Addrspacecasts are no-ops on ARM.

Testcase added.

llvm-svn: 196269

llvm/lib/Target/ARM/ARMISelLowering.h

@@ -361,6 +361,12 @@ namespace llvm {
     /// be used for loads / stores from the global.
     virtual unsigned getMaximalGlobalOffset() const;
 
+    /// Returns true if a cast between SrcAS and DestAS is a noop.
+    virtual bool isNoopAddrSpaceCast(unsigned SrcAS, unsigned DestAS) const {
+      // Addrspacecasts are always noops.
+      return true;
+    }
+
     /// createFastISel - This method returns a target specific FastISel object,
     /// or null if the target does not support "fast" ISel.
     virtual FastISel *createFastISel(FunctionLoweringInfo &funcInfo,

llvm/test/CodeGen/ARM/addrspacecast.ll

@@ -0,0 +1,7 @@
+; RUN: llc < %s -march=arm
+
+; Check that codegen for an addrspace cast succeeds without error.
+define <4 x i32 addrspace(1)*> @f (<4 x i32*> %x) {
+  %1 = addrspacecast <4 x i32*> %x to <4 x i32 addrspace(1)*>
+  ret <4 x i32 addrspace(1)*> %1
+}