Merge pull request #2669 from NVIDIA/421_update

4.2.1 update

CHANGELOG.md

@@ -2,6 +2,21 @@
 
 # CUTLASS 4.x
 
+# CUTLASS 4.2.1
+## [4.2.1](https://github.com/NVIDIA/cutlass/releases/tag/v4.2.1) (2025-09-22)
+
+### CuTe DSL
+* Bug fixings and improvements
+    - Fixed an issue when running DSL codes with cuda-python 13.0
+    - Fixed an issue when running inductor with DSL codes
+    - Fixed an issue with unexpected logging when running DSL codes in FlashInfer
+    - Fixed the issue reported in https://github.com/NVIDIA/cutlass/issues/2647
+    - Fixed an issue when conditional define of variables outside of dynamic control flow
+
+### CUTLASS C++
+* Bypass EVT for nosmem blockwise kernels on Blackwell.
+* Rename cutlass/python/cutlass directory to cutlass/python/cutlass_cppgen.
+
 ## [4.2.0](https://github.com/NVIDIA/cutlass/releases/tag/v4.2.0) (2025-09-15)
 
 ### CuTe DSL

README.md

@@ -1,9 +1,9 @@
 ![ALT](./media/images/gemm-hierarchy-with-epilogue-no-labels.png "Complete CUDA GEMM decomposition")
 # Overview
 
-# CUTLASS 4.2.0
+# CUTLASS 4.2.1
 
-_CUTLASS 4.2.0 - Sept 2025_
+_CUTLASS 4.2.1 - Sept 2025_
 
 CUTLASS is a collection of abstractions for implementing high-performance matrix-matrix multiplication (GEMM)
 and related computations at all levels and scales within CUDA. It incorporates strategies for
@@ -224,7 +224,10 @@ CUTLASS runs successfully on the following NVIDIA GPUs, and it is expected to be
 |NVIDIA H100 Tensor Core GPU            |9.0|11.8|
 |NVIDIA H200 Tensor Core GPU            |9.0|11.8|
 |NVIDIA B200 Tensor Core GPU            |10.0|12.8|
+|NVIDIA B300 Tensor Core GPU            |10.3|13.0|
+|NVIDIA DRIVE Thor                      |11.0|13.0|
 |NVIDIA GeForce RTX 50x0 series         |12.0|12.8|
+|NVIDIA DGX Spark                       |12.1|13.0|
 
 ## Target Architecture
 

include/cutlass/version.h

@@ -36,7 +36,7 @@
 
 #define CUTLASS_MAJOR 4
 #define CUTLASS_MINOR 2
-#define CUTLASS_PATCH 0 
+#define CUTLASS_PATCH 1
 
 #ifdef CUTLASS_VERSIONS_GENERATED
 #include "cutlass/version_extended.h"

python/cutlass_cppgen/__init__.py

@@ -133,7 +133,7 @@ def get_option_registry():
         this._option_registry = OptionRegistry(device_cc())
     return this._option_registry
 
-this.__version__ = '4.2.0'
+this.__version__ = '4.2.1'
 
 from cutlass_cppgen.backend import create_memory_pool
 from cutlass_cppgen.emit.pytorch import pytorch

python/setup_library.py

@@ -36,7 +36,7 @@ from setuptools import setup
 def perform_setup():
     setup(
         name='cutlass_library',
-        version='4.2.0',
+        version='4.2.1',
         description='CUTLASS library generation scripts',
         packages=['cutlass_library']
     )

python/setup_pycute.py

@@ -36,7 +36,7 @@ from setuptools import setup
 def perform_setup():
     setup(
         name='pycute',
-        version='4.2.0',
+        version='4.2.1',
         description='Python implementation of CuTe',
         packages=['pycute'],
     )