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70 lines
1.5 KiB
70 lines
1.5 KiB
//----------------------------------------------------------------------------
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//
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// cspnutil.h
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//
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// Sundry span utility declarations.
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//
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// Copyright (C) Microsoft Corporation, 1997.
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//
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//----------------------------------------------------------------------------
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#ifndef _SPANUTIL_H_
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#define _SPANUTIL_H_
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#ifdef _X86_
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// warning C4035: 'imul32h' : no return value
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#pragma warning( disable : 4035 )
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#endif
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//-----------------------------------------------------------------------------
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//
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// imul32h
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//
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// Returns the upper 32 bits of a 32 bit by 32 bit signed multiply.
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//
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//-----------------------------------------------------------------------------
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inline INT32 imul32h(INT32 x, INT32 y)
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{
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#ifdef _X86_
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_asm
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{
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mov eax, x
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mov edx, y
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imul edx
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mov eax, edx
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}
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#else
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return (INT32)(((LONGLONG)x * y) >> 32);
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#endif
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}
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//-----------------------------------------------------------------------------
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//
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// imul32h_s20
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//
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// Returns (x*y)>>20
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//
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//-----------------------------------------------------------------------------
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inline INT32 imul32h_s20(INT32 x, INT32 y)
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{
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#ifdef _X86_
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_asm
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{
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mov eax, x
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mov edx, y
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imul edx
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shrd eax, edx, 20
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}
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#else
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return (INT32)(((LONGLONG)x * y) >> 20);
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#endif
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}
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#ifdef _X86_
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// in general, we want to look at these warnings
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#pragma warning( default : 4035 )
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#endif
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#endif // #ifndef _SPANUTIL_H_
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