test/Transforms/JumpThreading/select.ll - third_party/swift-llvm - Git at Google

 ; RUN: opt -S -jump-threading < %s | FileCheck %s

 declare void @foo()
 declare void @bar()
 declare void @baz()
 declare void @quux()


 ; Jump threading of branch with select as condition.
 ; Mostly theoretical since instruction combining simplifies all selects of
 ; booleans where at least one operand is true/false/undef.

 ; CHECK-LABEL: @test_br(
 ; CHECK-NEXT: entry:
 ; CHECK-NEXT: br i1 %cond, label %L1,
 define void @test_br(i1 %cond, i1 %value) nounwind {
 entry:
   br i1 %cond, label %L0, label %L3
 L0:
   %expr = select i1 %cond, i1 true, i1 %value
   br i1 %expr, label %L1, label %L2

 L1:
   call void @foo()
   ret void
 L2:
   call void @bar()
   ret void
 L3:
   call void @baz()
   br label %L0
 }


 ; Jump threading of switch with select as condition.

 ; CHECK-LABEL: @test_switch(
 ; CHECK-NEXT: entry:
 ; CHECK-NEXT: br i1 %cond, label %L1,
 define void @test_switch(i1 %cond, i8 %value) nounwind {
 entry:
   br i1 %cond, label %L0, label %L4
 L0:
   %expr = select i1 %cond, i8 1, i8 %value
   switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]

 L1:
   call void @foo()
   ret void
 L2:
   call void @bar()
   ret void
 L3:
   call void @baz()
   ret void
 L4:
   call void @quux()
   br label %L0
 }

 ; Make sure the blocks in the indirectbr test aren't trivially removable as
 ; successors by taking their addresses.
 @anchor = constant [3 x i8*] [
   i8* blockaddress(@test_indirectbr, %L1),
   i8* blockaddress(@test_indirectbr, %L2),
   i8* blockaddress(@test_indirectbr, %L3)
 ]


 ; Jump threading of indirectbr with select as address.

 ; CHECK-LABEL: @test_indirectbr(
 ; CHECK-NEXT: entry:
 ; CHECK-NEXT: br i1 %cond, label %L1, label %L3
 define void @test_indirectbr(i1 %cond, i8* %address) nounwind {
 entry:
   br i1 %cond, label %L0, label %L3
 L0:
   %indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr, %L1), i8* %address
   indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]

 L1:
   call void @foo()
   ret void
 L2:
   call void @bar()
   ret void
 L3:
   call void @baz()
   ret void
 }


 ; Jump threading of indirectbr with select as address.  Test increased
 ; duplication threshold for cases where indirectbr is being threaded
 ; through.

 ; CHECK-LABEL: @test_indirectbr_thresh(
 ; CHECK-NEXT: entry:
 ; CHECK-NEXT: br i1 %cond, label %L1, label %L3
 ; CHECK-NOT: indirectbr
 define void @test_indirectbr_thresh(i1 %cond, i8* %address) nounwind {
 entry:
   br i1 %cond, label %L0, label %L3
 L0:
   %indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr_thresh, %L1), i8* %address
   call void @quux()
   call void @quux()
   call void @quux()
   indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]

 L1:
   call void @foo()
   ret void
 L2:
   call void @bar()
   ret void
 L3:
   call void @baz()
   ret void
 }


 ; A more complicated case: the condition is a select based on a comparison.

 ; CHECK-LABEL: @test_switch_cmp(
 ; CHECK-NEXT: entry:
 ; CHECK-NEXT: br i1 %cond, label %L0, label %[[THREADED:[A-Za-z.0-9]+]]
 ; CHECK: [[THREADED]]:
 ; CHECK-NEXT: call void @quux
 ; CHECK-NEXT: br label %L1
 define void @test_switch_cmp(i1 %cond, i32 %val, i8 %value) nounwind {
 entry:
   br i1 %cond, label %L0, label %L4
 L0:
   %val.phi = phi i32 [%val, %entry], [-1, %L4]
   %cmp = icmp slt i32 %val.phi, 0
   %expr = select i1 %cmp, i8 1, i8 %value
   switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]

 L1:
   call void @foo()
   ret void
 L2:
   call void @bar()
   ret void
 L3:
   call void @baz()
   ret void
 L4:
   call void @quux()
   br label %L0
 }

