a6dbe3721e
per Intel policy to include file commit date using git cmd below. The policy does not apply to non-Intel (C) notices. git log --follow -C90% --format=%ad --date default <file> | tail -1 and then pull just the 4 digit year from the result. Intel copyrights were not added to files where Intel either had no contribution ot the contribution lacked substance (ie license header updates, formatting changes, etc). Contribution date used "--follow -C95%" to get the most accurate date. Note that several files in this patch didn't end the license/(c) block with a blank comment line so these were added as the vast majority of files do have this last blank line. Simply there for consistency. Signed-off-by: paul luse <paul.e.luse@intel.com> Change-Id: Id5b7ce4f658fe87132f14139ead58d6e285c04d4 Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/15192 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Reviewed-by: Jim Harris <james.r.harris@intel.com> Reviewed-by: Ben Walker <benjamin.walker@intel.com> Community-CI: Mellanox Build Bot
47 lines
1.4 KiB
C
47 lines
1.4 KiB
C
/* SPDX-License-Identifier: BSD-3-Clause
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* Copyright (C) 2019 Intel Corporation. All rights reserved.
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* All rights reserved.
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*/
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#include "spdk/stdinc.h"
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#include "spdk/util.h"
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#include "spdk/assert.h"
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/* The following will automatically generate several version of
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* this function, targeted at different architectures. This
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* is only supported by GCC 6 or newer. */
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#if defined(__GNUC__) && __GNUC__ >= 6 && !defined(__clang__) \
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&& (defined(__i386__) || defined(__x86_64__)) \
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&& defined(__ELF__)
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__attribute__((target_clones("bmi", "arch=core2", "arch=atom", "default")))
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#endif
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uint32_t
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spdk_u32log2(uint32_t x)
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{
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if (x == 0) {
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/* log(0) is undefined */
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return 0;
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}
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SPDK_STATIC_ASSERT(sizeof(x) == sizeof(unsigned int), "Incorrect size");
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return 31u - __builtin_clz(x);
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}
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/* The following will automatically generate several version of
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* this function, targeted at different architectures. This
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* is only supported by GCC 6 or newer. */
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#if defined(__GNUC__) && __GNUC__ >= 6 && !defined(__clang__) \
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&& (defined(__i386__) || defined(__x86_64__)) \
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&& defined(__ELF__)
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__attribute__((target_clones("bmi", "arch=core2", "arch=atom", "default")))
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#endif
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uint64_t
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spdk_u64log2(uint64_t x)
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{
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if (x == 0) {
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/* log(0) is undefined */
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return 0;
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}
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SPDK_STATIC_ASSERT(sizeof(x) == sizeof(unsigned long long), "Incorrect size");
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return 63u - __builtin_clzll(x);
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}
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