74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
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//==========================================================================;
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//
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// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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// KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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// PURPOSE.
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//
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// Copyright (c) 1992-2000 Microsoft Corporation. All Rights Reserved.
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//
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//--------------------------------------------------------------------------;
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//
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// muldiv32.h
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//
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// Description:
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// math routine for 32 bit signed and unsiged numbers.
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//
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// MulDiv(a,b,c) = (a * b) / c (round down, signed)
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//
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//==========================================================================;
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#ifndef _INC_MULDIV32
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#define _INC_MULDIV32
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#ifndef INLINE
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#define INLINE __inline
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#endif
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//----------------------------------------------------------------------;
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//
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// Win 32
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//
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//----------------------------------------------------------------------;
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#ifdef _X86_
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//
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// Use 32-bit x86 assembly.
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//
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#pragma warning(disable:4035 4704)
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INLINE LONG MulDiv(LONG a,LONG b,LONG c)
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{
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_asm mov eax,dword ptr a // mov eax, a
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_asm mov ebx,dword ptr b // mov ebx, b
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_asm mov ecx,dword ptr c // mov ecx, c
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_asm imul ebx // imul ebx
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_asm idiv ecx // idiv ecx
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_asm shld edx, eax, 16 // shld edx, eax, 16
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} // MulDiv()
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#pragma warning(default:4035 4704)
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#else
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//
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// Use C9 __int64 support for Daytona RISC platforms.
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//
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INLINE LONG MulDiv( LONG a, LONG b, LONG c )
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{
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return (LONG)( Int32x32To64(a,b) / c );
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}
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#endif
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#endif // _INC_MULDIV32
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