1 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
2 # RUN: llc -mtriple=armv8.1m.main -run-pass=arm-low-overhead-loops --verify-machineinstrs %s -o - | FileCheck %s
5 source_filename = "size-limit.ll"
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 dso_local arm_aapcscc void @size_limit(ptr nocapture %a, ptr nocapture readonly %b, ptr nocapture readonly %c, i32 %N) {
11 %cmp8 = icmp eq i32 %N, 0
12 br i1 %cmp8, label %for.cond.cleanup, label %for.body.preheader
14 for.body.preheader: ; preds = %entry
15 %scevgep = getelementptr i32, ptr %a, i32 -1
16 %scevgep4 = getelementptr i32, ptr %c, i32 -1
17 %scevgep8 = getelementptr i32, ptr %b, i32 -1
18 %start = call i32 @llvm.start.loop.iterations.i32(i32 %N)
21 for.cond.cleanup: ; preds = %for.body, %entry
24 for.body: ; preds = %for.body, %for.body.preheader
25 %lsr.iv9 = phi ptr [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
26 %lsr.iv5 = phi ptr [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
27 %lsr.iv1 = phi ptr [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
28 %0 = phi i32 [ %start, %for.body.preheader ], [ %3, %for.body ]
29 %size = call i32 @llvm.arm.space(i32 4070, i32 undef)
30 %scevgep3 = getelementptr i32, ptr %lsr.iv9, i32 1
31 %1 = load i32, ptr %scevgep3, align 4
32 %scevgep7 = getelementptr i32, ptr %lsr.iv5, i32 1
33 %2 = load i32, ptr %scevgep7, align 4
34 %mul = mul nsw i32 %2, %1
35 %scevgep11 = getelementptr i32, ptr %lsr.iv1, i32 1
36 store i32 %mul, ptr %scevgep11, align 4
37 %scevgep2 = getelementptr i32, ptr %lsr.iv1, i32 1
38 %scevgep6 = getelementptr i32, ptr %lsr.iv5, i32 1
39 %scevgep10 = getelementptr i32, ptr %lsr.iv9, i32 1
40 %3 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)
41 %4 = icmp ne i32 %3, 0
42 br i1 %4, label %for.body, label %for.cond.cleanup
45 declare i32 @llvm.arm.space(i32 immarg, i32) #0
47 declare i32 @llvm.start.loop.iterations.i32(i32) #1
49 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #1
51 declare void @llvm.stackprotector(ptr, ptr) #0
53 attributes #0 = { nounwind }
54 attributes #1 = { noduplicate nounwind }
60 exposesReturnsTwice: false
62 regBankSelected: false
65 tracksRegLiveness: true
69 - { reg: '$r0', virtual-reg: '' }
70 - { reg: '$r1', virtual-reg: '' }
71 - { reg: '$r2', virtual-reg: '' }
72 - { reg: '$r3', virtual-reg: '' }
74 isFrameAddressTaken: false
75 isReturnAddressTaken: false
85 cvBytesOfCalleeSavedRegisters: 0
86 hasOpaqueSPAdjustment: false
88 hasMustTailInVarArgFunc: false
94 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
95 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
96 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
97 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
98 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
99 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
102 machineFunctionInfo: {}
104 ; CHECK-LABEL: name: size_limit
106 ; CHECK-NEXT: successors: %bb.1(0x80000000)
107 ; CHECK-NEXT: liveins: $lr, $r0, $r1, $r2, $r3, $r7
109 ; CHECK-NEXT: frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
110 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION def_cfa_offset 8
111 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION offset $lr, -4
112 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION offset $r7, -8
