__lsx_vsllwil_h_b
LSX intrinsic · group: Shift
Synopsis
__m128i __lsx_vsllwil_h_b (__m128i a, imm0_7 imm)
#include <lsxintrin.h>
Instruction: vsllwil.h.b vr, vr, imm
CPU Flags: LSX
Description
For each 128-bit lane, sign-extend and shift the 8-bit elements in the lower part of that lane by imm to 16-bit result.
Operation
for (int i = 0; i < 8; i++) {
dst.half[i] = (s16)(s8)a.byte[i] << imm;
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 2 | 1 |
| 3A6000 | LA664 | 2 | 2 |
| 3C6000 | LA664 | 2 | 2 |
| 2K1000LA | LA264 | 2 | 0.5(1/2) |
| 2K3000 | LA364E | 2 | 0.5(1/2) |