TheRock/compiler/amd-llvm/llvm/test/CodeGen/Thumb2/tbb-removeadd.mir

#RUN: llc -run-pass arm-cp-islands %s -o - | FileCheck %s

--- |
  ; ModuleID = 'test.ll'
  source_filename = "test.c"
  target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
  target triple = "thumbv8r-arm-none-eabi"
  
  define void @Func(i32 %i, ptr nocapture %p) local_unnamed_addr {
  entry:
    switch i32 %i, label %sw.epilog [
      i32 0, label %sw.bb
      i32 1, label %sw.bb1
      i32 2, label %sw.epilog.sink.split
      i32 4, label %sw.bb3
    ]
  
  sw.bb:                                            ; preds = %entry
    br label %sw.epilog.sink.split
  
  sw.bb1:                                           ; preds = %entry
    store i32 0, ptr %p, align 4
    br label %sw.epilog.sink.split
  
  sw.bb3:                                           ; preds = %entry
    br label %sw.epilog.sink.split
  
  sw.epilog.sink.split:                             ; preds = %sw.bb3, %sw.bb1, %sw.bb, %entry
    %.sink = phi i32 [ 2, %sw.bb3 ], [ 0, %sw.bb ], [ 1, %entry ], [ 1, %sw.bb1 ]
    store i32 %.sink, ptr %p, align 4
    br label %sw.epilog
  
  sw.epilog:                                        ; preds = %sw.epilog.sink.split, %entry
    ret void
  }

...
---
name:            Func
alignment:       2
exposesReturnsTwice: false
legalized:       false
regBankSelected: false
selected:        false
tracksRegLiveness: true
liveins:         
  - { reg: '$r0' }
  - { reg: '$r1' }
frameInfo:       
  isFrameAddressTaken: false
  isReturnAddressTaken: false
  hasStackMap:     false
  hasPatchPoint:   false
  stackSize:       0
  offsetAdjustment: 0
  maxAlignment:    0
  adjustsStack:    false
  hasCalls:        false
  maxCallFrameSize: 0
  hasOpaqueSPAdjustment: false
  hasVAStart:      false
  hasMustTailInVarArgFunc: false
jumpTable:       
  kind:            inline
  entries:         
    - id:              0
      blocks:          [ '%bb.2.sw.bb', '%bb.3.sw.bb1', '%bb.5.sw.epilog.sink.split', 
                         '%bb.6.sw.epilog', '%bb.4.sw.bb3' ]
# The ADD should be deleted along with the LEA
# CHECK-NOT: t2LEApcrelJT
# CHECK-NOT: t2ADDrs
# CHECK: tMOVi8
# CHECK: t2TBB_JT

body:             |
  bb.0.entry:
    successors: %bb.6.sw.epilog(0x0ccccccb), %bb.1.entry(0x73333335)
    liveins: $r0, $r1
  
    tCMPi8 $r0, 4, 14, $noreg, implicit-def $cpsr
    t2Bcc %bb.6.sw.epilog, 8, killed $cpsr
  
  bb.1.entry:
    successors: %bb.2.sw.bb(0x1c71c71c), %bb.3.sw.bb1(0x1c71c71c), %bb.5.sw.epilog.sink.split(0x1c71c71c), %bb.6.sw.epilog(0x0e38e38e), %bb.4.sw.bb3(0x1c71c71c)
  liveins: $r0, $r1
  
    $r2 = t2LEApcrelJT %jump-table.0, 14, $noreg
    $r3 = t2ADDrs killed $r2, $r0, 18, 14, $noreg, $noreg
    $r2, dead $cpsr = tMOVi8 1, 14, $noreg
    t2BR_JT killed $r3, killed $r0, %jump-table.0
  
  bb.2.sw.bb:
    successors: %bb.5.sw.epilog.sink.split(0x80000000)
    liveins: $r1
  
    $r2, dead $cpsr = tMOVi8 0, 14, $noreg
    t2B %bb.5.sw.epilog.sink.split, 14, $noreg
  
  bb.3.sw.bb1:
    successors: %bb.5.sw.epilog.sink.split(0x80000000)
    liveins: $r1
  
    $r0, dead $cpsr = tMOVi8 0, 14, $noreg
    $r2, dead $cpsr = tMOVi8 1, 14, $noreg
    tSTRi killed $r0, $r1, 0, 14, $noreg :: (store (s32) into %ir.p)
    t2B %bb.5.sw.epilog.sink.split, 14, $noreg
  
  bb.4.sw.bb3:
    successors: %bb.5.sw.epilog.sink.split(0x80000000)
    liveins: $r1
  
    $r2, dead $cpsr = tMOVi8 2, 14, $noreg
  
  bb.5.sw.epilog.sink.split:
    successors: %bb.6.sw.epilog(0x80000000)
    liveins: $r1, $r2
  
    tSTRi killed $r2, killed $r1, 0, 14, $noreg :: (store (s32) into %ir.p)
  
  bb.6.sw.epilog:
    tBX_RET 14, $noreg

...