[HIP] Add hip input kind and codegen for kernel launching

HIP is a language similar to CUDA (https://github.com/ROCm-Developer-Tools/HIP/blob/master/docs/markdown/hip_kernel_language.md ).
The language syntax is very similar, which allows a hip program to be compiled as a CUDA program by Clang. The main difference
is the host API. HIP has a set of vendor neutral host API which can be implemented on different platforms. Currently there is open source
implementation of HIP runtime on amdgpu target (https://github.com/ROCm-Developer-Tools/HIP).

This patch adds support of input kind and language standard hip.

When hip file is compiled, both LangOpts.CUDA and LangOpts.HIP is turned on. This allows compilation of hip program as CUDA
in most cases and only special handling of hip program is needed LangOpts.HIP is checked.

This patch also adds support of kernel launching of HIP program using HIP host API.

When -x hip is not specified, there is no behaviour change for CUDA.

Patch by Greg Rodgers.
Revised and lit test added by Yaxun Liu.

Differential Revision: https://reviews.llvm.org/D44984


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@330790 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 1 deletions

diff --git a/lib/Frontend/CompilerInvocation.cpp b/lib/Frontend/CompilerInvocation.cpp
index c516738fb7..f2f22ee2c3 100644
--- a/lib/Frontend/CompilerInvocation.cpp
+++ b/lib/Frontend/CompilerInvocation.cpp
@@ -1608,6 +1608,7 @@ static InputKind ParseFrontendArgs(FrontendOptions &Opts, ArgList &Args,
                 .Case("c", InputKind::C)
                 .Case("cl", InputKind::OpenCL)
                 .Case("cuda", InputKind::CUDA)
+                .Case("hip", InputKind::HIP)
                 .Case("c++", InputKind::CXX)
                 .Case("objective-c", InputKind::ObjC)
                 .Case("objective-c++", InputKind::ObjCXX)
@@ -1887,6 +1888,9 @@ void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
     case InputKind::RenderScript:
       LangStd = LangStandard::lang_c99;
       break;
+    case InputKind::HIP:
+      LangStd = LangStandard::lang_hip;
+      break;
     }
   }
 
@@ -1934,7 +1938,8 @@ void CompilerInvocation::setLangDefaults(LangOptions &Opts, InputKind IK,
     }
   }
 
-  Opts.CUDA = IK.getLanguage() == InputKind::CUDA;
+  Opts.HIP = IK.getLanguage() == InputKind::HIP;
+  Opts.CUDA = IK.getLanguage() == InputKind::CUDA || Opts.HIP;
   if (Opts.CUDA)
     // Set default FP_CONTRACT to FAST.
     Opts.setDefaultFPContractMode(LangOptions::FPC_Fast);
@@ -2005,6 +2010,10 @@ static bool IsInputCompatibleWithStandard(InputKind IK,
     return S.getLanguage() == InputKind::CUDA ||
            S.getLanguage() == InputKind::CXX;
 
+  case InputKind::HIP:
+    return S.getLanguage() == InputKind::CXX ||
+           S.getLanguage() == InputKind::HIP;
+
   case InputKind::Asm:
     // Accept (and ignore) all -std= values.
     // FIXME: The -std= value is not ignored; it affects the tokenization
@@ -2032,6 +2041,8 @@ static const StringRef GetInputKindName(InputKind IK) {
     return "CUDA";
   case InputKind::RenderScript:
     return "RenderScript";
+  case InputKind::HIP:
+    return "HIP";
 
   case InputKind::Asm:
     return "Asm";