mirror of
https://git.proxmox.com/git/llvm-toolchain
synced 2025-06-12 15:39:07 +00:00
46 lines
2.3 KiB
Diff
46 lines
2.3 KiB
Diff
Index: llvm-toolchain-snapshot_3.8~svn242701/clang/lib/Basic/Targets.cpp
|
|
===================================================================
|
|
--- llvm-toolchain-snapshot_3.8~svn242701.orig/clang/lib/Basic/Targets.cpp
|
|
+++ llvm-toolchain-snapshot_3.8~svn242701/clang/lib/Basic/Targets.cpp
|
|
@@ -4325,6 +4325,20 @@ class ARMTargetInfo : public TargetInfo
|
|
}
|
|
}
|
|
|
|
+ static bool shouldUseInlineAtomic(const llvm::Triple &T) {
|
|
+ // On linux, binaries targeting old cpus call functions in libgcc to
|
|
+ // perform atomic operations. The implementation in libgcc then calls into
|
|
+ // the kernel which on armv6 and newer uses ldrex and strex. The net result
|
|
+ // is that if we assume the kernel is at least as recent as the hardware,
|
|
+ // it is safe to use atomic instructions on armv6 and newer.
|
|
+ if (T.getOS() != llvm::Triple::Linux)
|
|
+ return false;
|
|
+ StringRef ArchName = T.getArchName();
|
|
+ if (ArchName.startswith("armv6") || ArchName.startswith("armv7"))
|
|
+ return true;
|
|
+ return false;
|
|
+ }
|
|
+
|
|
public:
|
|
ARMTargetInfo(const llvm::Triple &Triple, bool IsBigEndian)
|
|
: TargetInfo(Triple), CPU("arm1136j-s"), FPMath(FP_Default),
|
|
Index: llvm-toolchain-snapshot_3.8~svn242701/clang/test/CodeGen/linux-arm-atomic.c
|
|
===================================================================
|
|
--- llvm-toolchain-snapshot_3.8~svn242701.orig/clang/test/CodeGen/linux-arm-atomic.c
|
|
+++ llvm-toolchain-snapshot_3.8~svn242701/clang/test/CodeGen/linux-arm-atomic.c
|
|
@@ -1,5 +1,15 @@
|
|
// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv7-unknown-linux | FileCheck %s
|
|
// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-linux | FileCheck %s
|
|
+
|
|
+typedef int _Atomic_word;
|
|
+_Atomic_word exchange_and_add(volatile _Atomic_word *__mem, int __val) {
|
|
+ return __atomic_fetch_add(__mem, __val, __ATOMIC_ACQ_REL);
|
|
+}
|
|
+
|
|
+// CHECK: define {{.*}} @exchange_and_add
|
|
+// CHECK: atomicrmw {{.*}} add
|
|
+// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv7-unknown-linux | FileCheck %s
|
|
+// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-linux | FileCheck %s
|
|
// RUN: %clang_cc1 %s -emit-llvm -o - -triple=thumbv7-unknown-linux | FileCheck %s
|
|
// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-freebsd | FileCheck %s
|
|
// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv6-unknown-bitrig | FileCheck %s
|