1 # RUN: llc -mtriple=thumbv8.1m.main %s -run-pass=arm-low-overhead-loops --verify-machineinstrs -o - | FileCheck %s
5 # CHECK-NOT: t2LEUpdate
8 define i32 @skip_spill(i32 %n) #0 {
10 %cmp6 = icmp eq i32 %n, 0
11 br i1 %cmp6, label %while.end, label %while.body.preheader
13 while.body.preheader: ; preds = %entry
14 call void @llvm.set.loop.iterations.i32(i32 %n)
17 while.body: ; preds = %while.body, %while.body.preheader
18 %res.07 = phi i32 [ %add, %while.body ], [ 0, %while.body.preheader ]
19 %0 = phi i32 [ %n, %while.body.preheader ], [ %1, %while.body ]
20 %call = tail call i32 bitcast (i32 (...)* @bar to i32 ()*)()
21 %add = add nsw i32 %call, %res.07
22 %1 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)
23 %2 = icmp ne i32 %1, 0
24 br i1 %2, label %while.body, label %while.end
26 while.end: ; preds = %while.body, %entry
27 %res.0.lcssa = phi i32 [ 0, %entry ], [ %add, %while.body ]
31 declare i32 @bar(...) local_unnamed_addr #0
33 ; Function Attrs: noduplicate nounwind
34 declare void @llvm.set.loop.iterations.i32(i32) #1
36 ; Function Attrs: noduplicate nounwind
37 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #1
39 ; Function Attrs: nounwind
40 declare void @llvm.stackprotector(i8*, i8**) #2
42 attributes #0 = { "target-features"="+mve.fp" }
43 attributes #1 = { noduplicate nounwind }
44 attributes #2 = { nounwind }
50 exposesReturnsTwice: false
52 regBankSelected: false
55 tracksRegLiveness: false
59 - { reg: '$r0', virtual-reg: '' }
61 isFrameAddressTaken: false
62 isReturnAddressTaken: false
72 cvBytesOfCalleeSavedRegisters: 0
73 hasOpaqueSPAdjustment: false
75 hasMustTailInVarArgFunc: false
81 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
82 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
83 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
84 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
85 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
86 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
87 - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
88 stack-id: default, callee-saved-register: '$r5', callee-saved-restored: true,
89 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
90 - { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
91 stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
92 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
95 machineFunctionInfo: {}
98 successors: %bb.4(0x30000000), %bb.1(0x50000000)
100 frame-setup tPUSH 14, $noreg, killed $r4, killed $r5, killed $r7, killed $lr, implicit-def $sp, implicit $sp
101 frame-setup CFI_INSTRUCTION def_cfa_offset 16
102 frame-setup CFI_INSTRUCTION offset $lr, -4
103 frame-setup CFI_INSTRUCTION offset $r7, -8
104 frame-setup CFI_INSTRUCTION offset $r5, -12
105 frame-setup CFI_INSTRUCTION offset $r4, -16
108 bb.1.while.body.preheader:
109 successors: %bb.2(0x80000000)
111 $lr = tMOVr $r0, 14, $noreg
112 renamable $r4, dead $cpsr = tMOVi8 0, 14, $noreg
113 t2DoLoopStart killed $r0
116 successors: %bb.2(0x7c000000), %bb.3(0x04000000)
118 $r5 = tMOVr killed $lr, 14, $noreg
119 tBL 14, $noreg, @bar, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0
120 $lr = tMOVr killed $r5, 14, $noreg
121 renamable $r4 = nsw tADDhirr killed renamable $r4, killed renamable $r0, 14, $noreg
122 renamable $lr = t2LoopDec killed renamable $lr, 1
123 t2LoopEnd renamable $lr, %bb.2, implicit-def dead $cpsr
127 $r0 = tMOVr killed $r4, 14, $noreg
128 tPOP_RET 14, $noreg, def $r4, def $r5, def $r7, def $pc, implicit killed $r0
131 renamable $r4, dead $cpsr = tMOVi8 0, 14, $noreg
132 $r0 = tMOVr killed $r4, 14, $noreg
133 tPOP_RET 14, $noreg, def $r4, def $r5, def $r7, def $pc, implicit killed $r0