[dev.ssa] cmd/compile: implement OGETG
Change-Id: I7ecf62cf399c710b4a617803c43e83fce09b8a7d
Reviewed-on: https://go-review.googlesource.com/13585
Reviewed-by: Keith Randall <khr@golang.org>
diff --git a/src/cmd/compile/internal/gc/ssa.go b/src/cmd/compile/internal/gc/ssa.go
index 0086fec..c8ec01f 100644
--- a/src/cmd/compile/internal/gc/ssa.go
+++ b/src/cmd/compile/internal/gc/ssa.go
@@ -1340,6 +1340,10 @@
}
a := s.entryNewValue1I(ssa.OpOffPtr, Ptrto(fp.Type), fp.Width, s.sp)
return s.newValue2(ssa.OpLoad, fp.Type, a, call)
+
+ case OGETG:
+ return s.newValue0(ssa.OpGetG, n.Type)
+
default:
s.Unimplementedf("unhandled expr %s", opnames[n.Op])
return nil
@@ -2185,6 +2189,33 @@
q.From.Reg = x86.REG_AX
q.To.Type = obj.TYPE_MEM
q.To.Reg = x86.REG_AX
+ case ssa.OpAMD64LoweredGetG:
+ r := regnum(v)
+ // See the comments in cmd/internal/obj/x86/obj6.go
+ // near CanUse1InsnTLS for a detailed explanation of these instructions.
+ if x86.CanUse1InsnTLS(Ctxt) {
+ // MOVQ (TLS), r
+ p := Prog(x86.AMOVQ)
+ p.From.Type = obj.TYPE_MEM
+ p.From.Reg = x86.REG_TLS
+ p.To.Type = obj.TYPE_REG
+ p.To.Reg = r
+ } else {
+ // MOVQ TLS, r
+ // MOVQ (r)(TLS*1), r
+ p := Prog(x86.AMOVQ)
+ p.From.Type = obj.TYPE_REG
+ p.From.Reg = x86.REG_TLS
+ p.To.Type = obj.TYPE_REG
+ p.To.Reg = r
+ q := Prog(x86.AMOVQ)
+ q.From.Type = obj.TYPE_MEM
+ q.From.Reg = r
+ q.From.Index = x86.REG_TLS
+ q.From.Scale = 1
+ q.To.Type = obj.TYPE_REG
+ q.To.Reg = r
+ }
case ssa.OpAMD64CALLstatic:
p := Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM
