# RUN: llc -run-pass=tailduplication -tail-dup-size=4 %s -o - | FileCheck %s
# JumpTableDest32 uses an `adr` to a temporary label (itself). If duplicated we
# cannot guarantee reachability for any uses after the first.
# CHECK: JumpTableDest32
# CHECK-NOT: JumpTableDest32
--- |
; ModuleID = 'jump-table.ll'
source_filename = "jump-table.ll"
target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
target triple = "arm64-apple-ios"
define i32 @test_jumptable32(i32 %in, i1 %tst) {
br i1 %tst, label %true, label %false
true: ; preds = %0
call void @foo()
br label %switch
false: ; preds = %0
call void @bar()
br label %switch
lbl1: ; preds = %lbl4, %lbl3, %def, %switch
%merge = phi i32 [ 1, %switch ], [ 0, %def ], [ 4, %lbl3 ], [ 8, %lbl4 ]
ret i32 %merge
switch: ; preds = %false, %true
switch i32 %in, label %def [
i32 0, label %lbl1
i32 1, label %lbl2
i32 2, label %lbl3
i32 4, label %lbl4
]
def: ; preds = %switch
br label %lbl1
lbl2: ; preds = %switch
%1 = call i64 @llvm.aarch64.space(i32 262144, i64 undef)
ret i32 2
lbl3: ; preds = %switch
br label %lbl1
lbl4: ; preds = %switch
br label %lbl1
}
declare void @foo()
declare void @bar()
; Function Attrs: nounwind
declare i64 @llvm.aarch64.space(i32, i64) #0
attributes #0 = { nounwind }
...
---
name: test_jumptable32
alignment: 4
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
failedISel: false
tracksRegLiveness: true
hasWinCFI: false
registers: []
liveins:
- { reg: '$w0', virtual-reg: '' }
- { reg: '$w1', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 32
offsetAdjustment: 0
maxAlignment: 8
adjustsStack: true
hasCalls: true
stackProtector: ''
maxCallFrameSize: 0
cvBytesOfCalleeSavedRegisters: 0
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
localFrameSize: 0
savePoint: ''
restorePoint: ''
fixedStack: []
stack:
- { id: 0, name: '', type: spill-slot, offset: -8, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 1, name: '', type: spill-slot, offset: -16, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$fp', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 2, name: '', type: spill-slot, offset: -24, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x19', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 3, name: '', type: spill-slot, offset: -32, size: 8, alignment: 8,
stack-id: default, callee-saved-register: '$x20', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites: []
constants: []
machineFunctionInfo:
hasRedZone: false
jumpTable:
kind: label-difference32
entries:
- id: 0
blocks: [ '%bb.9', '%bb.6', '%bb.7', '%bb.5', '%bb.8' ]
body: |
bb.0 (%ir-block.0):
successors: %bb.1(0x40000000), %bb.2(0x40000000)
liveins: $w0, $w1, $x19, $x20, $lr
early-clobber $sp = frame-setup STPXpre killed $x20, killed $x19, $sp, -4 :: (store (s64) into %stack.3), (store (s64) into %stack.2)
frame-setup STPXi killed $fp, killed $lr, $sp, 2 :: (store (s64) into %stack.1), (store (s64) into %stack.0)
frame-setup CFI_INSTRUCTION def_cfa_offset 32
frame-setup CFI_INSTRUCTION offset $w30, -8
frame-setup CFI_INSTRUCTION offset $w29, -16
frame-setup CFI_INSTRUCTION offset $w19, -24
frame-setup CFI_INSTRUCTION offset $w20, -32
renamable $w19 = COPY $w0
TBZW killed renamable $w1, 0, %bb.2
bb.1.true:
successors: %bb.3(0x80000000)
liveins: $w19
BL @foo, csr_darwin_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
B %bb.3
bb.2.false:
successors: %bb.3(0x80000000)
liveins: $w19
BL @bar, csr_darwin_aarch64_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp
B %bb.3
bb.3.switch:
successors: %bb.9(0x1c71c71c), %bb.6(0x1c71c71c), %bb.7(0x1c71c71c), %bb.5(0x0e38e38e), %bb.8(0x1c71c71c)
liveins: $w19
renamable $w8 = ORRWrs $wzr, killed renamable $w19, 0, implicit-def $x8
renamable $x9 = MOVaddrJT target-flags(aarch64-page) %jump-table.0, target-flags(aarch64-pageoff, aarch64-nc) %jump-table.0
early-clobber renamable $x10, dead early-clobber renamable $x11 = JumpTableDest32 killed renamable $x9, killed renamable $x8, %jump-table.0
BR killed renamable $x10
bb.5.def:
successors: %bb.9(0x80000000)
renamable $w0 = COPY $wzr
B %bb.9
bb.6.lbl2:
successors: %bb.9(0x80000000)
dead $xzr = SPACE 262144, undef renamable $x8
$w0 = MOVi32imm 2
B %bb.9
bb.7.lbl3:
successors: %bb.9(0x80000000)
renamable $w0 = MOVi32imm 4
B %bb.9
bb.8.lbl4:
successors: %bb.9(0x80000000)
renamable $w0 = MOVi32imm 8
bb.9.lbl1:
liveins: $w0
$fp, $lr = frame-destroy LDPXi $sp, 2 :: (load (s64) from %stack.1), (load (s64) from %stack.0)
early-clobber $sp, $x20, $x19 = frame-destroy LDPXpost $sp, 4 :: (load (s64) from %stack.3), (load (s64) from %stack.2)
RET_ReallyLR implicit $w0
...
Codebase Browser
llvm