 ; Make sure the edge value of %0 from entry to L2 includes 0 and L3 is
 ; reachable.
 ; CHECK: test_switch_default
 ; CHECK: entry:
 ; CHECK: load
 ; CHECK: icmp
 ; CHECK: [[THREADED:[A-Za-z.0-9]+]]:
 ; CHECK: store
 ; CHECK: br
 ; CHECK: L2:
 ; CHECK: icmp
 define void @test_switch_default(i32* nocapture %status) nounwind {
 entry:
   %0 = load i32, i32* %status, align 4
   switch i32 %0, label %L2 [
     i32 5061, label %L1
     i32 0, label %L2
   ]

 L1:
   store i32 10025, i32* %status, align 4
   br label %L2

 L2:
   %1 = load i32, i32* %status, align 4
   %cmp57.i = icmp eq i32 %1, 0
   br i1 %cmp57.i, label %L3, label %L4

 L3:
   store i32 10000, i32* %status, align 4
   br label %L4

 L4:
   ret void
 }

 define void @unfold1(double %x, double %y) nounwind {
 entry:
   %sub = fsub double %x, %y
   %cmp = fcmp ogt double %sub, 1.000000e+01
   br i1 %cmp, label %cond.end4, label %cond.false

 cond.false:                                       ; preds = %entry
   %add = fadd double %x, %y
   %cmp1 = fcmp ogt double %add, 1.000000e+01
   %add. = select i1 %cmp1, double %add, double 0.000000e+00
   br label %cond.end4

 cond.end4:                                        ; preds = %entry, %cond.false
   %cond5 = phi double [ %add., %cond.false ], [ %sub, %entry ]
   %cmp6 = fcmp oeq double %cond5, 0.000000e+00
   br i1 %cmp6, label %if.then, label %if.end

 if.then:                                          ; preds = %cond.end4
   call void @foo()
   br label %if.end

 if.end:                                           ; preds = %if.then, %cond.end4
   ret void

 ; CHECK-LABEL: @unfold1
 ; CHECK: br i1 %cmp, label %cond.end4, label %cond.false
 ; CHECK: br i1 %cmp1, label %cond.end4, label %if.then
 ; CHECK: br i1 %cmp6, label %if.then, label %if.end
 ; CHECK: br label %if.end
 }


 define void @unfold2(i32 %x, i32 %y) nounwind {
 entry:
   %sub = sub nsw i32 %x, %y
   %cmp = icmp sgt i32 %sub, 10
   br i1 %cmp, label %cond.end4, label %cond.false

 cond.false:                                       ; preds = %entry
   %add = add nsw i32 %x, %y
   %cmp1 = icmp sgt i32 %add, 10
   %add. = select i1 %cmp1, i32 0, i32 %add
   br label %cond.end4

 cond.end4:                                        ; preds = %entry, %cond.false
   %cond5 = phi i32 [ %add., %cond.false ], [ %sub, %entry ]
   %cmp6 = icmp eq i32 %cond5, 0
   br i1 %cmp6, label %if.then, label %if.end

 if.then:                                          ; preds = %cond.end4
   call void @foo()
   br label %if.end

 if.end:                                           ; preds = %if.then, %cond.end4
   ret void

 ; CHECK-LABEL: @unfold2
 ; CHECK: br i1 %cmp, label %if.end, label %cond.false
 ; CHECK: br i1 %cmp1, label %if.then, label %cond.end4
 ; CHECK: br i1 %cmp6, label %if.then, label %if.end
 ; CHECK: br label %if.end
 }


 define i32 @unfold3(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
 entry:
   %add3 = add nsw i32 %j, 2
   %cmp.i = icmp slt i32 %u, %v
   br i1 %cmp.i, label %.exit, label %cond.false.i

 cond.false.i:                                     ; preds = %entry
   %cmp4.i = icmp sgt i32 %u, %v
   br i1 %cmp4.i, label %.exit, label %cond.false.6.i

 cond.false.6.i:                                   ; preds = %cond.false.i
   %cmp8.i = icmp slt i32 %w, %x
   br i1 %cmp8.i, label %.exit, label %cond.false.10.i

 cond.false.10.i:                                  ; preds = %cond.false.6.i
   %cmp13.i = icmp sgt i32 %w, %x
   br i1 %cmp13.i, label %.exit, label %cond.false.15.i

 cond.false.15.i:                                  ; preds = %cond.false.10.i
   %phitmp = icmp sge i32 %y, %z
   br label %.exit

