AMDGPU: Make 0 the private nullptr value

We can't actually pretend that 0 is valid for address space 0.
r295877 added a workaround to stop allocating user objects
there, so we can use 0 as the invalid pointer.

Some of the tests seemed to be using private as the non-0 null
test address space, so add copies using local to make sure
this is still stressed.

llvm-svn: 297659

1 files changed, 1 insertions, 1 deletions

diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index e23ff3cc380..21d9ea13ea9 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -2298,7 +2298,7 @@ public:
   // address space has value 0 but in private and local address space has
   // value ~0.
   uint64_t getNullPointerValue(unsigned AS) const override {
-    return AS != LangAS::opencl_local && AS != 0 ? 0 : ~0;
+    return AS == LangAS::opencl_local ? ~0 : 0;
   }
 };