xref: /aosp_15_r20/external/llvm/test/CodeGen/MIR/X86/jump-table-info.mir (revision 9880d6810fe72a1726cb53787c6711e909410d58)

# RUN: llc -march=x86-64 -start-after branch-folder -stop-after branch-folder -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.lbl1', '%bb.4.lbl2', '%bb.5.lbl3', '%bb.6.lbl4' ]
# CHECK-NEXT: body:
jumpTable:
  kind:          label-difference32
  entries:
    - id:        0
      blocks:    [ '%bb.3.lbl1', '%bb.4.lbl2', '%bb.5.lbl3', '%bb.6.lbl4' ]
body: |
  bb.0.entry:
    successors: %bb.2.def, %bb.1.entry

    %eax = MOV32rr %edi, implicit-def %rax
    CMP32ri8 %edi, 3, implicit-def %eflags
    JA_1 %bb.2.def, implicit %eflags

  bb.1.entry:
    successors: %bb.3.lbl1, %bb.4.lbl2, %bb.5.lbl3, %bb.6.lbl4
    ; CHECK: %rcx = LEA64r %rip, 1, _, %jump-table.0, _
    %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
    RETQ %eax

  bb.3.lbl1:
    %eax = MOV32ri 1
    RETQ %eax

  bb.4.lbl2:
    %eax = MOV32ri 2
    RETQ %eax

  bb.5.lbl3:
    %eax = MOV32ri 4
    RETQ %eax

  bb.6.lbl4:
    %eax = MOV32ri 8
    RETQ %eax
...
---
name:            test_jumptable2
jumpTable:
  kind:          label-difference32
  entries:
    - id:        1
      blocks:    [ '%bb.3.lbl1', '%bb.4.lbl2', '%bb.5.lbl3', '%bb.6.lbl4' ]
body: |
  bb.0.entry:
    successors: %bb.2.def, %bb.1.entry

    %eax = MOV32rr %edi, implicit-def %rax
    CMP32ri8 %edi, 3, implicit-def %eflags
    JA_1 %bb.2.def, implicit %eflags

  bb.1.entry:
    successors: %bb.3.lbl1, %bb.4.lbl2, %bb.5.lbl3, %bb.6.lbl4
    ; Verify that the printer will use an id of 0 for this jump table:
    ; CHECK: %rcx = LEA64r %rip, 1, _, %jump-table.0, _
    %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
    RETQ %eax

  bb.3.lbl1:
    %eax = MOV32ri 1
    RETQ %eax

  bb.4.lbl2:
    %eax = MOV32ri 2
    RETQ %eax

  bb.5.lbl3:
    %eax = MOV32ri 4
    RETQ %eax

  bb.6.lbl4:
    %eax = MOV32ri 8
    RETQ %eax
...