[AVR][test] Add a new test: functions with struct return type

llvm/test/CodeGen/AVR/struct.ll

+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
+; RUN: llc -mtriple=avr < %s | FileCheck %s --check-prefix=CHECKA
+; RUN: llc -mtriple=avr -mattr=+movw < %s | FileCheck %s --check-prefix=CHECKB
+
+%struct.s10 = type { i16, i16, i16, i16, i16 }
+%struct.s06 = type { i16, i16, i16 }
+%struct.s04 = type { i16, i16 }
+
+define void @foo10(%struct.s10* sret(%struct.s10) %0, i16 %1, i16 %2, i16 %3) addrspace(1) {
+; CHECKA-LABEL: foo10:
+; CHECKA:       ; %bb.0:
+; CHECKA-NEXT:    mov r30, r24
+; CHECKA-NEXT:    mov r31, r25
+; CHECKA-NEXT:    std Z+4, r22
+; CHECKA-NEXT:    std Z+5, r23
+; CHECKA-NEXT:    std Z+2, r20
+; CHECKA-NEXT:    std Z+3, r21
+; CHECKA-NEXT:    st Z, r18
+; CHECKA-NEXT:    std Z+1, r19
+; CHECKA-NEXT:    ret
+;
+; CHECKB-LABEL: foo10:
+; CHECKB:       ; %bb.0:
+; CHECKB-NEXT:    movw r30, r24
+; CHECKB-NEXT:    std Z+4, r22
+; CHECKB-NEXT:    std Z+5, r23
+; CHECKB-NEXT:    std Z+2, r20
+; CHECKB-NEXT:    std Z+3, r21
+; CHECKB-NEXT:    st Z, r18
+; CHECKB-NEXT:    std Z+1, r19
+; CHECKB-NEXT:    ret
+  %5 = getelementptr inbounds %struct.s10, %struct.s10* %0, i16 0, i32 0
+  store i16 %3, i16* %5
+  %6 = getelementptr inbounds %struct.s10, %struct.s10* %0, i16 0, i32 1
+  store i16 %2, i16* %6
+  %7 = getelementptr inbounds %struct.s10, %struct.s10* %0, i16 0, i32 2
+  store i16 %1, i16* %7
+  ret void
+}
+
+define %struct.s06 @foo06(i16 %0, i16 %1, i16 %2) addrspace(1) {
+; CHECKA-LABEL: foo06:
+; CHECKA:       ; %bb.0:
+; CHECKA-NEXT:    mov r30, r20
+; CHECKA-NEXT:    mov r31, r21
+; CHECKA-NEXT:    mov r20, r22
+; CHECKA-NEXT:    mov r21, r23
+; CHECKA-NEXT:    mov r18, r24
+; CHECKA-NEXT:    mov r19, r25
+; CHECKA-NEXT:    mov r22, r30
+; CHECKA-NEXT:    mov r23, r31
+; CHECKA-NEXT:    ret
+;
+; CHECKB-LABEL: foo06:
+; CHECKB:       ; %bb.0:
+; CHECKB-NEXT:    movw r30, r20
+; CHECKB-NEXT:    movw r20, r22
+; CHECKB-NEXT:    movw r18, r24
+; CHECKB-NEXT:    movw r22, r30
+; CHECKB-NEXT:    ret
+  %4 = insertvalue %struct.s06 undef, i16 %0, 0
+  %5 = insertvalue %struct.s06 %4, i16 %1, 1
+  %6 = insertvalue %struct.s06 %5, i16 %2, 2
+  ret %struct.s06 %6
+}
+
+define %struct.s04 @foo04(i16 %0, i16 %1) addrspace(1) {
+; CHECKA-LABEL: foo04:
+; CHECKA:       ; %bb.0:
+; CHECKA-NEXT:    mov r18, r22
+; CHECKA-NEXT:    mov r19, r23
+; CHECKA-NEXT:    mov r22, r24
+; CHECKA-NEXT:    mov r23, r25
+; CHECKA-NEXT:    mov r24, r18
+; CHECKA-NEXT:    mov r25, r19
+; CHECKA-NEXT:    ret
+;
+; CHECKB-LABEL: foo04:
+; CHECKB:       ; %bb.0:
+; CHECKB-NEXT:    movw r18, r22
+; CHECKB-NEXT:    movw r22, r24
+; CHECKB-NEXT:    movw r24, r18
+; CHECKB-NEXT:    ret
+  %3 = insertvalue %struct.s04 undef, i16 %0, 0
+  %4 = insertvalue %struct.s04 %3, i16 %1, 1
+  ret %struct.s04 %4
+}