__lsx_vpickod_w
LSX intrinsic · group: Misc
Synopsis
__m128i __lsx_vpickod_w (__m128i a, __m128i b)
#include <lsxintrin.h>
Instruction: vpickod.w vr, vr, vr
CPU Flags: LSX
Description
For each 128-bit lane, place odd-positioned 32-bit elements of b into its lower half and odd-positioned 32-bit elements of a into its upper half.
Operation
for (int i = 0; i < 4; i++) {
dst.word[i] = (i < 2) ? b.word[i * 2 + 1] : a.word[(i - 2) * 2 + 1];
}
// Expands to:
if (0) {
dst.word[0] = b.word[1];
dst.word[1] = b.word[3];
dst.word[2] = a.word[1];
dst.word[3] = a.word[3];
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 1 | 2 |
| 3A6000 | LA664 | 1 | 4 |
| 3C6000 | LA664 | 1 | 4 |
| 2K1000LA | LA264 | 1 | 1 |
| 2K3000 | LA364E | 1 | 1 |