llvm/test/Transforms/LoopVectorize/if-conversion.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s  -loop-vectorize -force-vector-interleave=1 -force-vector-width=4 -enable-if-conversion -dce -instcombine -S | FileCheck %s

target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"

; This is the loop in this example:
;
;int function0(int *a, int *b, int start, int end) {
;
;  for (int i=start; i<end; ++i) {
;    unsigned k = a[i];
;
;    if (a[i] > b[i])   <------ notice the IF inside the loop.
;      k = k * 5 + 3;
;
;    a[i] = k;  <---- K is a phi node that becomes vector-select.
;  }
;}

define i32 @function0(i32* nocapture %a, i32* nocapture %b, i32 %start, i32 %end) nounwind uwtable ssp {
; CHECK-LABEL: @function0(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP16:%.*]] = icmp slt i32 [[START:%.*]], [[END:%.*]]
; CHECK-NEXT:    br i1 [[CMP16]], label [[FOR_BODY_LR_PH:%.*]], label [[FOR_END:%.*]]
; CHECK:       for.body.lr.ph:
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[START]] to i64
; CHECK-NEXT:    [[TMP1:%.*]] = add i32 [[END]], -1
; CHECK-NEXT:    [[TMP2:%.*]] = sub i32 [[TMP1]], [[START]]
; CHECK-NEXT:    [[TMP3:%.*]] = zext i32 [[TMP2]] to i64
; CHECK-NEXT:    [[TMP4:%.*]] = add nuw nsw i64 [[TMP3]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP4]], 4
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[MIN_ITERS_CHECKED:%.*]]
; CHECK:       min.iters.checked:
; CHECK-NEXT:    [[TMP5:%.*]] = add i32 [[TMP2]], 1
; CHECK-NEXT:    [[TMP6:%.*]] = and i32 [[TMP5]], 3
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = zext i32 [[TMP6]] to i64
; CHECK-NEXT:    [[N_VEC:%.*]] = sub nsw i64 [[TMP4]], [[N_MOD_VF]]
; CHECK-NEXT:    [[CMP_ZERO:%.*]] = icmp eq i64 [[N_VEC]], 0
; CHECK-NEXT:    br i1 [[CMP_ZERO]], label [[SCALAR_PH]], label [[VECTOR_MEMCHECK:%.*]]
; CHECK:       vector.memcheck:
; CHECK-NEXT:    [[SCEVGEP:%.*]] = getelementptr i32, i32* [[A:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[TMP7:%.*]] = add i32 [[END]], -1
; CHECK-NEXT:    [[TMP8:%.*]] = sub i32 [[TMP7]], [[START]]
; CHECK-NEXT:    [[TMP9:%.*]] = zext i32 [[TMP8]] to i64
; CHECK-NEXT:    [[TMP10:%.*]] = add nsw i64 [[TMP0]], [[TMP9]]
; CHECK-NEXT:    [[TMP11:%.*]] = add nsw i64 [[TMP10]], 1
; CHECK-NEXT:    [[SCEVGEP2:%.*]] = getelementptr i32, i32* [[A]], i64 [[TMP11]]
; CHECK-NEXT:    [[SCEVGEP4:%.*]] = getelementptr i32, i32* [[B:%.*]], i64 [[TMP0]]
; CHECK-NEXT:    [[SCEVGEP6:%.*]] = getelementptr i32, i32* [[B]], i64 [[TMP11]]
; CHECK-NEXT:    [[BOUND0:%.*]] = icmp ult i32* [[SCEVGEP]], [[SCEVGEP6]]
; CHECK-NEXT:    [[BOUND1:%.*]] = icmp ult i32* [[SCEVGEP4]], [[SCEVGEP2]]
; CHECK-NEXT:    [[MEMCHECK_CONFLICT:%.*]] = and i1 [[BOUND0]], [[BOUND1]]
; CHECK-NEXT:    [[IND_END:%.*]] = add nsw i64 [[N_VEC]], [[TMP0]]
; CHECK-NEXT:    br i1 [[MEMCHECK_CONFLICT]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP12:%.*]] = add i64 [[INDEX]], [[TMP0]]
