internal/runtime/maps: removed unused convertNonFullToEmptyAndFullToDeleted

I don't think we have any code that uses this function.
Unless it is something for the future.

Change-Id: I7e44634f7a9c1d4d64d84c358447ccf213668d92
Reviewed-on: https://go-review.googlesource.com/c/go/+/622077
Reviewed-by: Keith Randall <khr@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

diff --git a/src/internal/runtime/maps/group.go b/src/internal/runtime/maps/group.go
index 48527629ae1afb6c29c733a4264a6b9b88ac1151..3e06a534ab7ed203ffde4e3dd08ba4a61843b48f 100644 (file)
--- a/src/internal/runtime/maps/group.go
+++ b/src/internal/runtime/maps/group.go
@@ -124,33 +124,6 @@ func (g ctrlGroup) matchEmptyOrDeleted() bitset {
        return bitset(v & bitsetMSB)
 }
 
-// convertNonFullToEmptyAndFullToDeleted converts deleted control bytes in a
-// group to empty control bytes, and control bytes indicating full slots to
-// deleted control bytes.
-func (g *ctrlGroup) convertNonFullToEmptyAndFullToDeleted() {
-       // An empty slot is     1000 0000
-       // A deleted slot is    1111 1110
-       // A full slot is       0??? ????
-       //
-       // We select the MSB, invert, add 1 if the MSB was set and zero out the low
-       // bit.
-       //
-       //  - if the MSB was set (i.e. slot was empty, or deleted):
-       //     v:             1000 0000
-       //     ^v:            0111 1111
-       //     ^v + (v >> 7): 1000 0000
-       //     &^ bitsetLSB:  1000 0000 = empty slot.
-       //
-       // - if the MSB was not set (i.e. full slot):
-       //     v:             0000 0000
-       //     ^v:            1111 1111
-       //     ^v + (v >> 7): 1111 1111
-       //     &^ bitsetLSB:  1111 1110 = deleted slot.
-       //
-       v := uint64(*g) & bitsetMSB
-       *g = ctrlGroup((^v + (v >> 7)) &^ bitsetLSB)
-}
-
 // groupReference is a wrapper type representing a single slot group stored at
 // data.
 //