/
gsubr.go
1848 lines (1522 loc) · 37.1 KB
/
gsubr.go
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// Derived from Inferno utils/8c/txt.c
// http://code.google.com/p/inferno-os/source/browse/utils/8c/txt.c
//
// Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
// Portions Copyright © 1995-1997 C H Forsyth (forsyth@terzarima.net)
// Portions Copyright © 1997-1999 Vita Nuova Limited
// Portions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com)
// Portions Copyright © 2004,2006 Bruce Ellis
// Portions Copyright © 2005-2007 C H Forsyth (forsyth@terzarima.net)
// Revisions Copyright © 2000-2007 Lucent Technologies Inc. and others
// Portions Copyright © 2009 The Go Authors. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package x86
import (
"cmd/compile/internal/big"
"cmd/compile/internal/gc"
"cmd/internal/obj"
"cmd/internal/obj/x86"
"fmt"
)
// TODO(rsc): Can make this bigger if we move
// the text segment up higher in 8l for all GOOS.
// At the same time, can raise StackBig in ../../runtime/stack.h.
var unmappedzero uint32 = 4096
// foptoas flags
const (
Frev = 1 << 0
Fpop = 1 << 1
Fpop2 = 1 << 2
)
/*
* return Axxx for Oxxx on type t.
*/
func optoas(op gc.Op, t *gc.Type) int {
if t == nil {
gc.Fatalf("optoas: t is nil")
}
// avoid constant conversions in switches below
const (
OMINUS_ = uint32(gc.OMINUS) << 16
OLSH_ = uint32(gc.OLSH) << 16
ORSH_ = uint32(gc.ORSH) << 16
OADD_ = uint32(gc.OADD) << 16
OSUB_ = uint32(gc.OSUB) << 16
OMUL_ = uint32(gc.OMUL) << 16
ODIV_ = uint32(gc.ODIV) << 16
OMOD_ = uint32(gc.OMOD) << 16
OOR_ = uint32(gc.OOR) << 16
OAND_ = uint32(gc.OAND) << 16
OXOR_ = uint32(gc.OXOR) << 16
OEQ_ = uint32(gc.OEQ) << 16
ONE_ = uint32(gc.ONE) << 16
OLT_ = uint32(gc.OLT) << 16
OLE_ = uint32(gc.OLE) << 16
OGE_ = uint32(gc.OGE) << 16
OGT_ = uint32(gc.OGT) << 16
OCMP_ = uint32(gc.OCMP) << 16
OAS_ = uint32(gc.OAS) << 16
OHMUL_ = uint32(gc.OHMUL) << 16
OADDR_ = uint32(gc.OADDR) << 16
OINC_ = uint32(gc.OINC) << 16
ODEC_ = uint32(gc.ODEC) << 16
OLROT_ = uint32(gc.OLROT) << 16
OEXTEND_ = uint32(gc.OEXTEND) << 16
OCOM_ = uint32(gc.OCOM) << 16
)
a := obj.AXXX
switch uint32(op)<<16 | uint32(gc.Simtype[t.Etype]) {
default:
gc.Fatalf("optoas: no entry %v-%v", gc.Oconv(int(op), 0), t)
case OADDR_ | gc.TPTR32:
a = x86.ALEAL
case OEQ_ | gc.TBOOL,
OEQ_ | gc.TINT8,
OEQ_ | gc.TUINT8,
OEQ_ | gc.TINT16,
OEQ_ | gc.TUINT16,
OEQ_ | gc.TINT32,
OEQ_ | gc.TUINT32,
OEQ_ | gc.TINT64,
OEQ_ | gc.TUINT64,
OEQ_ | gc.TPTR32,
OEQ_ | gc.TPTR64,
OEQ_ | gc.TFLOAT32,
OEQ_ | gc.TFLOAT64:
a = x86.AJEQ
case ONE_ | gc.TBOOL,
ONE_ | gc.TINT8,
ONE_ | gc.TUINT8,
ONE_ | gc.TINT16,
ONE_ | gc.TUINT16,
ONE_ | gc.TINT32,
ONE_ | gc.TUINT32,
ONE_ | gc.TINT64,
ONE_ | gc.TUINT64,
ONE_ | gc.TPTR32,
ONE_ | gc.TPTR64,
ONE_ | gc.TFLOAT32,
ONE_ | gc.TFLOAT64:
a = x86.AJNE
case OLT_ | gc.TINT8,
OLT_ | gc.TINT16,
OLT_ | gc.TINT32,
OLT_ | gc.TINT64:
a = x86.AJLT
case OLT_ | gc.TUINT8,
OLT_ | gc.TUINT16,
OLT_ | gc.TUINT32,
OLT_ | gc.TUINT64:
a = x86.AJCS
case OLE_ | gc.TINT8,
OLE_ | gc.TINT16,
OLE_ | gc.TINT32,
OLE_ | gc.TINT64:
a = x86.AJLE
case OLE_ | gc.TUINT8,
OLE_ | gc.TUINT16,
OLE_ | gc.TUINT32,
OLE_ | gc.TUINT64:
a = x86.AJLS
case OGT_ | gc.TINT8,
OGT_ | gc.TINT16,
OGT_ | gc.TINT32,
OGT_ | gc.TINT64:
a = x86.AJGT
case OGT_ | gc.TUINT8,
OGT_ | gc.TUINT16,
OGT_ | gc.TUINT32,
OGT_ | gc.TUINT64,
OLT_ | gc.TFLOAT32,
OLT_ | gc.TFLOAT64:
a = x86.AJHI
case OGE_ | gc.TINT8,
OGE_ | gc.TINT16,
OGE_ | gc.TINT32,
OGE_ | gc.TINT64:
a = x86.AJGE
case OGE_ | gc.TUINT8,
OGE_ | gc.TUINT16,
OGE_ | gc.TUINT32,
OGE_ | gc.TUINT64,
OLE_ | gc.TFLOAT32,
OLE_ | gc.TFLOAT64:
a = x86.AJCC
case OCMP_ | gc.TBOOL,
OCMP_ | gc.TINT8,
OCMP_ | gc.TUINT8:
a = x86.ACMPB
case OCMP_ | gc.TINT16,
OCMP_ | gc.TUINT16:
a = x86.ACMPW
case OCMP_ | gc.TINT32,
OCMP_ | gc.TUINT32,
OCMP_ | gc.TPTR32:
a = x86.ACMPL
case OAS_ | gc.TBOOL,
OAS_ | gc.TINT8,
OAS_ | gc.TUINT8:
a = x86.AMOVB
case OAS_ | gc.TINT16,
OAS_ | gc.TUINT16:
a = x86.AMOVW
case OAS_ | gc.TINT32,
OAS_ | gc.TUINT32,
OAS_ | gc.TPTR32:
a = x86.AMOVL
case OAS_ | gc.TFLOAT32:
a = x86.AMOVSS
case OAS_ | gc.TFLOAT64:
a = x86.AMOVSD
case OADD_ | gc.TINT8,
OADD_ | gc.TUINT8:
a = x86.AADDB
case OADD_ | gc.TINT16,
OADD_ | gc.TUINT16:
a = x86.AADDW
