r287006 - [AMDGPU] Add wave barrier builtin

[Stanislav Mekhanoshin via cfe-commits]

Author: rampitec
Date: Tue Nov 15 12:58:03 2016
New Revision: 287006

URL: http://llvm.org/viewvc/llvm-project?rev=287006&view=rev
Log:
[AMDGPU] Add wave barrier builtin

The wave barrier represents the discardable barrier. Its main purpose is to
carry convergent attribute, thus preventing illegal CFG optimizations. All lanes
in a wave come to convergence point simultaneously with SIMT, thus no special
instruction is needed in the ISA. The barrier is discarded during code generation.

Differential Revision: https://reviews.llvm.org/D26584

Modified:
    cfe/trunk/include/clang/Basic/BuiltinsAMDGPU.def
    cfe/trunk/test/CodeGenOpenCL/builtins-amdgcn.cl

Modified: cfe/trunk/include/clang/Basic/BuiltinsAMDGPU.def
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/include/clang/Basic/BuiltinsAMDGPU.def?rev=287006&r1=287005&r2=287006&view=diff
==============================================================================
--- cfe/trunk/include/clang/Basic/BuiltinsAMDGPU.def (original)
+++ cfe/trunk/include/clang/Basic/BuiltinsAMDGPU.def Tue Nov 15 12:58:03 2016
@@ -36,6 +36,7 @@ BUILTIN(__builtin_amdgcn_workitem_id_z,
 // Instruction builtins.
 //===----------------------------------------------------------------------===//
 BUILTIN(__builtin_amdgcn_s_barrier, "v", "n")
+BUILTIN(__builtin_amdgcn_wave_barrier, "v", "n")
 BUILTIN(__builtin_amdgcn_div_scale, "dddbb*", "n")
 BUILTIN(__builtin_amdgcn_div_scalef, "fffbb*", "n")
 BUILTIN(__builtin_amdgcn_div_fmas, "ddddb", "nc")

Modified: cfe/trunk/test/CodeGenOpenCL/builtins-amdgcn.cl
URL: http://llvm.org/viewvc/llvm-project/cfe/trunk/test/CodeGenOpenCL/builtins-amdgcn.cl?rev=287006&r1=287005&r2=287006&view=diff
==============================================================================
--- cfe/trunk/test/CodeGenOpenCL/builtins-amdgcn.cl (original)
+++ cfe/trunk/test/CodeGenOpenCL/builtins-amdgcn.cl Tue Nov 15 12:58:03 2016
@@ -270,6 +270,13 @@ void test_s_barrier()
   __builtin_amdgcn_s_barrier();
 }
 
+// CHECK-LABEL: @test_wave_barrier
+// CHECK: call void @llvm.amdgcn.wave.barrier(
+void test_wave_barrier()
+{
+  __builtin_amdgcn_wave_barrier();
+}
+
 // CHECK-LABEL: @test_s_memtime
 // CHECK: call i64 @llvm.amdgcn.s.memtime()
 void test_s_memtime(global ulong* out)