__lasx_xvfscaleb_d
LASX intrinsic · group: Undocumented Intrinsics
Synopsis
__m256d __lasx_xvfscaleb_d (__m256d a, __m256i b)
#include <lasxintrin.h>
Instruction: xvfscaleb.d xr, xr, xr
CPU Flags: LASX
Description
Compute IEEE 754 scaleB (multiply by 2^b) of double precision floating point elements in a using integer exponents in b. Currently undocumented.
Operation
for (int i = 0; i < 4; i++) {
dst.fp64[i] = __builtin_scalbn(a.fp64[i], b.dword[i]);
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C6000 | LA664 | 4 | 2 |