llvm/test/CodeGen/MIR/X86/jump-table-info.mir

# RUN: llc -march=x86-64 -run-pass none -o - %s | FileCheck %s
# This test ensures that the MIR parser parses the jump table info and jump
# table operands correctly.

--- |

  define i32 @test_jumptable(i32 %in) {
  entry:
    switch i32 %in, label %def [
      i32 0, label %lbl1
      i32 1, label %lbl2
      i32 2, label %lbl3
      i32 3, label %lbl4
    ]

  def:
    ret i32 0

  lbl1:
    ret i32 1

  lbl2:
    ret i32 2

  lbl3:
    ret i32 4

  lbl4:
    ret i32 8
  }

  define i32 @test_jumptable2(i32 %in) {
  entry:
    switch i32 %in, label %def [
      i32 0, label %lbl1
      i32 1, label %lbl2
      i32 2, label %lbl3
      i32 3, label %lbl4
    ]

  def:
    ret i32 0

  lbl1:
    ret i32 1

  lbl2:
    ret i32 2

  lbl3:
    ret i32 4

  lbl4:
    ret i32 8
  }

...
---
name:            test_jumptable
# CHECK:      jumpTable:
# CHECK-NEXT: kind: label-difference32
# CHECK-NEXT: entries:
# CHECK-NEXT: - id: 0
# CHECK-NEXT: blocks: [ '%bb.3', '%bb.4', '%bb.5', '%bb.6' ]
# CHECK-NEXT: body:
jumpTable:
  kind:          label-difference32
  entries:
    - id:        0
      blocks:    [ '%bb.3', '%bb.4', '%bb.5', '%bb.6' ]
body: |
  bb.0.entry:
    successors: %bb.2, %bb.1

    $eax = MOV32rr $edi, implicit-def $rax
    CMP32ri8 $edi, 3, implicit-def $eflags
    JCC_1 %bb.2, 7, implicit $eflags

  bb.1.entry:
    successors: %bb.3, %bb.4, %bb.5, %bb.6
    ; CHECK: $rcx = LEA64r $rip, 1, $noreg, %jump-table.0, $noreg
    $rcx = LEA64r $rip, 1, _, %jump-table.0, _
    $rax = MOVSX64rm32 $rcx, 4, $rax, 0, _
    $rax = ADD64rr $rax, $rcx, implicit-def $eflags
    JMP64r $rax

  bb.2.def:
    $eax = MOV32r0 implicit-def $eflags
    RET64 $eax

  bb.3.lbl1:
    $eax = MOV32ri 1
    RET64 $eax

  bb.4.lbl2:
    $eax = MOV32ri 2
    RET64 $eax

  bb.5.lbl3:
    $eax = MOV32ri 4
    RET64 $eax

  bb.6.lbl4:
    $eax = MOV32ri 8
    RET64 $eax
...
---
name:            test_jumptable2
jumpTable:
  kind:          label-difference32
  entries:
    - id:        1
      blocks:    [ '%bb.3', '%bb.4', '%bb.5', '%bb.6' ]
body: |
  bb.0.entry:
    successors: %bb.2, %bb.1

    $eax = MOV32rr $edi, implicit-def $rax
    CMP32ri8 $edi, 3, implicit-def $eflags
    JCC_1 %bb.2, 7, implicit $eflags

  bb.1.entry:
    successors: %bb.3, %bb.4, %bb.5, %bb.6
    ; Verify that the printer will use an id of 0 for this jump table:
    ; CHECK: $rcx = LEA64r $rip, 1, $noreg, %jump-table.0, $noreg
    $rcx = LEA64r $rip, 1, _, %jump-table.1, _
    $rax = MOVSX64rm32 $rcx, 4, $rax, 0, _
    $rax = ADD64rr $rax, $rcx, implicit-def $eflags
    JMP64r $rax

  bb.2.def:
    $eax = MOV32r0 implicit-def $eflags
    RET64 $eax

  bb.3.lbl1:
    $eax = MOV32ri 1
    RET64 $eax

  bb.4.lbl2:
    $eax = MOV32ri 2
    RET64 $eax

  bb.5.lbl3:
    $eax = MOV32ri 4
    RET64 $eax

  bb.6.lbl4:
    $eax = MOV32ri 8
    RET64 $eax
...