__lsx_vbsll_v
LSX intrinsic · group: Shift
Synopsis
__m128i __lsx_vbsll_v (__m128i a, imm0_31 imm)
#include <lsxintrin.h>
Instruction: vbsll.v vr, vr, imm
CPU Flags: LSX
Description
Shift each 128-bit lane of a left by (imm % 16) * 8 bits, filling the vacated bits with zeros.
Operation
int shift = (imm * 8) % 128;
dst.qword[0] = (u128)a.qword[0] << shift;
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 1 | 2 |
| 3A6000 | LA664 | 1 | 4 |
| 3C6000 | LA664 | 1 | 4 |
| 2K1000LA | LA264 | 1 | 1 |
| 2K3000 | LA364E | 1 | 1 |