; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -loop-unroll -S -unroll-threshold=120 -unroll-max-iteration-count-to-analyze=100 < %s | FileCheck %s

; TODO: None of the if.false blocks are reachable, it would be nice if
; the output of unrolling made this obvious and didn't rely on other
; passes to cleanup code the cost model already knew was dead.

@G = global i32 0

; Symbolic simplification can prove the value of %zext on first
; iteration, and can prove that it's loop invariant on the second
define i32 @test_symbolic_simplify(i32 %limit) {
; CHECK-LABEL: @test_symbolic_simplify(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    store i32 -1, i32* @G, align 4
; CHECK-NEXT:    [[CMP_1:%.*]] = icmp eq i32 0, [[LIMIT:%.*]]
; CHECK-NEXT:    [[ZEXT_1:%.*]] = sext i1 [[CMP_1]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_1]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_2:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_2:%.*]] = sext i1 [[CMP_2]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_2]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_3:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_3:%.*]] = sext i1 [[CMP_3]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_3]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_4:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_4:%.*]] = sext i1 [[CMP_4]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_4]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_5:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_5:%.*]] = sext i1 [[CMP_5]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_5]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_6:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_6:%.*]] = sext i1 [[CMP_6]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_6]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_7:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_7:%.*]] = sext i1 [[CMP_7]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_7]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_8:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_8:%.*]] = sext i1 [[CMP_8]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_8]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_9:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_9:%.*]] = sext i1 [[CMP_9]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_9]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_10:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_10:%.*]] = sext i1 [[CMP_10]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_10]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_11:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_11:%.*]] = sext i1 [[CMP_11]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_11]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_12:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_12:%.*]] = sext i1 [[CMP_12]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_12]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_13:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_13:%.*]] = sext i1 [[CMP_13]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_13]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_14:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_14:%.*]] = sext i1 [[CMP_14]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_14]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_15:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_15:%.*]] = sext i1 [[CMP_15]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_15]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_16:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_16:%.*]] = sext i1 [[CMP_16]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_16]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_17:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_17:%.*]] = sext i1 [[CMP_17]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_17]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_18:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_18:%.*]] = sext i1 [[CMP_18]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_18]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_19:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_19:%.*]] = sext i1 [[CMP_19]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_19]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_20:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_20:%.*]] = sext i1 [[CMP_20]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_20]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_21:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_21:%.*]] = sext i1 [[CMP_21]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_21]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_22:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_22:%.*]] = sext i1 [[CMP_22]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_22]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_23:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_23:%.*]] = sext i1 [[CMP_23]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_23]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_24:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_24:%.*]] = sext i1 [[CMP_24]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_24]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_25:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_25:%.*]] = sext i1 [[CMP_25]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_25]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_26:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_26:%.*]] = sext i1 [[CMP_26]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_26]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_27:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_27:%.*]] = sext i1 [[CMP_27]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_27]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_28:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_28:%.*]] = sext i1 [[CMP_28]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_28]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_29:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_29:%.*]] = sext i1 [[CMP_29]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_29]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_30:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_30:%.*]] = sext i1 [[CMP_30]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_30]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_31:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_31:%.*]] = sext i1 [[CMP_31]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_31]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_32:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_32:%.*]] = sext i1 [[CMP_32]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_32]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_33:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_33:%.*]] = sext i1 [[CMP_33]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_33]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_34:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_34:%.*]] = sext i1 [[CMP_34]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_34]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_35:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_35:%.*]] = sext i1 [[CMP_35]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_35]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_36:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_36:%.*]] = sext i1 [[CMP_36]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_36]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_37:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_37:%.*]] = sext i1 [[CMP_37]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_37]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_38:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_38:%.*]] = sext i1 [[CMP_38]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_38]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_39:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_39:%.