case OADD_ | gc.TINT32,
OADD_ | gc.TUINT32,
OADD_ | gc.TPTR32:
a = x86.AADDL
case OSUB_ | gc.TINT8,
OSUB_ | gc.TUINT8:
a = x86.ASUBB
case OSUB_ | gc.TINT16,
OSUB_ | gc.TUINT16:
a = x86.ASUBW
case OSUB_ | gc.TINT32,
OSUB_ | gc.TUINT32,
OSUB_ | gc.TPTR32:
a = x86.ASUBL
case OINC_ | gc.TINT8,
OINC_ | gc.TUINT8:
a = x86.AINCB
case OINC_ | gc.TINT16,
OINC_ | gc.TUINT16:
a = x86.AINCW
case OINC_ | gc.TINT32,
OINC_ | gc.TUINT32,
OINC_ | gc.TPTR32:
a = x86.AINCL
case ODEC_ | gc.TINT8,
ODEC_ | gc.TUINT8:
a = x86.ADECB
case ODEC_ | gc.TINT16,
ODEC_ | gc.TUINT16:
a = x86.ADECW
case ODEC_ | gc.TINT32,
ODEC_ | gc.TUINT32,
ODEC_ | gc.TPTR32:
a = x86.ADECL
case OCOM_ | gc.TINT8,
OCOM_ | gc.TUINT8:
a = x86.ANOTB
case OCOM_ | gc.TINT16,
OCOM_ | gc.TUINT16:
a = x86.ANOTW
case OCOM_ | gc.TINT32,
OCOM_ | gc.TUINT32,
OCOM_ | gc.TPTR32:
a = x86.ANOTL
case OMINUS_ | gc.TINT8,
OMINUS_ | gc.TUINT8:
a = x86.ANEGB
case OMINUS_ | gc.TINT16,
OMINUS_ | gc.TUINT16:
a = x86.ANEGW
case OMINUS_ | gc.TINT32,
OMINUS_ | gc.TUINT32,
OMINUS_ | gc.TPTR32:
a = x86.ANEGL
case OAND_ | gc.TINT8,
OAND_ | gc.TUINT8:
a = x86.AANDB
case OAND_ | gc.TINT16,
OAND_ | gc.TUINT16:
a = x86.AANDW
case OAND_ | gc.TINT32,
OAND_ | gc.TUINT32,
OAND_ | gc.TPTR32:
a = x86.AANDL
case OOR_ | gc.TINT8,
OOR_ | gc.TUINT8:
a = x86.AORB
case OOR_ | gc.TINT16,
OOR_ | gc.TUINT16:
a = x86.AORW
case OOR_ | gc.TINT32,
OOR_ | gc.TUINT32,
OOR_ | gc.TPTR32:
a = x86.AORL
case OXOR_ | gc.TINT8,
OXOR_ | gc.TUINT8:
a = x86.AXORB
case OXOR_ | gc.TINT16,
OXOR_ | gc.TUINT16:
a = x86.AXORW
case OXOR_ | gc.TINT32,
OXOR_ | gc.TUINT32,
OXOR_ | gc.TPTR32:
a = x86.AXORL
case OLROT_ | gc.TINT8,
OLROT_ | gc.TUINT8:
a = x86.AROLB
case OLROT_ | gc.TINT16,
OLROT_ | gc.TUINT16:
a = x86.AROLW
case OLROT_ | gc.TINT32,
OLROT_ | gc.TUINT32,
OLROT_ | gc.TPTR32:
a = x86.AROLL
case OLSH_ | gc.TINT8,
OLSH_ | gc.TUINT8:
a = x86.ASHLB
case OLSH_ | gc.TINT16,
OLSH_ | gc.TUINT16:
a = x86.ASHLW
case OLSH_ | gc.TINT32,
OLSH_ | gc.TUINT32,
OLSH_ | gc.TPTR32:
a = x86.ASHLL
case ORSH_ | gc.TUINT8:
a = x86.ASHRB
case ORSH_ | gc.TUINT16:
a = x86.ASHRW
case ORSH_ | gc.TUINT32,
ORSH_ | gc.TPTR32:
