test/Transforms/IndVarSimplify/no-iv-rewrite.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -indvars -S -indvars-predicate-loops=0  | FileCheck %s
;
; Make sure that indvars isn't inserting canonical IVs.
; This is kinda hard to do until linear function test replacement is removed.

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"

; We should only have 2 IVs.
; sext should be eliminated while preserving gep inboundsness.
define i32 @sum(i32* %arr, i32 %n) nounwind {
; CHECK-LABEL: @sum(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[PRECOND:%.*]] = icmp slt i32 0, [[N:%.*]]
; CHECK-NEXT:    br i1 [[PRECOND]], label [[PH:%.*]], label [[RETURN:%.*]]
; CHECK:       ph:
; CHECK-NEXT:    [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[N]] to i64
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[PH]] ]
; CHECK-NEXT:    [[S_01:%.*]] = phi i32 [ 0, [[PH]] ], [ [[SINC:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[ADR:%.*]] = getelementptr inbounds i32, i32* [[ARR:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[VAL:%.*]] = load i32, i32* [[ADR]], align 4
; CHECK-NEXT:    [[SINC]] = add nsw i32 [[S_01]], [[VAL]]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[S_LCSSA:%.*]] = phi i32 [ [[SINC]], [[LOOP]] ]
; CHECK-NEXT:    br label [[RETURN]]
; CHECK:       return:
; CHECK-NEXT:    [[S_0_LCSSA:%.*]] = phi i32 [ [[S_LCSSA]], [[EXIT]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i32 [[S_0_LCSSA]]
;
entry:
  %precond = icmp slt i32 0, %n
  br i1 %precond, label %ph, label %return

ph:
  br label %loop

loop:
  %i.02 = phi i32 [ 0, %ph ], [ %iinc, %loop ]
  %s.01 = phi i32 [ 0, %ph ], [ %sinc, %loop ]
  %ofs = sext i32 %i.02 to i64
  %adr = getelementptr inbounds i32, i32* %arr, i64 %ofs
  %val = load i32, i32* %adr
  %sinc = add nsw i32 %s.01, %val
  %iinc = add nsw i32 %i.02, 1
  %cond = icmp slt i32 %iinc, %n
  br i1 %cond, label %loop, label %exit

exit:
  %s.lcssa = phi i32 [ %sinc, %loop ]
  br label %return

return:
  %s.0.lcssa = phi i32 [ %s.lcssa, %exit ], [ 0, %entry ]
  ret i32 %s.0.lcssa
}

; We should only have 2 IVs.
; %ofs sext should be eliminated while preserving gep inboundsness.
; %vall sext should obviously not be eliminated
define i64 @suml(i32* %arr, i32 %n) nounwind {
; CHECK-LABEL: @suml(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[PRECOND:%.*]] = icmp slt i32 0, [[N:%.*]]
; CHECK-NEXT:    br i1 [[PRECOND]], label [[PH:%.*]], label [[RETURN:%.*]]
; CHECK:       ph:
; CHECK-NEXT:    [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[N]] to i64
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[PH]] ]
; CHECK-NEXT:    [[S_01:%.*]] = phi i64 [ 0, [[PH]] ], [ [[SINC:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[ADR:%.*]] = getelementptr inbounds i32, i32* [[ARR:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[VAL:%.*]] = load i32, i32* [[ADR]], align 4
; CHECK-NEXT:    [[VALL:%.*]] = sext i32 [[VAL]] to i64
; CHECK-NEXT:    [[SINC]] = add nsw i64 [[S_01]], [[VALL]]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[S_LCSSA:%.*]] = phi i64 [ [[SINC]], [[LOOP]] ]
; CHECK-NEXT:    br label [[RETURN]]
; CHECK:       return:
; CHECK-NEXT:    [[S_0_LCSSA:%.*]] = phi i64 [ [[S_LCSSA]], [[EXIT]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    ret i64 [[S_0_LCSSA]]
;
entry:
  %precond = icmp slt i32 0, %n
  br i1 %precond, label %ph, label %return

