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go / go / 3af0d791bed25e6cb4689fed9cc8379554971cb8 / . / src / cmd / 5g / gsubr.go
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// Derived from Inferno utils/5c/txt.c
// http://code.google.com/p/inferno-os/source/browse/utils/5c/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 main
import (
"cmd/internal/obj"
"cmd/internal/obj/arm"
"fmt"
)
import "cmd/internal/gc"
// TODO(rsc): Can make this bigger if we move
// the text segment up higher in 5l for all GOOS.
// At the same time, can raise StackBig in ../../runtime/stack.h.
var unmappedzero int = 4096
var resvd = []int{
9, // reserved for m
10, // reserved for g
arm.REGSP, // reserved for SP
}
func ginit() {
var i int
for i = 0; i < len(reg); i++ {
reg[i] = 0
}
for i = 0; i < len(resvd); i++ {
reg[resvd[i]]++
}
}
func gclean() {
var i int
for i = 0; i < len(resvd); i++ {
reg[resvd[i]]--
}
for i = 0; i < len(reg); i++ {
if reg[i] != 0 {
gc.Yyerror("reg %v left allocated\n", gc.Ctxt.Rconv(i))
}
}
}
func anyregalloc() bool {
var i int
var j int
for i = 0; i < len(reg); i++ {
if reg[i] == 0 {
goto ok
}
for j = 0; j < len(resvd); j++ {
if resvd[j] == i {
goto ok
}
}
return true
ok:
}
return false
}
var regpc [REGALLOC_FMAX + 1]uint32
/*
* allocate register of type t, leave in n.
* if o != N, o is desired fixed register.
* caller must regfree(n).
*/
func regalloc(n *gc.Node, t *gc.Type, o *gc.Node) {
var i int
var et int
var fixfree int
var floatfree int
if false && gc.Debug['r'] != 0 {
fixfree = 0
for i = REGALLOC_R0; i <= REGALLOC_RMAX; i++ {
if reg[i] == 0 {
fixfree++
}
}
floatfree = 0
for i = REGALLOC_F0; i <= REGALLOC_FMAX; i++ {
if reg[i] == 0 {
floatfree++
}
}
fmt.Printf("regalloc fix %d float %d\n", fixfree, floatfree)
}
if t == nil {
gc.Fatal("regalloc: t nil")
}
et = int(gc.Simtype[t.Etype])
if gc.Is64(t) {
gc.Fatal("regalloc: 64 bit type %v")
}
switch et {
case gc.TINT8,
gc.TUINT8,
gc.TINT16,
gc.TUINT16,
gc.TINT32,
gc.TUINT32,
gc.TPTR32,
gc.TBOOL:
if o != nil && o.Op == gc.OREGISTER {
i = int(o.Val.U.Reg)
if i >= REGALLOC_R0 && i <= REGALLOC_RMAX {
goto out
}
}
for i = REGALLOC_R0; i <= REGALLOC_RMAX; i++ {
if reg[i] == 0 {
regpc[i] = uint32(obj.Getcallerpc(&n))
goto out
}
}
fmt.Printf("registers allocated at\n")
for i = REGALLOC_R0; i <= REGALLOC_RMAX; i++ {
fmt.Printf("%d %p\n", i, regpc[i])
}
gc.Fatal("out of fixed registers")
goto err
case gc.TFLOAT32,
gc.TFLOAT64:
if o != nil && o.Op == gc.OREGISTER {
i = int(o.Val.U.Reg)
if i >= REGALLOC_F0 && i <= REGALLOC_FMAX {
goto out
}
}
for i = REGALLOC_F0; i <= REGALLOC_FMAX; i++ {
if reg[i] == 0 {
goto out
}
}
gc.Fatal("out of floating point registers")
goto err
case gc.TCOMPLEX64,
gc.TCOMPLEX128:
gc.Tempname(n, t)
return
}
gc.Yyerror("regalloc: unknown type %v", gc.Tconv(t, 0))
err:
gc.Nodreg(n, t, arm.REG_R0)
return
out:
reg[i]++
gc.Nodreg(n, t, i)
}
func regfree(n *gc.Node) {
var i int
var fixfree int
var floatfree int
if false && gc.Debug['r'] != 0 {
fixfree = 0
for i = REGALLOC_R0; i <= REGALLOC_RMAX; i++ {
if reg[i] == 0 {
fixfree++
}
}
floatfree = 0
for i = REGALLOC_F0; i <= REGALLOC_FMAX; i++ {
if reg[i] == 0 {
floatfree++
}
}
fmt.Printf("regalloc fix %d float %d\n", fixfree, floatfree)
}
if n.Op == gc.ONAME {
return
}
if n.Op != gc.OREGISTER && n.Op != gc.OINDREG {
gc.Fatal("regfree: not a register")
}
i = int(n.Val.U.Reg)
if i == arm.REGSP {
return
}
if i < 0 || i >= len(reg) || i >= len(regpc) {
gc.Fatal("regfree: reg out of range")
}
if reg[i] <= 0 {
gc.Fatal("regfree: reg %v not allocated", gc.Ctxt.Rconv(i))
}
reg[i]--
if reg[i] == 0 {
regpc[i] = 0
}
}
/*
* 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)
}
gc.Mpmovecfix(ncon_n.Val.U.Xval, 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) {
var n1 gc.Node
var i int64
if !gc.Is64(n.Type) {
gc.Fatal("split64 %v", gc.Tconv(n.Type, 0))
}
if nsclean >= len(sclean) {
gc.Fatal("split64 clean")
}
sclean[nsclean].Op = gc.OEMPTY
nsclean++
switch n.Op {
default:
switch n.Op {
default:
if !dotaddable(n, &n1) {
igen(n, &n1, nil)
sclean[nsclean-1] = n1
}
n = &n1
case gc.ONAME:
if n.Class == gc.PPARAMREF {
cgen(n.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:
gc.Convconst(&n1, n.Type, &n.Val)
i = gc.Mpgetfix(n1.Val.U.Xval)
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.Fatal("splitclean")
}
nsclean--
if sclean[nsclean].Op != gc.OEMPTY {
regfree(&sclean[nsclean])
}
}
func gmove(f *gc.Node, t *gc.Node) {
var a int
var ft int
var tt int
var fa int
var ta int
var cvt *gc.Type
var r1 gc.Node
var r2 gc.Node
var flo gc.Node
var fhi gc.Node
var tlo gc.Node
var thi gc.Node
var con gc.Node
var p1 *obj.Prog
if gc.Debug['M'] != 0 {
fmt.Printf("gmove %v -> %v\n", gc.Nconv(f, 0), gc.Nconv(t, 0))
}
ft = gc.Simsimtype(f.Type)
tt = gc.Simsimtype(t.Type)
cvt = t.Type
if gc.Iscomplex[ft] != 0 || gc.Iscomplex[tt] != 0 {
gc.Complexmove(f, t)
return
}
// cannot have two memory operands;
// except 64-bit, which always copies via registers anyway.
