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-patch set 1 is fapi1 Change-Id: I6ecb800b62e93fd0ee6f0f863f5a71e57ed9b1bb Original-Change-Id: I0c382341d415593bffd941372b89e9dfb29eaad4 Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/32788 Tested-by: Jenkins Server <pfd-jenkins+hostboot@us.ibm.com> Reviewed-by: ANDRE A. MARIN <aamarin@us.ibm.com> Reviewed-by: Thi N. Tran <thi@us.ibm.com> Reviewed-by: Brent Wieman <bwieman@us.ibm.com> Reviewed-by: Jennifer A. Stofer <stofer@us.ibm.com> Reviewed-on: http://ralgit01.raleigh.ibm.com/gerrit1/45943 Tested-by: Jenkins OP Build CI <op-jenkins+hostboot@us.ibm.com> Tested-by: FSP CI Jenkins <fsp-CI-jenkins+hostboot@us.ibm.com> Reviewed-by: Christian R. Geddes <crgeddes@us.ibm.com>
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/* IBM_PROLOG_BEGIN_TAG */ | ||
/* This is an automatically generated prolog. */ | ||
/* */ | ||
/* $Source: src/import/generic/memory/lib/utils/bit_count.H $ */ | ||
/* */ | ||
/* OpenPOWER HostBoot Project */ | ||
/* */ | ||
/* Contributors Listed Below - COPYRIGHT 2015,2017 */ | ||
/* [+] International Business Machines Corp. */ | ||
/* */ | ||
/* */ | ||
/* Licensed under the Apache License, Version 2.0 (the "License"); */ | ||
/* you may not use this file except in compliance with the License. */ | ||
/* You may obtain a copy of the License at */ | ||
/* */ | ||
/* http://www.apache.org/licenses/LICENSE-2.0 */ | ||
/* */ | ||
/* Unless required by applicable law or agreed to in writing, software */ | ||
/* distributed under the License is distributed on an "AS IS" BASIS, */ | ||
/* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or */ | ||
/* implied. See the License for the specific language governing */ | ||
/* permissions and limitations under the License. */ | ||
/* */ | ||
/* IBM_PROLOG_END_TAG */ | ||
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/// | ||
/// @file bit_count.H | ||
/// @brief count bits | ||
/// | ||
// *HWP HWP Owner: Brian Silver <bsilver@us.ibm.com> | ||
// *HWP HWP Backup: Andre Marin <aamarin@us.ibm.com> | ||
// *HWP Team: Memory | ||
// *HWP Level: 2 | ||
// *HWP Consumed by: HB:FSP | ||
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#ifndef _MSS_BIT_COUNT_H_ | ||
#define _MSS_BIT_COUNT_H_ | ||
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#include <fapi2.H> | ||
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namespace mss | ||
{ | ||
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/// | ||
/// @brief Count the bits in a T which are set (1) | ||
/// @tparam T an integral type. e.g., uint64_t, uint8_t | ||
/// @param[in] i_value the value to check, count | ||
/// @return uint64_t the number of bits set in the input | ||
/// | ||
template< typename T, typename std::enable_if<std::is_integral<T>::value, int>::type = 0> | ||
inline uint64_t bit_count(const T& i_value) | ||
{ | ||
if (i_value == 0) | ||
{ | ||
return 0; | ||
} | ||
else | ||
{ | ||
return bit_count(i_value >> 1) + (i_value & 0x01); | ||
} | ||
} | ||
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/// | ||
/// @brief Return the bit position of the first bit set, from the left | ||
/// @tparam T, an integral type. e.g., uint64_t, uint8_t | ||
/// @param[in] i_value the value to check | ||
/// @return uint64_t the bit position of the first set bit | ||
/// @bote assumes you checked to make sure there were bits set because it will return 0 | ||
/// | ||
template< typename T, typename std::enable_if<std::is_integral<T>::value, int>::type = 0> | ||
inline uint64_t first_bit_set(const T& i_value, const uint64_t i_pos = 0) | ||
{ | ||
if (i_value == 0) | ||
{ | ||
return 0; | ||
} | ||
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if (fapi2::buffer<T>(i_value).template getBit<0>()) | ||
{ | ||
return i_pos; | ||
} | ||
else | ||
{ | ||
return first_bit_set(i_value << 1, i_pos + 1); | ||
} | ||
} | ||
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} | ||
#endif |