ph:
  br label %loop

loop:
  %i.02 = phi i32 [ 0, %ph ], [ %iinc, %loop ]
  %s.01 = phi i64 [ 0, %ph ], [ %sinc, %loop ]
  %ofs = sext i32 %i.02 to i64
  %adr = getelementptr inbounds i32, i32* %arr, i64 %ofs
  %val = load i32, i32* %adr
  %vall = sext i32 %val to i64
  %sinc = add nsw i64 %s.01, %vall
  %iinc = add nsw i32 %i.02, 1
  %cond = icmp slt i32 %iinc, %n
  br i1 %cond, label %loop, label %exit

exit:
  %s.lcssa = phi i64 [ %sinc, %loop ]
  br label %return

return:
  %s.0.lcssa = phi i64 [ %s.lcssa, %exit ], [ 0, %entry ]
  ret i64 %s.0.lcssa
}

; It's not indvars' job to perform LICM on %ofs
; Preserve exactly one pointer type IV.
; Don't create any extra adds.
; Preserve gep inboundsness, and don't factor it.
define void @outofbounds(i32* %first, i32* %last, i32 %idx) nounwind {
; CHECK-LABEL: @outofbounds(
; CHECK-NEXT:    [[PRECOND:%.*]] = icmp ne i32* [[FIRST:%.*]], [[LAST:%.*]]
; CHECK-NEXT:    br i1 [[PRECOND]], label [[PH:%.*]], label [[RETURN:%.*]]
; CHECK:       ph:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[PTRIV:%.*]] = phi i32* [ [[FIRST]], [[PH]] ], [ [[PTRPOST:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[OFS:%.*]] = sext i32 [[IDX:%.*]] to i64
; CHECK-NEXT:    [[ADR:%.*]] = getelementptr inbounds i32, i32* [[PTRIV]], i64 [[OFS]]
; CHECK-NEXT:    store i32 3, i32* [[ADR]], align 4
; CHECK-NEXT:    [[PTRPOST]] = getelementptr inbounds i32, i32* [[PTRIV]], i32 1
; CHECK-NEXT:    [[COND:%.*]] = icmp ne i32* [[PTRPOST]], [[LAST]]
; CHECK-NEXT:    br i1 [[COND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    br label [[RETURN]]
; CHECK:       return:
; CHECK-NEXT:    ret void
;
  %precond = icmp ne i32* %first, %last
  br i1 %precond, label %ph, label %return

ph:
  br label %loop

loop:
  %ptriv = phi i32* [ %first, %ph ], [ %ptrpost, %loop ]
  %ofs = sext i32 %idx to i64
  %adr = getelementptr inbounds i32, i32* %ptriv, i64 %ofs
  store i32 3, i32* %adr
  %ptrpost = getelementptr inbounds i32, i32* %ptriv, i32 1
  %cond = icmp ne i32* %ptrpost, %last
  br i1 %cond, label %loop, label %exit

exit:
  br label %return

return:
  ret void
}

%structI = type { i32 }

; Preserve casts
define void @bitcastiv(i32 %start, i32 %limit, i32 %step, %structI* %base)
; CHECK-LABEL: @bitcastiv(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[P:%.*]] = phi %structI* [ [[BASE:%.*]], [[ENTRY]] ], [ [[PINC:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[ADR:%.*]] = getelementptr [[STRUCTI:%.*]], %structI* [[P]], i32 0, i32 0
; CHECK-NEXT:    store i32 3, i32* [[ADR]], align 4
; CHECK-NEXT:    [[PP:%.*]] = bitcast %structI* [[P]] to i32*
; CHECK-NEXT:    store i32 4, i32* [[PP]], align 4
; CHECK-NEXT:    [[PINC]] = getelementptr [[STRUCTI]], %structI* [[P]], i32 1
; CHECK-NEXT:    [[NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    [[COND:%.*]] = icmp ne i32 [[NEXT]], [[LIMIT:%.*]]
; CHECK-NEXT:    br i1 [[COND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
nounwind
{
entry:
  br label %loop

