__lasx_xvsrlri_b
LASX intrinsic · group: Shift
Synopsis
__m256i __lasx_xvsrlri_b (__m256i a, imm0_7 imm)
#include <lasxintrin.h>
Instruction: xvsrlri.b xr, xr, imm
CPU Flags: LASX
Description
Logical right shift (with rounding) the unsigned 8-bit elements in a by imm, store the result to dst.
Operation
for (int i = 0; i < 32; i++) {
if (imm == 0) {
dst.byte[i] = a.byte[i];
} else {
dst.byte[i] = (a.byte[i] >> imm) + ((a.byte[i] >> (imm - 1)) & 0x1);
}
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 3 | 2 |
| 3A6000 | LA664 | 3 | 2 |
| 3C6000 | LA664 | 3 | 2 |