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GET /api/patches/28305/?format=api
{ "id": 28305, "url": "https://patches.dpdk.org/api/patches/28305/?format=api", "web_url": "https://patches.dpdk.org/project/dpdk/patch/1504442189-4384-1-git-send-email-pbhagavatula@caviumnetworks.com/", "project": { "id": 1, "url": "https://patches.dpdk.org/api/projects/1/?format=api", "name": "DPDK", "link_name": "dpdk", "list_id": "dev.dpdk.org", "list_email": "dev@dpdk.org", "web_url": "http://core.dpdk.org", "scm_url": "git://dpdk.org/dpdk", "webscm_url": "http://git.dpdk.org/dpdk", "list_archive_url": "https://inbox.dpdk.org/dev", "list_archive_url_format": "https://inbox.dpdk.org/dev/{}", "commit_url_format": "" }, "msgid": "<1504442189-4384-1-git-send-email-pbhagavatula@caviumnetworks.com>", "list_archive_url": "https://inbox.dpdk.org/dev/1504442189-4384-1-git-send-email-pbhagavatula@caviumnetworks.com", "date": "2017-09-03T12:36:27", "name": "[dpdk-dev,v3,1/3] eal: introduce integer divide through reciprocal", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": true, "hash": "3255648d591332fbaa72f0b5c067a3f806dc327b", "submitter": { "id": 768, "url": "https://patches.dpdk.org/api/people/768/?format=api", "name": "Pavan Nikhilesh", "email": "pbhagavatula@caviumnetworks.com" }, "delegate": null, "mbox": "https://patches.dpdk.org/project/dpdk/patch/1504442189-4384-1-git-send-email-pbhagavatula@caviumnetworks.com/mbox/", "series": [], "comments": "https://patches.dpdk.org/api/patches/28305/comments/", "check": "success", "checks": "https://patches.dpdk.org/api/patches/28305/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<dev-bounces@dpdk.org>", "X-Original-To": "patchwork@dpdk.org", "Delivered-To": "patchwork@dpdk.org", "Received": [ "from [92.243.14.124] (localhost [IPv6:::1])\n\tby dpdk.org (Postfix) with ESMTP id 3A5FF7CAF;\n\tSun, 3 Sep 2017 14:37:08 +0200 (CEST)", "from NAM03-BY2-obe.outbound.protection.outlook.com\n\t(mail-by2nam03on0071.outbound.protection.outlook.com [104.47.42.71])\n\tby dpdk.org (Postfix) with ESMTP id B26217CAB\n\tfor <dev@dpdk.org>; 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PCL:0;\n\tRULEID:(100000700101)(100105000095)(100000701101)(100105300095)(100000702101)(100105100095)(6040450)(601004)(2401047)(8121501046)(5005006)(3002001)(10201501046)(100000703101)(100105400095)(93006095)(6041248)(20161123555025)(20161123560025)(20161123562025)(20161123564025)(20161123558100)(201703131423075)(201702281528075)(201703061421075)(201703061406153)(6072148)(201708071742011)(100000704101)(100105200095)(100000705101)(100105500095);\n\tSRVR:BN6PR07MB3457; BCL:0; PCL:0;\n\tRULEID:(100000800101)(100110000095)(100000801101)(100110300095)(100000802101)(100110100095)(100000803101)(100110400095)(100000804101)(100110200095)(100000805101)(100110500095);\n\tSRVR:BN6PR07MB3457; ", "X-Forefront-PRVS": "041963B986", "X-Forefront-Antispam-Report": "SFV:NSPM;\n\tSFS:(10009020)(6009001)(6069001)(189002)(199003)(107886003)(5003940100001)(6116002)(3846002)(2906002)(189998001)(5660300001)(575784001)(110136004)(48376002)(53936002)(6512007)(97736004)(50466002)(33646002)(66066001)(2351001)(106356001)(2361001)(105586002)(36756003)(6506006)(50986999)(42186005)(47776003)(101416001)(478600001)(6486002)(25786009)(81156014)(50226002)(68736007)(8936002)(305945005)(72206003)(8676002)(81166006)(7736002)(6666003)(42882006)(6916009)(4326008)(42262002);\n\tDIR:OUT; SFP:1101; SCL:1; SRVR:BN6PR07MB3457; H:localhost.localdomain;\n\tFPR:; \n\tSPF:None; PTR:InfoNoRecords; MX:1; A:1; LANG:en; ", "Received-SPF": "None (protection.outlook.com: cavium.com does not designate\n\tpermitted sender hosts)", "SpamDiagnosticOutput": "1:99", "SpamDiagnosticMetadata": "NSPM", "X-OriginatorOrg": "caviumnetworks.com", "X-MS-Exchange-CrossTenant-OriginalArrivalTime": "03 Sep 2017 