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cmd/internal/obj: make arm64 use RegTo2 instead of a full fledged Addr To2

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It shrinks Prog type from 448 bytes down to 376 bytes on amd64.

It also makes sense, because I don't know of any modern architecture
that have instructions which can write to two destinations, none of
which is a register (even x86 doesn't have such instructions).

Change-Id: I3061f1c9ac93d79ee2b92ecb9049641d0e0f6300
Reviewed-on: https://go-review.googlesource.com/10330
Reviewed-by: Aram Hăvărneanu <aram@mgk.ro>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Shenghou Ma 2015-05-21 17:51:34 -04:00 committed by Minux Ma
parent 4e4c1f9c4d
commit 0f27b91522
6 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
src/cmd/asm/internal/asm/asm.go
View File

@ -493,7 +493,10 @@ func (p *Parser) asmInstruction(op int, cond string, a []obj.Addr) {
if arch.IsARM64STLXR(op) {
prog.From = a[0]
prog.To = a[1]
prog.To2 = a[2]
if a[2].Type != obj.TYPE_REG {
p.errorf("invalid addressing modes for third operand to %s instruction, must be register", obj.Aconv(op))
}
prog.RegTo2 = a[2].Reg
break
}
prog.From = a[0]

4
src/cmd/compile/internal/arm64/peep.go
View File

@ -422,9 +422,9 @@ func copyu(p *obj.Prog, v *obj.Addr, s *obj.Addr) int {
// 7g never generates a from3
fmt.Printf("copyu: from3 (%v) not implemented\n", gc.Ctxt.Dconv(&p.From3))
}
if p.To2.Type != obj.TYPE_NONE {
if p.RegTo2 != obj.REG_NONE {
// 7g never generates a to2
fmt.Printf("copyu: to2 (%v) not implemented\n", gc.Ctxt.Dconv(&p.To2))
fmt.Printf("copyu: RegTo2 (%v) not implemented\n", obj.Rconv(int(p.RegTo2)))
}
switch p.As {

4
src/cmd/internal/obj/arm64/asm7.go
View File

@ -2677,8 +2677,8 @@ func asmout(ctxt *obj.Link, p *obj.Prog, o *Optab, out []uint32) {
case 59: /* stxr/stlxr */
o1 = opstore(ctxt, int(p.As))
if p.To2.Type != obj.TYPE_NONE {
o1 |= uint32(p.To2.Reg&31) << 16
if p.RegTo2 != obj.REG_NONE {
o1 |= uint32(p.RegTo2&31) << 16
} else {
o1 |= 0x1F << 16
}

2
src/cmd/internal/obj/link.go
View File

@ -206,7 +206,6 @@ type Prog struct {
From Addr
From3 Addr
To Addr
To2 Addr
Opt interface{}
Forwd *Prog
Pcond *Prog
@ -217,6 +216,7 @@ type Prog struct {
Spadj int32
As int16
Reg int16
RegTo2 int16 // 2nd register output operand
Mark uint16
Optab uint16
Scond uint8

4
src/cmd/internal/obj/util.go
View File

@ -327,8 +327,8 @@ func (p *Prog) String() string {
if p.To.Type != TYPE_NONE {
fmt.Fprintf(&buf, "%s%v", sep, Dconv(p, &p.To))
}
if p.To2.Type != TYPE_NONE {
fmt.Fprintf(&buf, "%s%v", sep, Dconv(p, &p.To2))
if p.RegTo2 != REG_NONE {
fmt.Fprintf(&buf, "%s%v", sep, Rconv(int(p.RegTo2)))
}
return buf.String()
}

3
src/cmd/internal/obj/x86/obj6.go
View File

@ -350,9 +350,6 @@ func progedit(ctxt *obj.Link, p *obj.Prog) {
if p.From3.Name == obj.NAME_EXTERN {
ctxt.Diag("don't know how to handle %v with -dynlink", p)
}
if p.To2.Name == obj.NAME_EXTERN {
ctxt.Diag("don't know how to handle %v with -dynlink", p)
}
var source *obj.Addr
if p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local {
if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local {