loop:
  %iv = phi i32 [%start, %entry], [%next, %loop]
  %p = phi %structI* [%base, %entry], [%pinc, %loop]
  %adr = getelementptr %structI, %structI* %p, i32 0, i32 0
  store i32 3, i32* %adr
  %pp = bitcast %structI* %p to i32*
  store i32 4, i32* %pp
  %pinc = getelementptr %structI, %structI* %p, i32 1
  %next = add i32 %iv, 1
  %cond = icmp ne i32 %next, %limit
  br i1 %cond, label %loop, label %exit

exit:
  ret void
}

; Test inserting a truncate at a phi use.
define void @maxvisitor(i32 %limit, i32* %base) nounwind {
; CHECK-LABEL: @maxvisitor(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[TMP0:%.*]] = icmp sgt i32 [[LIMIT:%.*]], 1
; CHECK-NEXT:    [[SMAX:%.*]] = select i1 [[TMP0]], i32 [[LIMIT]], i32 1
; CHECK-NEXT:    [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[SMAX]] to i64
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP_INC:%.*]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[MAX:%.*]] = phi i32 [ 0, [[ENTRY]] ], [ [[MAX_NEXT:%.*]], [[LOOP_INC]] ]
; CHECK-NEXT:    [[ADR:%.*]] = getelementptr inbounds i32, i32* [[BASE:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[VAL:%.*]] = load i32, i32* [[ADR]], align 4
; CHECK-NEXT:    [[CMP19:%.*]] = icmp sgt i32 [[VAL]], [[MAX]]
; CHECK-NEXT:    br i1 [[CMP19]], label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK:       if.then:
; CHECK-NEXT:    [[TMP1:%.*]] = trunc i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    br label [[LOOP_INC]]
; CHECK:       if.else:
; CHECK-NEXT:    br label [[LOOP_INC]]
; CHECK:       loop.inc:
; CHECK-NEXT:    [[MAX_NEXT]] = phi i32 [ [[TMP1]], [[IF_THEN]] ], [ [[MAX]], [[IF_ELSE]] ]
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[EXITCOND:%.*]] = icmp ne i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
; CHECK-NEXT:    br i1 [[EXITCOND]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop

loop:
  %idx = phi i32 [ 0, %entry ], [ %idx.next, %loop.inc ]
  %max = phi i32 [ 0, %entry ], [ %max.next, %loop.inc ]
  %idxprom = sext i32 %idx to i64
  %adr = getelementptr inbounds i32, i32* %base, i64 %idxprom
  %val = load i32, i32* %adr
  %cmp19 = icmp sgt i32 %val, %max
  br i1 %cmp19, label %if.then, label %if.else

if.then:
  br label %loop.inc

if.else:
  br label %loop.inc

loop.inc:
  %max.next = phi i32 [ %idx, %if.then ], [ %max, %if.else ]
  %idx.next = add nsw i32 %idx, 1
  %cmp = icmp slt i32 %idx.next, %limit
  br i1 %cmp, label %loop, label %exit

exit:
  ret void
}

; Test an edge case of removing an identity phi that directly feeds
; back to the loop iv.
define void @identityphi(i32 %limit) nounwind {
; CHECK-LABEL: @identityphi(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    br i1 undef, label [[IF_THEN:%.*]], label [[CONTROL:%.*]]
; CHECK:       if.then:
; CHECK-NEXT:    br label [[CONTROL]]
; CHECK:       control:
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i32 0, [[LIMIT:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry], [ %iv.next, %control ]
  br i1 undef, label %if.then, label %control

if.then:
  br label %control

control:
  %iv.next = phi i32 [ %iv, %loop ], [ undef, %if.then ]
  %cmp = icmp slt i32 %iv.next, %limit
  br i1 %cmp, label %loop, label %exit

