| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | // Copyright (c) 2019 Facebook |
| 3 | #define STACK_MAX_LEN 180 |
| 4 | |
| 5 | /* llvm upstream commit at clang18 |
| 6 | * https://github.com/llvm/llvm-project/commit/1a2e77cf9e11dbf56b5720c607313a566eebb16e |
| 7 | * changed inlining behavior and caused compilation failure as some branch |
| 8 | * target distance exceeded 16bit representation which is the maximum for |
| 9 | * cpu v1/v2/v3. Macro __BPF_CPU_VERSION__ is later implemented in clang18 |
| 10 | * to specify which cpu version is used for compilation. So a smaller |
| 11 | * unroll_count can be set if __BPF_CPU_VERSION__ is less than 4, which |
| 12 | * reduced some branch target distances and resolved the compilation failure. |
| 13 | * |
| 14 | * To capture the case where a developer/ci uses clang18 but the corresponding |
| 15 | * repo checkpoint does not have __BPF_CPU_VERSION__, a smaller unroll_count |
| 16 | * will be set as well to prevent potential compilation failures. |
| 17 | */ |
| 18 | #ifdef __BPF_CPU_VERSION__ |
| 19 | #if __BPF_CPU_VERSION__ < 4 |
| 20 | #define UNROLL_COUNT 90 |
| 21 | #endif |
| 22 | #elif __clang_major__ == 18 |
| 23 | #define UNROLL_COUNT 90 |
| 24 | #endif |
| 25 | |
| 26 | #include "pyperf.h" |