[AMDGPU] Remove use of OpenCL triple environment and replace with function attribute for AMDGPU (CLANG)

- Remove use of the opencl and amdopencl environment member of the target triple for the AMDGPU target.
- Use a function attribute to communicate to the AMDGPU backend.

Differential Revision: https://reviews.llvm.org/D43735

llvm-svn: 328347

1 files changed, 5 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/TargetInfo.cpp b/clang/lib/CodeGen/TargetInfo.cpp
index 01eb6ead163..435565dce3f 100644
--- a/clang/lib/CodeGen/TargetInfo.cpp
+++ b/clang/lib/CodeGen/TargetInfo.cpp
@@ -7661,6 +7661,11 @@ void AMDGPUTargetCodeGenInfo::setTargetAttributes(
 
   const auto *ReqdWGS = M.getLangOpts().OpenCL ?
     FD->getAttr<ReqdWorkGroupSizeAttr>() : nullptr;
+
+  if (M.getLangOpts().OpenCL && FD->hasAttr<OpenCLKernelAttr>() &&
+      (M.getTriple().getOS() == llvm::Triple::AMDHSA))
+    F->addFnAttr("amdgpu-implicitarg-num-bytes", "32");
+
   const auto *FlatWGS = FD->getAttr<AMDGPUFlatWorkGroupSizeAttr>();
   if (ReqdWGS || FlatWGS) {
     unsigned Min = FlatWGS ? FlatWGS->getMin() : 0;