__lsx_vffintl_d_w
LSX intrinsic · group: Floating Point Conversion
Synopsis
__m128d __lsx_vffintl_d_w (__m128i a)
#include <lsxintrin.h>
Instruction: vffintl.d.w vr, vr
CPU Flags: LSX
Description
Convert signed 32-bit integer elements in lower part of every 128-bit vector of a to double precision floating point numbers.
Operation
for (int i = 0; i < 2; i++) {
dst.fp64[i] = (f64)(s32)a.word[i]; // rounding mode is not expressed in C
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 5 | 1 |
| 3A6000 | LA664 | 5 | 2 |
| 3C6000 | LA664 | 5 | 2 |
| 2K1000LA | LA264 | 5 | 0.5(1/2) |
| 2K3000 | LA364E | 5 | 0.5(1/2) |