cmd/compile: reorganize SSA register numbering
Teach SSA about the cmd/internal/obj/$ARCH register numbering.
It can then return that numbering when requested. Each architecture
now does not need to know anything about the internal SSA numbering
of registers.
Change-Id: I34472a2736227c15482e60994eebcdd2723fa52d
Reviewed-on: https://go-review.googlesource.com/29249
Reviewed-by: David Chase <drchase@google.com>
diff --git a/src/cmd/compile/internal/ssa/value.go b/src/cmd/compile/internal/ssa/value.go
index 62213a5..71955aa 100644
--- a/src/cmd/compile/internal/ssa/value.go
+++ b/src/cmd/compile/internal/ssa/value.go
@@ -268,3 +268,38 @@
func (s *AutoSymbol) String() string {
return s.Node.String()
}
+
+// Reg returns the register assigned to v, in cmd/internal/obj/$ARCH numbering.
+func (v *Value) Reg() int16 {
+ reg := v.Block.Func.RegAlloc[v.ID]
+ if reg == nil {
+ v.Fatalf("nil register for value: %s\n%s\n", v.LongString(), v.Block.Func)
+ }
+ return reg.(*Register).objNum
+}
+
+// Reg0 returns the register assigned to the first output of v, in cmd/internal/obj/$ARCH numbering.
+func (v *Value) Reg0() int16 {
+ reg := v.Block.Func.RegAlloc[v.ID].(LocPair)[0]
+ if reg == nil {
+ v.Fatalf("nil first register for value: %s\n%s\n", v.LongString(), v.Block.Func)
+ }
+ return reg.(*Register).objNum
+}
+
+// Reg1 returns the register assigned to the second output of v, in cmd/internal/obj/$ARCH numbering.
+func (v *Value) Reg1() int16 {
+ reg := v.Block.Func.RegAlloc[v.ID].(LocPair)[1]
+ if reg == nil {
+ v.Fatalf("nil second register for value: %s\n%s\n", v.LongString(), v.Block.Func)
+ }
+ return reg.(*Register).objNum
+}
+
+func (v *Value) RegName() string {
+ reg := v.Block.Func.RegAlloc[v.ID]
+ if reg == nil {
+ v.Fatalf("nil register for value: %s\n%s\n", v.LongString(), v.Block.Func)
+ }
+ return reg.(*Register).name
+}
