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578e474efb
0044-soname.diff,23-strlcpy_strlcat_warning_removed.diff,
26-set-correct-float-abi.diff,atomic_library_[12].diff,
fix-clang-path-and-build.diff,fix-lldb-server-build,lldb-libname.diff,
lldb-soname.diff,mips-fpxx-enable.diff,removeduplicatedeclaration.diff}:
Refreshed.
* debian/patches/{silent-gold-utils,kfreebsd-support}.diff: Updated.
47 lines
2.0 KiB
Diff
47 lines
2.0 KiB
Diff
---
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clang/lib/Basic/Targets.cpp | 14 ++++++++++++++
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clang/test/CodeGen/linux-arm-atomic.c | 10 ++++++++++
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2 files changed, 24 insertions(+)
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--- a/clang/lib/Basic/Targets.cpp
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+++ b/clang/lib/Basic/Targets.cpp
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@@ -4414,6 +4414,20 @@ protected:
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Builder.defineMacro("__ELF__");
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}
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+ static bool shouldUseInlineAtomic(const llvm::Triple &T) {
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+ // On linux, binaries targeting old cpus call functions in libgcc to
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+ // perform atomic operations. The implementation in libgcc then calls into
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+ // the kernel which on armv6 and newer uses ldrex and strex. The net result
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+ // is that if we assume the kernel is at least as recent as the hardware,
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+ // it is safe to use atomic instructions on armv6 and newer.
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+ if (T.getOS() != llvm::Triple::Linux)
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+ return false;
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+ StringRef ArchName = T.getArchName();
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+ if (ArchName.startswith("armv6") || ArchName.startswith("armv7"))
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+ return true;
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+ return false;
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+ }
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+
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public:
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RTEMSTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts)
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: OSTargetInfo<Target>(Triple, Opts) {
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--- a/clang/test/CodeGen/linux-arm-atomic.c
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+++ b/clang/test/CodeGen/linux-arm-atomic.c
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@@ -1,5 +1,15 @@
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// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv7-unknown-linux | FileCheck %s
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// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-linux | FileCheck %s
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+
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+typedef int _Atomic_word;
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+_Atomic_word exchange_and_add(volatile _Atomic_word *__mem, int __val) {
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+ return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL);
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+}
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+
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+// CHECK: define {{.*}} @exchange_and_add
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+// CHECK: atomicrmw {{.*}} add
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+// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv7-unknown-linux | FileCheck %s
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+// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-linux | FileCheck %s
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// RUN: %clang_cc1 %s -emit-llvm -o - -triple=thumbv7-unknown-linux | FileCheck %s
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// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-freebsd | FileCheck %s
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// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-bitrig | FileCheck %s
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