File: ret-addr-01.ll

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llvm-toolchain-19 1%3A19.1.7-3
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; Test support for the llvm.returnaddress intrinsic.
; 
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s

; The current function's return address is in the link register.
define ptr @rt0() norecurse nounwind readnone {
entry:
; CHECK-LABEL: rt0:
; CHECK: lgr  %r2, %r14
; CHECK: br   %r14
  %0 = tail call ptr @llvm.returnaddress(i32 0)
  ret ptr %0
}

; Check the caller's return address.
define ptr @rtcaller() nounwind "backchain" {
entry:
; CHECK-LABEL: rtcaller:
; CHECK: lg   %r1, 0(%r15)
; CHECK  lg   %r2, 112(%r1)
; CHECK: br   %r14
  %0 = tail call ptr @llvm.returnaddress(i32 1)
  ret ptr %0
}

; Check the caller's caller's return address.
define ptr @rtcallercaller() nounwind "backchain" {
entry:
; CHECK-LABEL: rtcallercaller:
; CHECK: lg   %r1, 0(%r15)
; CHECK: lg   %r1, 0(%r1)
; CHECK  lg   %r2, 112(%r1)
; CHECK: br   %r14
  %0 = tail call ptr @llvm.returnaddress(i32 2)
  ret ptr %0
}

declare ptr @llvm.returnaddress(i32) nounwind readnone