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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 @mov_between_dec_end(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 %0 = phi i32 [ %start, %while.body.preheader ], [ %1, %while.body ]22 %1 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)23 %add = add i32 %1, 224 %2 = icmp ne i32 %1, 025 br i1 %2, label %while.body, label %while.end26 27 while.end: ; preds = %while.body, %entry28 %res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.body ]29 ret i32 %res.0.lcssa30 }31 32 ; Function Attrs: noduplicate nounwind33 declare i32 @llvm.start.loop.iterations.i32(i32) #134 35 ; Function Attrs: noduplicate nounwind36 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #137 38 ; Function Attrs: nounwind39 declare void @llvm.stackprotector(ptr, ptr) #240 41 attributes #0 = { "target-features"="+mve.fp" }42 attributes #1 = { noduplicate nounwind }43 attributes #2 = { nounwind }44 45...46---47name: mov_between_dec_end48alignment: 249exposesReturnsTwice: false50legalized: false51regBankSelected: false52selected: false53failedISel: false54tracksRegLiveness: true55hasWinCFI: false56registers: []57liveins:58 - { reg: '$r0', virtual-reg: '' }59frameInfo:60 isFrameAddressTaken: false61 isReturnAddressTaken: false62 hasStackMap: false63 hasPatchPoint: false64 stackSize: 865 offsetAdjustment: 066 maxAlignment: 467 adjustsStack: false68 hasCalls: false69 stackProtector: ''70 maxCallFrameSize: 071 cvBytesOfCalleeSavedRegisters: 072 hasOpaqueSPAdjustment: false73 hasVAStart: false74 hasMustTailInVarArgFunc: false75 localFrameSize: 076 savePoint: []77 restorePoint: []78fixedStack: []79stack:80 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4, 81 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false, 82 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }83 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4, 84 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true, 85 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }86callSites: []87constants: []88machineFunctionInfo: {}89body: |90 bb.0.entry:91 successors: %bb.4(0x30000000), %bb.1(0x50000000)92 liveins: $r0, $r7, $lr93 94 frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp95 frame-setup CFI_INSTRUCTION def_cfa_offset 896 frame-setup CFI_INSTRUCTION offset $lr, -497 frame-setup CFI_INSTRUCTION offset $r7, -898 tCBZ $r0, %bb.499 100 bb.1.while.body.preheader:101 successors: %bb.2(0x80000000)102 liveins: $r0103 104 $lr = tMOVr $r0, 14, $noreg105 $lr = t2DoLoopStart killed $r0106 107 bb.2.while.body:108 successors: %bb.2(0x7c000000), %bb.3(0x04000000)109 liveins: $lr110 111 $r4 = tMOVr $lr, 14, $noreg112 renamable $lr = t2LoopDec killed renamable $lr, 1113 renamable $r0 = t2ADDri renamable $lr, 2, 14, $noreg, $noreg114 $lr = tMOVr $r4, 14, $noreg115 t2LoopEnd renamable $lr, %bb.2, implicit-def dead $cpsr116 tB %bb.3, 14, $noreg117 118 bb.3.while.end:119 liveins: $r0120 121 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0122 123 bb.4:124 renamable $r0, dead $cpsr = tMOVi8 0, 14, $noreg125 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0126 127...128