Microsoft Specific
Emits the Streaming SIMD Extensions 4 (SSE4) instruction pmuldq. This instruction multiplies two sets of 32-bit signed integers.
__m128i _mm_mul_epi32(
__m128i a,
__m128i b
);
Parameters
[in] a
A 128-bit parameter that contains two 32-bit signed integers in the low half of each quadword.[in] b
A 128-bit parameter that contains two 32-bit signed integers in the low half of each quadword.
Return value
A 128-bit value that contains two 64-bit signed integers. The result can be expressed by the following equations.
r0 := low_half(a0 * b0)
r1 := high_half(a0 * b0)
r2 := low_half(a2 * b2)
r3 := high_half(a2 * b2)
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_mul_epi32 |
x86, x64 |
Header file <smmintrin.h>
Remarks
The upper 32-bits of each quadword of the input parameters are not used.
r0-r3, a0-a3, and b0-b3 are the sequentially ordered 32-bit components of return value r and parameters a and b. r0, a0, and b0 indicates the least significant 32 bits.
Before you use this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <smmintrin.h>
int main ()
{
__m128i a, b;
a.m128i_i32[0] = 65000;
a.m128i_i32[1] = 0;
a.m128i_i32[2] = 24000000;
a.m128i_i32[3] = 0;
b.m128i_i32[0] = -320000;
b.m128i_i32[1] = 0;
b.m128i_i32[2] = 56400000;
b.m128i_i32[3] = 0;
__m128i res = _mm_mul_epi32(a, b);
printf_s("Result res: \t%I64d\n\t\t%I64d\n",
res.m128i_i64[0], res.m128i_i64[1]);
return 0;
}
Result res: -20800000000
1353600000000000