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Tue, 24 Feb 2026 13:26:25 +0000 From: Chris Burr To: libabigail@sourceware.org Cc: Chris Burr Subject: [PATCH 0/3] Speedup abidiff for large symbol diffs Date: Tue, 24 Feb 2026 14:26:21 +0100 Message-ID: <20260224132624.3469488-1-christopher.burr@cern.ch> X-Mailer: git-send-email 2.47.1 X-ClientProxiedBy: FR3P281CA0175.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:a0::12) To GVAP278MB0151.CHEP278.PROD.OUTLOOK.COM (2603:10a6:710:3f::8) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: GVAP278MB0151:EE_|GVAP278MB0972:EE_|AMS0EPF000001AB:EE_|ZR2P278MB1099:EE_ X-MS-Office365-Filtering-Correlation-Id: 4bebc0af-890a-42c4-93c3-08de73a850db X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; ARA:13230040|10070799003|366016|19092799006|786006|1800799024|376014|7142099003; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:255.255.255.255; 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Ip=[20.208.138.155]; Helo=[mx3.crn.activeguard.cloud] X-MS-Exchange-CrossTenant-AuthSource: AMS0EPF000001AB.eurprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: ZR2P278MB1099 X-Spam-Status: No, score=-2.8 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, JMQ_SPF_NEUTRAL, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on sourceware.org X-BeenThere: libabigail@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Mailing list of the Libabigail project List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libabigail-bounces~patchwork=sourceware.org@sourceware.org When comparing corpora with large numbers of differing symbols (in my case a library which was linking to LLVM and accidentally exposing all LLVM symbols), abidiff was taking ~9 minutes. Two algorithmic bottlenecks were responsible: 1. compute_aliases_for_elf_symbol performed a full O(N) symbol table scan per call, yielding O(N^2) behavior. Fixed by using the existing hash table for O(1) lookup. 2. The corpus diff computation used Myers diff O(N*D) to compare symbol lists, but the downstream consumer only builds unordered maps. Replaced with direct hash-based set difference in O(N+M). Together, these reduce abidiff runtime on corpora with ~57K symbol changes from ~9 minutes to ~1 second. A regression test with 20K synthetic symbols is included. Chris Burr (3): ir: Speedup compute_aliases_for_elf_symbol comparison: Speedup corpus diff computation tests: Add perf regression test for symbol diff include/abg-comparison.h | 6 - src/abg-comparison-priv.h | 4 - src/abg-comparison.cc | 430 +- src/abg-ir.cc | 13 +- tests/data/Makefile.am | 3 + .../test-many-unreferenced-syms-report.txt | 19998 +++++++++++++++ .../test-many-unreferenced-syms-v0.abi | 14 + .../test-many-unreferenced-syms-v1.abi | 20004 ++++++++++++++++ tests/generate-perf-test-data.py | 44 + tests/test-abidiff-exit.cc | 15 + 10 files changed, 40251 insertions(+), 280 deletions(-) create mode 100644 tests/data/test-abidiff-exit/test-many-unreferenced-syms-report.txt create mode 100644 tests/data/test-abidiff-exit/test-many-unreferenced-syms-v0.abi create mode 100644 tests/data/test-abidiff-exit/test-many-unreferenced-syms-v1.abi create mode 100644 tests/generate-perf-test-data.py