if !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 {
switch tt {
default:
gc.Convconst(&con, t.Type, &f.Val)
case gc.TINT16,
gc.TINT8:
gc.Convconst(&con, gc.Types[gc.TINT32], &f.Val)
regalloc(&r1, con.Type, t)
gins(arm.AMOVW, &con, &r1)
gmove(&r1, t)
regfree(&r1)
return
case gc.TUINT16,
gc.TUINT8:
gc.Convconst(&con, gc.Types[gc.TUINT32], &f.Val)
regalloc(&r1, con.Type, t)
gins(arm.AMOVW, &con, &r1)
gmove(&r1, t)
regfree(&r1)
return
}
f = &con
ft = gc.Simsimtype(con.Type)
// constants can't move directly to memory
if gc.Ismem(t) && !gc.Is64(t.Type) {
goto hard
}
}
// 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:
goto fatal
/*
* integer copy and truncate
*/
case gc.TINT8<<16 | gc.TINT8: // same size
if !gc.Ismem(f) {
a = arm.AMOVB
break
}
fallthrough
case gc.TUINT8<<16 | gc.TINT8,
gc.TINT16<<16 | gc.TINT8, // truncate
gc.TUINT16<<16 | gc.TINT8,
gc.TINT32<<16 | gc.TINT8,
gc.TUINT32<<16 | gc.TINT8:
a = arm.AMOVBS
case gc.TUINT8<<16 | gc.TUINT8:
if !gc.Ismem(f) {
a = arm.AMOVB
break
}
fallthrough
case gc.TINT8<<16 | gc.TUINT8,
gc.TINT16<<16 | gc.TUINT8,
gc.TUINT16<<16 | gc.TUINT8,
gc.TINT32<<16 | gc.TUINT8,
gc.TUINT32<<16 | gc.TUINT8:
a = arm.AMOVBU
case gc.TINT64<<16 | gc.TINT8, // truncate low word
gc.TUINT64<<16 | gc.TINT8:
a = arm.AMOVBS
goto trunc64
case gc.TINT64<<16 | gc.TUINT8,
gc.TUINT64<<16 | gc.TUINT8:
a = arm.AMOVBU
goto trunc64
case gc.TINT16<<16 | gc.TINT16: // same size
if !gc.Ismem(f) {
a = arm.AMOVH
break
}
fallthrough
case gc.TUINT16<<16 | gc.TINT16,
gc.TINT32<<16 | gc.TINT16, // truncate
gc.TUINT32<<16 | gc.TINT16:
a = arm.AMOVHS
case gc.TUINT16<<16 | gc.TUINT16:
if !gc.Ismem(f) {
a = arm.AMOVH
break
}
fallthrough
case gc.TINT16<<16 | gc.TUINT16,
gc.TINT32<<16 | gc.TUINT16,
gc.TUINT32<<16 | gc.TUINT16:
a = arm.AMOVHU
case gc.TINT64<<16 | gc.TINT16, // truncate low word
gc.TUINT64<<16 | gc.TINT16:
a = arm.AMOVHS
goto trunc64
case gc.TINT64<<16 | gc.TUINT16,
gc.TUINT64<<16 | gc.TUINT16:
a = arm.AMOVHU
goto trunc64
case gc.TINT32<<16 | gc.TINT32, // same size
gc.TINT32<<16 | gc.TUINT32,
gc.TUINT32<<16 | gc.TINT32,
gc.TUINT32<<16 | gc.TUINT32:
a = arm.AMOVW
case gc.TINT64<<16 | gc.TINT32, // truncate
gc.TUINT64<<16 | gc.TINT32,
gc.TINT64<<16 | gc.TUINT32,
gc.TUINT64<<16 | gc.TUINT32:
split64(f, &flo, &fhi)
regalloc(&r1, t.Type, nil)
gins(arm.AMOVW, &flo, &r1)
gins(arm.AMOVW, &r1, t)
regfree(&r1)
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:
split64(f, &flo, &fhi)
split64(t, &tlo, &thi)
regalloc(&r1, flo.Type, nil)
regalloc(&r2, fhi.Type, nil)
gins(arm.AMOVW, &flo, &r1)
gins(arm.AMOVW, &fhi, &r2)
gins(arm.AMOVW, &r1, &tlo)
gins(arm.AMOVW, &r2, &thi)
regfree(&r1)
regfree(&r2)
splitclean()
splitclean()
return
/*
* integer up-conversions
*/
case gc.TINT8<<16 | gc.TINT16, // sign extend int8
gc.TINT8<<16 | gc.TUINT16,
gc.TINT8<<16 | gc.TINT32,
gc.TINT8<<16 | gc.TUINT32:
a = arm.AMOVBS
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,
gc.TUINT8<<16 | gc.TINT32,
gc.TUINT8<<16 | gc.TUINT32:
a = arm.AMOVBU
goto rdst
case gc.TUINT8<<16 | gc.TINT64, // convert via uint32
