Local: Handle noalias_addrspace in combineMetadata

This should act like range.

Author: arsenm

llvm/lib/Transforms/Utils/Local.cpp

@@ -3391,6 +3391,10 @@ void llvm::combineMetadata(Instruction *K, const Instruction *J,
         if (DoesKMove)
           K->setMetadata(Kind, MDNode::getMergedProfMetadata(KMD, JMD, K, J));
         break;
+      case LLVMContext::MD_noalias_addrspace:
+        if (DoesKMove)
+          K->setMetadata(Kind, MDNode::getMostGenericRange(JMD, KMD));
+        break;
     }
   }
   // Set !invariant.group from J if J has it. If both instructions have it
@@ -3432,7 +3436,8 @@ void llvm::combineMetadataForCSE(Instruction *K, const Instruction *J,
                          LLVMContext::MD_prof,
                          LLVMContext::MD_nontemporal,
                          LLVMContext::MD_noundef,
-                         LLVMContext::MD_mmra};
+                         LLVMContext::MD_mmra,
+                         LLVMContext::MD_noalias_addrspace};
   combineMetadata(K, J, KnownIDs, KDominatesJ);
 }
 

llvm/test/Transforms/SimplifyCFG/hoist-with-metadata.ll

@@ -319,7 +319,7 @@ out:
 define void @hoist_noalias_addrspace_both(i1 %c, ptr %p, i64 %val) {
 ; CHECK-LABEL: @hoist_noalias_addrspace_both(
 ; CHECK-NEXT:  if:
-; CHECK-NEXT:    [[T:%.*]] = atomicrmw add ptr [[P:%.*]], i64 [[VAL:%.*]] seq_cst, align 8
+; CHECK-NEXT:    [[T:%.*]] = atomicrmw add ptr [[P:%.*]], i64 [[VAL:%.*]] seq_cst, align 8, !noalias.addrspace [[META7:![0-9]+]]
 ; CHECK-NEXT:    ret void
 ;
 if:
@@ -361,7 +361,7 @@ out:
 define void @hoist_noalias_addrspace_switch(i64 %i, ptr %p, i64 %val) {
 ; CHECK-LABEL: @hoist_noalias_addrspace_switch(
 ; CHECK-NEXT:  out:
-; CHECK-NEXT:    [[T:%.*]] = atomicrmw add ptr [[P:%.*]], i64 [[VAL:%.*]] seq_cst, align 8
+; CHECK-NEXT:    [[T:%.*]] = atomicrmw add ptr [[P:%.*]], i64 [[VAL:%.*]] seq_cst, align 8, !noalias.addrspace [[META8:![0-9]+]]
 ; CHECK-NEXT:    ret void
 ;
   switch i64 %i, label %bb0 [
@@ -398,4 +398,6 @@ out:
 ; CHECK: [[RNG4]] = !{i32 0, i32 10}
 ; CHECK: [[META5]] = !{i64 4}
 ; CHECK: [[META6]] = !{float 2.500000e+00}
+; CHECK: [[META7]] = !{i32 5, i32 6}
+; CHECK: [[META8]] = !{i32 4, i32 8}
 ;.