Revert "AMDGPU: bump AS.MAX_COMMON_ADDRESS to 6 since 32-bit addr space"

As it introduces out of bound access.

This reverts commit r340172 and r340171

llvm-svn: 340202

Author: vitalybuka

llvm/lib/Target/AMDGPU/AMDGPU.h

@@ -229,7 +229,7 @@ struct AMDGPUAS {
 
   enum : unsigned {
     // The maximum value for flat, generic, local, private, constant and region.
-    MAX_COMMON_ADDRESS = 6,
+    MAX_COMMON_ADDRESS = 5,
 
     GLOBAL_ADDRESS = 1,   ///< Address space for global memory (RAT0, VTX0).
     CONSTANT_ADDRESS = 4, ///< Address space for constant memory (VTX2)

llvm/lib/Target/AMDGPU/AMDGPUAliasAnalysis.cpp

@@ -69,7 +69,7 @@ AMDGPUAAResult::ASAliasRulesTy::ASAliasRulesTy(AMDGPUAS AS_, Triple::ArchType Ar
   /* Region   */ {MayAlias, NoAlias , NoAlias , NoAlias,  MayAlias, NoAlias},
   /* Private  */ {MayAlias, NoAlias , NoAlias , NoAlias , NoAlias , MayAlias}
   };
-  static_assert(AMDGPUAS::MAX_COMMON_ADDRESS <= 6, "Addr space out of range");
+  assert(AS.MAX_COMMON_ADDRESS <= 5);
   if (AS.FLAT_ADDRESS == 0) {
     assert(AS.GLOBAL_ADDRESS   == 1 &&
            AS.REGION_ADDRESS   == 2 &&

llvm/test/CodeGen/AMDGPU/amdgpu-alias-analysis.ll

@@ -7,9 +7,3 @@ define void @test(i8 addrspace(5)* %p, i8 addrspace(1)* %p1) {
   ret void
 }
 
-; CHECK: NoAlias:      i8 addrspace(1)* %p1, i8 addrspace(6)* %p
-
-define void @test_32bit_addr_space(i8 addrspace(6)* %p, i8 addrspace(1)* %p1) {
-  ret void
-}
-