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Diffstat (limited to 'ext/ipp/sources/ippcp/pcpbnu32_nlz.c')
-rw-r--r-- | ext/ipp/sources/ippcp/pcpbnu32_nlz.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/ext/ipp/sources/ippcp/pcpbnu32_nlz.c b/ext/ipp/sources/ippcp/pcpbnu32_nlz.c new file mode 100644 index 0000000..85eafe6 --- /dev/null +++ b/ext/ipp/sources/ippcp/pcpbnu32_nlz.c @@ -0,0 +1,81 @@ +/******************************************************************************* +* Copyright 2002-2018 Intel Corporation +* All Rights Reserved. +* +* If this software was obtained under the Intel Simplified Software License, +* the following terms apply: +* +* The source code, information and material ("Material") contained herein is +* owned by Intel Corporation or its suppliers or licensors, and title to such +* Material remains with Intel Corporation or its suppliers or licensors. The +* Material contains proprietary information of Intel or its suppliers and +* licensors. The Material is protected by worldwide copyright laws and treaty +* provisions. No part of the Material may be used, copied, reproduced, +* modified, published, uploaded, posted, transmitted, distributed or disclosed +* in any way without Intel's prior express written permission. No license under +* any patent, copyright or other intellectual property rights in the Material +* is granted to or conferred upon you, either expressly, by implication, +* inducement, estoppel or otherwise. Any license under such intellectual +* property rights must be express and approved by Intel in writing. +* +* Unless otherwise agreed by Intel in writing, you may not remove or alter this +* notice or any other notice embedded in Materials by Intel or Intel's +* suppliers or licensors in any way. +* +* +* If this software was obtained under the Apache License, Version 2.0 (the +* "License"), the following terms apply: +* +* 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. +*******************************************************************************/ + +/* +// Purpose: +// Intel(R) Integrated Performance Primitives. Cryptography Primitives. +// Unsigned internal BNU32 misc functionality +// +// Contents: +// cpNLZ_BNU32() +// +*/ + +#include "owncp.h" +#include "pcpbnuimpl.h" +#include "pcpbnumisc.h" +#include "pcpbnu32misc.h" + +/*F* +// Name: cpNLZ_BNU32 +// +// Purpose: Returns number of leading zeros of the 32-bit BN chunk. +// +// Returns: +// number of leading zeros of the 32-bit BN chunk +// +// Parameters: +// x BigNum x +// +*F*/ + +cpSize cpNLZ_BNU32(Ipp32u x) +{ + cpSize nlz = BITSIZE(Ipp32u); + if(x) { + nlz = 0; + if( 0==(x & 0xFFFF0000) ) { nlz +=16; x<<=16; } + if( 0==(x & 0xFF000000) ) { nlz += 8; x<<= 8; } + if( 0==(x & 0xF0000000) ) { nlz += 4; x<<= 4; } + if( 0==(x & 0xC0000000) ) { nlz += 2; x<<= 2; } + if( 0==(x & 0x80000000) ) { nlz++; } + } + return nlz; +} |