gc.TUINT8<<16 | gc.TUINT64:
cvt = gc.Types[gc.TUINT32]
goto hard
case gc.TINT16<<16 | gc.TINT32, // sign extend int16
gc.TINT16<<16 | gc.TUINT32:
a = arm.AMOVHS
goto rdst
case gc.TINT16<<16 | gc.TINT64, // convert via int32
gc.TINT16<<16 | gc.TUINT64:
cvt = gc.Types[gc.TINT32]
goto hard
case gc.TUINT16<<16 | gc.TINT32, // zero extend uint16
gc.TUINT16<<16 | gc.TUINT32:
a = arm.AMOVHU
goto rdst
case gc.TUINT16<<16 | gc.TINT64, // convert via uint32
gc.TUINT16<<16 | gc.TUINT64:
cvt = gc.Types[gc.TUINT32]
goto hard
case gc.TINT32<<16 | gc.TINT64, // sign extend int32
gc.TINT32<<16 | gc.TUINT64:
split64(t, &tlo, &thi)
regalloc(&r1, tlo.Type, nil)
regalloc(&r2, thi.Type, nil)
gmove(f, &r1)
p1 = gins(arm.AMOVW, &r1, &r2)
p1.From.Type = obj.TYPE_SHIFT
p1.From.Offset = 2<<5 | 31<<7 | int64(r1.Val.U.Reg)&15 // r1->31
p1.From.Reg = 0
//print("gmove: %P\n", p1);
gins(arm.AMOVW, &r1, &tlo)
gins(arm.AMOVW, &r2, &thi)
regfree(&r1)
regfree(&r2)
splitclean()
return
case gc.TUINT32<<16 | gc.TINT64, // zero extend uint32
gc.TUINT32<<16 | gc.TUINT64:
split64(t, &tlo, &thi)
gmove(f, &tlo)
regalloc(&r1, thi.Type, nil)
gins(arm.AMOVW, ncon(0), &r1)
gins(arm.AMOVW, &r1, &thi)
regfree(&r1)
splitclean()
return
// case CASE(TFLOAT64, TUINT64):
/*
* float to integer
*/
case gc.TFLOAT32<<16 | gc.TINT8,
gc.TFLOAT32<<16 | gc.TUINT8,
gc.TFLOAT32<<16 | gc.TINT16,
gc.TFLOAT32<<16 | gc.TUINT16,
gc.TFLOAT32<<16 | gc.TINT32,
gc.TFLOAT32<<16 | gc.TUINT32,
// case CASE(TFLOAT32, TUINT64):
gc.TFLOAT64<<16 | gc.TINT8,
gc.TFLOAT64<<16 | gc.TUINT8,
gc.TFLOAT64<<16 | gc.TINT16,
gc.TFLOAT64<<16 | gc.TUINT16,
gc.TFLOAT64<<16 | gc.TINT32,
gc.TFLOAT64<<16 | gc.TUINT32:
fa = arm.AMOVF
a = arm.AMOVFW
if ft == gc.TFLOAT64 {
fa = arm.AMOVD
a = arm.AMOVDW
}
ta = arm.AMOVW
switch tt {
case gc.TINT8:
ta = arm.AMOVBS
case gc.TUINT8:
ta = arm.AMOVBU
case gc.TINT16:
ta = arm.AMOVHS
case gc.TUINT16:
ta = arm.AMOVHU
}
regalloc(&r1, gc.Types[ft], f)
regalloc(&r2, gc.Types[tt], t)
gins(fa, f, &r1) // load to fpu
p1 = gins(a, &r1, &r1) // convert to w
switch tt {
case gc.TUINT8,
gc.TUINT16,
gc.TUINT32:
p1.Scond |= arm.C_UBIT
}
gins(arm.AMOVW, &r1, &r2) // copy to cpu
gins(ta, &r2, t) // store
regfree(&r1)
regfree(&r2)
return
/*
* integer to float
*/
case gc.TINT8<<16 | gc.TFLOAT32,
gc.TUINT8<<16 | gc.TFLOAT32,
gc.TINT16<<16 | gc.TFLOAT32,
gc.TUINT16<<16 | gc.TFLOAT32,
gc.TINT32<<16 | gc.TFLOAT32,
gc.TUINT32<<16 | gc.TFLOAT32,
gc.TINT8<<16 | gc.TFLOAT64,
gc.TUINT8<<16 | gc.TFLOAT64,
gc.TINT16<<16 | gc.TFLOAT64,
gc.TUINT16<<16 | gc.TFLOAT64,
gc.TINT32<<16 | gc.TFLOAT64,
gc.TUINT32<<16 | gc.TFLOAT64:
fa = arm.AMOVW
switch ft {
case gc.TINT8:
fa = arm.AMOVBS
case gc.TUINT8:
fa = arm.AMOVBU
case gc.TINT16:
fa = arm.AMOVHS
case gc.TUINT16:
fa = arm.AMOVHU
}
a = arm.AMOVWF
ta = arm.AMOVF
if tt == gc.TFLOAT64 {
a = arm.AMOVWD
ta = arm.AMOVD
}
regalloc(&r1, gc.Types[ft], f)
regalloc(&r2, gc.Types[tt], t)
gins(fa, f, &r1) // load to cpu
gins(arm.AMOVW, &r1, &r2) // copy to fpu
p1 = gins(a, &r2, &r2) // convert
switch ft {
case gc.TUINT8,
gc.TUINT16,
gc.TUINT32:
