diff --git a/projects/rccl/src/collectives/collectives.h b/projects/rccl/src/collectives/collectives.h
index c56d90888e..63fcfd2017 100644
--- a/projects/rccl/src/collectives/collectives.h
+++ b/projects/rccl/src/collectives/collectives.h
@@ -9,7 +9,7 @@
 #ifndef NCCL_COLLECTIVES_H_
 #define NCCL_COLLECTIVES_H_
 
-#define FUNC_INDEX(coll, redop, dtype, ll, al) ((((coll*ncclNumOps + redop)*ncclNumTypes) + dtype)*2+ll)
+#define FUNC_INDEX(coll, redop, dtype, ll, al) ((((((coll)*ncclNumOps + (redop))*ncclNumTypes) + (dtype))*2+(al))*2+(ll))
 
 #define NCCL_COLL_NAME(coll, op, dtype) \
   coll##_##op##_##dtype
@@ -27,7 +27,8 @@
   DECL_COLL5(coll##LL, op, dtype)
 
 #define DECL_COLL3(coll, op, dtype) \
-  DECL_COLL4(coll##Ring, op, dtype)
+  DECL_COLL4(coll##Ring, op, dtype) \
+  DECL_COLL4(coll##Tree, op, dtype)
 
 #define DECL_COLL2(coll, op) \
   DECL_COLL3(coll, op, i8) \
diff --git a/projects/rccl/src/collectives/device/common.h b/projects/rccl/src/collectives/device/common.h
index 2086c1c057..863198180e 100644
--- a/projects/rccl/src/collectives/device/common.h
+++ b/projects/rccl/src/collectives/device/common.h
@@ -40,7 +40,8 @@ static inline __device__ void exitIfAbortBarrier(int abort) {
   NCCL_COLL_NAME(coll##LL, op, dtype)
 
 #define NCCL_FUNC4(coll, op, dtype) \
-  NCCL_FUNC5(coll##Ring, op, dtype)
+  NCCL_FUNC5(coll##Ring, op, dtype), \
+  NCCL_FUNC5(coll##Tree, op, dtype)
 
 // Must be consistent with ncclDataType_t
 #define NCCL_FUNCS3A(coll, op) \
@@ -120,16 +121,20 @@ struct Caller<f, f + 1>{
 inline
 __device__
 void NCCL_CALL_FUNCTIONS(struct ncclColl* const c) noexcept {
-  if (c->funcIndex < 72) {
-    if (c->funcIndex % 2) ncclBroadcastRingLL_copy_i8(&c->args);
-    else ncclBroadcastRing_copy_i8(&c->args);
+  if (c->funcIndex < 144) {
+    if (c->funcIndex % 4 == 0) ncclBroadcastRing_copy_i8(&c->args);
+    else if (c->funcIndex % 4 == 1) ncclBroadcastRingLL_copy_i8(&c->args);
+    else if (c->funcIndex % 4 == 2) ncclBroadcastTree_copy_i8(&c->args);
+    else ncclBroadcastTreeLL_copy_i8(&c->args);
   }
-  else if (c->funcIndex < 144) Caller<72, 144>::call(c);
-  else if (c->funcIndex < 216) {
-    if (c->funcIndex % 2) ncclAllGatherRingLL_copy_i8(&c->args);
-    else ncclAllGatherRing_copy_i8(&c->args);
+  else if (c->funcIndex < 288) Caller<144, 288>::call(c);
+  else if (c->funcIndex < 432) {
+    if (c->funcIndex % 4 == 0) ncclAllGatherRing_copy_i8(&c->args);
+    else if (c->funcIndex % 4 == 1) ncclAllGatherRingLL_copy_i8(&c->args);
+    else if (c->funcIndex % 4 == 2) ncclAllGatherTree_copy_i8(&c->args);
+    else ncclAllGatherTreeLL_copy_i8(&c->args);
   }
-  else Caller<216, 360>::call(c);
+  else Caller<432, 720>::call(c);
 }
 
 static __device__ void load_parallel(void* dst, void* src, size_t size, int tid, uint32_t* abortCount) {
@@ -210,7 +215,8 @@ __global__ void NCCL_KERN_NAME(coll, op, dtype)(struct ncclColl firstColl) { \
   IMPL_COLL_KERN_##op(coll##LL, op, ncclFunc, dtype, ctype, FUNC_INDEX(ncclColl, ncclOp, ncclType, 1, al)) \
 
 #define IMPL_COLL3(coll, op, ncclFunc, dtype, ctype, ncclColl, ncclOp, ncclType) \
-  IMPL_COLL4(coll##Ring, op, ncclFunc, dtype, ctype, ncclColl, ncclOp, ncclType, 0)
+  IMPL_COLL4(coll##Ring, op, ncclFunc, dtype, ctype, ncclColl, ncclOp, ncclType, 0) \
+  IMPL_COLL4(coll##Tree, op, ncclFunc, dtype, ctype, ncclColl, ncclOp, ncclType, 1)
 
 #define IMPL_COLL2(coll, op, ncclFunc, ncclColl, ncclOp) \
   IMPL_COLL3(coll, op, ncclFunc, i8,  int8_t,   ncclColl, ncclOp, ncclInt8) \
diff --git a/projects/rccl/src/enqueue.cc b/projects/rccl/src/enqueue.cc
index 0c7b897ec4..a6eb484d4e 100644
--- a/projects/rccl/src/enqueue.cc
+++ b/projects/rccl/src/enqueue.cc
@@ -17,7 +17,8 @@
   NCCL_KERN_NAME(coll##LL, op, dtype)
 
 #define NCCL_FUNC4(coll, op, dtype) \
-  NCCL_FUNC5(coll##Ring, op, dtype)
+  NCCL_FUNC5(coll##Ring, op, dtype), \
+  NCCL_FUNC5(coll##Tree, op, dtype)
 
 // Must be consistent with ncclDataType_t
 #define NCCL_FUNCS3A(coll, op) \
@@ -55,7 +56,7 @@
 
 typedef void(*ncclKern_t)(struct ncclColl);
 // Must be consistent with the ncclFuncSet enum
-static ncclKern_t const ncclKerns[ncclCollCount*ncclNumOps*ncclNumTypes*2] = {
+static ncclKern_t const ncclKerns[ncclCollCount*ncclNumOps*ncclNumTypes*2*2] = {
   NCCL_FUNCS2B(ncclBroadcast),
   NCCL_FUNCS2A(ncclReduce),
   NCCL_FUNCS2B(ncclAllGather),