--- /dev/null
+// NOTE: Assertions have been autogenerated by utils/update_cc_test_checks.py UTC_ARGS: --function-signature
+// REQUIRES: avr-registered-target
+// RUN: %clang_cc1 -triple avr-- -Wno-strict-prototypes -Wno-deprecated-non-prototype -emit-llvm -o - -verify %s | FileCheck %s
+// expected-no-diagnostics
+
+// Make sure redeclarations of functions as a different type work when functions
+// use non-0 address spaces.
+
+int g();
+
+// CHECK-LABEL: define {{[^@]+}}@bar
+// CHECK-SAME: (i16 noundef [[I:%.*]], i16 noundef [[J:%.*]]) addrspace(1) #[[ATTR0:[0-9]+]] {
+// CHECK-NEXT: entry:
+// CHECK-NEXT: [[I_ADDR:%.*]] = alloca i16, align 1
+// CHECK-NEXT: [[J_ADDR:%.*]] = alloca i16, align 1
+// CHECK-NEXT: store i16 [[I]], ptr [[I_ADDR]], align 1
+// CHECK-NEXT: store i16 [[J]], ptr [[J_ADDR]], align 1
+// CHECK-NEXT: [[TMP0:%.*]] = load i16, ptr [[I_ADDR]], align 1
+// CHECK-NEXT: [[TMP1:%.*]] = load i16, ptr [[J_ADDR]], align 1
+// CHECK-NEXT: [[CALL:%.*]] = call addrspace(1) i16 @g(i16 noundef [[TMP0]], i16 noundef [[TMP1]])
+// CHECK-NEXT: ret i16 [[CALL]]
+//
+int bar(int i, int j) {
+ return g(i, j);
+}
+
+// CHECK-LABEL: define {{[^@]+}}@foo
+// CHECK-SAME: (i16 noundef [[I:%.*]]) addrspace(1) #[[ATTR0]] {
+// CHECK-NEXT: entry:
+// CHECK-NEXT: [[I_ADDR:%.*]] = alloca i16, align 1
+// CHECK-NEXT: store i16 [[I]], ptr [[I_ADDR]], align 1
+// CHECK-NEXT: [[TMP0:%.*]] = load i16, ptr [[I_ADDR]], align 1
+// CHECK-NEXT: [[CALL:%.*]] = call addrspace(1) i16 @g(i16 noundef [[TMP0]])
+// CHECK-NEXT: ret i16 [[CALL]]
+//
+int foo(int i) {
+ return g(i);
+}
+
+// CHECK-LABEL: define {{[^@]+}}@g
+// CHECK-SAME: (i16 noundef [[X:%.*]], i16 noundef [[Y:%.*]]) addrspace(1) #[[ATTR0]] {
+// CHECK-NEXT: entry:
+// CHECK-NEXT: [[X_ADDR:%.*]] = alloca i16, align 1
+// CHECK-NEXT: [[Y_ADDR:%.*]] = alloca i16, align 1
+// CHECK-NEXT: store i16 [[X]], ptr [[X_ADDR]], align 1
+// CHECK-NEXT: store i16 [[Y]], ptr [[Y_ADDR]], align 1
+// CHECK-NEXT: [[TMP0:%.*]] = load i16, ptr [[X_ADDR]], align 1
+// CHECK-NEXT: [[TMP1:%.*]] = load i16, ptr [[Y_ADDR]], align 1
+// CHECK-NEXT: [[ADD:%.*]] = add nsw i16 [[TMP0]], [[TMP1]]
+// CHECK-NEXT: ret i16 [[ADD]]
+//
+int g(int x, int y) {
+ return x + y;
+}