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GET /api/patches/2223149/?format=api
{ "id": 2223149, "url": "http://patchwork.ozlabs.org/api/patches/2223149/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/DM4PR11MB82266EB089C712C94377C906EF252@DM4PR11MB8226.namprd11.prod.outlook.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/projects/17/?format=api", "name": "GNU Compiler Collection", "link_name": "gcc", "list_id": "gcc-patches.gcc.gnu.org", "list_email": "gcc-patches@gcc.gnu.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<DM4PR11MB82266EB089C712C94377C906EF252@DM4PR11MB8226.namprd11.prod.outlook.com>", "list_archive_url": null, "date": "2026-04-14T15:04:40", "name": "libstdc++: Fix philox_engine counter increment carry", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "012f07431322b95911a8ddaac02a16b980cabd44", "submitter": { "id": 93146, "url": "http://patchwork.ozlabs.org/api/people/93146/?format=api", "name": "Tyuleneva, Elena", "email": "elena.tyuleneva@intel.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/DM4PR11MB82266EB089C712C94377C906EF252@DM4PR11MB8226.namprd11.prod.outlook.com/mbox/", "series": [ { "id": 499859, "url": "http://patchwork.ozlabs.org/api/series/499859/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=499859", "date": "2026-04-14T15:04:40", "name": "libstdc++: Fix philox_engine counter increment carry", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499859/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223149/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223149/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "gcc-patches@gcc.gnu.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=ROsp2H3+;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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a=\"76170912\"", "E=Sophos;i=\"6.23,179,1770624000\"; d=\"scan'208,217\";a=\"76170912\"", "E=Sophos;i=\"6.23,179,1770624000\";\n d=\"scan'208,217\";a=\"229090667\"" ], "X-ExtLoop1": "1", "From": "\"Tyuleneva, Elena\" <elena.tyuleneva@intel.com>", "To": "\"gcc-patches@gcc.gnu.org\" <gcc-patches@gcc.gnu.org>", "CC": "\"Arutyunyan, Ruslan\" <ruslan.arutyunyan@intel.com>, \"jwakely@redhat.com\"\n <jwakely@redhat.com>, \"Dyakov, Pavel\" <pavel.dyakov@intel.com>", "Subject": "[PATCH] libstdc++: Fix philox_engine counter increment carry", "Thread-Topic": "[PATCH] libstdc++: Fix philox_engine counter increment carry", "Thread-Index": "AdzMBRGnroNiwS6GSyyE+JMkbLHwFg==", "Date": "Tue, 14 Apr 2026 15:04:40 +0000", "Message-ID": "\n <DM4PR11MB82266EB089C712C94377C906EF252@DM4PR11MB8226.namprd11.prod.outlook.com>", "Accept-Language": "en-US", "Content-Language": "en-US", "X-MS-Has-Attach": "", "X-MS-TNEF-Correlator": "", "authentication-results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=intel.com header.i=@intel.com header.a=rsa-sha256\n header.s=Intel header.b=ROsp2H3+;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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This causes the counter to cycle prematurely\nand never advance past {0, 0, 1, 2^w - 1}.\n\nFix by changing operations order, which results in forming the full-width value\nfrom _M_x[1]:_M_x[0] and then adding 1 on both the n == 4 and n == 2 paths.\n\nlibstdc++-v3/ChangeLog:\n\n * include/bits/random.tcc (philox_engine::operator()): Fix counter\n increment to propagate carry correctly.