1 # RUN: llc -O0 -run-pass=arm-low-overhead-loops -o - -verify-machineinstrs %s | FileCheck %s
3 # CHECK-NOT: WhileLoopStart
6 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
7 target triple = "thumbv8.1m.main"
9 define void @size_limit(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) #0 {
13 for.cond.cleanup: ; preds = %while, %for.body
16 for.body.preheader: ; preds = %while
17 %scevgep = getelementptr i32, i32* %a, i32 -1
18 %scevgep4 = getelementptr i32, i32* %c, i32 -1
19 %scevgep8 = getelementptr i32, i32* %b, i32 -1
22 for.body: ; preds = %for.body, %for.body.preheader
23 %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
24 %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
25 %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
26 %0 = phi i32 [ %N, %for.body.preheader ], [ %3, %for.body ]
27 %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
28 %1 = load i32, i32* %scevgep11, align 4
29 %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
30 %2 = load i32, i32* %scevgep7, align 4
31 %mul = mul nsw i32 %2, %1
32 %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
33 store i32 %mul, i32* %scevgep3, align 4
34 %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
35 %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
36 %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
37 %3 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)
38 %4 = icmp ne i32 %3, 0
39 br i1 %4, label %for.body, label %for.cond.cleanup
41 while: ; preds = %entry
42 %cmp8 = call i1 @llvm.test.set.loop.iterations.i32(i32 %N)
43 br i1 %cmp8, label %for.body.preheader, label %for.cond.cleanup
46 ; Function Attrs: nounwind
47 declare i32 @llvm.arm.space(i32 immarg, i32) #1
49 ; Function Attrs: noduplicate nounwind
50 declare i1 @llvm.test.set.loop.iterations.i32(i32) #2
52 ; Function Attrs: noduplicate nounwind
53 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #2
55 attributes #0 = { "target-features"="+lob" }
56 attributes #1 = { nounwind }
57 attributes #2 = { noduplicate nounwind }
63 exposesReturnsTwice: false
65 regBankSelected: false
68 tracksRegLiveness: true
72 - { reg: '$r0', virtual-reg: '' }
73 - { reg: '$r1', virtual-reg: '' }
74 - { reg: '$r2', virtual-reg: '' }
75 - { reg: '$r3', virtual-reg: '' }
77 isFrameAddressTaken: false
78 isReturnAddressTaken: false
88 cvBytesOfCalleeSavedRegisters: 0
89 hasOpaqueSPAdjustment: false
91 hasMustTailInVarArgFunc: false
97 - { id: 0, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
98 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
99 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
100 - { id: 1, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
101 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
102 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
103 - { id: 2, name: '', type: spill-slot, offset: -20, size: 4, alignment: 4,
104 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
105 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
106 - { id: 3, name: '', type: spill-slot, offset: -24, size: 4, alignment: 4,
107 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
108 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
109 - { id: 4, name: '', type: spill-slot, offset: -28, size: 4, alignment: 4,
110 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
111 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
112 - { id: 5, name: '', type: spill-slot, offset: -32, size: 4, alignment: 4,
113 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
114 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
115 - { id: 6, name: '', type: spill-slot, offset: -36, size: 4, alignment: 4,
116 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
