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| |
| /* |
| // Purpose: |
| // Intel(R) Integrated Performance Primitives. Cryptography Primitives. |
| // Internal Unsigned BNU misc functionality |
| // |
| // Contents: |
| // cpNLZ_BNU() |
| // |
| */ |
| |
| #include "owncp.h" |
| #include "pcpbnumisc.h" |
| |
| |
| /*F* |
| // Name: cpNLZ_BNU |
| // |
| // Purpose: Returns number of leading zeros of the BNU. |
| // |
| // Returns: |
| // number of leading zeros of the BNU |
| // |
| // Parameters: |
| // x BigNum x |
| // |
| *F*/ |
| |
| cpSize cpNLZ_BNU(BNU_CHUNK_T x) |
| { |
| cpSize nlz = BNU_CHUNK_BITS; |
| if(x) { |
| nlz = 0; |
| #if (BNU_CHUNK_BITS == BNU_CHUNK_64BIT) |
| if( 0==(x & 0xFFFFFFFF00000000) ) { nlz +=32; x<<=32; } |
| if( 0==(x & 0xFFFF000000000000) ) { nlz +=16; x<<=16; } |
| if( 0==(x & 0xFF00000000000000) ) { nlz += 8; x<<= 8; } |
| if( 0==(x & 0xF000000000000000) ) { nlz += 4; x<<= 4; } |
| if( 0==(x & 0xC000000000000000) ) { nlz += 2; x<<= 2; } |
| if( 0==(x & 0x8000000000000000) ) { nlz++; } |
| #else |
| 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++; } |
| #endif |
| } |
| return nlz; |
| } |