a = x86.ASHRL
case ORSH_ | gc.TINT8:
a = x86.ASARB
case ORSH_ | gc.TINT16:
a = x86.ASARW
case ORSH_ | gc.TINT32:
a = x86.ASARL
case OHMUL_ | gc.TINT8,
OMUL_ | gc.TINT8,
OMUL_ | gc.TUINT8:
a = x86.AIMULB
case OHMUL_ | gc.TINT16,
OMUL_ | gc.TINT16,
OMUL_ | gc.TUINT16:
a = x86.AIMULW
case OHMUL_ | gc.TINT32,
OMUL_ | gc.TINT32,
OMUL_ | gc.TUINT32,
OMUL_ | gc.TPTR32:
a = x86.AIMULL
case OHMUL_ | gc.TUINT8:
a = x86.AMULB
case OHMUL_ | gc.TUINT16:
a = x86.AMULW
case OHMUL_ | gc.TUINT32,
OHMUL_ | gc.TPTR32:
a = x86.AMULL
case ODIV_ | gc.TINT8,
OMOD_ | gc.TINT8:
a = x86.AIDIVB
case ODIV_ | gc.TUINT8,
OMOD_ | gc.TUINT8:
a = x86.ADIVB
case ODIV_ | gc.TINT16,
OMOD_ | gc.TINT16:
a = x86.AIDIVW
case ODIV_ | gc.TUINT16,
OMOD_ | gc.TUINT16:
a = x86.ADIVW
case ODIV_ | gc.TINT32,
OMOD_ | gc.TINT32:
a = x86.AIDIVL
case ODIV_ | gc.TUINT32,
ODIV_ | gc.TPTR32,
OMOD_ | gc.TUINT32,
OMOD_ | gc.TPTR32:
a = x86.ADIVL
case OEXTEND_ | gc.TINT16:
a = x86.ACWD
case OEXTEND_ | gc.TINT32:
a = x86.ACDQ
}
return a
}
func foptoas(op gc.Op, t *gc.Type, flg int) int {
a := obj.AXXX
et := gc.Simtype[t.Etype]
// avoid constant conversions in switches below
const (
OCMP_ = uint32(gc.OCMP) << 16
OAS_ = uint32(gc.OAS) << 16
OADD_ = uint32(gc.OADD) << 16
OSUB_ = uint32(gc.OSUB) << 16
OMUL_ = uint32(gc.OMUL) << 16
ODIV_ = uint32(gc.ODIV) << 16
OMINUS_ = uint32(gc.OMINUS) << 16
)
if !gc.Thearch.Use387 {
switch uint32(op)<<16 | uint32(et) {
default:
gc.Fatalf("foptoas-sse: no entry %v-%v", gc.Oconv(int(op), 0), t)
case OCMP_ | gc.TFLOAT32:
a = x86.AUCOMISS
case OCMP_ | gc.TFLOAT64:
a = x86.AUCOMISD
case OAS_ | gc.TFLOAT32:
a = x86.AMOVSS
case OAS_ | gc.TFLOAT64:
a = x86.AMOVSD
case OADD_ | gc.TFLOAT32:
a = x86.AADDSS
case OADD_ | gc.TFLOAT64:
a = x86.AADDSD
case OSUB_ | gc.TFLOAT32:
a = x86.ASUBSS
case OSUB_ | gc.TFLOAT64:
a = x86.ASUBSD
case OMUL_ | gc.TFLOAT32:
a = x86.AMULSS
case OMUL_ | gc.TFLOAT64:
a = x86.AMULSD
case ODIV_ | gc.TFLOAT32:
a = x86.ADIVSS
case ODIV_ | gc.TFLOAT64:
a = x86.ADIVSD
}
return a
}
// If we need Fpop, it means we're working on
// two different floating-point registers, not memory.
