blob: 42c4a8b62e3602d7a4ce7e2b529484a317ae2246 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
|
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#define STACK_MAX_LEN 180
/* llvm upstream commit at clang18
* https://github.com/llvm/llvm-project/commit/1a2e77cf9e11dbf56b5720c607313a566eebb16e
* changed inlining behavior and caused compilation failure as some branch
* target distance exceeded 16bit representation which is the maximum for
* cpu v1/v2/v3. Macro __BPF_CPU_VERSION__ is later implemented in clang18
* to specify which cpu version is used for compilation. So a smaller
* unroll_count can be set if __BPF_CPU_VERSION__ is less than 4, which
* reduced some branch target distances and resolved the compilation failure.
*
* To capture the case where a developer/ci uses clang18 but the corresponding
* repo checkpoint does not have __BPF_CPU_VERSION__, a smaller unroll_count
* will be set as well to prevent potential compilation failures.
*/
#ifdef __BPF_CPU_VERSION__
#if __BPF_CPU_VERSION__ < 4
#define UNROLL_COUNT 90
#endif
#elif __clang_major__ == 18
#define UNROLL_COUNT 90
#endif
#include "pyperf.h"
|
