test/CodeGen/AMDGPU/GlobalISel/legalize-jump-table.mir

# RUN: not --crash llc -march=amdgcn -run-pass=legalizer -o /dev/null %s 2>&1  | FileCheck %s

# CHECK: LLVM ERROR: unable to legalize instruction: %3:_(p0) = G_JUMP_TABLE %jump-table.0 (in function: jt_test)

# FIXME: This could probably be smaller, but the jump table MIR parsing is very crashy.

--- |
  define i32 @jt_test(i32 %x) {
  entry:
    switch i32 %x, label %return [
      i32 75, label %sw.bb
      i32 34, label %sw.bb
      i32 56, label %sw.bb
      i32 35, label %sw.bb
      i32 40, label %sw.bb
      i32 4, label %sw.bb1
      i32 5, label %sw.bb1
      i32 6, label %sw.bb1
    ]

  sw.bb:                                            ; preds = %entry, %entry, %entry, %entry, %entry
    %add = add nsw i32 %x, 42
    br label %return

  sw.bb1:                                           ; preds = %entry, %entry, %entry
    %mul = mul nsw i32 %x, 3
    br label %return

  return:                                           ; preds = %sw.bb1, %sw.bb, %entry
    %retval.0 = phi i32 [ %mul, %sw.bb1 ], [ %add, %sw.bb ], [ 0, %entry ]
    ret i32 %retval.0
  }

...
---
name:            jt_test
tracksRegLiveness: true
jumpTable:
  kind:            block-address
  entries:
    - id:              0
      blocks:          [ '%bb.3', '%bb.3', '%bb.3', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.2', '%bb.2', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.2', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.2', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4',
                         '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.4', '%bb.2' ]
body:             |
  bb.0.entry:
    liveins: $sgpr0

    %0:_(s32) = COPY $sgpr0
    %1:_(s32) = G_CONSTANT i32 0
    %2:_(s1) = G_ICMP intpred(ugt), %0, %1
    %3:_(p0) = G_JUMP_TABLE %jump-table.0
    S_NOP 0, implicit %3
    G_BRCOND %2, %bb.4

  bb.1.entry:
    successors: %bb.3(0x2aaaaaab), %bb.4(0x2aaaaaab), %bb.2(0x2aaaaaab)

    G_BR %bb.4

  bb.2.sw.bb:
    G_BR %bb.4

  bb.3.sw.bb1:

  bb.4.return:
    S_ENDPGM 0

...