Microsoft Specific
Emits the Streaming SIMD Extensions 4 (SSE4) instruction blendps. This instruction blends packed single precision floating point values.
__m128 _mm_blend_ps(
__m128 a,
__m128 b,
const int mask
);
Parameters
[in] a
A 128-bit parameter that contains four 32-bit floating point values to be blended.[in] b
A 128-bit parameter that contains four 32-bit floating point values to be blended.[in] mask
A constant mask that selects components for the blend operation.
Return value
r0 := (mask0 == 0) ? a0 : b0
r1 := (mask1 == 0) ? a1 : b1
r2 := (mask2 == 0) ? a2 : b2
r3 := (mask3 == 0) ? a3 : b3
Requirements
Intrinsic |
Architecture |
|---|---|
_mm_blend_ps |
x86, x64 |
Header file <smmintrin.h>
Remarks
The return value r and parameters a and b each consist of 128 bits. r0-r3, a0-a3, and b0-b3 are the sequentially ordered 32-bit components of these parameters, where r0, a0, and b0 indicate the least significant 32 bits.
mask0-3 are the four least significant bits of parameter mask.
Before using this intrinsic, software must ensure that the processor supports the instruction.
Example
#include <stdio.h>
#include <smmintrin.h>
int main () {
__m128 a, b;
const int mask = 12;
a.m128_u32[3] = 0xFFEEDDCC;
a.m128_u32[2] = 0xBBAA9988;
a.m128_u32[1] = 0x77665544;
a.m128_u32[0] = 0x33221100;
b.m128_u32[3] = 0x11112222;
b.m128_u32[2] = 0x33334444;
b.m128_u32[1] = 0x55556666;
b.m128_u32[0] = 0x77778888;
__m128 res = _mm_blend_ps( a, b, mask );
printf_s("Original a: 0x%08x, 0x%08x, 0x%08x, 0x%08x\n",
a.m128_u32[3], a.m128_u32[2], a.m128_u32[1], a.m128_u32[0]);
printf_s("Original b: 0x%08x, 0x%08x, 0x%08x, 0x%08x\n",
b.m128_u32[3], b.m128_u32[2], b.m128_u32[1], b.m128_u32[0]);
printf_s("Result res: 0x%08x, 0x%08x, 0x%08x, 0x%08x\n",
res.m128_u32[3], res.m128_u32[2],
res.m128_u32[1], res.m128_u32[0]);
return 0;
}
Original a: 0xffeeddcc, 0xbbaa9988, 0x77665544, 0x33221100 Original b: 0x11112222, 0x33334444, 0x55556666, 0x77778888 Result res: 0x11112222, 0x33334444, 0x77665544, 0x33221100