p1.Scond |= arm.C_UBIT
}
gins(ta, &r2, t) // store
regfree(&r1)
regfree(&r2)
return
case gc.TUINT64<<16 | gc.TFLOAT32,
gc.TUINT64<<16 | gc.TFLOAT64:
gc.Fatal("gmove UINT64, TFLOAT not implemented")
return
/*
* float to float
*/
case gc.TFLOAT32<<16 | gc.TFLOAT32:
a = arm.AMOVF
case gc.TFLOAT64<<16 | gc.TFLOAT64:
a = arm.AMOVD
case gc.TFLOAT32<<16 | gc.TFLOAT64:
regalloc(&r1, gc.Types[gc.TFLOAT64], t)
gins(arm.AMOVF, f, &r1)
gins(arm.AMOVFD, &r1, &r1)
gins(arm.AMOVD, &r1, t)
regfree(&r1)
return
case gc.TFLOAT64<<16 | gc.TFLOAT32:
regalloc(&r1, gc.Types[gc.TFLOAT64], t)
gins(arm.AMOVD, f, &r1)
gins(arm.AMOVDF, &r1, &r1)
gins(arm.AMOVF, &r1, t)
regfree(&r1)
return
}
gins(a, f, t)
return
// TODO(kaib): we almost always require a register dest anyway, this can probably be
// removed.
// requires register destination
rdst:
regalloc(&r1, t.Type, t)
gins(a, f, &r1)
gmove(&r1, t)
regfree(&r1)
return
// requires register intermediate
hard:
regalloc(&r1, cvt, t)
gmove(f, &r1)
gmove(&r1, t)
regfree(&r1)
return
// truncate 64 bit integer
trunc64:
split64(f, &flo, &fhi)
regalloc(&r1, t.Type, nil)
gins(a, &flo, &r1)
gins(a, &r1, t)
regfree(&r1)
splitclean()
return
// should not happen
fatal:
gc.Fatal("gmove %v -> %v", gc.Nconv(f, 0), gc.Nconv(t, 0))
}
func samaddr(f *gc.Node, t *gc.Node) bool {
if f.Op != t.Op {
return false
}
switch f.Op {
case gc.OREGISTER:
if f.Val.U.Reg != t.Val.U.Reg {
break
}
return true
}
return false
}
/*
* generate one instruction:
* as f, t
*/
func gins(as int, f *gc.Node, t *gc.Node) *obj.Prog {
var p *obj.Prog
var af obj.Addr
// Node nod;
// int32 v;
var at obj.Addr
if f != nil && f.Op == gc.OINDEX {
gc.Fatal("gins OINDEX not implemented")
}
// regalloc(&nod, &regnode, Z);
// v = constnode.vconst;
// cgen(f->right, &nod);
// constnode.vconst = v;
// idx.reg = nod.reg;
// regfree(&nod);
if t != nil && t.Op == gc.OINDEX {
gc.Fatal("gins OINDEX not implemented")
}
// regalloc(&nod, &regnode, Z);
// v = constnode.vconst;
// cgen(t->right, &nod);
// constnode.vconst = v;
// idx.reg = nod.reg;
// regfree(&nod);
af = obj.Addr{}
at = obj.Addr{}
if f != nil {
gc.Naddr(f, &af, 1)
}
if t != nil {
gc.Naddr(t, &at, 1)
}
p = gc.Prog(as)
if f != nil {
p.From = af
}
if t != nil {
p.To = at
}
if gc.Debug['g'] != 0 {
fmt.Printf("%v\n", p)
}
return p
}
/*
* insert n into reg slot of p
*/
func raddr(n *gc.Node, p *obj.Prog) {
var a obj.Addr
gc.Naddr(n, &a, 1)
if a.Type != obj.TYPE_REG {
if n != nil {
gc.Fatal("bad in raddr: %v", gc.Oconv(int(n.Op), 0))
} else {
gc.Fatal("bad in raddr: <null>")
}
p.Reg = 0
} else {
p.Reg = a.Reg
}
}
/* generate a comparison
TODO(kaib): one of the args can actually be a small constant. relax the constraint and fix call sites.
*/
func gcmp(as int, lhs *gc.Node, rhs *gc.Node) *obj.Prog {
var p *obj.Prog
if lhs.Op != gc.OREGISTER {
gc.Fatal("bad operands to gcmp: %v %v", gc.Oconv(int(lhs.Op), 0), gc.Oconv(int(rhs.Op), 0))
}
p = gins(as, rhs, nil)
raddr(lhs, p)
return p
}
/* generate a constant shift
* arm encodes a shift by 32 as 0, thus asking for 0 shift is illegal.
