cmd/gc: allocate backing storage for non-escaping interfaces on stack
Extend escape analysis to convT2E and conT2I. If the interface value
does not escape supply runtime with a stack buffer for the object copy.
This is a straight port from .c to .go of Dmitry's patch
Change-Id: Ic315dd50d144d94dd3324227099c116be5ca70b6
Reviewed-on: https://go-review.googlesource.com/8201
Reviewed-by: Dmitry Vyukov <dvyukov@google.com>
diff --git a/src/cmd/internal/gc/builtin/runtime.go b/src/cmd/internal/gc/builtin/runtime.go
index 554d787..0cf1fb2 100644
--- a/src/cmd/internal/gc/builtin/runtime.go
+++ b/src/cmd/internal/gc/builtin/runtime.go
@@ -63,8 +63,8 @@
func typ2Itab(typ *byte, typ2 *byte, cache **byte) (ret *byte)
func convI2E(elem any) (ret any)
func convI2I(typ *byte, elem any) (ret any)
-func convT2E(typ *byte, elem *any) (ret any)
-func convT2I(typ *byte, typ2 *byte, cache **byte, elem *any) (ret any)
+func convT2E(typ *byte, elem, buf *any) (ret any)
+func convT2I(typ *byte, typ2 *byte, cache **byte, elem, buf *any) (ret any)
// interface type assertions x.(T)
func assertE2E(typ *byte, iface any, ret *any)
