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Emit native implementations of atomic operations on FreeBSD/armv6. 

Just like on Linux, FreeBSD/armv6 assumes the system supports
ldrex/strex unconditionally. It is also used by the kernel. We can
therefore enable support for it, like we do on Linux.

While there, change one of the unit tests to explicitly test against
armv5 instead of armv7, as it actually tests whether libcalls are
emitted.

llvm-svn: 184040
This commit is contained in:
Ed Schouten 2013-06-15 09:40:14 +00:00
parent 8e8415f5ab
commit 60afa2d923
3 changed files with 4 additions and 3 deletions
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4
clang/lib/Basic/Targets.cpp
View File

@ -3534,8 +3534,8 @@ class ARMTargetInfo : public TargetInfo {
// 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;
if (T.getOS() != llvm::Triple::Linux && T.getOS() != llvm::Triple::FreeBSD)
return false;
StringRef ArchName = T.getArchName();
if (T.getArch() == llvm::Triple::arm) {
if (!ArchName.startswith("armv"))

2
clang/test/CodeGen/c11atomics.c
View File

@ -1,4 +1,4 @@
// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv7-unknown-freebsd -std=c11 | FileCheck %s
// RUN: %clang_cc1 %s -emit-llvm -o - -triple=armv5-unknown-freebsd -std=c11 | FileCheck %s
// Test that we are generating atomicrmw instructions, rather than
// compare-exchange loops for common atomic ops. This makes a big difference

1
clang/test/CodeGen/linux-arm-atomic.c
View File

@ -1,6 +1,7 @@
// 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
typedef int _Atomic_word;
_Atomic_word exchange_and_add(volatile _Atomic_word *__mem, int __val) {