exit:
  ret void
}

; Test cloning an or, which is not an OverflowBinaryOperator.
define i64 @cloneOr(i32 %limit, i64* %base) nounwind {
; CHECK-LABEL: @cloneOr(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[HALFLIM:%.*]] = ashr i32 [[LIMIT:%.*]], 2
; CHECK-NEXT:    [[TMP0:%.*]] = sext i32 [[HALFLIM]] to i64
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ [[INDVARS_IV_NEXT:%.*]], [[LOOP]] ], [ 0, [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[ADR:%.*]] = getelementptr i64, i64* [[BASE:%.*]], i64 [[INDVARS_IV]]
; CHECK-NEXT:    [[VAL:%.*]] = load i64, i64* [[ADR]], align 8
; CHECK-NEXT:    [[TMP1:%.*]] = or i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 2
; CHECK-NEXT:    [[CMP:%.*]] = icmp slt i64 [[INDVARS_IV_NEXT]], [[TMP0]]
; CHECK-NEXT:    br i1 [[CMP]], label [[LOOP]], label [[EXIT:%.*]]
; CHECK:       exit:
; CHECK-NEXT:    [[VAL_LCSSA:%.*]] = phi i64 [ [[VAL]], [[LOOP]] ]
; CHECK-NEXT:    [[T3_LCSSA:%.*]] = phi i64 [ [[TMP1]], [[LOOP]] ]
; CHECK-NEXT:    [[RESULT:%.*]] = and i64 [[VAL_LCSSA]], [[T3_LCSSA]]
; CHECK-NEXT:    ret i64 [[RESULT]]
;
entry:
  ; ensure that the loop can't overflow
  %halfLim = ashr i32 %limit, 2
  br label %loop

loop:
  %iv = phi i32 [ 0, %entry], [ %iv.next, %loop ]
  %t1 = sext i32 %iv to i64
  %adr = getelementptr i64, i64* %base, i64 %t1
  %val = load i64, i64* %adr
  %t2 = or i32 %iv, 1
  %t3 = sext i32 %t2 to i64
  %iv.next = add i32 %iv, 2
  %cmp = icmp slt i32 %iv.next, %halfLim
  br i1 %cmp, label %loop, label %exit

exit:
  %result = and i64 %val, %t3
  ret i64 %result
}

; The i induction variable looks like a wrap-around, but it really is just
; a simple affine IV.  Make sure that indvars simplifies through.
; ReplaceLoopExitValue should fold the return value to constant 9.
define i32 @indirectRecurrence() nounwind {
; CHECK-LABEL: @indirectRecurrence(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[J_0:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[J_NEXT:%.*]], [[COND_TRUE:%.*]] ]
; CHECK-NEXT:    [[TMP:%.*]] = icmp ne i32 [[J_0]], 10
; CHECK-NEXT:    br i1 [[TMP]], label [[COND_TRUE]], label [[RETURN:%.*]]
; CHECK:       cond_true:
; CHECK-NEXT:    [[J_NEXT]] = add nuw nsw i32 [[J_0]], 1
; CHECK-NEXT:    br label [[LOOP]]
; CHECK:       return:
; CHECK-NEXT:    ret i32 9
;
entry:
  br label %loop

loop:
  %j.0 = phi i32 [ 1, %entry ], [ %j.next, %cond_true ]
  %i.0 = phi i32 [ 0, %entry ], [ %j.0, %cond_true ]
  %tmp = icmp ne i32 %j.0, 10
  br i1 %tmp, label %cond_true, label %return