*]] = sext i1 [[CMP_39]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_39]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_40:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_40:%.*]] = sext i1 [[CMP_40]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_40]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_41:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_41:%.*]] = sext i1 [[CMP_41]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_41]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_42:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_42:%.*]] = sext i1 [[CMP_42]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_42]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_43:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_43:%.*]] = sext i1 [[CMP_43]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_43]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_44:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_44:%.*]] = sext i1 [[CMP_44]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_44]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_45:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_45:%.*]] = sext i1 [[CMP_45]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_45]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_46:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_46:%.*]] = sext i1 [[CMP_46]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_46]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_47:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_47:%.*]] = sext i1 [[CMP_47]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_47]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_48:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_48:%.*]] = sext i1 [[CMP_48]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_48]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_49:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_49:%.*]] = sext i1 [[CMP_49]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_49]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_50:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_50:%.*]] = sext i1 [[CMP_50]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_50]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_51:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_51:%.*]] = sext i1 [[CMP_51]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_51]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_52:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_52:%.*]] = sext i1 [[CMP_52]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_52]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_53:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_53:%.*]] = sext i1 [[CMP_53]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_53]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_54:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_54:%.*]] = sext i1 [[CMP_54]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_54]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_55:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_55:%.*]] = sext i1 [[CMP_55]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_55]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_56:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_56:%.*]] = sext i1 [[CMP_56]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_56]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_57:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_57:%.*]] = sext i1 [[CMP_57]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_57]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_58:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_58:%.*]] = sext i1 [[CMP_58]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_58]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_59:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_59:%.*]] = sext i1 [[CMP_59]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_59]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_60:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_60:%.*]] = sext i1 [[CMP_60]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_60]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_61:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_61:%.*]] = sext i1 [[CMP_61]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_61]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_62:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_62:%.*]] = sext i1 [[CMP_62]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_62]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_63:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_63:%.*]] = sext i1 [[CMP_63]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_63]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_64:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_64:%.*]] = sext i1 [[CMP_64]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_64]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_65:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_65:%.*]] = sext i1 [[CMP_65]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_65]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_66:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_66:%.*]] = sext i1 [[CMP_66]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_66]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_67:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_67:%.*]] = sext i1 [[CMP_67]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_67]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_68:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_68:%.*]] = sext i1 [[CMP_68]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_68]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_69:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_69:%.*]] = sext i1 [[CMP_69]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_69]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_70:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_70:%.*]] = sext i1 [[CMP_70]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_70]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_71:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_71:%.*]] = sext i1 [[CMP_71]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_71]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_72:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_72:%.*]] = sext i1 [[CMP_72]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_72]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_73:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_73:%.*]] = sext i1 [[CMP_73]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_73]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_74:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_74:%.*]] = sext i1 [[CMP_74]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_74]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_75:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_75:%.*]] = sext i1 [[CMP_75]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_75]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_76:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_76:%.*]] = sext i1 [[CMP_76]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_76]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_77:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_77:%.*]] = sext i1 [[CMP_77]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_77]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_78:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_78:%.*]] = sext i1 [[CMP_78]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_78]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_79:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_79:%.*]] = sext i1 [[CMP_79]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_79]], i32* @G, align 4
; CHECK-NEXT:    [[CMP_80:%.*]] = icmp eq i32 0, [[LIMIT]]
; CHECK-NEXT:    [[ZEXT_80:%.*]] = sext i1 [[CMP_80]] to i32
; CHECK-NEXT:    store i32 [[ZEXT_80]], i32* @G, align 4
; CHECK-NEXT:    ret i32 [[ZEXT_80]]
;
entry:
  br label %loop