*/
func gshift(as int, lhs *gc.Node, stype int32, sval int32, rhs *gc.Node) *obj.Prog {
var p *obj.Prog
if sval <= 0 || sval > 32 {
gc.Fatal("bad shift value: %d", sval)
}
sval = sval & 0x1f
p = gins(as, nil, rhs)
p.From.Type = obj.TYPE_SHIFT
p.From.Offset = int64(stype) | int64(sval)<<7 | int64(lhs.Val.U.Reg)&15
return p
}
/* generate a register shift
*/
func gregshift(as int, lhs *gc.Node, stype int32, reg *gc.Node, rhs *gc.Node) *obj.Prog {
var p *obj.Prog
p = gins(as, nil, rhs)
p.From.Type = obj.TYPE_SHIFT
p.From.Offset = int64(stype) | (int64(reg.Val.U.Reg)&15)<<8 | 1<<4 | int64(lhs.Val.U.Reg)&15
return p
}
/*
* return Axxx for Oxxx on type t.
*/
func optoas(op int, t *gc.Type) int {
var a int
if t == nil {
gc.Fatal("optoas: t is nil")
}
a = obj.AXXX
switch uint32(op)<<16 | uint32(gc.Simtype[t.Etype]) {
default:
gc.Fatal("optoas: no entry %v-%v etype %v simtype %v", gc.Oconv(int(op), 0), gc.Tconv(t, 0), gc.Tconv(gc.Types[t.Etype], 0), gc.Tconv(gc.Types[gc.Simtype[t.Etype]], 0))
/* case CASE(OADDR, TPTR32):
a = ALEAL;
break;
case CASE(OADDR, TPTR64):
a = ALEAQ;
break;
*/
// TODO(kaib): make sure the conditional branches work on all edge cases
case gc.OEQ<<16 | gc.TBOOL,
gc.OEQ<<16 | gc.TINT8,
gc.OEQ<<16 | gc.TUINT8,
gc.OEQ<<16 | gc.TINT16,
gc.OEQ<<16 | gc.TUINT16,
gc.OEQ<<16 | gc.TINT32,
gc.OEQ<<16 | gc.TUINT32,
gc.OEQ<<16 | gc.TINT64,
gc.OEQ<<16 | gc.TUINT64,
gc.OEQ<<16 | gc.TPTR32,
gc.OEQ<<16 | gc.TPTR64,
gc.OEQ<<16 | gc.TFLOAT32,
gc.OEQ<<16 | gc.TFLOAT64:
a = arm.ABEQ
case gc.ONE<<16 | gc.TBOOL,
gc.ONE<<16 | gc.TINT8,
gc.ONE<<16 | gc.TUINT8,
gc.ONE<<16 | gc.TINT16,
gc.ONE<<16 | gc.TUINT16,
gc.ONE<<16 | gc.TINT32,
gc.ONE<<16 | gc.TUINT32,
gc.ONE<<16 | gc.TINT64,
gc.ONE<<16 | gc.TUINT64,
gc.ONE<<16 | gc.TPTR32,
gc.ONE<<16 | gc.TPTR64,
gc.ONE<<16 | gc.TFLOAT32,
gc.ONE<<16 | gc.TFLOAT64:
a = arm.ABNE
case gc.OLT<<16 | gc.TINT8,
gc.OLT<<16 | gc.TINT16,
gc.OLT<<16 | gc.TINT32,
gc.OLT<<16 | gc.TINT64,
gc.OLT<<16 | gc.TFLOAT32,
gc.OLT<<16 | gc.TFLOAT64:
a = arm.ABLT
case gc.OLT<<16 | gc.TUINT8,
gc.OLT<<16 | gc.TUINT16,
gc.OLT<<16 | gc.TUINT32,
gc.OLT<<16 | gc.TUINT64:
a = arm.ABLO
case gc.OLE<<16 | gc.TINT8,
gc.OLE<<16 | gc.TINT16,
gc.OLE<<16 | gc.TINT32,
gc.OLE<<16 | gc.TINT64,
gc.OLE<<16 | gc.TFLOAT32,
gc.OLE<<16 | gc.TFLOAT64:
a = arm.ABLE
case gc.OLE<<16 | gc.TUINT8,
gc.OLE<<16 | gc.TUINT16,
gc.OLE<<16 | gc.TUINT32,
gc.OLE<<16 | gc.TUINT64:
a = arm.ABLS
case gc.OGT<<16 | gc.TINT8,
gc.OGT<<16 | gc.TINT16,
gc.OGT<<16 | gc.TINT32,
gc.OGT<<16 | gc.TINT64,
gc.OGT<<16 | gc.TFLOAT32,
gc.OGT<<16 | gc.TFLOAT64:
a = arm.ABGT
case gc.OGT<<16 | gc.TUINT8,
gc.OGT<<16 | gc.TUINT16,
gc.OGT<<16 | gc.TUINT32,
gc.OGT<<16 | gc.TUINT64:
a = arm.ABHI
case gc.OGE<<16 | gc.TINT8,
gc.OGE<<16 | gc.TINT16,
gc.OGE<<16 | gc.TINT32,
gc.OGE<<16 | gc.TINT64,
gc.OGE<<16 | gc.TFLOAT32,
gc.OGE<<16 | gc.TFLOAT64:
a = arm.ABGE
case gc.OGE<<16 | gc.TUINT8,
gc.OGE<<16 | gc.TUINT16,
gc.OGE<<16 | gc.TUINT32,
gc.OGE<<16 | gc.TUINT64:
a = arm.ABHS
case gc.OCMP<<16 | gc.TBOOL,
gc.OCMP<<16 | gc.TINT8,
gc.OCMP<<16 | gc.TUINT8,
gc.OCMP<<16 | gc.TINT16,