12:37:02.9579\n\t(UTC)", "X-MS-Exchange-CrossTenant-FromEntityHeader": "Hosted", "X-MS-Exchange-CrossTenant-Id": "711e4ccf-2e9b-4bcf-a551-4094005b6194", "X-MS-Exchange-Transport-CrossTenantHeadersStamped": "BN6PR07MB3457", "Subject": "[dpdk-dev] [PATCH v3 1/3] eal: introduce integer divide through\n\treciprocal", "X-BeenThere": "dev@dpdk.org", "X-Mailman-Version": "2.1.15", "Precedence": "list", "List-Id": "DPDK patches and discussions <dev.dpdk.org>", "List-Unsubscribe": "<http://dpdk.org/ml/options/dev>,\n\t<mailto:dev-request@dpdk.org?subject=unsubscribe>", "List-Archive": "<http://dpdk.org/ml/archives/dev/>", "List-Post": "<mailto:dev@dpdk.org>", "List-Help": "<mailto:dev-request@dpdk.org?subject=help>", "List-Subscribe": "<http://dpdk.org/ml/listinfo/dev>,\n\t<mailto:dev-request@dpdk.org?subject=subscribe>", "Errors-To": "dev-bounces@dpdk.org", "Sender": "\"dev\" <dev-bounces@dpdk.org>" }, "content": "In some use cases of integer division, denominator remains constant and\nnumerator varies. It is possible to optimize division for such specific\nscenarios.\n\nThe librte_sched uses rte_reciprocal to optimize division so, moving it to\neal/common would allow other libraries and applications to use it.\n\nSigned-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>\n---\n\nv3 changes:\n - fix x86_32 compilation issue\n - fix improper licence in test\n\nv2 changes:\n - fix compilation issues with .map files\n - add test cases for correctness and performance\n - remove extra licence inclusion\n - fix coding style issues\n\n lib/librte_eal/bsdapp/eal/Makefile | 1 +\n lib/librte_eal/bsdapp/eal/rte_eal_version.map | 7 +++++++\n lib/librte_eal/common/Makefile | 1 +\n lib/{librte_sched => librte_eal/common/include}/rte_reciprocal.h | 6 ++++--\n lib/{librte_sched => librte_eal/common}/rte_reciprocal.c | 6 ++++--\n lib/librte_eal/linuxapp/eal/Makefile | 1 +\n lib/librte_eal/linuxapp/eal/rte_eal_version.map | 7 +++++++\n lib/librte_sched/Makefile | 2 --\n lib/librte_sched/rte_sched.c | 2 +-\n 9 files changed, 26 insertions(+), 7 deletions(-)\n rename lib/{librte_sched => librte_eal/common/include}/rte_reciprocal.h (87%)\n rename lib/{librte_sched => librte_eal/common}/rte_reciprocal.c (96%)\n\n--\n2.7.4", "diff": "diff --git a/lib/librte_eal/bsdapp/eal/Makefile b/lib/librte_eal/bsdapp/eal/Makefile\nindex 005019e..56f9804 100644\n--- a/lib/librte_eal/bsdapp/eal/Makefile\n+++ b/lib/librte_eal/bsdapp/eal/Makefile\n@@ -88,6 +88,7 @@ SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += malloc_elem.c\n SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += malloc_heap.c\n SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_keepalive.c\n SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_service.c\n+SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_reciprocal.c\n\n # from arch dir\n SRCS-$(CONFIG_RTE_EXEC_ENV_BSDAPP) += rte_cpuflags.c\ndiff --git a/lib/librte_eal/bsdapp/eal/rte_eal_version.map b/lib/librte_eal/bsdapp/eal/rte_eal_version.map\nindex 79e7d31..d0bda66 100644\n--- a/lib/librte_eal/bsdapp/eal/rte_eal_version.map\n+++ b/lib/librte_eal/bsdapp/eal/rte_eal_version.map\n@@ -238,3 +238,10 @@ EXPERIMENTAL {\n \trte_service_unregister;\n\n } DPDK_17.08;\n+\n+DPDK_17.11 {\n+\tglobal:\n+\n+\trte_reciprocal_value;\n+\n+} DPDK_17.08;\ndiff --git a/lib/librte_eal/common/Makefile b/lib/librte_eal/common/Makefile\nindex e8fd67a..a680b2d 100644\n--- a/lib/librte_eal/common/Makefile\n+++ b/lib/librte_eal/common/Makefile\n@@ -42,6 +42,7 @@ INC += rte_hexdump.h rte_devargs.h rte_bus.h rte_dev.h rte_vdev.h\n INC += rte_pci_dev_feature_defs.h rte_pci_dev_features.h\n INC += rte_malloc.h rte_keepalive.h rte_time.h\n INC += rte_service.h rte_service_component.h\n+INC += rte_reciprocal.h\n\n GENERIC_INC := rte_atomic.h rte_byteorder.h rte_cycles.h rte_prefetch.h\n GENERIC_INC += rte_spinlock.h rte_memcpy.h rte_cpuflags.h rte_rwlock.h\ndiff --git