test/CodeGen/AArch64/machine-outliner-noreturn-no-stack.mir

# RUN: llc -mtriple=arm64-apple-ios -run-pass=prologepilog -run-pass=machine-outliner -verify-machineinstrs  %s -o - | FileCheck %s

# Noreturn functions conservatively need to save and restore lr.
# When there is no available register, the stack is used at call site.
# If the stack also needs to be set up for a call in the outlined function,
# bail-out this case since we do not handle adjusting the stack twice.

# CHECK-NOT: OUTLINED_FUNCTION

--- |
  @g = external global i32
  define void @stack_1() #0 { ret void }
  define void @stack_2() #0 { ret void }
  define void @baz() { ret void }
  attributes #0 = { noredzone noreturn }
...
---
name:            stack_1
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x4, $x0, $x1, $x2, $x3
    $w8 = MOVZWi 259, 0
    $x9 = ADRP target-flags(aarch64-page) @g
    $x9 = ADDXri $x9, target-flags(aarch64-pageoff, aarch64-nc) @g, 0
    STRXui  $x9, $x1, 0
    STRHHui $w8, $x1, 8
    $w8 = ORRWrs $wzr, $w4, 0, implicit-def $x8
    STRXui $x8, $x3, 0
    STPXi $x3, $xzr, $x2, 0
    $w8 = MOVZWi 271, 0
    STRHHui $w8, $x2, 8
    $x8 = ORRXrs $xzr, $x0, 0
    $x0 = ORRXrs $xzr, $x1, 0
    $x1 = ORRXrs $xzr, $x2, 0
    BL @baz, implicit-def dead $lr, implicit $sp, implicit $x8, implicit $x0, implicit $x1, implicit $x3, implicit $x4, implicit-def $sp, implicit-def $x5, implicit-def $x6, implicit-def $x7, implicit-def $x8,  implicit-def $x9, implicit-def $x10,  implicit-def $x11, implicit-def $x12, implicit-def $x13,  implicit-def $x14, implicit-def $x15, implicit-def $x18
    BRK 1
...
---
name:            stack_2
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $x4, $x0, $x1, $x2, $x3
    $w8 = MOVZWi 259, 0
    $x9 = ADRP target-flags(aarch64-page) @g
    $x9 = ADDXri $x9, target-flags(aarch64-pageoff, aarch64-nc) @g, 0
    STRXui $x9, $x1, 0
    STRHHui $w8, $x1, 8
    $w8 = ORRWrs $wzr, $w4, 0, implicit-def $x8
    STRXui $x8, $x3, 0
    STPXi $x3, $xzr, $x2, 0
    $w8 = MOVZWi 271, 0
    STRHHui $w8, $x2, 8
    $x8 = ORRXrs $xzr, $x0, 0
    $x0 = ORRXrs $xzr, $x1, 0
    $x1 = ORRXrs $xzr, $x2, 0
    BL @baz, implicit-def dead $lr, implicit $sp, implicit $x8, implicit $x0, implicit $x1, implicit $x3, implicit $x4, implicit-def $sp, implicit-def $x5, implicit-def $x6, implicit-def $x7, implicit-def $x8,  implicit-def $x9, implicit-def $x10,  implicit-def $x11, implicit-def $x12, implicit-def $x13,  implicit-def $x14, implicit-def $x15, implicit-def $x18
    BRK 1
...
---
name:            baz
tracksRegLiveness: true
body:             |
  bb.0:
    liveins: $w0, $lr, $w8
    RET undef $lr