; CHECK-NEXT:    [[TMP13:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[TMP12]]
; CHECK-NEXT:    [[TMP14:%.*]] = bitcast i32* [[TMP13]] to <4 x i32>*
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, <4 x i32>* [[TMP14]], align 4, !alias.scope !0, !noalias !3
; CHECK-NEXT:    [[TMP15:%.*]] = getelementptr inbounds i32, i32* [[B]], i64 [[TMP12]]
; CHECK-NEXT:    [[TMP16:%.*]] = bitcast i32* [[TMP15]] to <4 x i32>*
; CHECK-NEXT:    [[WIDE_LOAD8:%.*]] = load <4 x i32>, <4 x i32>* [[TMP16]], align 4, !alias.scope !3
; CHECK-NEXT:    [[TMP17:%.*]] = mul <4 x i32> [[WIDE_LOAD]], <i32 5, i32 5, i32 5, i32 5>
; CHECK-NEXT:    [[TMP18:%.*]] = add <4 x i32> [[TMP17]], <i32 3, i32 3, i32 3, i32 3>
; CHECK-NEXT:    [[TMP19:%.*]] = icmp sgt <4 x i32> [[WIDE_LOAD]], [[WIDE_LOAD8]]
; CHECK-NEXT:    [[PREDPHI:%.*]] = select <4 x i1> [[TMP19]], <4 x i32> [[TMP18]], <4 x i32> [[WIDE_LOAD]]
; CHECK-NEXT:    [[TMP20:%.*]] = bitcast i32* [[TMP13]] to <4 x i32>*
; CHECK-NEXT:    store <4 x i32> [[PREDPHI]], <4 x i32>* [[TMP20]], align 4, !alias.scope !0, !noalias !3
; CHECK-NEXT:    [[INDEX_NEXT]] = add i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP21:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP21]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop !5
; CHECK:       middle.block:
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[TMP6]], 0
; CHECK-NEXT:    br i1 [[CMP_N]], label [[FOR_END_LOOPEXIT:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[IND_END]], [[MIDDLE_BLOCK]] ], [ [[TMP0]], [[FOR_BODY_LR_PH]] ], [ [[TMP0]], [[MIN_ITERS_CHECKED]] ], [ [[TMP0]], [[VECTOR_MEMCHECK]] ]
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ], [ [[INDVARS_IV_NEXT:%.*]], [[IF_END:%.*]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[TMP22:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT:    [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, i32* [[B]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[TMP23:%.*]] = load i32, i32* [[ARRAYIDX4]], align 4
; CHECK-NEXT:    [[CMP5:%.*]] = icmp sgt i32 [[TMP22]], [[TMP23]]
; CHECK-NEXT:    br i1 [[CMP5]], label [[IF_THEN:%.*]], label [[IF_END]]
; CHECK:       if.then:
; CHECK-NEXT:    [[MUL:%.*]] = mul i32 [[TMP22]], 5
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[MUL]], 3
; CHECK-NEXT:    br label [[IF_END]]
; CHECK:       if.end:
; CHECK-NEXT:    [[K_0:%.*]] = phi i32 [ [[ADD]], [[IF_THEN]] ], [ [[TMP22]], [[FOR_BODY]] ]
; CHECK-NEXT:    store i32 [[K_0]], i32* [[ARRAYIDX]], align 4
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[TMP24:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[TMP24]], [[END]]
; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END_LOOPEXIT]], !llvm.loop !8
; CHECK:       for.end.loopexit:
; CHECK-NEXT:    br label [[FOR_END]]
; CHECK:       for.end:
; CHECK-NEXT:    ret i32 undef
;
entry:
  %cmp16 = icmp slt i32 %start, %end
  br i1 %cmp16, label %for.body.lr.ph, label %for.end

