1 # RUN: llc -run-pass=arm-low-overhead-loops %s -verify-machineinstrs -o - | FileCheck %s
3 # CHECK-NOT: DoLoopStart
5 # CHECK: bb.2.for.body:
6 # CHECK: t2CMPri $lr, 0, 14, $cpsr, implicit-def $cpsr
7 # CHECK: t2Bcc %bb.4, 1, $cpsr
8 # CHECK: tB %bb.3, 14, $noreg
9 # CHECK: bb.3.for.cond.cleanup:
10 # CHECK: bb.4.for.header:
13 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
14 target triple = "thumbv8.1m.main-unknown-unknown"
16 define void @size_limit(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) #0 {
18 call void @llvm.set.loop.iterations.i32(i32 %N)
19 br label %for.body.preheader
21 for.body.preheader: ; preds = %entry
22 %scevgep = getelementptr i32, i32* %a, i32 -1
23 %scevgep4 = getelementptr i32, i32* %c, i32 -1
24 %scevgep8 = getelementptr i32, i32* %b, i32 -1
27 for.body: ; preds = %for.header
28 %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
29 %ld1 = load i32, i32* %scevgep11, align 4
30 %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
31 %ld2 = load i32, i32* %scevgep7, align 4
32 %mul = mul nsw i32 %ld2, %ld1
33 %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
34 store i32 %mul, i32* %scevgep3, align 4
35 %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
36 %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
37 %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
38 %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
39 %cmp = icmp ne i32 %count.next, 0
40 br i1 %cmp, label %for.cond.cleanup, label %for.header
42 for.cond.cleanup: ; preds = %for.body
45 for.header: ; preds = %for.body, %for.body.preheader
46 %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
47 %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
48 %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
49 %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
53 ; Function Attrs: nounwind
54 declare i32 @llvm.arm.space(i32, i32) #1
56 ; Function Attrs: noduplicate nounwind
57 declare void @llvm.set.loop.iterations.i32(i32) #2
59 ; Function Attrs: noduplicate nounwind
60 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #2
62 ; Function Attrs: nounwind
63 declare void @llvm.stackprotector(i8*, i8**) #3
65 attributes #0 = { "target-features"="+lob" }
66 attributes #1 = { nounwind "target-features"="+lob" }
67 attributes #2 = { noduplicate nounwind "target-features"="+lob" }
68 attributes #3 = { nounwind }
74 exposesReturnsTwice: false
76 regBankSelected: false
79 tracksRegLiveness: false
83 - { reg: '$r0', virtual-reg: '' }
84 - { reg: '$r1', virtual-reg: '' }
85 - { reg: '$r2', virtual-reg: '' }
86 - { reg: '$r3', virtual-reg: '' }
88 isFrameAddressTaken: false
89 isReturnAddressTaken: false
99 cvBytesOfCalleeSavedRegisters: 0
100 hasOpaqueSPAdjustment: false
102 hasMustTailInVarArgFunc: false
108 - { id: 0, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
109 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
110 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
111 - { id: 1, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
112 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
113 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
114 - { id: 2, name: '', type: spill-slot, offset: -20, size: 4, alignment: 4,
115 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
116 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
117 - { id: 3, name: '', type: spill-slot, offset: -24, size: 4, alignment: 4,
118 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
119 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
120 - { id: 4, name: '', type: spill-slot, offset: -28, size: 4, alignment: 4,
121 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
122 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
123 - { id: 5, name: '', type: spill-slot, offset: -32, size: 4, alignment: 4,
124 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
125 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
126 - { id: 6, name: '', type: spill-slot, offset: -36, size: 4, alignment: 4,
127 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
128 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
129 - { id: 7, name: '', type: spill-slot, offset: -40, size: 4, alignment: 4,
130 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
131 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
132 - { id: 8, name: '', type: spill-slot, offset: -44, size: 4, alignment: 4,
133 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
