__lsx_vmuh_b
LSX intrinsic · group: Integer Computation
Synopsis
__m128i __lsx_vmuh_b (__m128i a, __m128i b)
#include <lsxintrin.h>
Instruction: vmuh.b vr, vr, vr
CPU Flags: LSX
Description
Multiply corresponding signed 8-bit elements in a and b, save the upper half of the double-width product in dst.
Operation
for (int i = 0; i < 16; i++) {
dst.byte[i] = (((s16)(s8)a.byte[i] * (s16)(s8)b.byte[i])) >> 8;
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 4 | 2 |
| 3A6000 | LA664 | 4 | 2 |
| 3C6000 | LA664 | 4 | 2 |
| 2K1000LA | LA264 | 4 | 1 |
| 2K3000 | LA364E | 4 | 1 |