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cmd/internal/obj/arm64: rewrite branches that are too far

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Fixes #12540.

Change-Id: I7893fdc023145b0aca4b4c7df7e08e47edcf5bba
Reviewed-on: https://go-review.googlesource.com/16902
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
This commit is contained in:
Shenghou Ma 2015-11-12 21:23:21 -05:00 committed by Minux Ma
parent ec9aae772c
commit 2a031e6a2a
1 changed files with 31 additions and 31 deletions
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62
src/cmd/internal/obj/arm64/asm7.go
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@ -535,9 +535,9 @@ func span7(ctxt *obj.Link, cursym *obj.LSym) {
buildop(ctxt)
}
bflag := 0
c := int32(0)
p.Pc = int64(c)
bflag := 1
c := int64(0)
p.Pc = c
var m int
var o *Optab
for p = p.Link; p != nil; p = p.Link {
@ -545,7 +545,7 @@ func span7(ctxt *obj.Link, cursym *obj.LSym) {
if p.As == ADWORD && (c&7) != 0 {
c += 4
}
p.Pc = int64(c)
p.Pc = c
o = oplook(ctxt, p)
m = int(o.size)
if m == 0 {
@ -567,13 +567,13 @@ func span7(ctxt *obj.Link, cursym *obj.LSym) {
if p.As == AB || p.As == obj.ARET || p.As == AERET { /* TODO: other unconditional operations */
checkpool(ctxt, p, 0)
}
c += int32(m)
c += int64(m)
if ctxt.Blitrl != nil {
checkpool(ctxt, p, 1)
}
}
cursym.Size = int64(c)
cursym.Size = c
/*
* if any procedure is large enough to
@ -582,38 +582,38 @@ func span7(ctxt *obj.Link, cursym *obj.LSym) {
* around jmps to fix. this is rare.
*/
for bflag != 0 {
if ctxt.Debugvlog != 0 {
fmt.Fprintf(ctxt.Bso, "%5.2f span1\n", obj.Cputime())
}
bflag = 0
c = 0
for p = cursym.Text; p != nil; p = p.Link {
for p = cursym.Text.Link; p != nil; p = p.Link {
if p.As == ADWORD && (c&7) != 0 {
c += 4
}
p.Pc = int64(c)
p.Pc = c
o = oplook(ctxt, p)
/* very large branches
if(o->type == 6 && p->cond) {
otxt = p->cond->pc - c;
if(otxt < 0)
otxt = -otxt;
if(otxt >= (1L<<17) - 10) {
q = ctxt->arch->prg();
q->link = p->link;
p->link = q;
q->as = AB;
q->to.type = obj.TYPE_BRANCH;
q->cond = p->cond;
p->cond = q;
q = ctxt->arch->prg();
q->link = p->link;
p->link = q;
q->as = AB;
q->to.type = obj.TYPE_BRANCH;
q->cond = q->link->link;
bflag = 1;
/* very large branches */
if o.type_ == 7 && p.Pcond != nil {
otxt := p.Pcond.Pc - c
if otxt <= -(1<<18)+10 || otxt >= (1<<18)-10 {
q := ctxt.NewProg()
q.Link = p.Link
p.Link = q
q.As = AB
q.To.Type = obj.TYPE_BRANCH
q.Pcond = p.Pcond
p.Pcond = q
q = ctxt.NewProg()
q.Link = p.Link
p.Link = q
q.As = AB
q.To.Type = obj.TYPE_BRANCH
q.Pcond = q.Link.Link
bflag = 1
}
}
*/
m = int(o.size)
if m == 0 {
@ -623,12 +623,12 @@ func span7(ctxt *obj.Link, cursym *obj.LSym) {
continue
}
c += int32(m)
c += int64(m)
}
}
c += -c & (FuncAlign - 1)
cursym.Size = int64(c)
cursym.Size = c
/*
* lay out the code, emitting code and data relocations.