loop:                                             ; preds = %backedge, %entry
  %phi = phi i32 [ 0, %entry ], [ %limit, %loop ]
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %loop ]
  %sub = sub i32 %limit, %phi
  %cmp = icmp eq i32 %sub, %limit
  %zext = sext i1 %cmp to i32
  store i32 %zext, i32* @G
  %iv.next = add i32 %iv, 1
  %loop.cond = icmp ne i32 %iv, 80
  br i1 %loop.cond, label %loop, label %done

done:                                             ; preds = %backedge
  ret i32 %zext
}

; Use symbolic value facts to prune unreachable (expensive) paths
; through the loop.
define i32 @test_symbolic_path(i32 %limit) {
; CHECK-LABEL: @test_symbolic_path(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE:%.*]], label [[IF_FALSE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE]]
; CHECK:       backedge:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE_1:%.*]], label [[IF_FALSE_1:%.*]]
; CHECK:       if.false.1:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE_1]]
; CHECK:       backedge.1:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE_2:%.*]], label [[IF_FALSE_2:%.*]]
; CHECK:       if.false.2:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE_2]]
; CHECK:       backedge.2:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE_3:%.*]], label [[IF_FALSE_3:%.*]]
; CHECK:       if.false.3:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE_3]]
; CHECK:       backedge.3:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE_4:%.*]], label [[IF_FALSE_4:%.*]]
; CHECK:       if.false.4:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE_4]]
; CHECK:       backedge.4:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE_5:%.*]], label [[IF_FALSE_5:%.*]]
; CHECK:       if.false.5:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE_5]]
; CHECK:       backedge.5:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE_6:%.*]], label [[IF_FALSE_6:%.*]]
; CHECK:       if.false.6:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE_6]]
; CHECK:       backedge.6:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE_7:%.*]], label [[IF_FALSE_7:%.*]]
; CHECK:       if.false.7:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE_7]]
; CHECK:       backedge.7:
; CHECK-NEXT:    br i1 true, label [[BACKEDGE_8:%.*]], label [[IF_FALSE_8:%.*]]
; CHECK:       if.false.8:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE_8]]
; CHECK:       backedge.8:
; CHECK-NEXT:    ret i32 0
;
entry:
  br label %loop

loop:                                             ; preds = %backedge, %entry
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %backedge ]
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
  %sub = sub i32 %limit, %sum
  %is.positive = icmp eq i32 %sub, %limit
  br i1 %is.positive, label %backedge, label %if.false

if.false:                                         ; preds = %loop
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  br label %backedge

backedge:                                         ; preds = %if.false, %loop
  %hidden_zero = sub i32 %limit, %sub
  %sum.next = add i32 %sum, %hidden_zero
  %iv.next = add i32 %iv, 1
  %loop.cond = icmp ne i32 %iv, 8
  br i1 %loop.cond, label %loop, label %done

done:                                             ; preds = %backedge
  %sum.next.lcssa = phi i32 [ %sum.next, %backedge ]
  ret i32 %sum.next.lcssa
}

; A test to show the ability to simplify branches (even without general
; symbolic execution of the loop beyond constants) is still useful.
define i32 @test_dom_condition(i32 %limit) {
; CHECK-LABEL: @test_dom_condition(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[LOOP_GUARD:%.*]] = icmp sge i32 [[LIMIT:%.*]], 0
; CHECK-NEXT:    br i1 [[LOOP_GUARD]], label [[LOOP_PREHEADER:%.*]], label [[FAILURE:%.*]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ [[SUM_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[BACKEDGE]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 0, [[SUM]]
; CHECK-NEXT:    [[IS_POSITIVE:%.*]] = icmp sle i32 [[SUB]], [[LIMIT]]
; CHECK-NEXT:    br i1 [[IS_POSITIVE]], label [[BACKEDGE]], label [[IF_FALSE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE]]
; CHECK:       backedge:
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[SUB]]
; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    [[LOOP_COND:%.*]] = icmp ne i32 [[IV]], 8
; CHECK-NEXT:    br i1 [[LOOP_COND]], label [[LOOP]], label [[DONE:%.*]]
; CHECK:       done:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[BACKEDGE]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       failure:
; CHECK-NEXT:    unreachable
;
entry:
  %loop_guard = icmp sge i32 %limit, 0
  br i1 %loop_guard, label %loop, label %failure

