| # 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 |
| |
| ... |