for.body.lr.ph:
  %0 = sext i32 %start to i64
  br label %for.body

for.body:
  %indvars.iv = phi i64 [ %0, %for.body.lr.ph ], [ %indvars.iv.next, %if.end ]
  %arrayidx = getelementptr inbounds i32, i32* %a, i64 %indvars.iv
  %1 = load i32, i32* %arrayidx, align 4
  %arrayidx4 = getelementptr inbounds i32, i32* %b, i64 %indvars.iv
  %2 = load i32, i32* %arrayidx4, align 4
  %cmp5 = icmp sgt i32 %1, %2
  br i1 %cmp5, label %if.then, label %if.end

if.then:
  %mul = mul i32 %1, 5
  %add = add i32 %mul, 3
  br label %if.end

if.end:
  %k.0 = phi i32 [ %add, %if.then ], [ %1, %for.body ]
  store i32 %k.0, i32* %arrayidx, align 4
  %indvars.iv.next = add i64 %indvars.iv, 1
  %3 = trunc i64 %indvars.iv.next to i32
  %cmp = icmp slt i32 %3, %end
  br i1 %cmp, label %for.body, label %for.end

for.end:
  ret i32 undef
}



; int func(int *A, int n) {
;   unsigned sum = 0;
;   for (int i = 0; i < n; ++i)
;     if (A[i] > 30)
;       sum += A[i] + 2;
;
;   return sum;
; }

define i32 @reduction_func(i32* nocapture %A, i32 %n) nounwind uwtable readonly ssp {
; CHECK-LABEL: @reduction_func(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[CMP10:%.*]] = icmp sgt i32 [[N:%.*]], 0
; CHECK-NEXT:    br i1 [[CMP10]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    [[TMP0:%.*]] = add i32 [[N]], -1
; CHECK-NEXT:    [[TMP1:%.*]] = zext i32 [[TMP0]] to i64
; CHECK-NEXT:    [[TMP2:%.*]] = add nuw nsw i64 [[TMP1]], 1
; CHECK-NEXT:    [[MIN_ITERS_CHECK:%.*]] = icmp ult i64 [[TMP2]], 4
; CHECK-NEXT:    br i1 [[MIN_ITERS_CHECK]], label [[SCALAR_PH:%.*]], label [[MIN_ITERS_CHECKED:%.*]]
; CHECK:       min.iters.checked:
; CHECK-NEXT:    [[TMP3:%.*]] = and i32 [[N]], 3
; CHECK-NEXT:    [[N_MOD_VF:%.*]] = zext i32 [[TMP3]] to i64
; CHECK-NEXT:    [[N_VEC:%.*]] = sub nsw i64 [[TMP2]], [[N_MOD_VF]]
; CHECK-NEXT:    [[CMP_ZERO:%.*]] = icmp eq i64 [[N_VEC]], 0
; CHECK-NEXT:    br i1 [[CMP_ZERO]], label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[VEC_PHI:%.*]] = phi <4 x i32> [ zeroinitializer, [[VECTOR_PH]] ], [ [[PREDPHI:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[TMP4:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i64 [[INDEX]]
; CHECK-NEXT:    [[TMP5:%.*]] = bitcast i32* [[TMP4]] to <4 x i32>*
; CHECK-NEXT:    [[WIDE_LOAD:%.*]] = load <4 x i32>, <4 x i32>* [[TMP5]], align 4
; CHECK-NEXT:    [[TMP6:%.*]] = add <4 x i32> [[VEC_PHI]], <i32 2, i32 2, i32 2, i32 2>
; CHECK-NEXT:    [[TMP7:%.*]] = add <4 x i32> [[TMP6]], [[WIDE_LOAD]]
; CHECK-NEXT:    [[TMP8:%.*]] = icmp slt <4 x i32> [[WIDE_LOAD]], <i32 31, i32 31, i32 31, i32 31>
; CHECK-NEXT:    [[PREDPHI]] = select <4 x i1> [[TMP8]], <4 x i32> [[VEC_PHI]], <4 x i32> [[TMP7]]
; CHECK-NEXT:    [[INDEX_NEXT]] = add i64 [[INDEX]], 4