loop:                                             ; preds = %backedge, %entry
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %backedge ]
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
  %sub = sub i32 0, %sum
  %is.positive = icmp sle i32 %sub, %limit
  br i1 %is.positive, label %backedge, label %if.false

if.false:                                         ; preds = %loop
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  br label %backedge

backedge:                                         ; preds = %if.false, %loop
  %sum.next = add i32 %sum, %sub
  %iv.next = add i32 %iv, 1
  %loop.cond = icmp ne i32 %iv, 8
  br i1 %loop.cond, label %loop, label %done

done:                                             ; preds = %backedge
  %sum.next.lcssa = phi i32 [ %sum.next, %backedge ]
  ret i32 %sum.next.lcssa

failure:
  unreachable
}

; We can symbolically evaluate %sub to %limit on first iteration, and
; to zero on all future iterations.
define i32 @test_both(i32 %limit) {
; CHECK-LABEL: @test_both(
; CHECK-NEXT:  entry:
; CHECK-NEXT:    [[LOOP_GUARD:%.*]] = icmp sge i32 [[LIMIT:%.*]], 0
; CHECK-NEXT:    br i1 [[LOOP_GUARD]], label [[LOOP_PREHEADER:%.*]], label [[FAILURE:%.*]]
; CHECK:       loop.preheader:
; CHECK-NEXT:    br label [[LOOP:%.*]]
; CHECK:       loop:
; CHECK-NEXT:    [[SUM:%.*]] = phi i32 [ [[SUM_NEXT:%.*]], [[BACKEDGE:%.*]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[IV:%.*]] = phi i32 [ [[IV_NEXT:%.*]], [[BACKEDGE]] ], [ 0, [[LOOP_PREHEADER]] ]
; CHECK-NEXT:    [[SUB:%.*]] = sub i32 [[LIMIT]], [[SUM]]
; CHECK-NEXT:    [[IS_POSITIVE:%.*]] = icmp sge i32 [[SUB]], 0
; CHECK-NEXT:    br i1 [[IS_POSITIVE]], label [[BACKEDGE]], label [[IF_FALSE:%.*]]
; CHECK:       if.false:
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    call void @foo()
; CHECK-NEXT:    br label [[BACKEDGE]]
; CHECK:       backedge:
; CHECK-NEXT:    [[SUM_NEXT]] = add i32 [[SUM]], [[SUB]]
; CHECK-NEXT:    [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT:    [[LOOP_COND:%.*]] = icmp ne i32 [[IV]], 8
; CHECK-NEXT:    br i1 [[LOOP_COND]], label [[LOOP]], label [[DONE:%.*]]
; CHECK:       done:
; CHECK-NEXT:    [[SUM_NEXT_LCSSA:%.*]] = phi i32 [ [[SUM_NEXT]], [[BACKEDGE]] ]
; CHECK-NEXT:    ret i32 [[SUM_NEXT_LCSSA]]
; CHECK:       failure:
; CHECK-NEXT:    unreachable
;
entry:
  %loop_guard = icmp sge i32 %limit, 0
  br i1 %loop_guard, label %loop, label %failure

loop:                                             ; preds = %backedge, %entry
  %sum = phi i32 [ 0, %entry ], [ %sum.next, %backedge ]
  %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
  %sub = sub i32 %limit, %sum
  %is.positive = icmp sge i32 %sub, 0
  br i1 %is.positive, label %backedge, label %if.false

if.false:                                         ; preds = %loop
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  call void @foo()
  br label %backedge

backedge:                                         ; preds = %if.false, %loop
  %sum.next = add i32 %sum, %sub
  %iv.next = add i32 %iv, 1
  %loop.cond = icmp ne i32 %iv, 8
  br i1 %loop.cond, label %loop, label %done

done:                                             ; preds = %backedge
  %sum.next.lcssa = phi i32 [ %sum.next, %backedge ]
  ret i32 %sum.next.lcssa

failure:
  unreachable
}

declare void @foo()