# RUN: llc -mtriple=thumbv8.1m.main -run-pass=arm-low-overhead-loops --verify-machineinstrs %s -o - | FileCheck %s
# CHECK-NOT: t2DLS
# CHECK: bb.5.for.inc16:
# CHECK: $lr = t2SUBri killed renamable $lr, 1, 14 /* CC::al */, $noreg, def $cpsr
# CHECK-NOT: t2CMPri $lr
# CHECK: tBcc %bb.6, 1 /* CC::ne */
# CHECK: tB %bb.2
# CHECK: bb.6.for.cond4.preheader:
--- |
; ModuleID = 'revert-non-header.ll'
source_filename = "revert-non-header.ll"
target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "thumbv8.1m.main"
define void @header_not_target_unrolled_loop(i32* nocapture %v, i32 %n) {
entry:
%cmp56 = icmp sgt i32 %n, 1
br i1 %cmp56, label %for.cond1.preheader.preheader, label %for.end20
for.cond1.preheader.preheader: ; preds = %entry
br label %for.cond1.preheader
for.cond.loopexit: ; preds = %for.inc16, %for.cond1.preheader
%cmp = icmp sgt i32 %gap.057.in, 3
br i1 %cmp, label %for.cond1.preheader, label %for.end20
for.cond1.preheader: ; preds = %for.cond1.preheader.preheader, %for.cond.loopexit
%gap.057.in = phi i32 [ %gap.057, %for.cond.loopexit ], [ %n, %for.cond1.preheader.preheader ]
%gap.057 = sdiv i32 %gap.057.in, 2
%cmp252 = icmp slt i32 %gap.057, %n
%tmp = sub i32 %n, %gap.057
%start = call i32 @llvm.start.loop.iterations.i32(i32 %tmp)
br i1 %cmp252, label %for.cond4.preheader.preheader, label %for.cond.loopexit
for.cond4.preheader.preheader: ; preds = %for.cond1.preheader
%tmp2 = mul i32 %gap.057, -4
%tmp6 = mul i32 %gap.057, -2
%scevgep1 = getelementptr i32, i32* %v, i32 %gap.057
%0 = shl i32 %gap.057, 2
br label %for.cond4.preheader
for.cond4.preheader: ; preds = %for.inc16, %for.cond4.preheader.preheader
%lsr.iv2 = phi i32* [ %scevgep3, %for.inc16 ], [ %scevgep1, %for.cond4.preheader.preheader ]
%lsr.iv = phi i32* [ %v, %for.cond4.preheader.preheader ], [ %scevgep, %for.inc16 ]
%i.053 = phi i32 [ %inc, %for.inc16 ], [ %gap.057, %for.cond4.preheader.preheader ]
%tmp8 = phi i32 [ %start, %for.cond4.preheader.preheader ], [ %tmp16, %for.inc16 ]
%j.048 = sub nsw i32 %i.053, %gap.057
%cmp549 = icmp sgt i32 %j.048, -1
br i1 %cmp549, label %land.rhs.preheader, label %for.inc16
land.rhs.preheader: ; preds = %for.cond4.preheader
br label %land.rhs
land.rhs: ; preds = %land.rhs.preheader, %for.body8
%lsr.iv4 = phi i32 [ %lsr.iv.next, %for.body8 ], [ 0, %land.rhs.preheader ]
%j.051 = phi i32 [ %j.0, %for.body8 ], [ %j.048, %land.rhs.preheader ]
%1 = bitcast i32* %lsr.iv2 to i8*
%2 = bitcast i32* %lsr.iv to i8*
%uglygep3 = getelementptr i8, i8* %2, i32 %lsr.iv4
%uglygep34 = bitcast i8* %uglygep3 to i32*
%tmp9 = load i32, i32* %uglygep34, align 4
%uglygep1 = getelementptr i8, i8* %1, i32 %lsr.iv4
%uglygep12 = bitcast i8* %uglygep1 to i32*
%tmp12 = load i32, i32* %uglygep12, align 4
%cmp7 = icmp sgt i32 %tmp9, %tmp12
br i1 %cmp7, label %for.body8, label %for.inc16
for.body8: ; preds = %land.rhs
%3 = bitcast i32* %lsr.iv2 to i8*
%4 = bitcast i32* %lsr.iv to i8*
%sunkaddr = getelementptr i8, i8* %4, i32 %lsr.iv4
%5 = bitcast i8* %sunkaddr to i32*
store i32 %tmp12, i32* %5, align 4
%uglygep = getelementptr i8, i8* %3, i32 %lsr.iv4
%uglygep6 = bitcast i8* %uglygep to i32*
store i32 %tmp9, i32* %uglygep6, align 4