// There the instruction only has a float64 form.
if flg&Fpop != 0 {
et = gc.TFLOAT64
}
// clear Frev if unneeded
switch op {
case gc.OADD,
gc.OMUL:
flg &^= Frev
}
switch uint32(op)<<16 | (uint32(et)<<8 | uint32(flg)) {
case OADD_ | (gc.TFLOAT32<<8 | 0):
return x86.AFADDF
case OADD_ | (gc.TFLOAT64<<8 | 0):
return x86.AFADDD
case OADD_ | (gc.TFLOAT64<<8 | Fpop):
return x86.AFADDDP
case OSUB_ | (gc.TFLOAT32<<8 | 0):
return x86.AFSUBF
case OSUB_ | (gc.TFLOAT32<<8 | Frev):
return x86.AFSUBRF
case OSUB_ | (gc.TFLOAT64<<8 | 0):
return x86.AFSUBD
case OSUB_ | (gc.TFLOAT64<<8 | Frev):
return x86.AFSUBRD
case OSUB_ | (gc.TFLOAT64<<8 | Fpop):
return x86.AFSUBDP
case OSUB_ | (gc.TFLOAT64<<8 | (Fpop | Frev)):
return x86.AFSUBRDP
case OMUL_ | (gc.TFLOAT32<<8 | 0):
return x86.AFMULF
case OMUL_ | (gc.TFLOAT64<<8 | 0):
return x86.AFMULD
case OMUL_ | (gc.TFLOAT64<<8 | Fpop):
return x86.AFMULDP
case ODIV_ | (gc.TFLOAT32<<8 | 0):
return x86.AFDIVF
case ODIV_ | (gc.TFLOAT32<<8 | Frev):
return x86.AFDIVRF
case ODIV_ | (gc.TFLOAT64<<8 | 0):
return x86.AFDIVD
case ODIV_ | (gc.TFLOAT64<<8 | Frev):
return x86.AFDIVRD
case ODIV_ | (gc.TFLOAT64<<8 | Fpop):
return x86.AFDIVDP
case ODIV_ | (gc.TFLOAT64<<8 | (Fpop | Frev)):
return x86.AFDIVRDP
case OCMP_ | (gc.TFLOAT32<<8 | 0):
return x86.AFCOMF
case OCMP_ | (gc.TFLOAT32<<8 | Fpop):
return x86.AFCOMFP
case OCMP_ | (gc.TFLOAT64<<8 | 0):
return x86.AFCOMD
case OCMP_ | (gc.TFLOAT64<<8 | Fpop):
return x86.AFCOMDP
case OCMP_ | (gc.TFLOAT64<<8 | Fpop2):
return x86.AFCOMDPP
case OMINUS_ | (gc.TFLOAT32<<8 | 0):
return x86.AFCHS
case OMINUS_ | (gc.TFLOAT64<<8 | 0):
return x86.AFCHS
}
gc.Fatalf("foptoas %v %v %#x", gc.Oconv(int(op), 0), t, flg)
return 0
}
var resvd = []int{
// REG_DI, // for movstring
// REG_SI, // for movstring
x86.REG_AX, // for divide
x86.REG_CX, // for shift
x86.REG_DX, // for divide, context
x86.REG_SP, // for stack
}
/*
* generate
* as $c, reg
*/
func gconreg(as int, c int64, reg int) {
var n1 gc.Node
var n2 gc.Node
gc.Nodconst(&n1, gc.Types[gc.TINT64], c)
gc.Nodreg(&n2, gc.Types[gc.TINT64], reg)
gins(as, &n1, &n2)
}
/*
* generate
* as $c, n
*/
func ginscon(as int, c int64, n2 *gc.Node) {
var n1 gc.Node
gc.Nodconst(&n1, gc.Types[gc.TINT32], c)
gins(as, &n1, n2)
}
func ginscmp(op gc.Op, t *gc.Type, n1, n2 *gc.Node, likely int) *obj.Prog {
if gc.Isint[t.Etype] || t.Etype == gc.Tptr {
if (n1.Op == gc.OLITERAL || n1.Op == gc.OADDR && n1.Left.Op == gc.ONAME) && n2.Op != gc.OLITERAL {
// Reverse comparison to place constant (including address constant) last.
op = gc.Brrev(op)
n1, n2 = n2, n1
}
}
// General case.
var r1, r2, g1, g2 gc.Node
// A special case to make write barriers more efficient.
