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_MulHigh, _MulUnsignedHigh

Visual Studio 2005

This function returns the high-order 32-bit result of multiplying two arguments.


long __cdecl _MulHigh(
  long arg1,
  long arg2
);

unsigned long __cdecl _MulUnsignedHigh(
  unsigned long arg1,
  unsigned long arg2
);

Parameters

arg1: [in] The first argument in the product.

arg2: [in] The second argument in the product.

Return Values

The long integer result of multiplying arg1 and arg2.

Remarks

This function can be useful for detecting overflow. _MulHigh is useful for multiplying integers scaled to represent [-0.5..0.5), and _MulUnsignedHigh is useful for multiplying integers scaled to represent 0..1).

Requirements

Routine	Required header	Architecture
_MulHigh	<cmnintrin.h>	x86, ARM, SH-4, MIPS
_MulUnsignedHigh	<cmnintrin.h>	x86, ARM, SH-4, MIPS

Other Resources

Intrinsic Functions for Device Compilers

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