%j.0 = sub nsw i32 %j.051, %gap.057
%lsr.iv.next = add i32 %lsr.iv4, %0
%cmp5 = icmp sgt i32 %j.0, -1
br i1 %cmp5, label %land.rhs, label %for.inc16
for.inc16: ; preds = %for.body8, %land.rhs, %for.cond4.preheader
%inc = add nsw i32 %i.053, 1
%scevgep = getelementptr i32, i32* %lsr.iv, i32 1
%tmp16 = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %tmp8, i32 1)
%tmp17 = icmp ne i32 %tmp16, 0
%scevgep3 = getelementptr i32, i32* %lsr.iv2, i32 1
br i1 %tmp17, label %for.cond4.preheader, label %for.cond.loopexit
for.end20: ; preds = %for.cond.loopexit, %entry
ret void
}
; Function Attrs: noduplicate nounwind
declare i32 @llvm.start.loop.iterations.i32(i32) #0
; Function Attrs: noduplicate nounwind
declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32) #0
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**) #1
attributes #0 = { noduplicate nounwind }
attributes #1 = { nounwind }
...
---
name: header_not_target_unrolled_loop
alignment: 2
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
failedISel: false
tracksRegLiveness: true
hasWinCFI: false
registers: []
liveins:
- { reg: '$r0', virtual-reg: '' }
- { reg: '$r1', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 32
offsetAdjustment: 0
maxAlignment: 4
adjustsStack: false
hasCalls: false
stackProtector: ''
maxCallFrameSize: 0
cvBytesOfCalleeSavedRegisters: 0
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
localFrameSize: 0
savePoint: ''
restorePoint: ''
fixedStack: []
stack:
- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r10', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r9', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r8', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 4, name: '', type: spill-slot, offset: -20, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r7', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 5, name: '', type: spill-slot, offset: -24, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r6', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 6, name: '', type: spill-slot, offset: -28, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r5', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
- { id: 7, name: '', type: spill-slot, offset: -32, size: 4, alignment: 4,
stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
callSites: []
constants: []
machineFunctionInfo: {}
body: |
bb.0.entry:
successors: %bb.1(0x40000000), %bb.9(0x40000000)
liveins: $r0, $r1, $r4, $r5, $r6, $r7, $r8, $r9, $r10, $lr
$sp = frame-setup t2STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r5, killed $r6, killed $r7, killed $r8, killed $r9, killed $r10, killed $lr
frame-setup CFI_INSTRUCTION def_cfa_offset 32
frame-setup CFI_INSTRUCTION offset $lr, -4
frame-setup CFI_INSTRUCTION offset $r10, -8
frame-setup CFI_INSTRUCTION offset $r9, -12
frame-setup CFI_INSTRUCTION offset $r8, -16
frame-setup CFI_INSTRUCTION offset $r7, -20
frame-setup CFI_INSTRUCTION offset $r6, -24
frame-setup CFI_INSTRUCTION offset $r5, -28
frame-setup CFI_INSTRUCTION offset $r4, -32
tCMPi8 renamable $r1, 2, 14, $noreg, implicit-def $cpsr
tBcc %bb.9, 11, killed $cpsr
bb.1:
successors: %bb.3(0x80000000)
liveins: $r0, $r1
