_mm_mulhrs_pi16
Microsoft Specific
Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction pmulhrsw. This instruction multiplies two sets of 16-bit integers.
__m64 _mm_mulhrs_pi16(
__m64 a,
__m64 b
);
Parameters
[in] a
A 64-bit parameter that contains four 16-bit signed integers.[in] b
A 64-bit parameter that contains four 16-bit signed integers.
Return value
A 64-bit value that contains four 16-bit signed integers. The result can be expressed by the following equations.
r0 := INT16(((a0 * b0) + 0x4000) >> 15)
r1 := INT16(((a1 * b1) + 0x4000) >> 15)
r2 := INT16(((a2 * b2) + 0x4000) >> 15)
r3 := INT16(((a3 * b3) + 0x4000) >> 15)
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_mulhrs_pi16 |
x86, x64 |
Header file <tmmintrin.h>
Remarks
r0-r3, a0-a3, and b0-b3 are the sequentially ordered 16-bit components of return value r and parameters a and b. r0, a0, and b0 indicates the least significant 16 bits.
Before you use this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <tmmintrin.h>
int main ()
{
__m64 a, b, final;
a.m64_i16[0] = -0x5CEE;
a.m64_i16[1] = 0x0105;
a.m64_i16[2] = 0x3DA9;
a.m64_i16[3] = -0x7FFF;
b.m64_i16[0] = 0x4000;
b.m64_i16[1] = -0x510A;
b.m64_i16[2] = 0x209D;
b.m64_i16[3] = -0x7FFF;
for (int index = 0; index < 4; index++)
{
final.m64_i16[index] = ((a.m64_i16[index] * b.m64_i16[index]) + 0x4000) >> 15;
}
__m64 res = _mm_mulhrs_pi16(a, b);
printf_s("Res0 should be %d: %d\nRes1 should be %d: %d\n",
final.m64_i16[0], res.m64_i16[0],
final.m64_i16[1], res.m64_i16[1]);
printf_s("Res2 should be %d: %d\nRes3 should be %d: %d\n",
final.m64_i16[2], res.m64_i16[2],
final.m64_i16[3], res.m64_i16[3]);
_mm_empty();
return 0;
}
Res0 should be -11895: -11895
Res1 should be -165: -165
Res2 should be 4022: 4022
Res3 should be 32766: 32766