File: select-returnaddr.ll

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llvm-toolchain-11 1%3A11.0.1-2
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; RUN: llc -mtriple=arm64-apple-ios -global-isel -o - %s | FileCheck %s

define i8* @rt0(i32 %x) nounwind readnone {
entry:
; CHECK-LABEL: rt0:
; CHECK-NOT: stp
; CHECK: mov x0, x30
  %0 = tail call i8* @llvm.returnaddress(i32 0)
  ret i8* %0
}

define i8* @rt0_call_clobber(i32 %x) nounwind readnone {
entry:
; CHECK-LABEL: rt0_call_clobber:
; CHECK: stp     x20, x19, [sp, #-32]!
; CHECK: stp     x29, x30, [sp, #16]
; CHECK: mov     x19, x30
; CHECK: bl      _foo
; CHECK: ldp     x29, x30, [sp, #16]
; CHECK: mov     x0, x19
  %ret = call i32 @foo()
  %0 = tail call i8* @llvm.returnaddress(i32 0)
  ret i8* %0
}

define i8* @rt2() nounwind readnone {
entry:
; CHECK-LABEL: rt2:
; CHECK: ldr x[[reg:[0-9]+]], [x29]
; CHECK: ldr x[[reg]], [x[[reg]]]
; CHECK: ldr x0, [x[[reg]], #8]
  %0 = tail call i8* @llvm.returnaddress(i32 2)
  ret i8* %0
}


declare i32 @foo()
declare i8* @llvm.returnaddress(i32) nounwind readnone