1 # NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py
2 # RUN: llc -mtriple=thumbv8.1m.main -run-pass=arm-low-overhead-loops %s -verify-machineinstrs -o - | FileCheck %s
5 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
6 target triple = "thumbv8.1m.main"
8 define i32 @do_copy(i32 %n, ptr nocapture %p, ptr nocapture readonly %q) {
10 %scevgep = getelementptr i32, ptr %q, i32 -1
11 %scevgep3 = getelementptr i32, ptr %p, i32 -1
12 %start = call i32 @llvm.start.loop.iterations.i32(i32 %n)
15 while.body: ; preds = %while.body, %entry
16 %lsr.iv4 = phi ptr [ %scevgep5, %while.body ], [ %scevgep3, %entry ]
17 %lsr.iv = phi ptr [ %scevgep1, %while.body ], [ %scevgep, %entry ]
18 %0 = phi i32 [ %start, %entry ], [ %2, %while.body ]
19 %scevgep6 = getelementptr i32, ptr %lsr.iv, i32 1
20 %scevgep2 = getelementptr i32, ptr %lsr.iv4, i32 1
21 %1 = load i32, ptr %scevgep6, align 4
22 store i32 %1, ptr %scevgep2, align 4
23 %scevgep1 = getelementptr i32, ptr %lsr.iv, i32 1
24 %scevgep5 = getelementptr i32, ptr %lsr.iv4, i32 1
25 %2 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)
26 %3 = icmp ne i32 %2, 0
27 br i1 %3, label %while.body, label %while.end
29 while.end: ; preds = %while.body
33 declare i32 @llvm.start.loop.iterations.i32(i32) #0
34 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #0
36 attributes #0 = { noduplicate nounwind }
37 attributes #1 = { nounwind }
43 exposesReturnsTwice: false
45 regBankSelected: false
48 tracksRegLiveness: true
52 - { reg: '$r0', virtual-reg: '' }
53 - { reg: '$r1', virtual-reg: '' }
54 - { reg: '$r2', virtual-reg: '' }
56 isFrameAddressTaken: false
57 isReturnAddressTaken: false
67 cvBytesOfCalleeSavedRegisters: 0
68 hasOpaqueSPAdjustment: false
70 hasMustTailInVarArgFunc: false
76 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
77 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
78 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
79 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
80 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
81 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
84 machineFunctionInfo: {}
86 ; CHECK-LABEL: name: do_copy
88 ; CHECK-NEXT: successors: %bb.1(0x80000000)
89 ; CHECK-NEXT: liveins: $lr, $r0, $r1, $r2, $r7
91 ; CHECK-NEXT: frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
92 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION def_cfa_offset 8
93 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION offset $lr, -4
94 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION offset $r7, -8
95 ; CHECK-NEXT: dead $lr = tMOVr $r0, 14 /* CC::al */, $noreg
96 ; CHECK-NEXT: $lr = t2DLS killed $r0
97 ; CHECK-NEXT: renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 4, 14 /* CC::al */, $noreg
98 ; CHECK-NEXT: renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14 /* CC::al */, $noreg
100 ; CHECK-NEXT: bb.1.while.body:
101 ; CHECK-NEXT: successors: %bb.1(0x7c000000), %bb.2(0x04000000)
102 ; CHECK-NEXT: liveins: $lr, $r0, $r1
104 ; CHECK-NEXT: renamable $r2, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14 /* CC::al */, $noreg :: (load (s32) from %ir.scevgep6)
105 ; CHECK-NEXT: early-clobber renamable $r0 = t2STR_PRE killed renamable $r2, killed renamable $r0, 4, 14 /* CC::al */, $noreg :: (store (s32) into %ir.scevgep2)
106 ; CHECK-NEXT: $lr = t2LEUpdate killed renamable $lr, %bb.1
108 ; CHECK-NEXT: bb.2.while.end:
109 ; CHECK-NEXT: $r0, dead $cpsr = tMOVi8 0, 14 /* CC::al */, $noreg
110 ; CHECK-NEXT: tPOP_RET 14 /* CC::al */, $noreg, def $r7, def $pc, implicit killed $r0
112 successors: %bb.1(0x80000000)
113 liveins: $r0, $r1, $r2, $r7, $lr
115 frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
116 frame-setup CFI_INSTRUCTION def_cfa_offset 8
117 frame-setup CFI_INSTRUCTION offset $lr, -4
118 frame-setup CFI_INSTRUCTION offset $r7, -8
119 $lr = tMOVr $r0, 14, $noreg
120 $lr = t2DoLoopStart killed $r0
121 renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 4, 14, $noreg
122 renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14, $noreg
125 successors: %bb.1(0x7c000000), %bb.2(0x04000000)
126 liveins: $lr, $r0, $r1
128 renamable $r2, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14, $noreg :: (load (s32) from %ir.scevgep6)
129 early-clobber renamable $r0 = t2STR_PRE killed renamable $r2, killed renamable $r0, 4, 14, $noreg :: (store (s32) into %ir.scevgep2)
130 renamable $lr = t2LoopDec killed renamable $lr, 1
131 t2LoopEnd renamable $lr, %bb.1, implicit-def dead $cpsr
135 $r0, dead $cpsr = tMOVi8 0, 14, $noreg
136 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0