// Comparing the first field of a named struct can be done directly.
base := n1
if n1.Op == gc.ODOT && n1.Left.Type.Etype == gc.TSTRUCT && n1.Left.Type.Type.Sym == n1.Right.Sym {
base = n1.Left
}
if base.Op == gc.ONAME && base.Class&gc.PHEAP == 0 || n1.Op == gc.OINDREG {
r1 = *n1
} else {
gc.Regalloc(&r1, t, n1)
gc.Regalloc(&g1, n1.Type, &r1)
gc.Cgen(n1, &g1)
gmove(&g1, &r1)
}
if n2.Op == gc.OLITERAL && gc.Isint[t.Etype] || n2.Op == gc.OADDR && n2.Left.Op == gc.ONAME && n2.Left.Class == gc.PEXTERN {
r2 = *n2
} else {
gc.Regalloc(&r2, t, n2)
gc.Regalloc(&g2, n1.Type, &r2)
gc.Cgen(n2, &g2)
gmove(&g2, &r2)
}
gins(optoas(gc.OCMP, t), &r1, &r2)
if r1.Op == gc.OREGISTER {
gc.Regfree(&g1)
gc.Regfree(&r1)
}
if r2.Op == gc.OREGISTER {
gc.Regfree(&g2)
gc.Regfree(&r2)
}
return gc.Gbranch(optoas(op, t), nil, likely)
}
/*
* swap node contents
*/
func nswap(a *gc.Node, b *gc.Node) {
t := *a
*a = *b
*b = t
}
/*
* return constant i node.
* overwritten by next call, but useful in calls to gins.
*/
var ncon_n gc.Node
func ncon(i uint32) *gc.Node {
if ncon_n.Type == nil {
gc.Nodconst(&ncon_n, gc.Types[gc.TUINT32], 0)
}
ncon_n.SetInt(int64(i))
return &ncon_n
}
var sclean [10]gc.Node
var nsclean int
/*
* n is a 64-bit value. fill in lo and hi to refer to its 32-bit halves.
*/
func split64(n *gc.Node, lo *gc.Node, hi *gc.Node) {
if !gc.Is64(n.Type) {
gc.Fatalf("split64 %v", n.Type)
}
if nsclean >= len(sclean) {
gc.Fatalf("split64 clean")
}
sclean[nsclean].Op = gc.OEMPTY
nsclean++
switch n.Op {
default:
switch n.Op {
default:
var n1 gc.Node
if !dotaddable(n, &n1) {
gc.Igen(n, &n1, nil)
sclean[nsclean-1] = n1
}
n = &n1
case gc.ONAME:
if n.Class == gc.PPARAMREF {
var n1 gc.Node
gc.Cgen(n.Name.Heapaddr, &n1)
sclean[nsclean-1] = n1
n = &n1
}
// nothing
case gc.OINDREG:
break
}
*lo = *n
*hi = *n
lo.Type = gc.Types[gc.TUINT32]
if n.Type.Etype == gc.TINT64 {
hi.Type = gc.Types[gc.TINT32]
} else {
hi.Type = gc.Types[gc.TUINT32]
}
hi.Xoffset += 4
case gc.OLITERAL:
var n1 gc.Node
n.Convconst(&n1, n.Type)
i := n1.Int()
gc.Nodconst(lo, gc.Types[gc.TUINT32], int64(uint32(i)))
i >>= 32
if n.Type.Etype == gc.TINT64 {
gc.Nodconst(hi, gc.Types[gc.TINT32], int64(int32(i)))
} else {
gc.Nodconst(hi, gc.Types[gc.TUINT32], int64(uint32(i)))
}
}
}
func splitclean() {
if nsclean <= 0 {
gc.Fatalf("splitclean")
}
nsclean--
if sclean[nsclean].Op != gc.OEMPTY {
gc.Regfree(&sclean[nsclean])