 .exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
   %cond23.i = phi i1 [ false, %entry ], [ true, %cond.false.i ], [ false, %cond.false.6.i ], [ %phitmp, %cond.false.15.i ], [ true, %cond.false.10.i ]
   %j.add3 = select i1 %cond23.i, i32 %j, i32 %add3
   ret i32 %j.add3

 ; CHECK-LABEL: @unfold3
 ; CHECK: br i1 %cmp.i, label %.exit.thread2, label %cond.false.i
 ; CHECK: br i1 %cmp4.i, label %.exit.thread, label %cond.false.6.i
 ; CHECK: br i1 %cmp8.i, label %.exit.thread2, label %cond.false.10.i
 ; CHECK: br i1 %cmp13.i, label %.exit.thread, label %.exit
 ; CHECK: br i1 %phitmp, label %.exit.thread, label %.exit.thread2
 ; CHECK: br label %.exit.thread2
 }

 define i32 @unfold4(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
 entry:
   %add3 = add nsw i32 %j, 2
   %cmp.i = icmp slt i32 %u, %v
   br i1 %cmp.i, label %.exit, label %cond.false.i

 cond.false.i:                                     ; preds = %entry
   %cmp4.i = icmp sgt i32 %u, %v
   br i1 %cmp4.i, label %.exit, label %cond.false.6.i

 cond.false.6.i:                                   ; preds = %cond.false.i
   %cmp8.i = icmp slt i32 %w, %x
   br i1 %cmp8.i, label %.exit, label %cond.false.10.i

 cond.false.10.i:                                  ; preds = %cond.false.6.i
   %cmp13.i = icmp sgt i32 %w, %x
   br i1 %cmp13.i, label %.exit, label %cond.false.15.i

 cond.false.15.i:                                  ; preds = %cond.false.10.i
   %cmp19.i = icmp sge i32 %y, %z
   %conv = zext i1 %cmp19.i to i32
   br label %.exit

 .exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
   %cond23.i = phi i32 [ 1, %entry ], [ 0, %cond.false.i ], [ 1, %cond.false.6.i ], [ %conv, %cond.false.15.i ], [ 0, %cond.false.10.i ]
   %lnot.i18 = icmp eq i32 %cond23.i, 1
   %j.add3 = select i1 %lnot.i18, i32 %j, i32 %add3
   ret i32 %j.add3

 ; CHECK-LABEL: @unfold4
 ; CHECK: br i1 %cmp.i, label %.exit.thread, label %cond.false.i
 ; CHECK: br i1 %cmp4.i, label %.exit.thread3, label %cond.false.6.i
 ; CHECK: br i1 %cmp8.i, label %.exit.thread, label %cond.false.10.i
 ; CHECK: br i1 %cmp13.i, label %.exit.thread3, label %.exit
 ; CHECK: br i1 %lnot.i18, label %.exit.thread, label %.exit.thread3
 ; CHECK: br label %.exit.thread3
 }

 define i32 @unfold5(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
 entry:
   %add3 = add nsw i32 %j, 2
   %cmp.i = icmp slt i32 %u, %v
   br i1 %cmp.i, label %.exit, label %cond.false.i

 cond.false.i:                                     ; preds = %entry
   %cmp4.i = icmp sgt i32 %u, %v
   br i1 %cmp4.i, label %.exit, label %cond.false.6.i

 cond.false.6.i:                                   ; preds = %cond.false.i
   %cmp8.i = icmp slt i32 %w, %x
   br i1 %cmp8.i, label %.exit, label %cond.false.10.i

 cond.false.10.i:                                  ; preds = %cond.false.6.i
   %cmp13.i = icmp sgt i32 %w, %x
   br i1 %cmp13.i, label %.exit, label %cond.false.15.i

 cond.false.15.i:                                  ; preds = %cond.false.10.i
   %cmp19.i = icmp sge i32 %y, %z
   %conv = zext i1 %cmp19.i to i32
   br label %.exit

