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1# RUN: llc -mtriple=thumbv8.1m.main -run-pass=arm-low-overhead-loops %s --verify-machineinstrs -o - | FileCheck %s2 3# CHECK: name: non_loop4# CHECK: bb.0.entry:5# CHECK: tBcc %bb.2, 36# CHECK: bb.1.not.preheader:7# CHECK: $lr = t2SUBri killed renamable $lr, 0, 148# CHECK: tBcc %bb.4, 09# CHECK: tB %bb.210# CHECK: bb.3.while.body:11# CHECK: t2CMPri renamable $lr, 0, 1412# CHECK: tBcc %bb.3, 113# CHECK: tB %bb.414# CHECK: bb.4.while.end:15 16--- |17 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"18 target triple = "thumbv8.1m.main"19 20 define void @non_loop(ptr nocapture %a, ptr nocapture readonly %b, i32 %N) {21 entry:22 %cmp = icmp ugt i32 %N, 223 br i1 %cmp, label %not.preheader, label %while.body.preheader24 25 not.preheader: ; preds = %entry26 %test = call i1 @llvm.test.set.loop.iterations.i32(i32 %N)27 br i1 %test, label %while.body.preheader, label %while.end28 29 while.body.preheader: ; preds = %not.preheader, %entry30 %scevgep = getelementptr i16, ptr %a, i32 -131 %scevgep3 = getelementptr i16, ptr %b, i32 -132 br label %while.body33 34 while.body: ; preds = %while.body, %while.body.preheader35 %lsr.iv4 = phi ptr [ %scevgep3, %while.body.preheader ], [ %scevgep5, %while.body ]36 %lsr.iv = phi ptr [ %scevgep, %while.body.preheader ], [ %scevgep1, %while.body ]37 %count = phi i32 [ %count.next, %while.body ], [ %N, %while.body.preheader ]38 %scevgep7 = getelementptr i16, ptr %lsr.iv, i32 139 %scevgep4 = getelementptr i16, ptr %lsr.iv4, i32 140 %load = load i16, ptr %scevgep4, align 241 store i16 %load, ptr %scevgep7, align 242 %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)43 %cmp1 = icmp ne i32 %count.next, 044 %scevgep1 = getelementptr i16, ptr %lsr.iv, i32 145 %scevgep5 = getelementptr i16, ptr %lsr.iv4, i32 146 br i1 %cmp1, label %while.body, label %while.end47 48 while.end: ; preds = %while.body, %not.preheader49 ret void50 }51 52 declare i1 @llvm.test.set.loop.iterations.i32(i32) #053 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #054 declare void @llvm.stackprotector(ptr, ptr) #155 56 attributes #0 = { noduplicate nounwind }57 attributes #1 = { nounwind }58 59...60---61name: non_loop62alignment: 263exposesReturnsTwice: false64legalized: false65regBankSelected: false66selected: false67failedISel: false68tracksRegLiveness: true69hasWinCFI: false70registers: []71liveins:72 - { reg: '$r0', virtual-reg: '' }73 - { reg: '$r1', virtual-reg: '' }74 - { reg: '$r2', virtual-reg: '' }75frameInfo:76 isFrameAddressTaken: false77 isReturnAddressTaken: false78 hasStackMap: false79 hasPatchPoint: false80 stackSize: 881 offsetAdjustment: 082 maxAlignment: 483 adjustsStack: false84 hasCalls: false85 stackProtector: ''86 maxCallFrameSize: 087 cvBytesOfCalleeSavedRegisters: 088 hasOpaqueSPAdjustment: false89 hasVAStart: false90 hasMustTailInVarArgFunc: false91 localFrameSize: 092 savePoint: []93 restorePoint: []94fixedStack: []95stack:96 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4, 97 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false, 98 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }99 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4, 100 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true, 101 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }102callSites: []103constants: []104machineFunctionInfo: {}105body: |106 bb.0.entry:107 successors: %bb.1(0x40000000), %bb.2(0x40000000)108 liveins: $r0, $r1, $r2, $r7, $lr109 110 frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp111 frame-setup CFI_INSTRUCTION def_cfa_offset 8112 frame-setup CFI_INSTRUCTION offset $lr, -4113 frame-setup CFI_INSTRUCTION offset $r7, -8114 $lr = tMOVr $r2, 14, $noreg115 tCMPi8 killed $r2, 3, 14, $noreg, implicit-def $cpsr116 tBcc %bb.2, 3, killed $cpsr117 118 bb.1.not.preheader:119 successors: %bb.2(0x40000000), %bb.4(0x40000000)120 liveins: $lr, $r0, $r1121 122 $lr = t2WhileLoopStartLR killed renamable $lr, %bb.4, implicit-def dead $cpsr123 tB %bb.2, 14, $noreg124 125 bb.2.while.body.preheader:126 successors: %bb.3(0x80000000)127 liveins: $lr, $r0, $r1128 129 renamable $r1, dead $cpsr = tSUBi8 killed renamable $r1, 2, 14, $noreg130 renamable $r0, dead $cpsr = tSUBi8 killed renamable $r0, 2, 14, $noreg131 132 bb.3.while.body:133 successors: %bb.3(0x7c000000), %bb.4(0x04000000)134 liveins: $lr, $r0, $r1135 136 renamable $r2, renamable $r1 = t2LDRH_PRE killed renamable $r1, 2, 14, $noreg :: (load (s16) from %ir.scevgep4)137 early-clobber renamable $r0 = t2STRH_PRE killed renamable $r2, killed renamable $r0, 2, 14, $noreg :: (store (s16) into %ir.scevgep7)138 renamable $lr = t2LoopDec killed renamable $lr, 1139 t2LoopEnd renamable $lr, %bb.3, implicit-def dead $cpsr140 tB %bb.4, 14, $noreg141 142 bb.4.while.end:143 tPOP_RET 14, $noreg, def $r7, def $pc144 145...146