[AMDGPU] Get address space mapping by target triple environment

As we introduced target triple environment amdgiz and amdgizcl, the address
space values are no longer enums. We have to decide the value by target triple.

The basic idea is to use struct AMDGPUAS to represent address space values.
For address space values which are not depend on target triple, use static
const members, so that they don't occupy extra memory space and is equivalent
to a compile time constant.

Since the struct is lightweight and cheap, it can be created on the fly at
the point of usage. Or it can be added as member to a pass and created at
the beginning of the run* function.

Differential Revision: https://reviews.llvm.org/D31284

llvm-svn: 298846

1 files changed, 6 insertions, 6 deletions

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h
index e36e940532c..934bf7f31ba 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.h
@@ -35,6 +35,7 @@ class AMDGPUTargetMachine : public LLVMTargetMachine {
 protected:
   std::unique_ptr<TargetLoweringObjectFile> TLOF;
   AMDGPUIntrinsicInfo IntrinsicInfo;
+  AMDGPUAS AS;
 
   StringRef getGPUName(const Function &F) const;
   StringRef getFeatureString(const Function &F) const;
@@ -57,17 +58,16 @@ public:
   TargetLoweringObjectFile *getObjFileLowering() const override {
     return TLOF.get();
   }
+  AMDGPUAS getAMDGPUAS() const {
+    return AS;
+  }
 
   void adjustPassManager(PassManagerBuilder &) override;
   /// Get the integer value of a null pointer in the given address space.
   uint64_t getNullPointerValue(unsigned AddrSpace) const {
-    switch(AddrSpace) {
-    case AMDGPUAS::LOCAL_ADDRESS:
-    case AMDGPUAS::REGION_ADDRESS:
+    if (AddrSpace == AS.LOCAL_ADDRESS || AddrSpace == AS.REGION_ADDRESS)
       return -1;
-    default:
-      return 0;
-    }
+    return 0;
   }
 
 };