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
4 # TODO: Explore the preheader to remove the redundant tMOVr
7 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
8 target triple = "thumbv8.1m.main"
10 define i32 @do_copy(i32 %n, ptr nocapture %p, ptr nocapture readonly %q) {
12 %scevgep = getelementptr i32, ptr %q, i32 -1
13 %scevgep3 = getelementptr i32, ptr %p, i32 -1
14 %start = call i32 @llvm.start.loop.iterations.i32(i32 %n)
20 while.body: ; preds = %while.body, %entry
21 %lsr.iv4 = phi ptr [ %scevgep5, %while.body ], [ %scevgep3, %preheader ]
22 %lsr.iv = phi ptr [ %scevgep1, %while.body ], [ %scevgep, %preheader ]
23 %0 = phi i32 [ %start, %preheader ], [ %2, %while.body ]
24 %scevgep6 = getelementptr i32, ptr %lsr.iv, i32 1
25 %scevgep2 = getelementptr i32, ptr %lsr.iv4, i32 1
26 %1 = load i32, ptr %scevgep6, align 4
27 store i32 %1, ptr %scevgep2, align 4
28 %scevgep1 = getelementptr i32, ptr %lsr.iv, i32 1
29 %scevgep5 = getelementptr i32, ptr %lsr.iv4, i32 1
30 %2 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %0, i32 1)
31 %3 = icmp ne i32 %2, 0
32 br i1 %3, label %while.body, label %while.end
34 while.end: ; preds = %while.body
38 declare i32 @llvm.start.loop.iterations.i32(i32) #0
39 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #0
41 attributes #0 = { noduplicate nounwind }
42 attributes #1 = { nounwind }
48 exposesReturnsTwice: false
50 regBankSelected: false
53 tracksRegLiveness: true
57 - { reg: '$r0', virtual-reg: '' }
58 - { reg: '$r1', virtual-reg: '' }
59 - { reg: '$r2', virtual-reg: '' }
61 isFrameAddressTaken: false
62 isReturnAddressTaken: false
72 cvBytesOfCalleeSavedRegisters: 0
73 hasOpaqueSPAdjustment: false
75 hasMustTailInVarArgFunc: false
81 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
82 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
83 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
84 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
85 stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
86 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
89 machineFunctionInfo: {}
91 ; CHECK-LABEL: name: do_copy
93 ; CHECK-NEXT: successors: %bb.1(0x80000000)
94 ; CHECK-NEXT: liveins: $lr, $r0, $r1, $r2, $r7
96 ; CHECK-NEXT: frame-setup tPUSH 14 /* CC::al */, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
97 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION def_cfa_offset 8
98 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION offset $lr, -4
99 ; CHECK-NEXT: frame-setup CFI_INSTRUCTION offset $r7, -8
100 ; CHECK-NEXT: dead $lr = t2DLS killed $r0
101 ; CHECK-NEXT: renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 4, 14 /* CC::al */, $noreg
102 ; CHECK-NEXT: renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14 /* CC::al */, $noreg
104 ; CHECK-NEXT: bb.1.preheader:
105 ; CHECK-NEXT: successors: %bb.2(0x80000000)
106 ; CHECK-NEXT: liveins: $r0, $r1
108 ; CHECK-NEXT: $lr = tMOVr $r0, 14 /* CC::al */, $noreg
110 ; CHECK-NEXT: bb.2.while.body:
111 ; CHECK-NEXT: successors: %bb.2(0x7c000000), %bb.3(0x04000000)
112 ; CHECK-NEXT: liveins: $lr, $r0, $r1
114 ; CHECK-NEXT: renamable $r2, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14 /* CC::al */, $noreg :: (load (s32) from %ir.scevgep6)
115 ; CHECK-NEXT: early-clobber renamable $r0 = t2STR_PRE killed renamable $r2, killed renamable $r0, 4, 14 /* CC::al */, $noreg :: (store (s32) into %ir.scevgep2)
116 ; CHECK-NEXT: $lr = t2LEUpdate killed renamable $lr, %bb.2
118 ; CHECK-NEXT: bb.3.while.end:
119 ; CHECK-NEXT: $r0, dead $cpsr = tMOVi8 0, 14 /* CC::al */, $noreg
120 ; CHECK-NEXT: tPOP_RET 14 /* CC::al */, $noreg, def $r7, def $pc, implicit killed $r0
122 successors: %bb.1(0x80000000)
123 liveins: $r0, $r1, $r2, $r7, $lr
125 frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
126 frame-setup CFI_INSTRUCTION def_cfa_offset 8
127 frame-setup CFI_INSTRUCTION offset $lr, -4
128 frame-setup CFI_INSTRUCTION offset $r7, -8
129 $lr = t2DoLoopStart $r0
130 renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 4, 14, $noreg
131 renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14, $noreg
134 successors: %bb.2(0x80000000)
136 $lr = tMOVr $r0, 14, $noreg
139 successors: %bb.2(0x7c000000), %bb.3(0x04000000)
140 liveins: $lr, $r0, $r1
142 renamable $r2, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14, $noreg :: (load (s32) from %ir.scevgep6)
143 early-clobber renamable $r0 = t2STR_PRE killed renamable $r2, killed renamable $r0, 4, 14, $noreg :: (store (s32) into %ir.scevgep2)
144 renamable $lr = t2LoopDec killed renamable $lr, 1
145 t2LoopEnd renamable $lr, %bb.2, implicit-def dead $cpsr
149 $r0, dead $cpsr = tMOVi8 0, 14, $noreg
150 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0