From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id 23D751BCA3 for ; Thu, 20 Dec 2018 13:10:01 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 20 Dec 2018 04:10:00 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.56,376,1539673200"; d="scan'208";a="285260242" Received: from irvmail001.ir.intel.com ([163.33.26.43]) by orsmga005.jf.intel.com with ESMTP; 20 Dec 2018 04:09:57 -0800 Received: from sivswdev05.ir.intel.com (sivswdev05.ir.intel.com [10.243.17.64]) by irvmail001.ir.intel.com (8.14.3/8.13.6/MailSET/Hub) with ESMTP id wBKC9vif014139; Thu, 20 Dec 2018 12:09:57 GMT Received: from sivswdev05.ir.intel.com (localhost [127.0.0.1]) by sivswdev05.ir.intel.com with ESMTP id wBKC9vO2001206; Thu, 20 Dec 2018 12:09:57 GMT Received: (from aburakov@localhost) by sivswdev05.ir.intel.com with LOCAL id wBKC9uSb001202; Thu, 20 Dec 2018 12:09:57 GMT From: Anatoly Burakov To: dev@dpdk.org Cc: Wenzhuo Lu , Jingjing Wu , Bernard Iremonger , jerin.jacob@caviumnetworks.com, thomas@monjalon.net Date: Thu, 20 Dec 2018 12:09:50 +0000 Message-Id: X-Mailer: git-send-email 1.7.0.7 In-Reply-To: References: In-Reply-To: <1cf22c82b6ca7561966be674afb8a02add0913b9.1544550999.git.anatoly.burakov@intel.com> References: <1cf22c82b6ca7561966be674afb8a02add0913b9.1544550999.git.anatoly.burakov@intel.com> Subject: [dpdk-dev] [PATCH v2 4/4] common: add 64-bit log2 function X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 20 Dec 2018 12:10:02 -0000 Add missing implementation for 64-bit log2 function, and extend the unit test to test this new function. Also, remove duplicate reimplementation of this function from testpmd and memalloc. Signed-off-by: Anatoly Burakov --- app/test-pmd/testpmd.c | 17 +---------------- lib/librte_eal/common/include/rte_common.h | 18 ++++++++++++++++++ lib/librte_eal/linuxapp/eal/eal_memalloc.c | 17 +---------------- test/test/test_common.c | 20 +++++++++++++++++++- 4 files changed, 39 insertions(+), 33 deletions(-) diff --git a/app/test-pmd/testpmd.c b/app/test-pmd/testpmd.c index a10bc40bb..8d584b008 100644 --- a/app/test-pmd/testpmd.c +++ b/app/test-pmd/testpmd.c @@ -649,28 +649,13 @@ calc_mem_size(uint32_t nb_mbufs, uint32_t mbuf_sz, size_t pgsz, size_t *out) return 0; } -static inline uint32_t -bsf64(uint64_t v) -{ - return (uint32_t)__builtin_ctzll(v); -} - -static inline uint32_t -log2_u64(uint64_t v) -{ - if (v == 0) - return 0; - v = rte_align64pow2(v); - return bsf64(v); -} - static int pagesz_flags(uint64_t page_sz) { /* as per mmap() manpage, all page sizes are log2 of page size * shifted by MAP_HUGE_SHIFT */ - int log2 = log2_u64(page_sz); + int log2 = rte_log2_u64(page_sz); return (log2 << HUGE_SHIFT); } diff --git a/lib/librte_eal/common/include/rte_common.h b/lib/librte_eal/common/include/rte_common.h index 7b50b8479..7178ba1e9 100644 --- a/lib/librte_eal/common/include/rte_common.h +++ b/lib/librte_eal/common/include/rte_common.h @@ -565,6 +565,24 @@ rte_fls_u64(uint64_t x) return (x == 0) ? 0 : 64 - __builtin_clzll(x); } +/** + * Return the rounded-up log2 of a 64-bit integer. + * + * @param v + * The input parameter. + * @return + * The rounded-up log2 of the input, or 0 if the input is 0. + */ +static inline uint32_t +rte_log2_u64(uint64_t v) +{ + if (v == 0) + return 0; + v = rte_align64pow2(v); + /* we checked for v being 0 already, so no undefined behavior */ + return rte_bsf64(v); +} + #ifndef offsetof /** Return the offset of a field in a structure. */ #define offsetof(TYPE, MEMBER) __builtin_offsetof (TYPE, MEMBER) diff --git a/lib/librte_eal/linuxapp/eal/eal_memalloc.c b/lib/librte_eal/linuxapp/eal/eal_memalloc.c index 784939566..6e6af5b06 100644 --- a/lib/librte_eal/linuxapp/eal/eal_memalloc.c +++ b/lib/librte_eal/linuxapp/eal/eal_memalloc.c @@ -208,28 +208,13 @@ get_file_size(int fd) return st.st_size; } -static inline uint32_t -bsf64(uint64_t v) -{ - return (uint32_t)__builtin_ctzll(v); -} - -static inline uint32_t -log2_u64(uint64_t v) -{ - if (v == 0) - return 0; - v = rte_align64pow2(v); - return bsf64(v); -} - static int pagesz_flags(uint64_t page_sz) { /* as per mmap() manpage, all page sizes are log2 of page size * shifted by MAP_HUGE_SHIFT */ - int log2 = log2_u64(page_sz); + int log2 = rte_log2_u64(page_sz); return log2 << RTE_MAP_HUGE_SHIFT; } diff --git a/test/test/test_common.c b/test/test/test_common.c index f6dd4c18d..94d367471 100644 --- a/test/test/test_common.c +++ b/test/test/test_common.c @@ -213,13 +213,31 @@ test_log2(void) const uint32_t step = 1; for (i = 0; i < max; i = i + step) { + uint64_t i64; + + /* extend range for 64-bit */ + i64 = (uint64_t)i << 32; + base = (uint32_t)ceilf(log2(i64)); + compare = rte_log2_u64(i64); + if (base != compare) { + printf("Wrong rte_log2_u64(%" PRIx64 ") val %x, expected %x\n", + i64, compare, base); + return TEST_FAILED; + } + base = (uint32_t)ceilf(log2((uint32_t)i)); - compare = rte_log2_u32(i); + compare = rte_log2_u32((uint32_t)i); if (base != compare) { printf("Wrong rte_log2_u32(%x) val %x, expected %x\n", i, compare, base); return TEST_FAILED; } + compare = rte_log2_u64((uint64_t)i); + if (base != compare) { + printf("Wrong rte_log2_u64(%x) val %x, expected %x\n", + i, compare, base); + return TEST_FAILED; + } } return 0; } -- 2.17.1