; CHECK-NEXT:    [[TMP9:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT:    br i1 [[TMP9]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop !9
; CHECK:       middle.block:
; CHECK-NEXT:    [[RDX_SHUF:%.*]] = shufflevector <4 x i32> [[PREDPHI]], <4 x i32> undef, <4 x i32> <i32 2, i32 3, i32 undef, i32 undef>
; CHECK-NEXT:    [[BIN_RDX:%.*]] = add <4 x i32> [[PREDPHI]], [[RDX_SHUF]]
; CHECK-NEXT:    [[RDX_SHUF1:%.*]] = shufflevector <4 x i32> [[BIN_RDX]], <4 x i32> undef, <4 x i32> <i32 1, i32 undef, i32 undef, i32 undef>
; CHECK-NEXT:    [[BIN_RDX2:%.*]] = add <4 x i32> [[BIN_RDX]], [[RDX_SHUF1]]
; CHECK-NEXT:    [[TMP10:%.*]] = extractelement <4 x i32> [[BIN_RDX2]], i32 0
; CHECK-NEXT:    [[CMP_N:%.*]] = icmp eq i32 [[TMP3]], 0
; CHECK-NEXT:    br i1 [[CMP_N]], label [[FOR_END_LOOPEXIT:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    [[BC_RESUME_VAL:%.*]] = phi i64 [ [[N_VEC]], [[MIDDLE_BLOCK]] ], [ 0, [[FOR_BODY_PREHEADER]] ], [ 0, [[MIN_ITERS_CHECKED]] ]
; CHECK-NEXT:    [[BC_MERGE_RDX:%.*]] = phi i32 [ [[TMP10]], [[MIDDLE_BLOCK]] ], [ 0, [[FOR_BODY_PREHEADER]] ], [ 0, [[MIN_ITERS_CHECKED]] ]
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[FOR_INC:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; CHECK-NEXT:    [[SUM_011:%.*]] = phi i32 [ [[SUM_1:%.*]], [[FOR_INC]] ], [ [[BC_MERGE_RDX]], [[SCALAR_PH]] ]
; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[A]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[TMP11:%.*]] = load i32, i32* [[ARRAYIDX]], align 4
; CHECK-NEXT:    [[CMP1:%.*]] = icmp sgt i32 [[TMP11]], 30
; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN:%.*]], label [[FOR_INC]]
; CHECK:       if.then:
; CHECK-NEXT:    [[ADD:%.*]] = add i32 [[SUM_011]], 2
; CHECK-NEXT:    [[ADD4:%.*]] = add i32 [[ADD]], [[TMP11]]
; CHECK-NEXT:    br label [[FOR_INC]]
; CHECK:       for.inc:
; CHECK-NEXT:    [[SUM_1]] = phi i32 [ [[ADD4]], [[IF_THEN]] ], [ [[SUM_011]], [[FOR_BODY]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[LFTR_WIDEIV:%.*]] = trunc i64 [[INDVARS_IV_NEXT]] to i32
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp eq i32 [[LFTR_WIDEIV]], [[N]]
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[FOR_END_LOOPEXIT]], label [[FOR_BODY]], !llvm.loop !10
; CHECK:       for.end.loopexit:
; CHECK-NEXT:    [[SUM_1_LCSSA:%.*]] = phi i32 [ [[SUM_1]], [[FOR_INC]] ], [ [[TMP10]], [[MIDDLE_BLOCK]] ]
; CHECK-NEXT:    br label [[FOR_END]]
; CHECK:       for.end:
; CHECK-NEXT:    [[SUM_0_LCSSA:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[SUM_1_LCSSA]], [[FOR_END_LOOPEXIT]] ]
; CHECK-NEXT:    ret i32 [[SUM_0_LCSSA]]
;
entry:
  %cmp10 = icmp sgt i32 %n, 0
  br i1 %cmp10, label %for.body, label %for.end

