llvm/test/CodeGen/Thumb2/LowOverheadLoops/branch-targets.ll

; RUN: llc -mtriple=thumbv8.1m.main -O0 -mattr=+lob -disable-arm-loloops=false -stop-before=arm-low-overhead-loops %s -o - | FileCheck %s --check-prefix=CHECK-MID
; RUN: llc -mtriple=thumbv8.1m.main -O0 -mattr=+lob -disable-arm-loloops=false -verify-machineinstrs %s -o - | FileCheck %s --check-prefix=CHECK-END

; Test that the branch targets are correct after isel, even though the loop
; will sometimes be reverted anyway.

; CHECK-MID: name: check_loop_dec_brcond_combine
; CHECK-MID: bb.2.for.body:
; CHECK-MID:   renamable $lr = t2LoopDec killed renamable $lr, 1
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2

; CHECK-END: .LBB0_1:
; CHECK-END:   b .LBB0_3
; CHECK-END: .LBB0_2:
; CHECK-END:   subs.w lr, lr, #1
; CHECK-END:   bne .LBB0_3
; CHECK-END:   b .LBB0_4
; CHECK-END: .LBB0_3:
; CHECK-END:   b .LBB0_2
define void @check_loop_dec_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp ne i32 %count.next, 0
  br i1 %cmp, label %for.header, label %for.cond.cleanup

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: name: check_loop_dec_ugt_brcond_combine
; CHECK-MID: bb.2.for.body:
; CHECK-MID:   renamable $lr = t2LoopDec killed renamable $lr, 1
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2
define void @check_loop_dec_ugt_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp ugt i32 %count.next, 0
  br i1 %cmp, label %for.header, label %for.cond.cleanup

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: name: check_loop_dec_ult_brcond_combine
; CHECK-MID: bb.2.for.body:
; CHECK-MID:   renamable $lr = t2LoopDec killed renamable $lr, 1
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2
define void @check_loop_dec_ult_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp ult i32 %count.next, 1
  br i1 %cmp, label %for.cond.cleanup, label %for.header

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: name: check_loop_dec_ult_xor_brcond_combine
; CHECK-MIO: bb.2.for.body:
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID:   tB %bb.4, 14
; CHECk-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2
define void @check_loop_dec_ult_xor_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp ult i32 %count.next, 1
  %negate = xor i1 %cmp, 1
  br i1 %negate, label %for.header, label %for.cond.cleanup

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: name: check_loop_dec_sgt_brcond_combine
; CHECK-MIO: bb.2.for.body:
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID:   tB %bb.4, 14
; CHECk-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2
define void @check_loop_dec_sgt_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp sgt i32 %count.next, 0
  br i1 %cmp, label %for.header, label %for.cond.cleanup

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: name: check_loop_dec_sge_brcond_combine
; CHECK-MIO: bb.2.for.body:
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID:   tB %bb.4, 14
; CHECk-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2
define void @check_loop_dec_sge_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp sge i32 %count.next, 1
  br i1 %cmp, label %for.header, label %for.cond.cleanup

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: name: check_loop_dec_sge_xor_brcond_combine
; CHECK-MIO: bb.2.for.body:
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID:   tB %bb.4, 14
; CHECk-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2
define void @check_loop_dec_sge_xor_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp sge i32 %count.next, 1
  %negated = xor i1 %cmp, 1
  br i1 %negated, label %for.cond.cleanup, label %for.header

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: name: check_loop_dec_uge_brcond_combine
; CHECK-MIO: bb.2.for.body:
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID:   tB %bb.4, 14
; CHECk-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2
define void @check_loop_dec_uge_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp uge i32 %count.next, 1
  br i1 %cmp, label %for.header, label %for.cond.cleanup

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: name: check_loop_dec_uge_xor_brcond_combine
; CHECK-MIO: bb.2.for.body:
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.3
; CHECK-MID:   tB %bb.4, 14
; CHECk-MID: bb.3.for.header:
; CHECK-MID:   tB %bb.2
define void @check_loop_dec_uge_xor_brcond_combine(i32* nocapture %a, i32* nocapture readonly %b, i32* nocapture readonly %c, i32 %N) {
entry:
  call void @llvm.set.loop.iterations.i32(i32 %N)
  br label %for.body.preheader
  
for.body.preheader:
  %scevgep = getelementptr i32, i32* %a, i32 -1
  %scevgep4 = getelementptr i32, i32* %c, i32 -1
  %scevgep8 = getelementptr i32, i32* %b, i32 -1
  br label %for.header
 
for.body:
  %scevgep11 = getelementptr i32, i32* %lsr.iv9, i32 1
  %ld1 = load i32, i32* %scevgep11, align 4
  %scevgep7 = getelementptr i32, i32* %lsr.iv5, i32 1
  %ld2 = load i32, i32* %scevgep7, align 4
  %mul = mul nsw i32 %ld2, %ld1
  %scevgep3 = getelementptr i32, i32* %lsr.iv1, i32 1
  store i32 %mul, i32* %scevgep3, align 4
  %scevgep2 = getelementptr i32, i32* %lsr.iv1, i32 1
  %scevgep6 = getelementptr i32, i32* %lsr.iv5, i32 1
  %scevgep10 = getelementptr i32, i32* %lsr.iv9, i32 1
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp uge i32 %count.next, 1
  %negated = xor i1 %cmp, 1
  br i1 %negated, label %for.cond.cleanup, label %for.header

