1 # RUN: llc -mtriple=thumbv8.1m.main -run-pass=arm-low-overhead-loops %s -verify-machineinstrs -o - | FileCheck %s
2 # CHECK-NOT: $lr = tMOVr $r0, 13
3 # CHECK: $lr = t2DLS killed $r0
4 # CHECK: $lr = t2LEUpdate renamable $lr, %bb.1
7 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
8 target triple = "thumbv8.1m.main"
10 define i32 @do_copy(i32 %n, i32* nocapture %p, i32* nocapture readonly %q) {
12 %scevgep = getelementptr i32, i32* %q, i32 -1
13 %scevgep3 = getelementptr i32, i32* %p, i32 -1
14 call void @llvm.set.loop.iterations.i32(i32 %n)
17 while.body: ; preds = %while.body, %entry
18 %lsr.iv4 = phi i32* [ %scevgep5, %while.body ], [ %scevgep3, %entry ]
19 %lsr.iv = phi i32* [ %scevgep1, %while.body ], [ %scevgep, %entry ]
20 %0 = phi i32 [ %n, %entry ], [ %2, %while.body ]
21 %scevgep6 = getelementptr i32, i32* %lsr.iv, i32 1
22 %scevgep2 = getelementptr i32, i32* %lsr.iv4, i32 1
23 %1 = load i32, i32* %scevgep6, align 4
24 store i32 %1, i32* %scevgep2, align 4
25 %scevgep1 = getelementptr i32, i32* %lsr.iv, i32 1
26 %scevgep5 = getelementptr i32, i32* %lsr.iv4, i32 1
27 %2 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)
28 %3 = icmp ne i32 %2, 0
29 br i1 %3, label %while.body, label %while.end
31 while.end: ; preds = %while.body
35 declare void @llvm.set.loop.iterations.i32(i32) #0
36 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #0
38 attributes #0 = { noduplicate nounwind }
39 attributes #1 = { nounwind }
45 exposesReturnsTwice: false
47 regBankSelected: false
50 tracksRegLiveness: true
54 - { reg: '$r0', virtual-reg: '' }
55 - { reg: '$r1', virtual-reg: '' }
56 - { reg: '$r2', virtual-reg: '' }
58 isFrameAddressTaken: false
59 isReturnAddressTaken: false
69 cvBytesOfCalleeSavedRegisters: 0
70 hasOpaqueSPAdjustment: false
72 hasMustTailInVarArgFunc: false
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: '' }
86 machineFunctionInfo: {}
89 successors: %bb.1(0x80000000)
90 liveins: $r0, $r1, $r2, $r7, $lr
92 frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
93 frame-setup CFI_INSTRUCTION def_cfa_offset 8
94 frame-setup CFI_INSTRUCTION offset $lr, -4
95 frame-setup CFI_INSTRUCTION offset $r7, -8
96 $lr = tMOVr $r0, 14, $noreg
97 t2DoLoopStart killed $r0
98 renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 4, 14, $noreg
99 renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14, $noreg
102 successors: %bb.1(0x7c000000), %bb.2(0x04000000)
103 liveins: $lr, $r0, $r1
105 renamable $r2, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14, $noreg :: (load 4 from %ir.scevgep6)
106 early-clobber renamable $r0 = t2STR_PRE killed renamable $r2, killed renamable $r0, 4, 14, $noreg :: (store 4 into %ir.scevgep2)
107 renamable $lr = t2LoopDec killed renamable $lr, 1
108 t2LoopEnd renamable $lr, %bb.1, implicit-def dead $cpsr
112 $r0, dead $cpsr = tMOVi8 0, 14, $noreg
113 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0