Local: Handle noalias.addrspace in copyMetadataForLoad (#103939)

Author: arsenm

llvm/lib/Transforms/Utils/Local.cpp

@@ -3474,6 +3474,7 @@ void llvm::copyMetadataForLoad(LoadInst &Dest, const LoadInst &Source) {
     case LLVMContext::MD_mem_parallel_loop_access:
     case LLVMContext::MD_access_group:
     case LLVMContext::MD_noundef:
+    case LLVMContext::MD_noalias_addrspace:
       // All of these directly apply.
       Dest.setMetadata(ID, N);
       break;

llvm/test/Transforms/InstCombine/loadstore-metadata.ll

@@ -174,10 +174,10 @@ define i32 @test_load_cast_combine_noundef(ptr %ptr) {
 }
 
 define i32 @test_load_cast_combine_noalias_addrspace(ptr %ptr) {
-; Ensure (cast (load (...))) -> (load (cast (...))) preserves TBAA.
+; Ensure (cast (load (...))) -> (load (cast (...))) preserves noalias.addrspace.
 ; CHECK-LABEL: @test_load_cast_combine_noalias_addrspace(
 ; CHECK-NEXT:  entry:
-; CHECK-NEXT:    [[L1:%.*]] = load i32, ptr [[PTR:%.*]], align 4
+; CHECK-NEXT:    [[L1:%.*]] = load i32, ptr [[PTR:%.*]], align 4, !noalias.addrspace [[META10:![0-9]+]]
 ; CHECK-NEXT:    ret i32 [[L1]]
 ;
 entry: