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"