__lsx_vsigncov_d
LSX intrinsic · group: Misc
Synopsis
__m128i __lsx_vsigncov_d (__m128i a, __m128i b)
#include <lsxintrin.h>
Instruction: vsigncov.d vr, vr, vr
CPU Flags: LSX
Description
If the 64-bit element in a equals to zero, set the result to zero. If the signed 64-bit element in a is positive, copy element in b to result. Otherwise, copy negated element in b to result. If a and b are the same vectors, it is equivalent to computing absolute value.
Operation
for (int i = 0; i < 2; i++) {
dst.dword[i] =
(a.dword[i] == 0) ? 0 : ((s64)a.dword[i] > 0 ? b.dword[i] : -b.dword[i]);
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 1 | 2 |
| 3A6000 | LA664 | 1 | 2 |
| 3C6000 | LA664 | 1 | 2 |
| 2K1000LA | LA264 | 1 | 1 |
| 2K3000 | LA364E | 1 | 1 |