_umul128
The latest version of this topic can be found at _umul128.
Microsoft Specific**
Multiplies two 64-bit unsigned integers passed in as the first two arguments and puts the high 64 bits of the product in the 64-bit unsigned integer pointed to by HighProduct and returns the low 64 bits of the product.
Syntax
unsigned __int64 _umul128(
unsigned __int64 Multiplier,
unsigned __int64 Multiplicand,
unsigned __int64 *HighProduct
);
Parameters
[in] Multiplier
The first 64-bit integer to multiply.
[in] Multiplicand
The second 64-bit integer to multiply.
[out] HighProduct
The high 64 bits of the product.
Return Value
The low 64 bits of the product.
Requirements
| Intrinsic | Architecture | Header |
|---|---|---|
_umul128 |
ARM, x64 | <intrin.h> |
Example
// umul128.c
// processor: IPF, x64
#include <stdio.h>
#include <intrin.h>
#pragma intrinsic(_umul128)
int main()
{
unsigned __int64 a = 0x0fffffffffffffffI64;
unsigned __int64 b = 0xf0000000I64;
unsigned __int64 c, d;
d = _umul128(a, b, &c);
printf_s("%#I64x * %#I64x = %#I64x%I64x\n", a, b, c, d);
}
0xfffffffffffffff * 0xf0000000 = 0xeffffffffffffff10000000