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" 27
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