134 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
135 - { id: 9, name: '', type: spill-slot, offset: -48, size: 4, alignment: 4,
136 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
137 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
138 - { id: 10, name: '', type: spill-slot, offset: -52, size: 4, alignment: 4,
139 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
140 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
141 - { id: 11, name: '', type: spill-slot, offset: -56, size: 4, alignment: 4,
142 stack-id: default, callee-saved-register: '', callee-saved-restored: true,
143 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
144 - { id: 12, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
145 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
146 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
147 - { id: 13, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
148 stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
149 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
152 machineFunctionInfo: {}
155 successors: %bb.1(0x80000000)
157 frame-setup tPUSH 14, $noreg, killed $r4, killed $lr, implicit-def $sp, implicit $sp
158 frame-setup CFI_INSTRUCTION def_cfa_offset 8
159 frame-setup CFI_INSTRUCTION offset $lr, -4
160 frame-setup CFI_INSTRUCTION offset $r4, -8
161 $sp = frame-setup tSUBspi $sp, 12, 14, $noreg
162 frame-setup CFI_INSTRUCTION def_cfa_offset 56
163 t2DoLoopStart renamable $r3
164 tSTRspi killed $r3, $sp, 11, 14, $noreg :: (store 4 into %stack.0)
165 tSTRspi killed $r2, $sp, 10, 14, $noreg :: (store 4 into %stack.1)
166 tSTRspi killed $r1, $sp, 9, 14, $noreg :: (store 4 into %stack.2)
167 tSTRspi killed $r0, $sp, 8, 14, $noreg :: (store 4 into %stack.3)
170 bb.1.for.body.preheader:
171 successors: %bb.4(0x80000000)
173 $r0 = tLDRspi $sp, 8, 14, $noreg :: (load 4 from %stack.3)
174 renamable $r1, dead $cpsr = tSUBi3 killed renamable $r0, 4, 14, $noreg
175 $r2 = tLDRspi $sp, 10, 14, $noreg :: (load 4 from %stack.1)
176 renamable $r3, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14, $noreg
177 $r12 = t2LDRi12 $sp, 36, 14, $noreg :: (load 4 from %stack.2)
178 renamable $lr = t2SUBri killed renamable $r12, 4, 14, $noreg, $noreg
179 $r4 = tLDRspi $sp, 11, 14, $noreg :: (load 4 from %stack.0)
180 t2STRi12 killed $lr, $sp, 28, 14, $noreg :: (store 4 into %stack.4)
181 tSTRspi killed $r3, $sp, 6, 14, $noreg :: (store 4 into %stack.5)
182 tSTRspi killed $r1, $sp, 5, 14, $noreg :: (store 4 into %stack.6)
183 tSTRspi killed $r4, $sp, 4, 14, $noreg :: (store 4 into %stack.7)
187 successors: %bb.3(0x40000000), %bb.4(0x40000000)
189 $r0 = tLDRspi $sp, 3, 14, $noreg :: (load 4 from %stack.8)
190 renamable $r1, renamable $r0 = t2LDR_PRE renamable $r0, 4, 14, $noreg :: (load 4 from %ir.scevgep11)
191 $r2 = tLDRspi $sp, 2, 14, $noreg :: (load 4 from %stack.9)
192 renamable $r3, renamable $r2 = t2LDR_PRE renamable $r2, 4, 14, $noreg :: (load 4 from %ir.scevgep7)
193 renamable $r1, dead $cpsr = nsw tMUL killed renamable $r3, killed renamable $r1, 14, $noreg
194 $r3 = tLDRspi $sp, 1, 14, $noreg :: (load 4 from %stack.10)
195 early-clobber renamable $r3 = t2STR_PRE killed renamable $r1, renamable $r3, 4, 14, $noreg :: (store 4 into %ir.scevgep3)
196 $r1 = tLDRspi $sp, 0, 14, $noreg :: (load 4 from %stack.11)
197 $lr = tMOVr killed $r1, 14, $noreg
198 renamable $lr = t2LoopDec killed renamable $lr, 1
199 $r12 = tMOVr $lr, 14, $noreg
200 tSTRspi killed $r0, $sp, 7, 14, $noreg :: (store 4 into %stack.4)
201 tSTRspi killed $r2, $sp, 6, 14, $noreg :: (store 4 into %stack.5)
202 tSTRspi killed $r3, $sp, 5, 14, $noreg :: (store 4 into %stack.6)
203 t2STRi12 killed $r12, $sp, 16, 14, $noreg :: (store 4 into %stack.7)
204 t2LoopEnd killed renamable $lr, %bb.4
207 bb.3.for.cond.cleanup:
208 $sp = tADDspi $sp, 12, 14, $noreg
209 tPOP_RET 14, $noreg, def $r4, def $pc
212 successors: %bb.2(0x80000000)
214 $r0 = tLDRspi $sp, 4, 14, $noreg :: (load 4 from %stack.7)
215 $r1 = tLDRspi $sp, 5, 14, $noreg :: (load 4 from %stack.6)
216 $r2 = tLDRspi $sp, 6, 14, $noreg :: (load 4 from %stack.5)
217 $r3 = tLDRspi $sp, 7, 14, $noreg :: (load 4 from %stack.4)
218 tSTRspi killed $r0, $sp, 0, 14, $noreg :: (store 4 into %stack.11)
219 tSTRspi killed $r1, $sp, 1, 14, $noreg :: (store 4 into %stack.10)
220 tSTRspi killed $r2, $sp, 2, 14, $noreg :: (store 4 into %stack.9)
221 tSTRspi killed $r3, $sp, 3, 14, $noreg :: (store 4 into %stack.8)