clang/AMDGPU: Enable opencl 2.0 features for unknown target (#170308)

Assume amdhsa triples support flat addressing, which matches
the backend logic for the default target. This fixes the
rocm device-libs build.

Author: arsenm

clang/lib/Basic/Targets/AMDGPU.h

@@ -84,6 +84,18 @@ class LLVM_LIBRARY_VISIBILITY AMDGPUTargetInfo final : public TargetInfo {
     return TT.getArch() == llvm::Triple::r600;
   }
 
+  bool hasFlatSupport() const {
+    if (GPUKind >= llvm::AMDGPU::GK_GFX700)
+      return true;
+
+    // Dummy target is assumed to be gfx700+ for amdhsa.
+    if (GPUKind == llvm::AMDGPU::GK_NONE &&
+        getTriple().getOS() == llvm::Triple::AMDHSA)
+      return true;
+
+    return false;
+  }
+
 public:
   AMDGPUTargetInfo(const llvm::Triple &Triple, const TargetOptions &Opts);
 
@@ -325,7 +337,7 @@ class LLVM_LIBRARY_VISIBILITY AMDGPUTargetInfo final : public TargetInfo {
       Opts["__opencl_c_atomic_order_seq_cst"] = true;
       Opts["__opencl_c_atomic_scope_all_devices"] = true;
 
-      if (GPUKind >= llvm::AMDGPU::GK_GFX700) {
+      if (hasFlatSupport()) {
         Opts["__opencl_c_generic_address_space"] = true;
         Opts["__opencl_c_device_enqueue"] = true;
       }

clang/test/CodeGenOpenCL/address-spaces.cl

@@ -2,9 +2,10 @@
 // RUN: %clang_cc1 %s -O0 -cl-std=CL3.0 -cl-ext=-all -ffake-address-space-map -emit-llvm -o - | FileCheck %s --check-prefixes=CHECK,SPIR
 // RUN: %clang_cc1 %s -O0 -cl-std=clc++2021 -cl-ext=-all -ffake-address-space-map -emit-llvm -o - | FileCheck %s --check-prefixes=CHECK,SPIR
 // RUN: %clang_cc1 %s -O0 -DCL20 -cl-std=CL2.0 -ffake-address-space-map -emit-llvm -o - | FileCheck %s --check-prefixes=CL20,CL20SPIR
-// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-amdhsa -emit-llvm -o - | FileCheck --check-prefixes=CHECK,AMDGCN %s
-// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-amdhsa -cl-std=CL3.0 -emit-llvm -o - | FileCheck --check-prefixes=CHECK,AMDGCN %s
+// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-mesa3d -emit-llvm -o - | FileCheck --check-prefixes=CHECK,AMDGCN %s
+// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-mesa3d -cl-std=CL3.0 -emit-llvm -o - | FileCheck --check-prefixes=CHECK,AMDGCN %s
 // RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-amdhsa -DCL20 -cl-std=CL2.0 -emit-llvm -o - | FileCheck %s --check-prefixes=CL20,CL20AMDGCN
+// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-amdhsa -DCL20 -cl-std=CL3.0 -emit-llvm -o - | FileCheck %s --check-prefixes=CL20,CL20AMDGCN
 // RUN: %clang_cc1 %s -O0 -triple amdgcn-mesa-mesa3d -emit-llvm -o - | FileCheck --check-prefixes=CHECK,AMDGCN %s
 // RUN: %clang_cc1 %s -O0 -triple amdgcn-mesa-mesa3d -cl-std=CL3.0 -emit-llvm -o - | FileCheck --check-prefixes=CHECK,AMDGCN %s
 // RUN: %clang_cc1 %s -O0 -triple r600-- -emit-llvm -o - | FileCheck --check-prefixes=CHECK,AMDGCN %s

clang/test/CodeGenOpenCL/builtins-alloca.cl

@@ -3,9 +3,9 @@
 // RUN:     -emit-llvm -o - | FileCheck --check-prefixes=OPENCL12 %s
 // RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-amdhsa -cl-std=CL2.0 \
 // RUN:     -emit-llvm -o - | FileCheck --check-prefixes=OPENCL20 %s
-// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-amdhsa -cl-std=CL3.0 \
+// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-mesa3d -target-cpu gfx600 -cl-std=CL3.0 \
 // RUN:     -emit-llvm -o - | FileCheck --check-prefixes=OPENCL30 %s
-// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-amdhsa -cl-std=CL3.0 -cl-ext=+__opencl_c_generic_address_space \
+// RUN: %clang_cc1 %s -O0 -triple amdgcn-amd-amdhsa -cl-std=CL3.0 \
 // RUN:     -emit-llvm -o - | FileCheck --check-prefixes=OPENCL30GAS %s
 
 // OPENCL-LABEL: define dso_local void @test1_builtin_alloca(

clang/test/Misc/amdgcn.languageOptsOpenCL.cl

@@ -11,6 +11,9 @@
 // RUN: %clang_cc1 -x cl -cl-std=CL3.0 %s -verify -triple amdgcn-unknown-unknown -Wpedantic-core-features -DTEST_CORE_FEATURES
 // RUN: %clang_cc1 -x cl -cl-std=CL3.0 %s -verify -triple amdgcn-unknown-unknown -target-cpu gfx700 -Wpedantic-core-features -DTEST_CORE_FEATURES -DFLAT_SUPPORT
 
+// Test none target with amdhsa triple, which implies >= gfx700
+// RUN: %clang_cc1 -x cl -cl-std=CL3.0 %s -verify -triple amdgcn-unknown-amdhsa -Wpedantic-core-features -DTEST_CORE_FEATURES -DFLAT_SUPPORT
+
 // Extensions in all versions
 #ifndef cl_clang_storage_class_specifiers
 #error "Missing cl_clang_storage_class_specifiers define"