a/lib/librte_sched/rte_reciprocal.h b/lib/librte_eal/common/include/rte_reciprocal.h\nsimilarity index 87%\nrename from lib/librte_sched/rte_reciprocal.h\nrename to lib/librte_eal/common/include/rte_reciprocal.h\nindex 5e21f09..b6d752f 100644\n--- a/lib/librte_sched/rte_reciprocal.h\n+++ b/lib/librte_eal/common/include/rte_reciprocal.h\n@@ -29,13 +29,15 @@ struct rte_reciprocal {\n \tuint8_t sh1, sh2;\n };\n\n-static inline uint32_t rte_reciprocal_divide(uint32_t a, struct rte_reciprocal R)\n+static inline uint32_t\n+rte_reciprocal_divide(uint32_t a, struct rte_reciprocal R)\n {\n \tuint32_t t = (uint32_t)(((uint64_t)a * R.m) >> 32);\n\n \treturn (t + ((a - t) >> R.sh1)) >> R.sh2;\n }\n\n-struct rte_reciprocal rte_reciprocal_value(uint32_t d);\n+struct rte_reciprocal\n+rte_reciprocal_value(uint32_t d);\n\n #endif /* _RTE_RECIPROCAL_H_ */\ndiff --git a/lib/librte_sched/rte_reciprocal.c b/lib/librte_eal/common/rte_reciprocal.c\nsimilarity index 96%\nrename from lib/librte_sched/rte_reciprocal.c\nrename to lib/librte_eal/common/rte_reciprocal.c\nindex 652f023..7ab99b4 100644\n--- a/lib/librte_sched/rte_reciprocal.c\n+++ b/lib/librte_eal/common/rte_reciprocal.c\n@@ -41,7 +41,8 @@\n /* find largest set bit.\n * portable and slow but does not matter for this usage.\n */\n-static inline int fls(uint32_t x)\n+static inline int\n+fls(uint32_t x)\n {\n \tint b;\n\n@@ -53,7 +54,8 @@ static inline int fls(uint32_t x)\n \treturn 0;\n }\n\n-struct rte_reciprocal rte_reciprocal_value(uint32_t d)\n+struct rte_reciprocal\n+rte_reciprocal_value(uint32_t d)\n {\n \tstruct rte_reciprocal R;\n \tuint64_t m;\ndiff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile\nindex 90bca4d..98f3b8e 100644\n--- a/lib/librte_eal/linuxapp/eal/Makefile\n+++ b/lib/librte_eal/linuxapp/eal/Makefile\n@@ -100,6 +100,7 @@ SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += malloc_elem.c\n SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += malloc_heap.c\n SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_keepalive.c\n SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_service.c\n+SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_reciprocal.c\n\n # from arch dir\n SRCS-$(CONFIG_RTE_EXEC_ENV_LINUXAPP) += rte_cpuflags.c\ndiff --git a/lib/librte_eal/linuxapp/eal/rte_eal_version.map b/lib/librte_eal/linuxapp/eal/rte_eal_version.map\nindex 468c706..65117cb 100644\n--- a/lib/librte_eal/linuxapp/eal/rte_eal_version.map\n+++ b/lib/librte_eal/linuxapp/eal/rte_eal_version.map\n@@ -243,3 +243,10 @@ EXPERIMENTAL {\n \trte_service_unregister;\n\n } DPDK_17.08;\n+\n+DPDK_17.11 {\n+\tglobal:\n+\n+\trte_reciprocal_value;\n+\n+} DPDK_17.08;\ndiff --git a/lib/librte_sched/Makefile b/lib/librte_sched/Makefile\nindex 18274e7..569656b 100644\n--- a/lib/librte_sched/Makefile\n+++ b/lib/librte_sched/Makefile\n@@ -52,10 +52,8 @@ LIBABIVER := 1\n # all source are stored in SRCS-y\n #\n SRCS-$(CONFIG_RTE_LIBRTE_SCHED) += rte_sched.c rte_red.c rte_approx.c\n-SRCS-$(CONFIG_RTE_LIBRTE_SCHED) += rte_reciprocal.c\n\n # install includes\n SYMLINK-$(CONFIG_RTE_LIBRTE_SCHED)-include := rte_sched.h rte_bitmap.h rte_sched_common.h rte_red.h rte_approx.h\n-SYMLINK-$(CONFIG_RTE_LIBRTE_SCHED)-include += rte_reciprocal.h\n\n include $(RTE_SDK)/mk/rte.lib.mk\ndiff --git a/lib/librte_sched/rte_sched.c b/lib/librte_sched/rte_sched.c\nindex b7cba11..3b8ccaa 100644\n--- a/lib/librte_sched/rte_sched.c\n+++ b/lib/librte_sched/rte_sched.c\n@@ -42,12 +42,12 @@\n #include <rte_prefetch.h>\n #include <rte_branch_prediction.h>\n #include <rte_mbuf.h>\n+#include <rte_reciprocal.h>\n\n #include \"rte_sched.h\"\n #include \"rte_bitmap.h\"\n #include \"rte_sched_common.h\"\n #include \"rte_approx.h\"\n-#include \"rte_reciprocal.h\"\n\n #ifdef __INTEL_COMPILER\n #pragma warning(disable:2259) /* conversion may lose significant bits */\n", "prefixes": [ "dpdk-dev", "v3", "1/3" ] }