__lsx_vbitrevi_d
LSX intrinsic · group: Bitwise Operations
Synopsis
__m128i __lsx_vbitrevi_d (__m128i a, imm0_63 imm)
#include <lsxintrin.h>
Instruction: vbitrevi.d vr, vr, imm
CPU Flags: LSX
Description
For each 64-bit element, toggle the bit indexed by imm, save the result in dst.
Examples
__m128i __lsx_vbitrevi_d(__m128i{0x0f0f0f0f0f0f0f0f, 0x99aabbccddeeff00}, 1)
= 0x0f0f0f0f0f0f0f0d 0x99aabbccddeeff02
Operation
for (int i = 0; i < 2; i++) {
dst.dword[i] = a.dword[i] ^ ((u64)1 << imm);
}
Tested on real machine.
Latency and Throughput
| CPU | µarch | Latency | Throughput (IPC) |
|---|---|---|---|
| 3C5000 | LA464 | 2 | 2 |
| 3A6000 | LA664 | 2 | 2 |
| 3C6000 | LA664 | 2 | 2 |
| 2K1000LA | LA264 | 2 | 1 |
| 2K3000 | LA364E | 2 | 1 |