.From.Reg = ppc64.REGTMP
p.To.Type = obj.TYPE_REG
p.To.Reg = ppc64.REG_CTR
// Generate all the MOVDs for loads
// based off the same register, increasing
// the offset by 8 for each instruction
for _, rg := range useregs {
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_MEM
p.From.Reg = src_reg
p.From.Offset = offset
p.To.Type = obj.TYPE_REG
p.To.Reg = rg
if top == nil {
top = p
}
offset += 8
}
// increment the src_reg for next iteration
p = s.Prog(ppc64.AADD)
p.Reg = src_reg
p.From.Type = obj.TYPE_CONST
p.From.Offset = 32
p.To.Type = obj.TYPE_REG
p.To.Reg = src_reg
// generate the MOVDs for stores, based
// off the same register, using the same
// offsets as in the loads.
offset = int64(0)
for _, rg := range useregs {
p := s.Prog(ppc64.AMOVD)
p.From.Type = obj.TYPE_REG
p.From.Reg = rg
p.To.Type = obj.TYPE_MEM
p.To.Reg = dst_reg
p.To.Offset = offset
offset += 8
}
// increment the dst_reg for next iteration
p = s.Prog(ppc64.AADD)