\n * testsuite/26_numerics/random/philox_engine/operators/counter_carry.cc:\n New test.\n\nSigned-off-by: ElenaTyuleneva elena.tyuleneva@intel.com<mailto:elena.tyuleneva@intel.com>\n---\nlibstdc++-v3/include/bits/random.tcc | 8 +-\n.../philox_engine/operators/counter_carry.cc | 83 +++++++++++++++++++\n2 files changed, 87 insertions(+), 4 deletions(-)\ncreate mode 100644 libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/counter_carry.cc\n\n--\n2.40.1\n\nThe changes were tested on x86_64-pc-linux-gnu.\n\nBest regards,\nElena\nIntel Deutschland GmbH\nRegistered Address: Dornacher Strasse 1, 85622 Feldkirchen, Germany\nTel: +49 89 991 430, www.intel.de\nManaging Directors: Harry Demas, Jeffrey Schneiderman, Yin Chong Sorrell\nChairperson of the Supervisory Board: Nicole Lau\nRegistered Seat: Munich\nCommercial Register: Amtsgericht Muenchen HRB 186928", "diff": "diff --git a/libstdc++-v3/include/bits/random.tcc b/libstdc++-v3/include/bits/random.tcc\r\nindex 7a63e868a89..3380b63f355 100644\r\n--- a/libstdc++-v3/include/bits/random.tcc\r\n+++ b/libstdc++-v3/include/bits/random.tcc\r\n@@ -944,8 +944,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\r\n if constexpr (__n == 4)\r\n {\r\n __type __uh\r\n- = (static_cast<__type>(_M_x[1]) << __w)\r\n- | (static_cast<__type>(_M_x[0]) + 1);\r\n+ = ((static_cast<__type>(_M_x[1]) << __w)\r\n+ | static_cast<__type>(_M_x[0])) + 1;\r\n __type __lh\r\n = (static_cast<__type>(_M_x[3]) << __w)\r\n | static_cast<__type>(_M_x[2]);\r\n@@ -964,8 +964,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\r\n else\r\n {\r\n __type __num =\r\n- (static_cast<__type>(_M_x[1]) << __w)\r\n- | (static_cast<__type>(_M_x[0]) + 1);\r\n+ ((static_cast<__type>(_M_x[1]) << __w)\r\n+ | static_cast<__type>(_M_x[0])) + 1;\r\n _M_x[0] = __num & max();\r\n _M_x[1] = (__num >> __w) & max();\r\n }\r\ndiff --git a/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/counter_carry.cc b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/counter_carry.cc\r\nnew file mode 100644\r\nindex 00000000000..b1527f6a67b\r\n--- /dev/null\r\n+++ b/libstdc++-v3/testsuite/26_numerics/random/philox_engine/operators/counter_carry.cc\r\n@@ -0,0 +1,83 @@\r\n+// { dg-do run { target c++26 } }\r\n+\r\n+// N5014 29.5.4.5 Class Template philox_engine\r\n+\r\n+#include <random>\r\n+#include <array>\r\n+\r\n+#include <testsuite_hooks.h>\r\n+\r\n+// Helper: set counter, skip one block (n outputs), then compare\r\n+// the next block against a reference engine at the expected counter.\r\n+template<typename Engine, std::size_t N>\r\n+void\r\n+verify_carry(const std::array<typename Engine::result_type, N>& current_counter,\r\n+ const std::array<typename Engine::result_type, N>& expected_incremented_counter)\r\n+{\r\n+ Engine eng_a;\r\n+ eng_a.set_counter(current_counter);\r\n+ // Skip the block produced from current_counter\r\n+ eng_a.discard(N);\r\n+\r\n+ Engine eng_b;\r\n+ eng_b.set_counter(expected_incremented_counter);\r\n+\r\n+ // Both engines should now produce identical output\r\n+ for (std::size_t i = 0; i < N; ++i)\r\n+ VERIFY( eng_a() == eng_b() );\r\n+}\r\n+\r\n+\r\n+int main()\r\n+{\r\n+ // philox4x32 (n=4, w=32)\r\n+ verify_carry<std::philox4x32, 4>(std::array<std::philox4x32::result_type, 4>{0, 0, 0, 5},\r\n+ std::array<std::philox4x32::result_type, 4>{0, 0, 0, 6});\r\n+ verify_carry<std::philox4x32, 