 .exit:                                  ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
   %cond23.i = phi i32 [ 2, %entry ], [ 3, %cond.false.i ], [ 1, %cond.false.6.i ], [ %conv, %cond.false.15.i ], [ 7, %cond.false.10.i ]
   %lnot.i18 = icmp sgt i32 %cond23.i, 5
   %j.add3 = select i1 %lnot.i18, i32 %j, i32 %cond23.i
   ret i32 %j.add3

 ; CHECK-LABEL: @unfold5
 ; CHECK: br i1 %cmp.i, label %.exit, label %cond.false.i
 ; CHECK: br i1 %cmp4.i, label %.exit, label %cond.false.6.i
 ; CHECK: br i1 %cmp8.i, label %.exit, label %cond.false.10.i
 ; CHECK: br i1 %cmp13.i, label %.exit, label %cond.false.15.i
 ; CHECK: br label %.exit
 }
	; RUN: opt -S -jump-threading < %s \| FileCheck %s

	declare void @foo()
	declare void @bar()
	declare void @baz()
	declare void @quux()


	; Jump threading of branch with select as condition.
	; Mostly theoretical since instruction combining simplifies all selects of
	; booleans where at least one operand is true/false/undef.

	; CHECK-LABEL: @test_br(
	; CHECK-NEXT: entry:
	; CHECK-NEXT: br i1 %cond, label %L1,
	define void @test_br(i1 %cond, i1 %value) nounwind {
	entry:
	br i1 %cond, label %L0, label %L3
	L0:
	%expr = select i1 %cond, i1 true, i1 %value
	br i1 %expr, label %L1, label %L2

	L1:
	call void @foo()
	ret void
	L2:
	call void @bar()
	ret void
	L3:
	call void @baz()
	br label %L0
	}


	; Jump threading of switch with select as condition.

	; CHECK-LABEL: @test_switch(
	; CHECK-NEXT: entry:
	; CHECK-NEXT: br i1 %cond, label %L1,
	define void @test_switch(i1 %cond, i8 %value) nounwind {
	entry:
	br i1 %cond, label %L0, label %L4
	L0:
	%expr = select i1 %cond, i8 1, i8 %value
	switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]

	L1:
	call void @foo()
	ret void
	L2:
	call void @bar()
	ret void
	L3:
	call void @baz()
	ret void
	L4:
	call void @quux()
	br label %L0
	}

	; Make sure the blocks in the indirectbr test aren't trivially removable as
	; successors by taking their addresses.
	@anchor = constant [3 x i8*] [
	i8* blockaddress(@test_indirectbr, %L1),
	i8* blockaddress(@test_indirectbr, %L2),
	i8* blockaddress(@test_indirectbr, %L3)
	]


	; Jump threading of indirectbr with select as address.

	; CHECK-LABEL: @test_indirectbr(
	; CHECK-NEXT: entry:
	; CHECK-NEXT: br i1 %cond, label %L1, label %L3
	define void @test_indirectbr(i1 %cond, i8* %address) nounwind {
	entry:
	br i1 %cond, label %L0, label %L3
	L0:
	%indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr, %L1), i8* %address
	indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]

	L1:
	call void @foo()
	ret void
	L2:
	call void @bar()
	ret void
	L3:
	call void @baz()
	ret void
	}


	; Jump threading of indirectbr with select as address. Test increased
	; duplication threshold for cases where indirectbr is being threaded
	; through.

	; CHECK-LABEL: @test_indirectbr_thresh(
	; CHECK-NEXT: entry:
	; CHECK-NEXT: br i1 %cond, label %L1, label %L3
	; CHECK-NOT: indirectbr
	define void @test_indirectbr_thresh(i1 %cond, i8* %address) nounwind {
	entry:
	br i1 %cond, label %L0, label %L3
	L0:
	%indirect.goto.dest = select i1 %cond, i8* blockaddress(@test_indirectbr_thresh, %L1), i8* %address
	call void @quux()
	call void @quux()
	call void @quux()
	indirectbr i8* %indirect.goto.dest, [label %L1, label %L2, label %L3]

	L1:
	call void @foo()
	ret void
	L2:
	call void @bar()
	ret void
	L3:
	call void @baz()
	ret void
	}


	; A more complicated case: the condition is a select based on a comparison.