}
}
// set up nodes representing fp constants
var (
zerof gc.Node
two63f gc.Node
two64f gc.Node
bignodes_did bool
)
func bignodes() {
if bignodes_did {
return
}
bignodes_did = true
gc.Nodconst(&zerof, gc.Types[gc.TINT64], 0)
zerof.Convconst(&zerof, gc.Types[gc.TFLOAT64])
var i big.Int
i.SetInt64(1)
i.Lsh(&i, 63)
var bigi gc.Node
gc.Nodconst(&bigi, gc.Types[gc.TUINT64], 0)
bigi.SetBigInt(&i)
bigi.Convconst(&two63f, gc.Types[gc.TFLOAT64])
gc.Nodconst(&bigi, gc.Types[gc.TUINT64], 0)
i.Lsh(&i, 1)
bigi.SetBigInt(&i)
bigi.Convconst(&two64f, gc.Types[gc.TFLOAT64])
}
func memname(n *gc.Node, t *gc.Type) {
gc.Tempname(n, t)
n.Sym = gc.Lookup("." + n.Sym.Name[1:]) // keep optimizer from registerizing
n.Orig.Sym = n.Sym
}
func gmove(f *gc.Node, t *gc.Node) {
if gc.Debug['M'] != 0 {
fmt.Printf("gmove %v -> %v\n", f, t)
}
ft := gc.Simsimtype(f.Type)
tt := gc.Simsimtype(t.Type)
cvt := t.Type
if gc.Iscomplex[ft] || gc.Iscomplex[tt] {
gc.Complexmove(f, t)
return
}
if gc.Isfloat[ft] || gc.Isfloat[tt] {
floatmove(f, t)
return
}
// cannot have two integer memory operands;
// except 64-bit, which always copies via registers anyway.
var r1 gc.Node
var a int
if gc.Isint[ft] && gc.Isint[tt] && !gc.Is64(f.Type) && !gc.Is64(t.Type) && gc.Ismem(f) && gc.Ismem(t) {
goto hard
}
// convert constant to desired type
if f.Op == gc.OLITERAL {
var con gc.Node
f.Convconst(&con, t.Type)
f = &con
ft = gc.Simsimtype(con.Type)
}
// value -> value copy, only one memory operand.
// figure out the instruction to use.
// break out of switch for one-instruction gins.
// goto rdst for "destination must be register".
// goto hard for "convert to cvt type first".
// otherwise handle and return.
switch uint32(ft)<<16 | uint32(tt) {
default:
// should not happen
gc.Fatalf("gmove %v -> %v", f, t)
return
/*
* integer copy and truncate
*/
case gc.TINT8<<16 | gc.TINT8, // same size
gc.TINT8<<16 | gc.TUINT8,
gc.TUINT8<<16 | gc.TINT8,
gc.TUINT8<<16 | gc.TUINT8:
a = x86.AMOVB
case gc.TINT16<<16 | gc.TINT8, // truncate
gc.TUINT16<<16 | gc.TINT8,
gc.TINT32<<16 | gc.TINT8,
gc.TUINT32<<16 | gc.TINT8,
gc.TINT16<<16 | gc.TUINT8,
gc.TUINT16<<16 | gc.TUINT8,
gc.TINT32<<16 | gc.TUINT8,
gc.TUINT32<<16 | gc.TUINT8:
a = x86.AMOVB
goto rsrc
case gc.TINT64<<16 | gc.TINT8, // truncate low word
gc.TUINT64<<16 | gc.TINT8,
gc.TINT64<<16 | gc.TUINT8,
gc.TUINT64<<16 | gc.TUINT8:
var flo gc.Node