113 ; CHECK-NEXT: tCMPi8 $r3, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
114 ; CHECK-NEXT: t2IT 0, 8, implicit-def $itstate
115 ; CHECK-NEXT: tPOP_RET 0 /* CC::eq */, killed $cpsr, def $r7, def $pc, implicit killed $itstate
117 ; CHECK-NEXT: bb.1.for.body.preheader:
118 ; CHECK-NEXT: successors: %bb.2(0x80000000)
119 ; CHECK-NEXT: liveins: $r0, $r1, $r2, $r3
121 ; CHECK-NEXT: renamable $r1, dead $cpsr = tSUBi8 killed renamable $r1, 4, 14 /* CC::al */, $noreg
122 ; CHECK-NEXT: renamable $r2, dead $cpsr = tSUBi8 killed renamable $r2, 4, 14 /* CC::al */, $noreg
123 ; CHECK-NEXT: renamable $r0, dead $cpsr = tSUBi8 killed renamable $r0, 4, 14 /* CC::al */, $noreg
124 ; CHECK-NEXT: dead $lr = tMOVr $r3, 14 /* CC::al */, $noreg
125 ; CHECK-NEXT: $lr = t2DLS killed $r3
127 ; CHECK-NEXT: bb.2.for.body:
128 ; CHECK-NEXT: successors: %bb.2(0x7c000000), %bb.3(0x04000000)
129 ; CHECK-NEXT: liveins: $lr, $r0, $r1, $r2
131 ; CHECK-NEXT: dead renamable $r3 = SPACE 4070, undef renamable $r0
132 ; CHECK-NEXT: renamable $r12, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14 /* CC::al */, $noreg :: (load (s32) from %ir.scevgep3)
133 ; CHECK-NEXT: renamable $r3, renamable $r2 = t2LDR_PRE killed renamable $r2, 4, 14 /* CC::al */, $noreg :: (load (s32) from %ir.scevgep7)
134 ; CHECK-NEXT: renamable $r3 = nsw t2MUL killed renamable $r3, killed renamable $r12, 14 /* CC::al */, $noreg
135 ; CHECK-NEXT: early-clobber renamable $r0 = t2STR_PRE killed renamable $r3, killed renamable $r0, 4, 14 /* CC::al */, $noreg :: (store (s32) into %ir.scevgep11)
136 ; CHECK-NEXT: $lr = t2LEUpdate killed renamable $lr, %bb.2
138 ; CHECK-NEXT: bb.3.for.cond.cleanup:
139 ; CHECK-NEXT: tPOP_RET 14 /* CC::al */, $noreg, def $r7, def $pc
141 successors: %bb.1(0x80000000)
142 liveins: $r0, $r1, $r2, $r3, $r7, $lr
144 frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
145 frame-setup CFI_INSTRUCTION def_cfa_offset 8
146 frame-setup CFI_INSTRUCTION offset $lr, -4
147 frame-setup CFI_INSTRUCTION offset $r7, -8
148 tCMPi8 $r3, 0, 14, $noreg, implicit-def $cpsr
149 t2IT 0, 8, implicit-def $itstate
150 tPOP_RET 0, killed $cpsr, def $r7, def $pc, implicit killed $itstate
152 bb.1.for.body.preheader:
153 successors: %bb.2(0x80000000)
154 liveins: $r0, $r1, $r2, $r3, $r7, $lr
156 renamable $r1, dead $cpsr = tSUBi8 killed renamable $r1, 4, 14, $noreg
157 renamable $r2, dead $cpsr = tSUBi8 killed renamable $r2, 4, 14, $noreg
158 renamable $r0, dead $cpsr = tSUBi8 killed renamable $r0, 4, 14, $noreg
159 $lr = tMOVr $r3, 14, $noreg
160 $lr = t2DoLoopStart killed $r3
163 successors: %bb.2(0x7c000000), %bb.3(0x04000000)
164 liveins: $lr, $r0, $r1, $r2
166 dead renamable $r3 = SPACE 4070, undef renamable $r0
167 renamable $r12, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14, $noreg :: (load (s32) from %ir.scevgep3)
168 renamable $r3, renamable $r2 = t2LDR_PRE killed renamable $r2, 4, 14, $noreg :: (load (s32) from %ir.scevgep7)
169 renamable $r3 = nsw t2MUL killed renamable $r3, killed renamable $r12, 14, $noreg
170 early-clobber renamable $r0 = t2STR_PRE killed renamable $r3, killed renamable $r0, 4, 14, $noreg :: (store (s32) into %ir.scevgep11)
171 renamable $lr = t2LoopDec killed renamable $lr, 1
172 t2LoopEnd renamable $lr, %bb.2, implicit-def dead $cpsr
175 bb.3.for.cond.cleanup:
176 tPOP_RET 14, $noreg, def $r7, def $pc