compiler: make use of specialized fast map routines

    
    In the runtime there are specialized fast map routines for
    certain kep types. This CL lets the compiler make use of these
    functions, instead of always using the generic ones.
    
    As we now generate multiple versions of map delete calls, to make
    things easier we delay the expansion of the built-in delete
    function to flatten phase.
    
    Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/180858

From-SVN: r271983

3 files changed, 26 insertions, 0 deletions

diff --git a/libgo/go/runtime/map_fast32.go b/libgo/go/runtime/map_fast32.go
index 1fa5cd9..07a35e1 100644
--- a/libgo/go/runtime/map_fast32.go
+++ b/libgo/go/runtime/map_fast32.go
@@ -9,6 +9,15 @@ import (
 	"unsafe"
 )
 
+// For gccgo, use go:linkname to rename compiler-called functions to
+// themselves, so that the compiler will export them.
+//
+//go:linkname mapaccess1_fast32 runtime.mapaccess1_fast32
+//go:linkname mapaccess2_fast32 runtime.mapaccess2_fast32
+//go:linkname mapassign_fast32 runtime.mapassign_fast32
+//go:linkname mapassign_fast32ptr runtime.mapassign_fast32ptr
+//go:linkname mapdelete_fast32 runtime.mapdelete_fast32
+
 func mapaccess1_fast32(t *maptype, h *hmap, key uint32) unsafe.Pointer {
 	if raceenabled && h != nil {
 		callerpc := getcallerpc()
diff --git a/libgo/go/runtime/map_fast64.go b/libgo/go/runtime/map_fast64.go
index d23ac23..d21bf06 100644
--- a/libgo/go/runtime/map_fast64.go
+++ b/libgo/go/runtime/map_fast64.go
@@ -9,6 +9,15 @@ import (
 	"unsafe"
 )
 
+// For gccgo, use go:linkname to rename compiler-called functions to
+// themselves, so that the compiler will export them.
+//
+//go:linkname mapaccess1_fast64 runtime.mapaccess1_fast64
+//go:linkname mapaccess2_fast64 runtime.mapaccess2_fast64
+//go:linkname mapassign_fast64 runtime.mapassign_fast64
+//go:linkname mapassign_fast64ptr runtime.mapassign_fast64ptr
+//go:linkname mapdelete_fast64 runtime.mapdelete_fast64
+
 func mapaccess1_fast64(t *maptype, h *hmap, key uint64) unsafe.Pointer {
 	if raceenabled && h != nil {
 		callerpc := getcallerpc()
diff --git a/libgo/go/runtime/map_faststr.go b/libgo/go/runtime/map_faststr.go
index eced15a..083980f 100644
--- a/libgo/go/runtime/map_faststr.go
+++ b/libgo/go/runtime/map_faststr.go
@@ -9,6 +9,14 @@ import (
 	"unsafe"
 )
 
+// For gccgo, use go:linkname to rename compiler-called functions to
+// themselves, so that the compiler will export them.
+//
+//go:linkname mapaccess1_faststr runtime.mapaccess1_faststr
+//go:linkname mapaccess2_faststr runtime.mapaccess2_faststr
+//go:linkname mapassign_faststr runtime.mapassign_faststr
+//go:linkname mapdelete_faststr runtime.mapdelete_faststr
+
 func mapaccess1_faststr(t *maptype, h *hmap, ky string) unsafe.Pointer {
 	if raceenabled && h != nil {
 		callerpc := getcallerpc()