_mm_sign_pi32
Microsoft Specific
Emits the Supplemental Streaming SIMD Extensions 3 (SSSE3) instruction psignd. This instruction negates or clears 32-bit signed integers of a 64-bit parameter.
__m64 _mm_sign_pi32(
__m64 a,
__m64 b
);
Parameters
[in] a
A 64-bit parameter that contains two 32-bit signed integers.[in] b
A 64-bit parameter that contains two 32-bit signed integers.
Return value
The return value can be expressed with the following equations.
r0 := (b0 < 0) ? -a0 : ((b0 == 0) ? 0 : a0)
r1 := (b1 < 0) ? -a1 : ((b1 == 0) ? 0 : a1)
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_sign_pi32 |
x86, x64 |
Header file <tmmintrin.h>
Remarks
r0, a0, and b0 are the low order 32 bits of return value r and parameters a and b. r1, a1, and b1 are the high order 32 bits of return value r and parameters a and b.
Before you use this intrinsic, software must ensure that the underlying processor supports the instruction.
Example
#include <stdio.h>
#include <tmmintrin.h>
int main ()
{
__m64 a, b;
a.m64_i32[0] = 70000;
a.m64_i32[1] = -75000;
b.m64_i32[0] = 0;
b.m64_i32[1] = -1293;
__m64 res = _mm_sign_pi32(a, b);
printf_s(" a\t b\t res\n%7d\t%7d\t%7d\n%7d\t%7d\t%7d\n",
a.m64_i32[0], b.m64_i32[0], res.m64_i32[0],
a.m64_i32[1], b.m64_i32[1], res.m64_i32[1]);
_mm_empty();
return 0;
}
a b res
70000 0 0
-75000 -1293 75000