4>(std::array<std::philox4x32::result_type, 4>{0, 0, 0, 0xFFFFFFFF},\r\n+ std::array<std::philox4x32::result_type, 4>{0, 0, 1, 0});\r\n+ verify_carry<std::philox4x32, 4>(std::array<std::philox4x32::result_type, 4>{0, 0, 1, 0xFFFFFFFF},\r\n+ std::array<std::philox4x32::result_type, 4>{0, 0, 2, 0});\r\n+ verify_carry<std::philox4x32, 4>(std::array<std::philox4x32::result_type, 4>{0, 0, 0xFFFFFFFF, 0xFFFFFFFF},\r\n+ std::array<std::philox4x32::result_type, 4>{0, 1, 0, 0});\r\n+ verify_carry<std::philox4x32, 4>(std::array<std::philox4x32::result_type, 4>{0, 1, 0xFFFFFFFF, 0xFFFFFFFF},\r\n+ std::array<std::philox4x32::result_type, 4>{0, 2, 0, 0});\r\n+ verify_carry<std::philox4x32, 4>(std::array<std::philox4x32::result_type, 4>{0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF},\r\n+ std::array<std::philox4x32::result_type, 4>{0, 0, 0, 0});\r\n+\r\n+ // philox4x64 (n=4, w=64)\r\n+ constexpr auto philox4x64_max = std::philox4x64::max();\r\n+ verify_carry<std::philox4x64, 4>(std::array<std::philox4x64::result_type, 4>{0, 0, 0, philox4x64_max},\r\n+ std::array<std::philox4x64::result_type, 4>{0, 0, 1, 0});\r\n+ verify_carry<std::philox4x64, 4>(std::array<std::philox4x64::result_type, 4>{0, 0, 1, philox4x64_max},\r\n+ std::array<std::philox4x64::result_type, 4>{0, 0, 2, 0});\r\n+ verify_carry<std::philox4x64, 4>(std::array<std::philox4x64::result_type, 4>{0, 0, philox4x64_max, philox4x64_max},\r\n+ std::array<std::philox4x64::result_type, 4>{0, 1, 0, 0});\r\n+ verify_carry<std::philox4x64, 4>(std::array<std::philox4x64::result_type, 4>{0, 1, philox4x64_max, philox4x64_max},\r\n+ std::array<std::philox4x64::result_type, 4>{0, 2, 0, 0});\r\n+ verify_carry<std::philox4x64, 4>(std::array<std::philox4x64::result_type, 4>{philox4x64_max, philox4x64_max, philox4x64_max, philox4x64_max},\r\n+ std::array<std::philox4x64::result_type, 4>{0, 0, 0, 0});\r\n+\r\n+ // philox2x32 (n=2, w=32)\r\n+ using philox2x32 = std::philox_engine<std::uint_fast32_t,\r\n+ 32, 2, 10, 0xCD9E8D57, 0x9E3779B9>;\r\n+ verify_carry<philox2x32, 2>(std::array<philox2x32::result_type, 2>{0, 5},\r\n+ std::array<philox2x32::result_type, 2>{0, 6});\r\n+ verify_carry<philox2x32, 2>(std::array<philox2x32::result_type, 2>{0, 0xFFFFFFFF},\r\n+ std::array<philox2x32::result_type, 2>{1, 0});\r\n+ verify_carry<philox2x32, 2>(std::array<philox2x32::result_type, 2>{1, 0xFFFFFFFF},\r\n+ std::array<philox2x32::result_type, 2>{2, 0});\r\n+ verify_carry<philox2x32, 2>(std::array<philox2x32::result_type, 2>{0xFFFFFFFF, 0xFFFFFFFF},\r\n+ std::array<philox2x32::result_type, 2>{0, 0});\r\n+ // philox2x64 (n=2, w=64)\r\n+ using philox2x64 = std::philox_engine<std::uint_fast64_t,\r\n+ 64, 2, 10, 0xCD9E8D57, 0x9E3779B9>;\r\n+ constexpr auto philox2x64_max = philox2x64::max();\r\n+ verify_carry<philox2x64, 2>(std::array<philox2x64::result_type, 2>{0, 5},\r\n+ std::array<philox2x64::result_type, 2>{0, 6});\r\n+ verify_carry<philox2x64, 2>(std::array<philox2x64::result_type, 2>{0, philox2x64_max},\r\n+ std::array<philox2x64::result_type, 2>{1, 0});\r\n+ verify_carry<philox2x64, 2>(std::array<philox2x64::result_type, 2>{1, philox2x64_max},\r\n+ std::array<philox2x64::result_type, 2>{2, 0});\r\n+ verify_carry<philox2x64, 2>(std::array<philox2x64::result_type, 2>{philox2x64_max, philox2x64_max},\r\n+ std::array<philox2x64::result_type, 2>{0, 0});\r\n+}\r\n", "prefixes": [] }