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https://issues.apache.org/jira/browse/HADOOP-19663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18028415#comment-18028415
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ASF GitHub Bot commented on HADOOP-19663:
-----------------------------------------
steveloughran commented on code in PR #7903:
URL: https://github.com/apache/hadoop/pull/7903#discussion_r2414452670
##########
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. */
+}
Review Comment:
nit: add a newline
> Add RISC-V build infrastructure and placeholder implementation for CRC32
> acceleration
> -------------------------------------------------------------------------------------
>
> Key: HADOOP-19663
> URL: https://issues.apache.org/jira/browse/HADOOP-19663
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: common
> Affects Versions: 3.5.0
> Reporter: Ptroc
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.5.0
>
>
> Establish the foundational build infrastructure for RISC-V CRC32 hardware
> acceleration support while maintaining full backward compatibility with
> existing software implementations.
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