[libclc] 66/291: Implement barrier() builtin

[Andreas Beckmann]

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anbe pushed a commit to branch master
in repository libclc.

commit efd6599fc741c849dfce8e1e312e28fb33857315
Author: Tom Stellard <thomas.stellard at amd.com>
Date:   Mon Jul 8 17:26:39 2013 +0000

    Implement barrier() builtin
    
    Reviewed and Tested-by: Aaron Watry <awatry at gmail.com>
    
    git-svn-id: https://llvm.org/svn/llvm-project/libclc/trunk@185837 91177308-0d34-0410-b5e6-96231b3b80d8
---
 r600/lib/SOURCES                         |  2 ++
 r600/lib/synchronization/barrier.cl      | 15 +++++++++++++++
 r600/lib/synchronization/barrier_impl.ll | 12 ++++++++++++
 3 files changed, 29 insertions(+)

diff --git a/r600/lib/SOURCES b/r600/lib/SOURCES
index af8c8c8..16ef3ac 100644
--- a/r600/lib/SOURCES
+++ b/r600/lib/SOURCES
@@ -2,3 +2,5 @@ workitem/get_group_id.ll
 workitem/get_local_size.ll
 workitem/get_local_id.ll
 workitem/get_global_size.ll
+synchronization/barrier.cl
+synchronization/barrier_impl.ll
diff --git a/r600/lib/synchronization/barrier.cl b/r600/lib/synchronization/barrier.cl
new file mode 100644
index 0000000..ac0b4b3
--- /dev/null
+++ b/r600/lib/synchronization/barrier.cl
@@ -0,0 +1,15 @@
+
+#include <clc/clc.h>
+
+void barrier_local(void);
+void barrier_global(void);
+
+void barrier(cl_mem_fence_flags flags) {
+  if (flags & CLK_LOCAL_MEM_FENCE) {
+    barrier_local();
+  }
+
+  if (flags & CLK_GLOBAL_MEM_FENCE) {
+    barrier_global();
+  }
+}
diff --git a/r600/lib/synchronization/barrier_impl.ll b/r600/lib/synchronization/barrier_impl.ll
new file mode 100644
index 0000000..99ac018
--- /dev/null
+++ b/r600/lib/synchronization/barrier_impl.ll
@@ -0,0 +1,12 @@
+declare void @llvm.AMDGPU.barrier.local() nounwind
+declare void @llvm.AMDGPU.barrier.global() nounwind
+
+define void @barrier_local() nounwind alwaysinline {
+  call void @llvm.AMDGPU.barrier.local()
+  ret void
+}
+
+define void @barrier_global() nounwind alwaysinline {
+  call void @llvm.AMDGPU.barrier.global()
+  ret void
+}

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