__lasx_xvmsub_b
LASX intrinsic · group: Integer Computation
Synopsis
__m256i __lasx_xvmsub_b (__m256i a, __m256i b, __m256i c)
#include <lasxintrin.h>
Instruction: xvmsub.b xr, xr, xr
CPU Flags: LASX
Description
Multiply 8-bit elements in b and c, subtract the low 8 bits of the product from elements in a, save the result in dst.
Operation
for (int i = 0; i < 32; i++) {
dst.byte[i] = -b.byte[i] * c.byte[i] + a.byte[i];
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 4 | 2 |
| 3A6000 | LA664 | 4 | 2 |
| 3C6000 | LA664 | 4 | 2 |