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new c83481e2dc2 HADOOP-19663. [RISC-V] Add RISC-V CRC32 build scaffolding
and placeholder (#7903)
c83481e2dc2 is described below
commit c83481e2dc2682cf5e4633648ca94246f69e1857
Author: Peter Pan <[email protected]>
AuthorDate: Thu Oct 9 21:17:10 2025 +0800
HADOOP-19663. [RISC-V] Add RISC-V CRC32 build scaffolding and placeholder
(#7903)
Contributed by Peter Proc
---
.../hadoop-common/src/CMakeLists.txt | 2 ++
.../src/org/apache/hadoop/util/bulk_crc32_riscv.c | 39 ++++++++++++++++++++++
2 files changed, 41 insertions(+)
diff --git a/hadoop-common-project/hadoop-common/src/CMakeLists.txt
b/hadoop-common-project/hadoop-common/src/CMakeLists.txt
index d2ef03645a4..8bf94acaad0 100644
--- a/hadoop-common-project/hadoop-common/src/CMakeLists.txt
+++ b/hadoop-common-project/hadoop-common/src/CMakeLists.txt
@@ -157,6 +157,8 @@ if(CMAKE_SYSTEM_PROCESSOR MATCHES "^i.86$" OR
CMAKE_SYSTEM_PROCESSOR STREQUAL "x
set(BULK_CRC_ARCH_SOURCE_FIlE "${SRC}/util/bulk_crc32_x86.c")
elseif(CMAKE_SYSTEM_PROCESSOR STREQUAL "aarch64")
set(BULK_CRC_ARCH_SOURCE_FIlE "${SRC}/util/bulk_crc32_aarch64.c")
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^riscv64" OR CMAKE_SYSTEM_PROCESSOR
MATCHES "^riscv32")
+ set(BULK_CRC_ARCH_SOURCE_FIlE "${SRC}/util/bulk_crc32_riscv.c")
else()
message("No HW CRC acceleration for ${CMAKE_SYSTEM_PROCESSOR}, falling back
to SW")
endif()
diff --git
a/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/bulk_crc32_riscv.c
b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/bulk_crc32_riscv.c
new file mode 100644
index 00000000000..5955e4b7f96
--- /dev/null
+++
b/hadoop-common-project/hadoop-common/src/main/native/src/org/apache/hadoop/util/bulk_crc32_riscv.c
@@ -0,0 +1,39 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * RISC-V CRC32 hardware acceleration (placeholder)
+ *
+ * Phase 1: provide a RISC-V-specific compilation unit that currently makes
+ * no runtime changes and falls back to the generic software path in
+ * bulk_crc32.c. Future work will add Zbc-based acceleration and runtime
+ * dispatch.
+ */
+
+#include <assert.h>
+#include <stddef.h> // for size_t
+
+#include "bulk_crc32.h"
+#include "gcc_optimizations.h"
+
+/* Constructor hook reserved for future HW capability detection and
+ * function-pointer dispatch. Intentionally a no-op for the initial phase. */
+void __attribute__((constructor)) init_riscv_crc_support(void)
+{
+ /* No-op: keep using the default software implementations. */
+}
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