$r9 = tMOVr $r1, 14, $noreg
tB %bb.3, 14, $noreg
bb.2.for.cond.loopexit:
successors: %bb.3(0x7c000000), %bb.9(0x04000000)
liveins: $r0, $r1, $r9, $r12
t2CMPri killed renamable $r12, 4, 14, $noreg, implicit-def $cpsr
tBcc %bb.9, 11, killed $cpsr
bb.3.for.cond1.preheader:
successors: %bb.4(0x40000000), %bb.2(0x40000000)
liveins: $r0, $r1, $r9
renamable $r2 = t2ADDrs $r9, $r9, 251, 14, $noreg, $noreg
$r12 = tMOVr killed $r9, 14, $noreg
renamable $lr = t2SUBrs renamable $r1, renamable $r2, 9, 14, $noreg, $noreg
renamable $r9 = t2ASRri renamable $r2, 1, 14, $noreg, $noreg
t2CMPrs renamable $r1, killed renamable $r2, 9, 14, $noreg, implicit-def $cpsr
$lr = t2DoLoopStart renamable $lr
tBcc %bb.2, 13, killed $cpsr
bb.4.for.cond4.preheader.preheader:
successors: %bb.7(0x50000000), %bb.5(0x30000000)
liveins: $lr, $r0, $r1, $r9, $r12
renamable $r3 = t2ADDrs renamable $r0, renamable $r9, 18, 14, $noreg, $noreg
renamable $r10 = t2LSLri renamable $r9, 2, 14, $noreg, $noreg
$r5 = tMOVr $r0, 14, $noreg
$r8 = tMOVr $r9, 14, $noreg
renamable $r7 = nsw t2SUBrr renamable $r8, renamable $r9, 14, $noreg, def $cpsr
tBcc %bb.7, 5, killed $cpsr
bb.5.for.inc16:
successors: %bb.6(0x7c000000), %bb.2(0x04000000)
liveins: $lr, $r0, $r1, $r3, $r5, $r8, $r9, $r10, $r12
renamable $r3, dead $cpsr = tADDi8 killed renamable $r3, 4, 14, $noreg
renamable $r5, dead $cpsr = tADDi8 killed renamable $r5, 4, 14, $noreg
renamable $r8 = nsw t2ADDri killed renamable $r8, 1, 14, $noreg, $noreg
renamable $lr = t2LoopDec killed renamable $lr, 1
t2LoopEnd renamable $lr, %bb.6, implicit-def dead $cpsr
tB %bb.2, 14, $noreg
bb.6.for.cond4.preheader:
successors: %bb.7(0x50000000), %bb.5(0x30000000)
liveins: $lr, $r0, $r1, $r3, $r5, $r8, $r9, $r10, $r12
renamable $r7 = nsw t2SUBrr renamable $r8, renamable $r9, 14, $noreg, def $cpsr
tBcc %bb.5, 4, killed $cpsr
bb.7.land.rhs.preheader:
successors: %bb.8(0x80000000)
liveins: $lr, $r0, $r1, $r3, $r5, $r7, $r8, $r9, $r10, $r12
renamable $r6, dead $cpsr = tMOVi8 0, 14, $noreg
bb.8.land.rhs:
successors: %bb.5(0x07e00000), %bb.8(0x78200000)
liveins: $lr, $r0, $r1, $r3, $r5, $r6, $r7, $r8, $r9, $r10, $r12
renamable $r4 = tLDRr renamable $r3, $r6, 14, $noreg :: (load (s32) from %ir.uglygep12)
renamable $r2 = tLDRr renamable $r5, $r6, 14, $noreg :: (load (s32) from %ir.uglygep34)
tCMPr renamable $r2, renamable $r4, 14, $noreg, implicit-def $cpsr
t2IT 12, 1, implicit-def $itstate
tSTRr killed renamable $r4, renamable $r5, $r6, 12, $cpsr, implicit $itstate :: (store (s32) into %ir.5)
tSTRr killed renamable $r2, renamable $r3, $r6, 12, $cpsr, implicit $itstate :: (store (s32) into %ir.uglygep6)
renamable $r6 = tADDhirr killed renamable $r6, renamable $r10, 12, $cpsr, implicit $r6, implicit $itstate
renamable $r7 = nsw t2SUBrr killed renamable $r7, renamable $r9, 12, $cpsr, $noreg, implicit $r7, implicit killed $itstate
t2IT 12, 8, implicit-def $itstate
t2CMPri renamable $r7, -1, 12, killed $cpsr, implicit-def $cpsr, implicit killed $itstate
tBcc %bb.8, 12, killed $cpsr
tB %bb.5, 14, $noreg
bb.9.for.end20:
$sp = t2LDMIA_RET $sp, 14, $noreg, def $r4, def $r5, def $r6, def $r7, def $r8, def $r9, def $r10, def $pc
...