gc.OCMP<<16 | gc.TUINT16,
gc.OCMP<<16 | gc.TINT32,
gc.OCMP<<16 | gc.TUINT32,
gc.OCMP<<16 | gc.TPTR32:
a = arm.ACMP
case gc.OCMP<<16 | gc.TFLOAT32:
a = arm.ACMPF
case gc.OCMP<<16 | gc.TFLOAT64:
a = arm.ACMPD
case gc.OAS<<16 | gc.TBOOL:
a = arm.AMOVB
case gc.OAS<<16 | gc.TINT8:
a = arm.AMOVBS
case gc.OAS<<16 | gc.TUINT8:
a = arm.AMOVBU
case gc.OAS<<16 | gc.TINT16:
a = arm.AMOVHS
case gc.OAS<<16 | gc.TUINT16:
a = arm.AMOVHU
case gc.OAS<<16 | gc.TINT32,
gc.OAS<<16 | gc.TUINT32,
gc.OAS<<16 | gc.TPTR32:
a = arm.AMOVW
case gc.OAS<<16 | gc.TFLOAT32:
a = arm.AMOVF
case gc.OAS<<16 | gc.TFLOAT64:
a = arm.AMOVD
case gc.OADD<<16 | gc.TINT8,
gc.OADD<<16 | gc.TUINT8,
gc.OADD<<16 | gc.TINT16,
gc.OADD<<16 | gc.TUINT16,
gc.OADD<<16 | gc.TINT32,
gc.OADD<<16 | gc.TUINT32,
gc.OADD<<16 | gc.TPTR32:
a = arm.AADD
case gc.OADD<<16 | gc.TFLOAT32:
a = arm.AADDF
case gc.OADD<<16 | gc.TFLOAT64:
a = arm.AADDD
case gc.OSUB<<16 | gc.TINT8,
gc.OSUB<<16 | gc.TUINT8,
gc.OSUB<<16 | gc.TINT16,
gc.OSUB<<16 | gc.TUINT16,
gc.OSUB<<16 | gc.TINT32,
gc.OSUB<<16 | gc.TUINT32,
gc.OSUB<<16 | gc.TPTR32:
a = arm.ASUB
case gc.OSUB<<16 | gc.TFLOAT32:
a = arm.ASUBF
case gc.OSUB<<16 | gc.TFLOAT64:
a = arm.ASUBD
case gc.OMINUS<<16 | gc.TINT8,
gc.OMINUS<<16 | gc.TUINT8,
gc.OMINUS<<16 | gc.TINT16,
gc.OMINUS<<16 | gc.TUINT16,
gc.OMINUS<<16 | gc.TINT32,
gc.OMINUS<<16 | gc.TUINT32,
gc.OMINUS<<16 | gc.TPTR32:
a = arm.ARSB
case gc.OAND<<16 | gc.TINT8,
gc.OAND<<16 | gc.TUINT8,
gc.OAND<<16 | gc.TINT16,
gc.OAND<<16 | gc.TUINT16,
gc.OAND<<16 | gc.TINT32,
gc.OAND<<16 | gc.TUINT32,
gc.OAND<<16 | gc.TPTR32:
a = arm.AAND
case gc.OOR<<16 | gc.TINT8,
gc.OOR<<16 | gc.TUINT8,
gc.OOR<<16 | gc.TINT16,
gc.OOR<<16 | gc.TUINT16,
gc.OOR<<16 | gc.TINT32,
gc.OOR<<16 | gc.TUINT32,
gc.OOR<<16 | gc.TPTR32:
a = arm.AORR
case gc.OXOR<<16 | gc.TINT8,
gc.OXOR<<16 | gc.TUINT8,
gc.OXOR<<16 | gc.TINT16,
gc.OXOR<<16 | gc.TUINT16,
gc.OXOR<<16 | gc.TINT32,
gc.OXOR<<16 | gc.TUINT32,
gc.OXOR<<16 | gc.TPTR32:
a = arm.AEOR
case gc.OLSH<<16 | gc.TINT8,
gc.OLSH<<16 | gc.TUINT8,
gc.OLSH<<16 | gc.TINT16,
gc.OLSH<<16 | gc.TUINT16,
gc.OLSH<<16 | gc.TINT32,
gc.OLSH<<16 | gc.TUINT32,
gc.OLSH<<16 | gc.TPTR32:
a = arm.ASLL
case gc.ORSH<<16 | gc.TUINT8,
gc.ORSH<<16 | gc.TUINT16,
gc.ORSH<<16 | gc.TUINT32,
gc.ORSH<<16 | gc.TPTR32:
a = arm.ASRL
case gc.ORSH<<16 | gc.TINT8,
gc.ORSH<<16 | gc.TINT16,
gc.ORSH<<16 | gc.TINT32:
a = arm.ASRA
case gc.OMUL<<16 | gc.TUINT8,
gc.OMUL<<16 | gc.TUINT16,
gc.OMUL<<16 | gc.TUINT32,
gc.OMUL<<16 | gc.TPTR32:
a = arm.AMULU
case gc.OMUL<<16 | gc.TINT8,
gc.OMUL<<16 | gc.TINT16,
gc.OMUL<<16 | gc.TINT32:
a = arm.AMUL
case gc.OMUL<<16 | gc.TFLOAT32:
a = arm.AMULF
case gc.OMUL<<16 | gc.TFLOAT64:
a = arm.AMULD
case gc.ODIV<<16 | gc.TUINT8,
gc.ODIV<<16 | gc.TUINT16,
gc.ODIV<<16 | gc.TUINT32,
gc.ODIV<<16 | gc.TPTR32:
a = arm.ADIVU
case gc.ODIV<<16 | gc.TINT8,
gc.ODIV<<16 | gc.TINT16,
gc.ODIV<<16 | gc.TINT32:
a = arm.ADIV
case gc.OMOD<<16 | gc.TUINT8,
gc.OMOD<<16 | gc.TUINT16,
gc.OMOD<<16 | gc.TUINT32,
gc.OMOD<<16 | gc.TPTR32:
a = arm.AMODU
case gc.OMOD<<16 | gc.TINT8,
gc.OMOD<<16 | gc.TINT16,
gc.OMOD<<16 | gc.TINT32:
a = arm.AMOD
// case CASE(OEXTEND, TINT16):
// a = ACWD;
// break;
// case CASE(OEXTEND, TINT32):
// a = ACDQ;
// break;
// case CASE(OEXTEND, TINT64):
// a = ACQO;
// break;
case gc.ODIV<<16 | gc.TFLOAT32:
a = arm.ADIVF
case gc.ODIV<<16 | gc.TFLOAT64:
a = arm.ADIVD
}
return a
}
const (
ODynam = 1 << 0
OPtrto = 1 << 1
)
var clean [20]gc.Node
var cleani int = 0
func sudoclean() {
if clean[cleani-1].Op != gc.OEMPTY {
regfree(&clean[cleani-1])
}
if clean[cleani-2].Op != gc.OEMPTY {
regfree(&clean[cleani-2])
}
cleani -= 2
}
func dotaddable(n *gc.Node, n1 *gc.Node) bool {
var o int
var oary [10]int64
var nn *gc.Node
if n.Op != gc.ODOT {
return false
}
o = gc.Dotoffset(n, oary[:], &nn)
if nn != nil && nn.Addable != 0 && o == 1 && oary[0] >= 0 {
*n1 = *nn
n1.Type = n.Type
n1.Xoffset += oary[0]
return true
}
return false
}
/*
* generate code to compute address of n,
* a reference to a (perhaps nested) field inside
* an array or struct.
* return 0 on failure, 1 on success.
* on success, leaves usable address in a.
*
* caller is responsible for calling sudoclean
* after successful sudoaddable,
* to release the register used for a.
*/
func sudoaddable(as int, n *gc.Node, a *obj.Addr, w *int) bool {
var o int
var i int
var oary [10]int64
var v int64
var n1 gc.Node
var n2 gc.Node
var n3 gc.Node
var n4 gc.Node
var nn *gc.Node
var l *gc.Node
var r *gc.Node
var reg *gc.Node
var reg1 *gc.Node
var p1 *obj.Prog
var p2 *obj.Prog
var t *gc.Type
if n.Type == nil {
return false
}
*a = obj.Addr{}
switch n.Op {
case gc.OLITERAL:
if !gc.Isconst(n, gc.CTINT) {
break
}
v = gc.Mpgetfix(n.Val.U.Xval)
if v >= 32000 || v <= -32000 {
break
}
goto lit
case gc.ODOT,
gc.ODOTPTR:
cleani += 2
reg = &clean[cleani-1]
reg1 = &clean[cleani-2]
reg.Op = gc.OEMPTY
reg1.Op = gc.OEMPTY
goto odot
case gc.OINDEX:
return false
// disabled: OINDEX case is now covered by agenr
// for a more suitable register allocation pattern.
if n.Left.Type.Etype == gc.TSTRING {
return false
}
cleani += 2
reg = &clean[cleani-1]
reg1 = &clean[cleani-2]
reg.Op = gc.OEMPTY
reg1.Op = gc.OEMPTY
goto oindex
}
return false
lit:
switch as {
default:
return false
case arm.AADD,
arm.ASUB,
arm.AAND,
arm.AORR,
arm.AEOR,
arm.AMOVB,
arm.AMOVBS,
arm.AMOVBU,
arm.AMOVH,
arm.AMOVHS,
arm.AMOVHU,
arm.AMOVW:
break
}
cleani += 2
reg = &clean[cleani-1]
reg1 = &clean[cleani-2]
reg.Op = gc.OEMPTY
reg1.Op = gc.OEMPTY
gc.Naddr(n, a, 1)
goto yes
odot:
o = gc.Dotoffset(n, oary[:], &nn)
if nn == nil {
goto no
}
if nn.Addable != 0 && o == 1 && oary[0] >= 0 {
// directly addressable set of DOTs
n1 = *nn
n1.Type = n.Type
n1.Xoffset += oary[0]
gc.Naddr(&n1, a, 1)
goto yes
}
regalloc(reg, gc.Types[gc.Tptr], nil)
n1 = *reg
n1.Op = gc.OINDREG
if oary[0] >= 0 {
agen(nn, reg)
n1.Xoffset = oary[0]
} else {
cgen(nn, reg)
gc.Cgen_checknil(reg)
n1.Xoffset = -(oary[0] + 1)
}
for i = 1; i < o; i++ {
if oary[i] >= 0 {
gc.Fatal("can't happen")
}
gins(arm.AMOVW, &n1, reg)
gc.Cgen_checknil(reg)
n1.Xoffset = -(oary[i] + 1)
}
a.Type = obj.TYPE_NONE
a.Name = obj.NAME_NONE
n1.Type = n.Type
gc.Naddr(&n1, a, 1)
goto yes
oindex:
l = n.Left
