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, i32* nocapture %p, i32* nocapture readonly %q) {
10 %scevgep = getelementptr i32, i32* %q, i32 -1
11 %scevgep3 = getelementptr i32, i32* %p, i32 -1
12 %start = call i32 @llvm.start.loop.iterations.i32(i32 %n)
18 while.body: ; preds = %while.body, %entry
19 %lsr.iv4 = phi i32* [ %scevgep5, %while.body ], [ %scevgep3, %preheader ]
20 %lsr.iv = phi i32* [ %scevgep1, %while.body ], [ %scevgep, %preheader ]
21 %0 = phi i32 [ %start, %preheader ], [ %2, %while.body ]
22 %scevgep6 = getelementptr i32, i32* %lsr.iv, i32 1
23 %scevgep2 = getelementptr i32, i32* %lsr.iv4, i32 1
24 %1 = load i32, i32* %scevgep6, align 4
25 store i32 %1, i32* %scevgep2, align 4
26 %scevgep1 = getelementptr i32, i32* %lsr.iv, i32 1
27 %scevgep5 = getelementptr i32, i32* %lsr.iv4, i32 1
28 %2 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)
29 %3 = icmp ne i32 %2, 0
30 br i1 %3, label %while.body, label %while.end
32 while.end: ; preds = %while.body
36 declare i32 @llvm.start.loop.iterations.i32(i32) #0
37 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #0
39 attributes #0 = { noduplicate nounwind }
40 attributes #1 = { nounwind }
46 exposesReturnsTwice: false
48 regBankSelected: false
51 tracksRegLiveness: true
55 - { reg: '$r0', virtual-reg: '' }
56 - { reg: '$r1', virtual-reg: '' }
57 - { reg: '$r2', virtual-reg: '' }
59 isFrameAddressTaken: false
60 isReturnAddressTaken: false
70 cvBytesOfCalleeSavedRegisters: 0
71 hasOpaqueSPAdjustment: false
73 hasMustTailInVarArgFunc: false
79 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
80 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
81 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
82 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
83 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
84 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
87 machineFunctionInfo: {}
89 ; CHECK-LABEL: name: do_copy
91 ; CHECK: successors: %bb.1(0x80000000)
92 ; CHECK: liveins: $r0, $r2, $r7
93 ; CHECK: frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r7, implicit-def $sp, implicit $sp
94 ; CHECK: frame-setup CFI_INSTRUCTION def_cfa_offset 8
95 ; CHECK: frame-setup CFI_INSTRUCTION offset $lr, -4
96 ; CHECK: frame-setup CFI_INSTRUCTION offset $r7, -8
97 ; CHECK: $lr = t2DLS killed $r0
98 ; CHECK: renamable $r0 = t2SUBri killed renamable $lr, 4, 14 /* CC::al */, $noreg, def dead $cpsr
99 ; CHECK: renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14 /* CC::al */, $noreg
100 ; CHECK: bb.1.preheader:
101 ; CHECK: successors: %bb.2(0x80000000)
102 ; CHECK: liveins: $r0, $r1
103 ; CHECK: $lr = tMOVr $r0, 14 /* CC::al */, $noreg
104 ; CHECK: bb.2.while.body:
105 ; CHECK: successors: %bb.2(0x7c000000), %bb.3(0x04000000)
106 ; CHECK: liveins: $lr, $r0, $r1
107 ; CHECK: renamable $r2, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14 /* CC::al */, $noreg :: (load (s32) from %ir.scevgep6)
108 ; CHECK: early-clobber renamable $r0 = t2STR_PRE killed renamable $r2, killed renamable $r0, 4, 14 /* CC::al */, $noreg :: (store (s32) into %ir.scevgep2)
109 ; CHECK: $lr = t2LEUpdate killed renamable $lr, %bb.2
110 ; CHECK: bb.3.while.end:
111 ; CHECK: $r0, dead $cpsr = tMOVi8 0, 14 /* CC::al */, $noreg
112 ; CHECK: tPOP_RET 14 /* CC::al */, $noreg, def $r7, def $pc, implicit killed $r0
114 successors: %bb.1(0x80000000)
115 liveins: $r0, $r1, $r2, $r7, $lr
117 frame-setup tPUSH 14, $noreg, killed $r7, implicit-def $sp, implicit $sp
118 frame-setup CFI_INSTRUCTION def_cfa_offset 8
119 frame-setup CFI_INSTRUCTION offset $lr, -4
120 frame-setup CFI_INSTRUCTION offset $r7, -8
121 $lr = t2DoLoopStart $r0
122 renamable $r0 = t2SUBri killed renamable $lr, 4, 14, $noreg, def $cpsr
123 renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14, $noreg
126 successors: %bb.2(0x80000000)
128 $lr = tMOVr $r0, 14, $noreg
131 successors: %bb.2(0x7c000000), %bb.3(0x04000000)
132 liveins: $lr, $r0, $r1
134 renamable $r2, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14, $noreg :: (load (s32) from %ir.scevgep6)
135 early-clobber renamable $r0 = t2STR_PRE killed renamable $r2, killed renamable $r0, 4, 14, $noreg :: (store (s32) into %ir.scevgep2)
136 renamable $lr = t2LoopDec killed renamable $lr, 1
137 t2LoopEnd renamable $lr, %bb.2, implicit-def dead $cpsr
141 $r0, dead $cpsr = tMOVi8 0, 14, $noreg
142 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0