__lsx_vfrsqrt_d
LSX intrinsic · group: Floating Point Computation
Synopsis
__m128d __lsx_vfrsqrt_d (__m128d a)
#include <lsxintrin.h>
Instruction: vfrsqrt.d vr, vr
CPU Flags: LSX
Description
Compute reciprocal of square root of double precision floating point elements in a.
Operation
for (int i = 0; i < 2; i++) {
dst.fp64[i] = 1.0 / sqrt(a.fp64[i]);
}
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 15 | 0.04(1/27.5) |
| 3A6000 | LA664 | 15 | 0.04(1/26.5) |
| 3C6000 | LA664 | 15 | 0.04(1/26) |
| 2K1000LA | LA264 | 16 | 0(1/55) |
| 2K3000 | LA364E | 16 | 0(1/55) |