| // Copyright 2021 The Fuchsia Authors | |
| // | |
| // Use of this source code is governed by a MIT-style | |
| // license that can be found in the LICENSE file or at | |
| // https://opensource.org/licenses/MIT | |
| #include <lib/arch/asm.h> | |
| .text | |
| // uint64_t multiply_by_two(uint64_t x). | |
| .function multiply_by_two, global | |
| #if defined(__aarch64__) | |
| lsl x0, x0, #1 | |
| #elif defined(__x86_64__) | |
| lea (%rdi, %rdi), %rax | |
| #else | |
| .error "unknown architecture" | |
| #endif | |
| ret | |
| .end_function |