Coroutines: Handle non-zero stack address space (#67092)

The stack might be in a different address space, in which case, bitcast
does not work. We should use addrspacecast. As we do not support typed
pointer anymore, so we do not need a bitcast here anymore.

Author: ruiling

llvm/lib/Transforms/Coroutines/CoroFrame.cpp

@@ -1766,8 +1766,8 @@ static void insertSpills(const FrameDataInfo &FrameData, coro::Shape &Shape) {
       // Note: If we change the strategy dealing with alignment, we need to refine
       // this casting.
       if (GEP->getType() != Orig->getType())
-        return Builder.CreateBitCast(GEP, Orig->getType(),
-                                     Orig->getName() + Twine(".cast"));
+        return Builder.CreateAddrSpaceCast(GEP, Orig->getType(),
+                                           Orig->getName() + Twine(".cast"));
     }
     return GEP;
   };

llvm/test/Transforms/Coroutines/coro-alloca-with-addrspace.ll

@@ -0,0 +1,57 @@
+; RUN: opt < %s -passes='cgscc(coro-split)' -S | FileCheck %s
+
+define ptr @f(i1 %n) presplitcoroutine {
+entry:
+  %x = alloca i64, addrspace(5)
+  %y = alloca i64, addrspace(5)
+  %id = call token @llvm.coro.id(i32 0, ptr null, ptr null, ptr null)
+  %size = call i32 @llvm.coro.size.i32()
+  %alloc = call ptr @malloc(i32 %size)
+  %hdl = call ptr @llvm.coro.begin(token %id, ptr %alloc)
+  br i1 %n, label %flag_true, label %flag_false
+
+flag_true:
+  br label %merge
+
+flag_false:
+  br label %merge
+
+merge:
+  %alias_phi = phi ptr addrspace(5) [ %x, %flag_true ], [ %y, %flag_false ]
+  %sp1 = call i8 @llvm.coro.suspend(token none, i1 false)
+  switch i8 %sp1, label %suspend [i8 0, label %resume
+                                  i8 1, label %cleanup]
+resume:
+  call void @print(ptr addrspace(5) %alias_phi)
+  br label %cleanup
+
+cleanup:
+  %mem = call ptr @llvm.coro.free(token %id, ptr %hdl)
+  call void @free(ptr %mem)
+  br label %suspend
+
+suspend:
+  call i1 @llvm.coro.end(ptr %hdl, i1 0)
+  ret ptr %hdl
+}
+
+; CHECK-LABEL: @f(
+; CHECK:  [[X_ADDR:%[0-9]+]] = getelementptr inbounds %f.Frame, ptr %hdl, i32 0, i32 2
+; CHECK:  %x.reload.addr = addrspacecast ptr [[X_ADDR]] to ptr addrspace(5)
+; CHECK:  [[Y_ADDR:%[0-9]+]] = getelementptr inbounds %f.Frame, ptr %hdl, i32 0, i32 3
+; CHECK:  %y.reload.addr = addrspacecast ptr [[Y_ADDR]] to ptr addrspace(5)
+
+declare ptr @llvm.coro.free(token, ptr)
+declare i32 @llvm.coro.size.i32()
+declare i8  @llvm.coro.suspend(token, i1)
+declare void @llvm.coro.resume(ptr)
+declare void @llvm.coro.destroy(ptr)
+
+declare token @llvm.coro.id(i32, ptr, ptr, ptr)
+declare i1 @llvm.coro.alloc(token)
+declare ptr @llvm.coro.begin(token, ptr)
+declare i1 @llvm.coro.end(ptr, i1)
+
+declare void @print(ptr)
+declare noalias ptr @malloc(i32)
+declare void @free(ptr)