diff options
| author | Tim Northover <tnorthover@apple.com> | 2017-04-20 21:56:52 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2017-04-20 21:56:52 +0000 |
| commit | 46e58354daa0e6508a25e3e74b926b8eb6374ccd (patch) | |
| tree | 65a5169ec9c375748b55a07b92fcab15777388ed /llvm/test/CodeGen | |
| parent | 906ffb7b8f8e5cb767a4083a44f69684bb42f3ae (diff) | |
| download | bcm5719-llvm-46e58354daa0e6508a25e3e74b926b8eb6374ccd.tar.gz bcm5719-llvm-46e58354daa0e6508a25e3e74b926b8eb6374ccd.zip | |
ARM: lower "fence singlethread" to a pure compiler barrier.
Single-threaded fences aren't required to provide any synchronization with
other processing elements so there's no need for a DMB. They should still be a
barrier for compiler optimizations though.
llvm-svn: 300904
Diffstat (limited to 'llvm/test/CodeGen')
| -rw-r--r-- | llvm/test/CodeGen/ARM/fence-singlethread.ll | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/llvm/test/CodeGen/ARM/fence-singlethread.ll b/llvm/test/CodeGen/ARM/fence-singlethread.ll new file mode 100644 index 00000000000..ec032ccac42 --- /dev/null +++ b/llvm/test/CodeGen/ARM/fence-singlethread.ll @@ -0,0 +1,16 @@ +; RUN: llc -mtriple=thumbv7-linux-gnueabihf %s -o - | FileCheck %s +; RUN: llc -mtriple=thumbv7-apple-ios %s -o - | FileCheck %s +; RUN: llc -mtriple=thumbv7-linux-gnueabihf %s -filetype=obj -o %t +; RUN: llvm-objdump -d %t | FileCheck %s --check-prefix=OBJ + +; OBJ-NOT: dmb + +define void @fence_singlethread() { +; CHECK-LABEL: fence_singlethread: +; CHECK-NOT: dmb +; CHECK: @ COMPILER BARRIER +; CHECK-NOT: dmb + + fence singlethread seq_cst + ret void +} |