var fhi gc.Node
split64(f, &flo, &fhi)
var r1 gc.Node
gc.Nodreg(&r1, t.Type, x86.REG_AX)
gmove(&flo, &r1)
gins(x86.AMOVB, &r1, t)
splitclean()
return
case gc.TINT16<<16 | gc.TINT16, // same size
gc.TINT16<<16 | gc.TUINT16,
gc.TUINT16<<16 | gc.TINT16,
gc.TUINT16<<16 | gc.TUINT16:
a = x86.AMOVW
case gc.TINT32<<16 | gc.TINT16, // truncate
gc.TUINT32<<16 | gc.TINT16,
gc.TINT32<<16 | gc.TUINT16,
gc.TUINT32<<16 | gc.TUINT16:
a = x86.AMOVW
goto rsrc
case gc.TINT64<<16 | gc.TINT16, // truncate low word
gc.TUINT64<<16 | gc.TINT16,
gc.TINT64<<16 | gc.TUINT16,
gc.TUINT64<<16 | gc.TUINT16:
var flo gc.Node
var fhi gc.Node
split64(f, &flo, &fhi)
var r1 gc.Node
gc.Nodreg(&r1, t.Type, x86.REG_AX)
gmove(&flo, &r1)
gins(x86.AMOVW, &r1, t)
splitclean()
return
case gc.TINT32<<16 | gc.TINT32, // same size
gc.TINT32<<16 | gc.TUINT32,
gc.TUINT32<<16 | gc.TINT32,
gc.TUINT32<<16 | gc.TUINT32:
a = x86.AMOVL
case gc.TINT64<<16 | gc.TINT32, // truncate
gc.TUINT64<<16 | gc.TINT32,
gc.TINT64<<16 | gc.TUINT32,
gc.TUINT64<<16 | gc.TUINT32:
var fhi gc.Node
var flo gc.Node
split64(f, &flo, &fhi)
var r1 gc.Node
gc.Nodreg(&r1, t.Type, x86.REG_AX)
gmove(&flo, &r1)
gins(x86.AMOVL, &r1, t)
splitclean()
return
case gc.TINT64<<16 | gc.TINT64, // same size
gc.TINT64<<16 | gc.TUINT64,
gc.TUINT64<<16 | gc.TINT64,
gc.TUINT64<<16 | gc.TUINT64:
var fhi gc.Node
var flo gc.Node
split64(f, &flo, &fhi)
var tlo gc.Node
var thi gc.Node
split64(t, &tlo, &thi)
if f.Op == gc.OLITERAL {
gins(x86.AMOVL, &flo, &tlo)
gins(x86.AMOVL, &fhi, &thi)
} else {
// Implementation of conversion-free x = y for int64 or uint64 x.
// This is generated by the code that copies small values out of closures,
// and that code has DX live, so avoid DX and just use AX twice.
var r1 gc.Node
gc.Nodreg(&r1, gc.Types[gc.TUINT32], x86.REG_AX)
gins(x86.AMOVL, &flo, &r1)
gins(x86.AMOVL, &r1, &tlo)
gins(x86.AMOVL, &fhi, &r1)
gins(x86.AMOVL, &r1, &thi)
}
splitclean()
splitclean()
return
/*
* integer up-conversions
*/
case gc.TINT8<<16 | gc.TINT16, // sign extend int8
gc.TINT8<<16 | gc.TUINT16:
a = x86.AMOVBWSX
goto rdst
case gc.TINT8<<16 | gc.TINT32,
gc.TINT8<<16 | gc.TUINT32:
a = x86.AMOVBLSX
goto rdst
case gc.TINT8<<16 | gc.TINT64, // convert via int32
gc.TINT8<<16 | gc.TUINT64:
cvt = gc.Types[gc.TINT32]
goto hard
case gc.TUINT8<<16 | gc.TINT16, // zero extend uint8
gc.TUINT8<<16 | gc.TUINT16:
a = x86.AMOVBWZX
goto rdst