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Chandler Carruth
f27a977d86
These only show up post-merge as we're only running ASan there. This disables the recent `[[clang::preserve_none]]` optimization when ASan is enabled as there is an LLVM bug on AArch64 that causes register corruption with that calling convention. This is factored into a common helper library so we can use it in other places as well. Assisted-by: Antigravity with Gemini
26 lines
1.0 KiB
C++
26 lines
1.0 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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#ifndef CARBON_COMMON_PRESERVE_NONE_H_
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#define CARBON_COMMON_PRESERVE_NONE_H_
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#include "llvm/Support/Compiler.h"
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// Applies `[[clang::preserve_none]]` when supported and safe.
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//
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// Disabled when building with AddressSanitizer on AArch64 to work around an
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// LLVM backend bug: when sanitizer stack instrumentation combines dynamic stack
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// allocation with stack realignment, AArch64 reserves `x19` as the stack base
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// pointer (`hasBasePointer`) and fails to save and restore `x19` across calls
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// to `[[clang::preserve_none]]` callees that clobber `x19`.
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#if __has_cpp_attribute(clang::preserve_none) && \
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!((defined(__aarch64__) || defined(_M_ARM64)) && \
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(LLVM_ADDRESS_SANITIZER_BUILD || LLVM_HWADDRESS_SANITIZER_BUILD))
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#define CARBON_PRESERVE_NONE [[clang::preserve_none]]
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#else
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#define CARBON_PRESERVE_NONE
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#endif
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#endif // CARBON_COMMON_PRESERVE_NONE_H_
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