cond_true:
  %j.next = add i32 %j.0, 1
  br label %loop

return:
  ret i32 %i.0
}

; Eliminate the congruent phis j, k, and l.
; Eliminate the redundant IV increments k.next and l.next.
; Two phis should remain, one starting at %init, and one at %init1.
; Two increments should remain, one by %step and one by %step1.
; Five live-outs should remain.
define i32 @isomorphic(i32 %init, i32 %step, i32 %lim) nounwind {
; CHECK-LABEL: @isomorphic(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[STEP1:%.*]] = add i32 [[STEP:%.*]], 1
; CHECK-NEXT:    [[INIT1:%.*]] = add i32 [[INIT:%.*]], [[STEP1]]
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[II:%.*]] = phi i32 [ [[INIT1]], [[ENTRY:%.*]] ], [ [[II_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[J:%.*]] = phi i32 [ [[INIT]], [[ENTRY]] ], [ [[J_NEXT:%.*]], [[LOOP]] ]
; CHECK-NEXT:    [[II_NEXT]] = add i32 [[II]], [[STEP1]]
; CHECK-NEXT:    [[J_NEXT]] = add i32 [[J]], [[STEP1]]
; CHECK-NEXT:    [[L_STEP:%.*]] = add i32 [[J]], [[STEP]]
; CHECK-NEXT:    [[CMP:%.*]] = icmp ne i32 [[II_NEXT]], [[LIM:%.*]]
; CHECK-NEXT:    br i1 [[CMP]], label [[LOOP]], label [[RETURN:%.*]]
; CHECK:       return:
; CHECK-NEXT:    [[I_LCSSA:%.*]] = phi i32 [ [[J]], [[LOOP]] ]
; CHECK-NEXT:    [[J_NEXT_LCSSA:%.*]] = phi i32 [ [[J_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    [[K_NEXT_LCSSA:%.*]] = phi i32 [ [[II_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    [[L_STEP_LCSSA:%.*]] = phi i32 [ [[L_STEP]], [[LOOP]] ]
; CHECK-NEXT:    [[L_NEXT_LCSSA:%.*]] = phi i32 [ [[J_NEXT]], [[LOOP]] ]
; CHECK-NEXT:    [[SUM1:%.*]] = add i32 [[I_LCSSA]], [[J_NEXT_LCSSA]]
; CHECK-NEXT:    [[SUM2:%.*]] = add i32 [[SUM1]], [[K_NEXT_LCSSA]]
; CHECK-NEXT:    [[SUM3:%.*]] = add i32 [[SUM1]], [[L_STEP_LCSSA]]
; CHECK-NEXT:    [[SUM4:%.*]] = add i32 [[SUM1]], [[L_NEXT_LCSSA]]
; CHECK-NEXT:    ret i32 [[SUM4]]
;
entry:
  %step1 = add i32 %step, 1
  %init1 = add i32 %init, %step1
  %l.0 = sub i32 %init1, %step1
  br label %loop

loop:
  %ii = phi i32 [ %init1, %entry ], [ %ii.next, %loop ]
  %i = phi i32 [ %init, %entry ], [ %ii, %loop ]
  %j = phi i32 [ %init, %entry ], [ %j.next, %loop ]
  %k = phi i32 [ %init1, %entry ], [ %k.next, %loop ]
  %l = phi i32 [ %l.0, %entry ], [ %l.next, %loop ]
  %ii.next = add i32 %ii, %step1
  %j.next = add i32 %j, %step1
  %k.next = add i32 %k, %step1
  %l.step = add i32 %l, %step
  %l.next = add i32 %l.step, 1
  %cmp = icmp ne i32 %ii.next, %lim
  br i1 %cmp, label %loop, label %return

return:
  %sum1 = add i32 %i, %j.next
  %sum2 = add i32 %sum1, %k.next
  %sum3 = add i32 %sum1, %l.step
  %sum4 = add i32 %sum1, %l.next
  ret i32 %sum4
}

; Test a GEP IV that is derived from another GEP IV by a nop gep that
; lowers the type without changing the expression.
%structIF = type { i32, float }