for.header:
  %lsr.iv9 = phi i32* [ %scevgep8, %for.body.preheader ], [ %scevgep10, %for.body ]
  %lsr.iv5 = phi i32* [ %scevgep4, %for.body.preheader ], [ %scevgep6, %for.body ]
  %lsr.iv1 = phi i32* [ %scevgep, %for.body.preheader ], [ %scevgep2, %for.body ]
  %count = phi i32 [ %N, %for.body.preheader ], [ %count.next, %for.body ]
  br label %for.body

for.cond.cleanup:
  ret void
}

; CHECK-MID: check_negated_xor_wls
; CHECK-MID: t2WhileLoopStart killed renamable $r2, %bb.3
; CHECK-MID: tB %bb.1
; CHECK-MID: bb.1.while.body.preheader:
; CHECK-MID:   $lr = t2LoopDec killed renamable $lr, 1
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.2
; CHECk-MID:   tB %bb.3
; CHECK-MID: bb.3.while.end:
define void @check_negated_xor_wls(i16* nocapture %a, i16* nocapture readonly %b, i32 %N) {
entry:
  %wls = call i1 @llvm.test.set.loop.iterations.i32(i32 %N)
  %xor = xor i1 %wls, 1
  br i1 %xor, label %while.end, label %while.body.preheader
  
while.body.preheader:
  br label %while.body
  
while.body:
  %a.addr.06 = phi i16* [ %incdec.ptr1, %while.body ], [ %a, %while.body.preheader ]
  %b.addr.05 = phi i16* [ %incdec.ptr, %while.body ], [ %b, %while.body.preheader ]
  %count = phi i32 [ %N, %while.body.preheader ], [ %count.next, %while.body ]
  %incdec.ptr = getelementptr inbounds i16, i16* %b.addr.05, i32 1
  %ld.b = load i16, i16* %b.addr.05, align 2
  %incdec.ptr1 = getelementptr inbounds i16, i16* %a.addr.06, i32 1
  store i16 %ld.b, i16* %a.addr.06, align 2
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp ne i32 %count.next, 0
  br i1 %cmp, label %while.body, label %while.end
  
while.end:
  ret void
}

; CHECK-MID: check_negated_cmp_wls
; CHECK-MID: t2WhileLoopStart killed renamable $r2, %bb.3
; CHECK-MID: tB %bb.1
; CHECK-MID: bb.1.while.body.preheader:
; CHECK-MID:   $lr = t2LoopDec killed renamable $lr, 1
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.2
; CHECk-MID:   tB %bb.3
; CHECK-MID: bb.3.while.end:
define void @check_negated_cmp_wls(i16* nocapture %a, i16* nocapture readonly %b, i32 %N) {
entry:
  %wls = call i1 @llvm.test.set.loop.iterations.i32(i32 %N)
  %cmp = icmp ne i1 %wls, 1
  br i1 %cmp, label %while.end, label %while.body.preheader
  
while.body.preheader:
  br label %while.body
  
while.body:
  %a.addr.06 = phi i16* [ %incdec.ptr1, %while.body ], [ %a, %while.body.preheader ]
  %b.addr.05 = phi i16* [ %incdec.ptr, %while.body ], [ %b, %while.body.preheader ]
  %count = phi i32 [ %N, %while.body.preheader ], [ %count.next, %while.body ]
  %incdec.ptr = getelementptr inbounds i16, i16* %b.addr.05, i32 1
  %ld.b = load i16, i16* %b.addr.05, align 2
  %incdec.ptr1 = getelementptr inbounds i16, i16* %a.addr.06, i32 1
  store i16 %ld.b, i16* %a.addr.06, align 2
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp.1 = icmp ne i32 %count.next, 0
  br i1 %cmp.1, label %while.body, label %while.end
  
while.end:
  ret void
}

; CHECK-MID: check_negated_reordered_wls
; CHECK-MID: bb.1.while.body.preheader:
; CHECK-MID:   tB %bb.2
; CHECK-MID: bb.2.while.body:
; CHECK-MID:   t2LoopDec killed renamable $lr, 1
; CHECK-MID:   t2LoopEnd killed renamable $lr, %bb.2
; CHECK-MID:   tB %bb.4
; CHECK-MID: bb.3.while:
; CHECK-MID:   t2WhileLoopStart {{.*}}, %bb.4
; CHECK-MID: bb.4.while.end
define void @check_negated_reordered_wls(i16* nocapture %a, i16* nocapture readonly %b, i32 %N) {
entry:
  br label %while
  
while.body.preheader:
  br label %while.body
  
while.body:
  %a.addr.06 = phi i16* [ %incdec.ptr1, %while.body ], [ %a, %while.body.preheader ]
  %b.addr.05 = phi i16* [ %incdec.ptr, %while.body ], [ %b, %while.body.preheader ]
  %count = phi i32 [ %N, %while.body.preheader ], [ %count.next, %while.body ]
  %incdec.ptr = getelementptr inbounds i16, i16* %b.addr.05, i32 1
  %ld.b = load i16, i16* %b.addr.05, align 2
  %incdec.ptr1 = getelementptr inbounds i16, i16* %a.addr.06, i32 1
  store i16 %ld.b, i16* %a.addr.06, align 2
  %count.next = call i32 @llvm.loop.decrement.reg.i32.i32.i32(i32 %count, i32 1)
  %cmp = icmp ne i32 %count.next, 0
  br i1 %cmp, label %while.body, label %while.end

while:
  %wls = call i1 @llvm.test.set.loop.iterations.i32(i32 %N)
  %xor = xor i1 %wls, 1
  br i1 %xor, label %while.end, label %while.body.preheader

while.end:
  ret void
}

declare void @llvm.set.loop.iterations.i32(i32)
declare i1 @llvm.test.set.loop.iterations.i32(i32)
declare i32 @llvm.loop.decrement.reg.i32.i32.i32(i32, i32)