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1# RUN: llc -mtriple=thumbv8.1m.main %s -run-pass=arm-low-overhead-loops --verify-machineinstrs -o - | FileCheck %s2 3# CHECK: while.body:4# CHECK-NOT: t2DLS5# CHECK-NOT: t2LEUpdate6 7--- |8 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"9 target triple = "thumbv8.1m.main"10 11 define i32 @skip_spill(i32 %n) #0 {12 entry:13 %cmp6 = icmp eq i32 %n, 014 br i1 %cmp6, label %while.end, label %while.body.preheader15 16 while.body.preheader: ; preds = %entry17 %start = call i32 @llvm.start.loop.iterations.i32(i32 %n)18 br label %while.body19 20 while.body: ; preds = %while.body, %while.body.preheader21 %res.07 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]22 %0 = phi i32 [ %start, %while.body.preheader ], [ %1, %while.body ]23 %call = tail call i32 @bar()24 %add = add nsw i32 %call, %res.0725 %1 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)26 %2 = icmp ne i32 %1, 027 br i1 %2, label %while.body, label %while.end28 29 while.end: ; preds = %while.body, %entry30 %res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.body ]31 ret i32 %res.0.lcssa32 }33 34 declare i32 @bar(...) local_unnamed_addr #035 36 declare i32 @llvm.start.loop.iterations.i32(i32) #137 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #138 39 attributes #0 = { "target-features"="+mve.fp" }40 attributes #1 = { noduplicate nounwind }41 attributes #2 = { nounwind }42 43...44---45name: skip_spill46alignment: 247exposesReturnsTwice: false48legalized: false49regBankSelected: false50selected: false51failedISel: false52tracksRegLiveness: true53hasWinCFI: false54registers: []55liveins:56 - { reg: '$r0', virtual-reg: '' }57frameInfo:58 isFrameAddressTaken: false59 isReturnAddressTaken: false60 hasStackMap: false61 hasPatchPoint: false62 stackSize: 1663 offsetAdjustment: 064 maxAlignment: 465 adjustsStack: true66 hasCalls: true67 stackProtector: ''68 maxCallFrameSize: 069 cvBytesOfCalleeSavedRegisters: 070 hasOpaqueSPAdjustment: false71 hasVAStart: false72 hasMustTailInVarArgFunc: false73 localFrameSize: 074 savePoint: []75 restorePoint: []76fixedStack: []77stack:78 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4, 79 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false, 80 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }81 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4, 82 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true, 83 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }84 - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4, 85 stack-id: default, callee-saved-register: '$r5', callee-saved-restored: true, 86 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }87 - { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4, 88 stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true, 89 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }90callSites: []91constants: []92machineFunctionInfo: {}93body: |94 bb.0.entry:95 successors: %bb.4(0x30000000), %bb.1(0x50000000)96 liveins: $r0, $r4, $r5, $r7, $lr97 98 frame-setup tPUSH 14, $noreg, killed $r4, killed $r5, killed $r7, killed $lr, implicit-def $sp, implicit $sp99 frame-setup CFI_INSTRUCTION def_cfa_offset 16100 frame-setup CFI_INSTRUCTION offset $lr, -4101 frame-setup CFI_INSTRUCTION offset $r7, -8102 frame-setup CFI_INSTRUCTION offset $r5, -12103 frame-setup CFI_INSTRUCTION offset $r4, -16104 tCBZ $r0, %bb.4105 106 bb.1.while.body.preheader:107 successors: %bb.2(0x80000000)108 liveins: $r0109 110 $lr = tMOVr $r0, 14, $noreg111 renamable $r4, dead $cpsr = tMOVi8 0, 14, $noreg112 $lr = t2DoLoopStart killed $r0113 114 bb.2.while.body:115 successors: %bb.2(0x7c000000), %bb.3(0x04000000)116 liveins: $lr, $r4117 118 $r5 = tMOVr killed $lr, 14, $noreg119 tBL 14, $noreg, @bar, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0120 $lr = tMOVr killed $r5, 14, $noreg121 renamable $r4 = nsw tADDhirr killed renamable $r4, killed renamable $r0, 14, $noreg122 renamable $lr = t2LoopDec killed renamable $lr, 1123 t2LoopEnd renamable $lr, %bb.2, implicit-def dead $cpsr124 tB %bb.3, 14, $noreg125 126 bb.3.while.end:127 liveins: $r4128 129 $r0 = tMOVr killed $r4, 14, $noreg130 tPOP_RET 14, $noreg, def $r4, def $r5, def $r7, def $pc, implicit killed $r0131 132 bb.4:133 renamable $r4, dead $cpsr = tMOVi8 0, 14, $noreg134 $r0 = tMOVr killed $r4, 14, $noreg135 tPOP_RET 14, $noreg, def $r4, def $r5, def $r7, def $pc, implicit killed $r0136 137...138