| 1 | //===-- cpu_model_common.c - Utilities for cpu model detection ----*- C -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements common utilities for runtime cpu model detection. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #ifndef COMPILER_RT_LIB_BUILTINS_CPU_MODEL_COMMON_H |
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| 14 | #define COMPILER_RT_LIB_BUILTINS_CPU_MODEL_COMMON_H |
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| 15 | |
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| 16 | #define bool int |
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| 17 | #define true 1 |
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| 18 | #define false 0 |
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| 19 | |
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| 20 | #ifndef __has_attribute |
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| 21 | #define __has_attribute(attr) 0 |
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| 22 | #endif |
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| 23 | |
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| 24 | #if __has_attribute(constructor) |
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| 25 | #if __GNUC__ >= 9 |
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| 26 | // Ordinarily init priorities below 101 are disallowed as they are reserved for |
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| 27 | // the implementation. However, we are the implementation, so silence the |
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| 28 | // diagnostic, since it doesn't apply to us. |
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| 29 | #pragma GCC diagnostic ignored "-Wprio-ctor-dtor" |
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| 30 | #endif |
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| 31 | // We're choosing init priority 90 to force our constructors to run before any |
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| 32 | // constructors in the end user application (starting at priority 101). This |
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| 33 | // value matches the libgcc choice for the same functions. |
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| 34 | #ifdef _WIN32 |
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| 35 | // Contructor that replaces the ifunc runs currently with prio 10, see |
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| 36 | // the LowerIFuncPass. The resolver of FMV depends on the cpu features so set |
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| 37 | // the priority to 9. |
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| 38 | #define CONSTRUCTOR_PRIORITY 9 |
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| 39 | #else |
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| 40 | #define CONSTRUCTOR_PRIORITY 90 |
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| 41 | #endif |
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| 42 | #define CONSTRUCTOR_ATTRIBUTE __attribute__((constructor(CONSTRUCTOR_PRIORITY))) |
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| 43 | #else |
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| 44 | // FIXME: For MSVC, we should make a function pointer global in .CRT$X?? so that |
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| 45 | // this runs during initialization. |
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| 46 | #define CONSTRUCTOR_ATTRIBUTE |
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| 47 | #endif |
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| 48 | |
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| 49 | #endif |
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| 50 | |
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