# RUN: llc -run-pass arm-cp-islands %s -o - | FileCheck %s
--- |
; ModuleID = '<stdin>'
source_filename = "<stdin>"
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv6m--none-eabi"
declare void @exit0()
declare void @exit1(i32)
declare void @exit2()
declare void @exit3()
declare void @exit4()
define void @jump_table(i32 %val, i32 %arg2, i32 %arg3, i32 %arg4) {
entry:
switch i32 %val, label %default [
i32 1, label %lab1
i32 2, label %lab2
i32 3, label %lab3
i32 4, label %lab4
]
default: ; preds = %entry
tail call void @exit0()
ret void
lab1: ; preds = %entry
%b = sub i32 %val, 1
%a = shl i32 %b, 2
tail call void @exit1(i32 %a)
ret void
lab2: ; preds = %entry
tail call void @exit2()
ret void
lab3: ; preds = %entry
tail call void @exit3()
ret void
lab4: ; preds = %entry
tail call void @exit4()
ret void
}
; Function Attrs: nounwind
declare void @llvm.stackprotector(ptr, ptr) #0
attributes #0 = { nounwind }
...
---
name: jump_table
alignment: 2
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
tracksRegLiveness: true
liveins:
- { reg: '$r0' }
calleeSavedRegisters: [ '$lr', '$d8', '$d9', '$d10', '$d11', '$d12', '$d13',
'$d14', '$d15', '$q4', '$q5', '$q6', '$q7', '$r4',
'$r5', '$r6', '$r7', '$r8', '$r9', '$r10', '$r11',
'$s16', '$s17', '$s18', '$s19', '$s20', '$s21',
'$s22', '$s23', '$s24', '$s25', '$s26', '$s27',
'$s28', '$s29', '$s30', '$s31', '$d8_d10', '$d9_d11',
'$d10_d12', '$d11_d13', '$d12_d14', '$d13_d15',
'$q4_q5', '$q5_q6', '$q6_q7', '$q4_q5_q6_q7', '$r4_r5',
'$r6_r7', '$r8_r9', '$r10_r11', '$d8_d9_d10', '$d9_d10_d11',
'$d10_d11_d12', '$d11_d12_d13', '$d12_d13_d14',
'$d13_d14_d15', '$d8_d10_d12', '$d9_d11_d13', '$d10_d12_d14',
'$d11_d13_d15', '$d8_d10_d12_d14', '$d9_d11_d13_d15',
'$d9_d10', '$d11_d12', '$d13_d14', '$d9_d10_d11_d12',
'$d11_d12_d13_d14' ]
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 8
offsetAdjustment: 0
maxAlignment: 4
adjustsStack: true
hasCalls: true
maxCallFrameSize: 0
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
stack:
- { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, callee-saved-register: '$lr', callee-saved-restored: false }
- { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, callee-saved-register: '$r7' }
jumpTable:
kind: inline
entries:
- id: 0
blocks: [ '%bb.3.lab1', '%bb.4.lab2', '%bb.5.lab3', '%bb.6.lab4' ]
# r1 is redefined in the middle of the recognizable jump sequence - it shouldn't be clobbered!
# CHECK-NOT: tTBB_JT
body: |
bb.0.entry:
successors: %bb.2.default(0x19999998), %bb.1.entry(0x66666668)
liveins: $r0, $r7, $lr
frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
frame-setup CFI_INSTRUCTION def_cfa_offset 8
frame-setup CFI_INSTRUCTION offset $lr, -4
frame-setup CFI_INSTRUCTION offset $r7, -8
$r1, dead $cpsr = tSUBi3 $r0, 1, 14, $noreg
tCMPi8 $r1, 3, 14, $noreg, implicit-def $cpsr
tBcc %bb.2.default, 8, killed $cpsr
bb.1.entry:
successors: %bb.3.lab1(0x20000000), %bb.4.lab2(0x20000000), %bb.5.lab3(0x20000000), %bb.6.lab4(0x20000000)
liveins: $r0, $r1
$r1, dead $cpsr = tLSLri killed $r1, 2, 14, $noreg
$r2 = tLEApcrelJT %jump-table.0, 14, $noreg
$r2 = tLDRr killed $r1, killed $r2, 14, $noreg :: (load (s32) from jump-table)
$r1, dead $cpsr = tLSLri $r2, 2, 14, $noreg
tBR_JTr killed $r2, %jump-table.0
bb.2.default:
tBL 14, $noreg, @exit0, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
tPOP_RET 14, $noreg, def $r7, def $pc, implicit-def $sp, implicit $sp
bb.3.lab1:
liveins: $r0,$r1
tBL 14, $noreg, @exit1, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit $r0, implicit-def $sp
tPOP_RET 14, $noreg, def $r7, def $pc, implicit-def $sp, implicit $sp
bb.4.lab2:
tBL 14, $noreg, @exit2, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
tPOP_RET 14, $noreg, def $r7, def $pc, implicit-def $sp, implicit $sp
bb.5.lab3:
tBL 14, $noreg, @exit3, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
tPOP_RET 14, $noreg, def $r7, def $pc, implicit-def $sp, implicit $sp
bb.6.lab4:
tBL 14, $noreg, @exit4, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
tPOP_RET 14, $noreg, def $r7, def $pc, implicit-def $sp, implicit $sp
...
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