__lsx_vmsub_w
LSX intrinsic · group: Integer Computation
Synopsis
__m128i __lsx_vmsub_w (__m128i a, __m128i b, __m128i c)
#include <lsxintrin.h>
Instruction: vmsub.w vr, vr, vr
CPU Flags: LSX
Description
Multiply 32-bit elements in b and c, subtract the low 32 bits of the product from elements in a, save the result in dst.
Operation
for (int i = 0; i < 4; i++) {
dst.word[i] = -b.word[i] * c.word[i] + a.word[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 |
| 2K1000LA | LA264 | 4 | 1 |
| 2K3000 | LA364E | 4 | 1 |