27 lines
1.0 KiB
C
27 lines
1.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#define STACK_MAX_LEN 180
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/* llvm upstream commit at clang18
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* https://github.com/llvm/llvm-project/commit/1a2e77cf9e11dbf56b5720c607313a566eebb16e
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* changed inlining behavior and caused compilation failure as some branch
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* target distance exceeded 16bit representation which is the maximum for
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* cpu v1/v2/v3. Macro __BPF_CPU_VERSION__ is later implemented in clang18
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* to specify which cpu version is used for compilation. So a smaller
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* unroll_count can be set if __BPF_CPU_VERSION__ is less than 4, which
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* reduced some branch target distances and resolved the compilation failure.
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*
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* To capture the case where a developer/ci uses clang18 but the corresponding
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* repo checkpoint does not have __BPF_CPU_VERSION__, a smaller unroll_count
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* will be set as well to prevent potential compilation failures.
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*/
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#ifdef __BPF_CPU_VERSION__
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#if __BPF_CPU_VERSION__ < 4
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#define UNROLL_COUNT 90
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#endif
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#elif __clang_major__ == 18
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#define UNROLL_COUNT 90
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#endif
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#include "pyperf.h"
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