cmd/internal/gc, cmd/internal/ld, cmd/internal/obj: teach compiler about local symbols
This lets us avoid loading string constants via the GOT and (together with
http://golang.org/cl/9102) results in the fannkuch benchmark having very similar
register usage with -dynlink as without.
Change-Id: Ic3892b399074982b76773c3e547cfbba5dabb6f9
Reviewed-on: https://go-review.googlesource.com/9103
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
diff --git a/src/cmd/internal/gc/gsubr.go b/src/cmd/internal/gc/gsubr.go
index 1f6b7d2..53b3f6c 100644
--- a/src/cmd/internal/gc/gsubr.go
+++ b/src/cmd/internal/gc/gsubr.go
@@ -218,11 +218,15 @@
}
}
-func ggloblsym(s *Sym, width int32, flags int8) {
+func ggloblsym(s *Sym, width int32, flags int16) {
p := Thearch.Gins(obj.AGLOBL, nil, nil)
p.From.Type = obj.TYPE_MEM
p.From.Name = obj.NAME_EXTERN
p.From.Sym = Linksym(s)
+ if flags&obj.LOCAL != 0 {
+ p.From.Sym.Local = true
+ flags &= ^obj.LOCAL
+ }
p.To.Type = obj.TYPE_CONST
p.To.Offset = int64(width)
p.From3.Offset = int64(flags)
