# REQUIRES: asserts
#
# RUN: llc -mtriple=thumbv6m -start-before=machine-cp -debug -o - %s 2>%t | \
# RUN:     FileCheck %s --check-prefix=OUTPUT
# RUN: FileCheck %s --check-prefix=DEBUG < %t
#
# DEBUG: Estimated function size for f = 4 bytes
#
# OUTPUT:  mov r0, r1
# OUTPUT:  bx lr

--- |
  target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
  target triple = "thumbv6m-unknown-none-eabi"

  define i32 @f(i32 %x, i32 %y) {
  entry:
    ret i32 %y
  }
 
...
---
name:            f
tracksRegLiveness: true
frameInfo:
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  localFrameSize:  0
machineFunctionInfo:
  isLRSpilled:     false
body:             |
  bb.0.entry:
    liveins: $r1
  
    renamable $r0 = COPY $r1
    tBX_RET 14 /* CC::al */, $noreg, implicit $r0
...