r = n.Right
if l.Ullman >= gc.UINF && r.Ullman >= gc.UINF {
goto no
}
// set o to type of array
o = 0
if gc.Isptr[l.Type.Etype] != 0 {
o += OPtrto
if l.Type.Type.Etype != gc.TARRAY {
gc.Fatal("not ptr ary")
}
if l.Type.Type.Bound < 0 {
o += ODynam
}
} else {
if l.Type.Etype != gc.TARRAY {
gc.Fatal("not ary")
}
if l.Type.Bound < 0 {
o += ODynam
}
}
*w = int(n.Type.Width)
if gc.Isconst(r, gc.CTINT) {
goto oindex_const
}
switch *w {
default:
goto no
case 1,
2,
4,
8:
break
}
// load the array (reg)
if l.Ullman > r.Ullman {
regalloc(reg, gc.Types[gc.Tptr], nil)
if o&OPtrto != 0 {
cgen(l, reg)
gc.Cgen_checknil(reg)
} else {
agen(l, reg)
}
}
// load the index (reg1)
t = gc.Types[gc.TUINT32]
if gc.Issigned[r.Type.Etype] != 0 {
t = gc.Types[gc.TINT32]
}
regalloc(reg1, t, nil)
regalloc(&n3, gc.Types[gc.TINT32], reg1)
p2 = cgenindex(r, &n3, gc.Debug['B'] != 0 || n.Bounded)
gmove(&n3, reg1)
regfree(&n3)
// load the array (reg)
if l.Ullman <= r.Ullman {
regalloc(reg, gc.Types[gc.Tptr], nil)
if o&OPtrto != 0 {
cgen(l, reg)
gc.Cgen_checknil(reg)
} else {
agen(l, reg)
}
}
// check bounds
if gc.Debug['B'] == 0 {
if o&ODynam != 0 {
n2 = *reg
n2.Op = gc.OINDREG
n2.Type = gc.Types[gc.Tptr]
n2.Xoffset = int64(gc.Array_nel)
} else {
if o&OPtrto != 0 {
gc.Nodconst(&n2, gc.Types[gc.TUINT32], l.Type.Type.Bound)
} else {
gc.Nodconst(&n2, gc.Types[gc.TUINT32], l.Type.Bound)
}
}
regalloc(&n3, n2.Type, nil)
cgen(&n2, &n3)
gcmp(optoas(gc.OCMP, gc.Types[gc.TUINT32]), reg1, &n3)
regfree(&n3)
p1 = gc.Gbranch(optoas(gc.OLT, gc.Types[gc.TUINT32]), nil, +1)
if p2 != nil {
gc.Patch(p2, gc.Pc)
}
ginscall(gc.Panicindex, 0)
gc.Patch(p1, gc.Pc)
}
if o&ODynam != 0 {
n2 = *reg
n2.Op = gc.OINDREG
n2.Type = gc.Types[gc.Tptr]
n2.Xoffset = int64(gc.Array_array)
gmove(&n2, reg)
}
switch *w {
case 1:
gins(arm.AADD, reg1, reg)
case 2:
gshift(arm.AADD, reg1, arm.SHIFT_LL, 1, reg)
case 4:
gshift(arm.AADD, reg1, arm.SHIFT_LL, 2, reg)
case 8:
gshift(arm.AADD, reg1, arm.SHIFT_LL, 3, reg)
}
gc.Naddr(reg1, a, 1)
a.Type = obj.TYPE_MEM
a.Reg = reg.Val.U.Reg
a.Offset = 0
goto yes
// index is constant
// can check statically and
// can multiply by width statically
oindex_const:
regalloc(reg, gc.Types[gc.Tptr], nil)
if o&OPtrto != 0 {
cgen(l, reg)
gc.Cgen_checknil(reg)
} else {
agen(l, reg)
}
v = gc.Mpgetfix(r.Val.U.Xval)
if o&ODynam != 0 {
if gc.Debug['B'] == 0 && !n.Bounded {
n1 = *reg
n1.Op = gc.OINDREG
n1.Type = gc.Types[gc.Tptr]
n1.Xoffset = int64(gc.Array_nel)
gc.Nodconst(&n2, gc.Types[gc.TUINT32], v)
regalloc(&n3, gc.Types[gc.TUINT32], nil)
cgen(&n2, &n3)
regalloc(&n4, n1.Type, nil)
cgen(&n1, &n4)
gcmp(optoas(gc.OCMP, gc.Types[gc.TUINT32]), &n4, &n3)
regfree(&n4)
regfree(&n3)
p1 = gc.Gbranch(optoas(gc.OGT, gc.Types[gc.TUINT32]), nil, +1)
ginscall(gc.Panicindex, 0)
gc.Patch(p1, gc.Pc)
}
n1 = *reg
n1.Op = gc.OINDREG
n1.Type = gc.Types[gc.Tptr]
n1.Xoffset = int64(gc.Array_array)
gmove(&n1, reg)
}
n2 = *reg
n2.Op = gc.OINDREG
n2.Xoffset = v * int64(*w)
a.Type = obj.TYPE_NONE
a.Name = obj.NAME_NONE
gc.Naddr(&n2, a, 1)
goto yes
yes:
return true
no:
sudoclean()
return false
}