117 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
118 - { id: 7, name: '', type: spill-slot, offset: -40, size: 4, alignment: 4,
119 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
120 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
121 - { id: 8, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
122 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
123 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
124 - { id: 9, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
125 stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
126 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
129 machineFunctionInfo: {}
132 successors: %bb.4(0x80000000)
133 liveins: $r0, $r1, $r2, $r3, $r4, $lr
135 frame-setup tPUSH 14, $noreg, killed $r4, killed $lr, implicit-def $sp, implicit $sp
136 frame-setup CFI_INSTRUCTION def_cfa_offset 8
137 frame-setup CFI_INSTRUCTION offset $lr, -4
138 frame-setup CFI_INSTRUCTION offset $r4, -8
139 $sp = frame-setup tSUBspi $sp, 8, 14, $noreg
140 frame-setup CFI_INSTRUCTION def_cfa_offset 40
141 tSTRspi killed $r3, $sp, 7, 14, $noreg :: (store 4 into %stack.0)
142 tSTRspi killed $r2, $sp, 6, 14, $noreg :: (store 4 into %stack.1)
143 tSTRspi killed $r1, $sp, 5, 14, $noreg :: (store 4 into %stack.2)
144 tSTRspi killed $r0, $sp, 4, 14, $noreg :: (store 4 into %stack.3)
147 bb.1.for.cond.cleanup:
148 $sp = tADDspi $sp, 8, 14, $noreg
149 tPOP_RET 14, $noreg, def $r4, def $pc
151 bb.2.for.body.preheader:
152 successors: %bb.3(0x80000000)
154 $r0 = tLDRspi $sp, 4, 14, $noreg :: (load 4 from %stack.3)
155 renamable $r1, dead $cpsr = tSUBi3 killed renamable $r0, 4, 14, $noreg
156 $r2 = tLDRspi $sp, 6, 14, $noreg :: (load 4 from %stack.1)
157 renamable $r3, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14, $noreg
158 $r12 = t2LDRi12 $sp, 20, 14, $noreg :: (load 4 from %stack.2)
159 renamable $lr = t2SUBri killed renamable $r12, 4, 14, $noreg, $noreg
160 $r4 = tLDRspi $sp, 7, 14, $noreg :: (load 4 from %stack.0)
161 t2STRi12 killed $lr, $sp, 12, 14, $noreg :: (store 4 into %stack.4)
162 tSTRspi killed $r3, $sp, 2, 14, $noreg :: (store 4 into %stack.5)
163 tSTRspi killed $r1, $sp, 1, 14, $noreg :: (store 4 into %stack.6)
164 tSTRspi killed $r4, $sp, 0, 14, $noreg :: (store 4 into %stack.7)
168 successors: %bb.3(0x40000000), %bb.1(0x40000000)
170 $r0 = tLDRspi $sp, 0, 14, $noreg :: (load 4 from %stack.7)
171 $r1 = tLDRspi $sp, 1, 14, $noreg :: (load 4 from %stack.6)
172 $r2 = tLDRspi $sp, 2, 14, $noreg :: (load 4 from %stack.5)
173 $r3 = tLDRspi $sp, 3, 14, $noreg :: (load 4 from %stack.4)
174 renamable $r12, renamable $r3 = t2LDR_PRE renamable $r3, 4, 14, $noreg :: (load 4 from %ir.scevgep11)
175 renamable $lr, renamable $r2 = t2LDR_PRE renamable $r2, 4, 14, $noreg :: (load 4 from %ir.scevgep7)
176 renamable $r12 = nsw t2MUL killed renamable $lr, killed renamable $r12, 14, $noreg
177 early-clobber renamable $r1 = t2STR_PRE killed renamable $r12, renamable $r1, 4, 14, $noreg :: (store 4 into %ir.scevgep3)
178 $lr = tMOVr killed $r0, 14, $noreg
179 renamable $lr = t2LoopDec killed renamable $lr, 1
180 $r0 = tMOVr $lr, 14, $noreg
181 tSTRspi killed $r0, $sp, 0, 14, $noreg :: (store 4 into %stack.7)
182 tSTRspi killed $r1, $sp, 1, 14, $noreg :: (store 4 into %stack.6)
183 tSTRspi killed $r2, $sp, 2, 14, $noreg :: (store 4 into %stack.5)
184 tSTRspi killed $r3, $sp, 3, 14, $noreg :: (store 4 into %stack.4)
185 t2LoopEnd killed renamable $lr, %bb.3, implicit-def dead $cpsr
189 successors: %bb.2(0x40000000), %bb.1(0x40000000)
191 $r0 = tLDRspi $sp, 7, 14, $noreg :: (load 4 from %stack.0)
192 t2WhileLoopStart killed renamable $r0, %bb.1, implicit-def dead $cpsr