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Annotation of ntddk/src/video/displays/s3/equad.cxx, revision 1.1.1.1

1.1       root        1: /******************************Module*Header*******************************\
                      2: * Module Name: equad.cxx                                                   *
                      3: *                                                                          *
                      4: * Created: 26-Apr-1991 13:01:08                                            *
                      5: * Author: Kirk Olynyk [kirko]                                              *
                      6: *                                                                          *
                      7: * Copyright (c) 1991 Microsoft Corporation                                 *
                      8: *                                                                          *
                      9: \**************************************************************************/
                     10: 
                     11: #include "stddef.h"
                     12: #include "windows.h"
                     13: #include "debug.h"
                     14: #include "equad.hxx"
                     15: 
                     16: /******************************Member*Function*****************************\
                     17: * VOID EUQUAD::vMulInit(ULONG ul1,ULONG ul2)
                     18: *
                     19: * History:
                     20: *  Mon 21-Oct-1991 11:37:26 by Kirk Olynyk [kirko]
                     21: * Wrote it.
                     22: \**************************************************************************/
                     23: 
                     24: VOID EUQUAD::vMulInit(ULONG ul1,ULONG ul2)
                     25: {
                     26: 
                     27: // Use the Rtl signed multiply routine for the lowest 31-bits of each
                     28: // argument
                     29: 
                     30:     *(LARGE_INTEGER*) this =
                     31:             RtlEnlargedIntegerMultiply(
                     32:                 (LONG) ul1 & ~0x80000000,
                     33:                 (LONG) ul2 & ~0x80000000
                     34:                 );
                     35: 
                     36:     EUQUAD euqT;
                     37:     euqT.LowPart = 0;
                     38:     euqT.HighPart = 0;
                     39: 
                     40:     euqT.LowPart += (ul1 & 0x80000000) ? ul2: 0;
                     41:     euqT.LowPart += (ul2 & 0x80000000) ? ul1: 0;
                     42:     euqT.LowPart += (ul1 & ul2 & 0x80000000) ? 0x80000000 : 0;
                     43: 
                     44:     if (!euqT.bZero())
                     45:     {
                     46:         euqT <<= 31;
                     47:         *this += *(EUQUAD*) &euqT;
                     48:     }
                     49: }
                     50: 
                     51: 

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