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 -verify-machineinstrs %s -o - | FileCheck %s
3 # Check that subs isn't used during the revert because there's a def after LoopDec.
6 define i32 @do_copy(i32 %n, ptr nocapture %p, ptr nocapture readonly %q) {
8 %scevgep = getelementptr i32, ptr %q, i32 -1
9 %scevgep3 = getelementptr i32, ptr %p, i32 -1
10 %start = call i32 @llvm.start.loop.iterations.i32(i32 %n)
11 %limit = lshr i32 %n, 1
14 while.body: ; preds = %while.body, %entry
15 %lsr.iv4 = phi ptr [ %scevgep5, %while.body ], [ %scevgep3, %entry ]
16 %lsr.iv = phi ptr [ %scevgep1, %while.body ], [ %scevgep, %entry ]
17 %tmp = phi i32 [ %start, %entry ], [ %tmp2, %while.body ]
18 %scevgep7 = getelementptr i32, ptr %lsr.iv, i32 1
19 %scevgep4 = getelementptr i32, ptr %lsr.iv4, i32 1
20 %tmp1 = load i32, ptr %scevgep7, align 4
21 %tmp2 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %tmp, i32 1)
22 %half = lshr i32 %tmp1, 1
23 %cmp = icmp ult i32 %tmp, %limit
24 %res = select i1 %cmp, i32 %tmp1, i32 %half
25 store i32 %res, ptr %scevgep4, align 4
26 %scevgep1 = getelementptr i32, ptr %lsr.iv, i32 1
27 %scevgep5 = getelementptr i32, ptr %lsr.iv4, i32 1
28 %tmp3 = icmp ne i32 %tmp2, 0
29 br i1 %tmp3, label %while.body, label %while.end
31 while.end: ; preds = %while.body
35 declare i32 @llvm.start.loop.iterations.i32(i32) #0
37 declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #0
39 declare void @llvm.stackprotector(ptr, ptr) #1
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: $r0, $r1, $r2, $r7, $lr
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: $lr = tMOVr killed $r0, 14 /* CC::al */, $noreg
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
103 ; CHECK-NEXT: renamable $r2 = t2LSRri renamable $lr, 1, 14 /* CC::al */, $noreg, $noreg
104 ; CHECK-NEXT: $lr = tMOVr renamable $lr, 14 /* CC::al */, $noreg
106 ; CHECK-NEXT: bb.1.while.body:
107 ; CHECK-NEXT: successors: %bb.1(0x7c000000), %bb.2(0x04000000)
108 ; CHECK-NEXT: liveins: $lr, $r0, $r1, $r2
110 ; CHECK-NEXT: renamable $r3, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14 /* CC::al */, $noreg :: (load (s32) from %ir.scevgep7)
111 ; CHECK-NEXT: tCMPhir renamable $lr, renamable $r2, 14 /* CC::al */, $noreg, implicit-def $cpsr
112 ; CHECK-NEXT: renamable $lr = t2SUBri killed renamable $lr, 1, 14 /* CC::al */, $noreg, $noreg
113 ; CHECK-NEXT: t2IT 2, 8, implicit-def $itstate
114 ; CHECK-NEXT: renamable $r3 = tLSRri $noreg, killed renamable $r3, 1, 2 /* CC::hs */, killed $cpsr, implicit renamable $r3, implicit killed $itstate
115 ; CHECK-NEXT: early-clobber renamable $r0 = t2STR_PRE killed renamable $r3, killed renamable $r0, 4, 14 /* CC::al */, $noreg :: (store (s32) into %ir.scevgep4)
116 ; CHECK-NEXT: t2CMPri renamable $lr, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
117 ; CHECK-NEXT: tBcc %bb.1, 4 /* CC::mi */, killed $cpsr
118 ; CHECK-NEXT: tB %bb.2, 14 /* CC::al */, $noreg
120 ; CHECK-NEXT: bb.2.while.end:
121 ; CHECK-NEXT: $r0, dead $cpsr = tMOVi8 0, 14 /* CC::al */, $noreg
122 ; CHECK-NEXT: tPOP_RET 14 /* CC::al */, $noreg, def $r7, def $pc, implicit killed $r0
124 successors: %bb.1(0x80000000)
125 liveins: $r0, $r1, $r2, $r7, $lr
127 frame-setup tPUSH 14, $noreg, killed $r7, killed $lr, implicit-def $sp, implicit $sp
128 frame-setup CFI_INSTRUCTION def_cfa_offset 8
129 frame-setup CFI_INSTRUCTION offset $lr, -4
130 frame-setup CFI_INSTRUCTION offset $r7, -8
131 $lr = tMOVr killed $r0, 14, $noreg
132 renamable $r0, dead $cpsr = tSUBi3 killed renamable $r1, 4, 14, $noreg
133 renamable $r1, dead $cpsr = tSUBi3 killed renamable $r2, 4, 14, $noreg
134 renamable $r2 = t2LSRri renamable $lr, 1, 14, $noreg, $noreg
135 $lr = t2DoLoopStart renamable $lr
138 successors: %bb.1(0x7c000000), %bb.2(0x04000000)
139 liveins: $lr, $r0, $r1, $r2
141 renamable $r3, renamable $r1 = t2LDR_PRE killed renamable $r1, 4, 14, $noreg :: (load (s32) from %ir.scevgep7)
142 tCMPhir renamable $lr, renamable $r2, 14, $noreg, implicit-def $cpsr
143 renamable $lr = t2LoopDec killed renamable $lr, 1
144 t2IT 2, 8, implicit-def $itstate
145 renamable $r3 = tLSRri $noreg, killed renamable $r3, 1, 2, killed $cpsr, implicit renamable $r3, implicit killed $itstate
146 early-clobber renamable $r0 = t2STR_PRE killed renamable $r3, killed renamable $r0, 4, 14, $noreg :: (store (s32) into %ir.scevgep4)
147 t2CMPri renamable $lr, 0, 14, $noreg, implicit-def $cpsr
148 tBcc %bb.1, 4, killed $cpsr
152 $r0, dead $cpsr = tMOVi8 0, 14, $noreg
153 tPOP_RET 14, $noreg, def $r7, def $pc, implicit killed $r0