for.body:                                         ; preds = %entry, %for.inc
  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
  %sum.011 = phi i32 [ %sum.1, %for.inc ], [ 0, %entry ]
  %arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
  %0 = load i32, i32* %arrayidx, align 4
  %cmp1 = icmp sgt i32 %0, 30
  br i1 %cmp1, label %if.then, label %for.inc

if.then:                                          ; preds = %for.body
  %add = add i32 %sum.011, 2
  %add4 = add i32 %add, %0
  br label %for.inc

for.inc:                                          ; preds = %for.body, %if.then
  %sum.1 = phi i32 [ %add4, %if.then ], [ %sum.011, %for.body ]
  %indvars.iv.next = add i64 %indvars.iv, 1
  %lftr.wideiv = trunc i64 %indvars.iv.next to i32
  %exitcond = icmp eq i32 %lftr.wideiv, %n
  br i1 %exitcond, label %for.end, label %for.body

for.end:                                          ; preds = %for.inc, %entry
  %sum.0.lcssa = phi i32 [ 0, %entry ], [ %sum.1, %for.inc ]
  ret i32 %sum.0.lcssa
}

@a = common global [1 x i32*] zeroinitializer, align 8
@c = common global i32* null, align 8

; We use to if convert this loop. This is not safe because there is a trapping
; constant expression.
; PR16729

define i32 @trapping_constant_expression() {
; CHECK-LABEL: @trapping_constant_expression(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 false, label [[SCALAR_PH:%.*]], label [[MIN_ITERS_CHECKED:%.*]]
; CHECK:       min.iters.checked:
; CHECK-NEXT:    br i1 false, label [[SCALAR_PH]], label [[VECTOR_PH:%.*]]
; CHECK:       vector.ph:
; CHECK-NEXT:    br label [[VECTOR_BODY:%.*]]
; CHECK:       vector.body:
; CHECK-NEXT:    [[INDEX:%.*]] = phi i32 [ 0, [[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], [[VECTOR_BODY]] ]
; CHECK-NEXT:    [[INDEX_NEXT]] = add i32 [[INDEX]], 4
; CHECK-NEXT:    [[TMP0:%.*]] = icmp eq i32 [[INDEX_NEXT]], 128
; CHECK-NEXT:    br i1 [[TMP0]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop !12
; CHECK:       middle.block:
; CHECK-NEXT:    br i1 true, label [[FOR_END:%.*]], label [[SCALAR_PH]]
; CHECK:       scalar.ph:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    br i1 false, label [[COND_FALSE:%.*]], label [[COND_END:%.*]]
; CHECK:       cond.false:
; CHECK-NEXT:    br label [[COND_END]]
; CHECK:       cond.end:
; CHECK-NEXT:    br i1 undef, label [[FOR_BODY]], label [[FOR_END]], !llvm.loop !13
; CHECK:       for.end:
; CHECK-NEXT:    ret i32 0
;
entry:
  br label %for.body

for.body:
  %inc3 = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
  %or2 = phi i32 [ 0, %entry ], [ %or, %cond.end ]
  br i1 icmp eq (i32** getelementptr inbounds ([1 x i32*], [1 x i32*]* @a, i64 0, i64 0), i32** @c), label %cond.false, label %cond.end

cond.false:
  br label %cond.end

cond.end:
  %cond = phi i32 [ sdiv (i32 1, i32 zext (i1 icmp eq (i32** getelementptr inbounds ([1 x i32*], [1 x i32*]* @a, i64 0, i64 0), i32** @c) to i32)), %cond.false ], [ 0, %for.body ]
  %or = or i32 %or2, %cond
  %inc = add nsw i32 %inc3, 1
  %cmp = icmp slt i32 %inc, 128
  br i1 %cmp, label %for.body, label %for.end

for.end:
  ret i32 %or
}

; Neither should we if-convert if there is an instruction operand that is a
; trapping constant expression.
; PR16729

define i32 @trapping_constant_expression2() {
; CHECK-LABEL: @trapping_constant_expression2(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INC3:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[INC:%.*]], [[COND_END:%.*]] ]
; CHECK-NEXT:    [[OR2:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[OR:%.*]], [[COND_END]] ]
; CHECK-NEXT:    br i1 false, label [[COND_FALSE:%.*]], label [[COND_END]]
; CHECK:       cond.false:
; CHECK-NEXT:    br label [[COND_END]]
; CHECK:       cond.end:
; CHECK-NEXT:    [[OR]] = or i32 [[OR2]], [[INC3]]
; CHECK-NEXT:    [[INC]] = add nsw i32 [[INC3]], 1
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 [[INC3]], 127
; CHECK-NEXT:    br i1 [[CMP]], label [[FOR_BODY]], label [[FOR_END:%.*]]
; CHECK:       for.end:
; CHECK-NEXT:    ret i32 [[OR]]
;
entry:
  br label %for.body

for.body:
  %inc3 = phi i32 [ 0, %entry ], [ %inc, %cond.end ]
  %or2 = phi i32 [ 0, %entry ], [ %or, %cond.end ]
  br i1 icmp eq (i32** getelementptr inbounds ([1 x i32*], [1 x i32*]* @a, i64 0, i64 0), i32** @c), label %cond.false, label %cond.end

cond.false:
  %cond.1 = or i32 %inc3, sdiv (i32 1, i32 zext (i1 icmp eq (i32** getelementptr inbounds ([1 x i32*], [1 x i32*]* @a, i64 0, i64 1), i32** @c) to i32))
  br label %cond.end

cond.end:
  %cond = phi i32 [ %cond.1, %cond.false ], [ %inc3, %for.body ]
  %or = or i32 %or2, %cond
  %inc = add nsw i32 %inc3, 1
  %cmp = icmp slt i32 %inc, 128
  br i1 %cmp, label %for.body, label %for.end

for.end:
  ret i32 %or
}