define void @congruentgepiv(%structIF* %base) nounwind uwtable ssp {
; CHECK-LABEL: @congruentgepiv(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[PTR_IV:%.*]] = phi %structIF* [ [[PTR_INC:%.*]], [[LATCH:%.*]] ], [ [[BASE:%.*]], [[ENTRY:%.*]] ]
; CHECK-NEXT:    [[INDVARS1:%.*]] = bitcast %structIF* [[PTR_IV]] to i32*
; CHECK-NEXT:    store i32 4, i32* [[INDVARS1]], align 4
; CHECK-NEXT:    br i1 false, label [[LATCH]], label [[EXIT:%.*]]
; CHECK:       latch:
; CHECK-NEXT:    [[PTR_INC]] = getelementptr inbounds [[STRUCTIF:%.*]], %structIF* [[PTR_IV]], i64 1
; CHECK-NEXT:    br label [[LOOP]]
; CHECK:       exit:
; CHECK-NEXT:    ret void
;
entry:
  %first = getelementptr inbounds %structIF, %structIF* %base, i64 0, i32 0
  br label %loop

loop:
  %ptr.iv = phi %structIF* [ %ptr.inc, %latch ], [ %base, %entry ]
  %next = phi i32* [ %next.inc, %latch ], [ %first, %entry ]
  store i32 4, i32* %next
  br i1 undef, label %latch, label %exit

latch:                         ; preds = %for.inc50.i
  %ptr.inc = getelementptr inbounds %structIF, %structIF* %ptr.iv, i64 1
  %next.inc = getelementptr inbounds %structIF, %structIF* %ptr.inc, i64 0, i32 0
  br label %loop

exit:
  ret void
}

declare void @use32(i32 %x)
declare void @use64(i64 %x)

; Test a widened IV that is used by a phi on different paths within the loop.
define void @phiUsesTrunc() nounwind {
; CHECK-LABEL: @phiUsesTrunc(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br i1 undef, label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END:%.*]]
; CHECK:       for.body.preheader:
; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
; CHECK:       for.body:
; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ 1, [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_INC:%.*]] ]
; CHECK-NEXT:    [[TMP0:%.*]] = trunc i64 [[INDVARS_IV]] to i32
; CHECK-NEXT:    br i1 undef, label [[IF_THEN:%.*]], label [[IF_ELSE:%.*]]
; CHECK:       if.then:
; CHECK-NEXT:    br i1 undef, label [[IF_THEN33:%.*]], label [[FOR_INC]]
; CHECK:       if.then33:
; CHECK-NEXT:    br label [[FOR_INC]]
; CHECK:       if.else:
; CHECK-NEXT:    br i1 undef, label [[IF_THEN97:%.*]], label [[FOR_INC]]
; CHECK:       if.then97:
; CHECK-NEXT:    call void @use64(i64 [[INDVARS_IV]])
; CHECK-NEXT:    br label [[FOR_INC]]
; CHECK:       for.inc:
; CHECK-NEXT:    [[KMIN_1:%.*]] = phi i32 [ [[TMP0]], [[IF_THEN33]] ], [ 0, [[IF_THEN]] ], [ [[TMP0]], [[IF_THEN97]] ], [ 0, [[IF_ELSE]] ]
; CHECK-NEXT:    call void @use32(i32 [[KMIN_1]])
; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
; CHECK-NEXT:    br i1 false, label [[FOR_BODY]], label [[FOR_END_LOOPEXIT:%.*]]
; CHECK:       for.end.loopexit:
; CHECK-NEXT:    br label [[FOR_END]]
; CHECK:       for.end:
; CHECK-NEXT:    ret void
;
entry:
  br i1 undef, label %for.body, label %for.end

for.body:
  %iv = phi i32 [ %inc, %for.inc ], [ 1, %entry ]
  br i1 undef, label %if.then, label %if.else

if.then:
  br i1 undef, label %if.then33, label %for.inc

if.then33:
  br label %for.inc

if.else:
  br i1 undef, label %if.then97, label %for.inc

if.then97:
  %idxprom100 = sext i32 %iv to i64
  call void @use64(i64 %idxprom100)
  br label %for.inc

for.inc:
  %kmin.1 = phi i32 [ %iv, %if.then33 ], [ 0, %if.then ], [ %iv, %if.then97 ], [ 0, %if.else ]
  call void @use32(i32 %kmin.1)
  %inc = add nsw i32 %iv, 1
  br i1 undef, label %for.body, label %for.end

for.end:
  ret void
}