	; CHECK-LABEL: @test_switch_cmp(
	; CHECK-NEXT: entry:
	; CHECK-NEXT: br i1 %cond, label %L0, label %[[THREADED:[A-Za-z.0-9]+]]
	; CHECK: [[THREADED]]:
	; CHECK-NEXT: call void @quux
	; CHECK-NEXT: br label %L1
	define void @test_switch_cmp(i1 %cond, i32 %val, i8 %value) nounwind {
	entry:
	br i1 %cond, label %L0, label %L4
	L0:
	%val.phi = phi i32 [%val, %entry], [-1, %L4]
	%cmp = icmp slt i32 %val.phi, 0
	%expr = select i1 %cmp, i8 1, i8 %value
	switch i8 %expr, label %L3 [i8 1, label %L1 i8 2, label %L2]

	L1:
	call void @foo()
	ret void
	L2:
	call void @bar()
	ret void
	L3:
	call void @baz()
	ret void
	L4:
	call void @quux()
	br label %L0
	}

	; Make sure the edge value of %0 from entry to L2 includes 0 and L3 is
	; reachable.
	; CHECK: test_switch_default
	; CHECK: entry:
	; CHECK: load
	; CHECK: icmp
	; CHECK: [[THREADED:[A-Za-z.0-9]+]]:
	; CHECK: store
	; CHECK: br
	; CHECK: L2:
	; CHECK: icmp
	define void @test_switch_default(i32* nocapture %status) nounwind {
	entry:
	%0 = load i32, i32* %status, align 4
	switch i32 %0, label %L2 [
	i32 5061, label %L1
	i32 0, label %L2
	]

	L1:
	store i32 10025, i32* %status, align 4
	br label %L2

	L2:
	%1 = load i32, i32* %status, align 4
	%cmp57.i = icmp eq i32 %1, 0
	br i1 %cmp57.i, label %L3, label %L4

	L3:
	store i32 10000, i32* %status, align 4
	br label %L4

	L4:
	ret void
	}

	define void @unfold1(double %x, double %y) nounwind {
	entry:
	%sub = fsub double %x, %y
	%cmp = fcmp ogt double %sub, 1.000000e+01
	br i1 %cmp, label %cond.end4, label %cond.false

	cond.false: ; preds = %entry
	%add = fadd double %x, %y
	%cmp1 = fcmp ogt double %add, 1.000000e+01
	%add. = select i1 %cmp1, double %add, double 0.000000e+00
	br label %cond.end4

	cond.end4: ; preds = %entry, %cond.false
	%cond5 = phi double [ %add., %cond.false ], [ %sub, %entry ]
	%cmp6 = fcmp oeq double %cond5, 0.000000e+00
	br i1 %cmp6, label %if.then, label %if.end

	if.then: ; preds = %cond.end4
	call void @foo()
	br label %if.end

	if.end: ; preds = %if.then, %cond.end4
	ret void

	; CHECK-LABEL: @unfold1
	; CHECK: br i1 %cmp, label %cond.end4, label %cond.false
	; CHECK: br i1 %cmp1, label %cond.end4, label %if.then
	; CHECK: br i1 %cmp6, label %if.then, label %if.end
	; CHECK: br label %if.end
	}


	define void @unfold2(i32 %x, i32 %y) nounwind {
	entry:
	%sub = sub nsw i32 %x, %y
	%cmp = icmp sgt i32 %sub, 10
	br i1 %cmp, label %cond.end4, label %cond.false

	cond.false: ; preds = %entry
	%add = add nsw i32 %x, %y
	%cmp1 = icmp sgt i32 %add, 10
	%add. = select i1 %cmp1, i32 0, i32 %add
	br label %cond.end4

	cond.end4: ; preds = %entry, %cond.false
	%cond5 = phi i32 [ %add., %cond.false ], [ %sub, %entry ]
	%cmp6 = icmp eq i32 %cond5, 0
	br i1 %cmp6, label %if.then, label %if.end

	if.then: ; preds = %cond.end4
	call void @foo()
	br label %if.end

	if.end: ; preds = %if.then, %cond.end4
	ret void

	; CHECK-LABEL: @unfold2
	; CHECK: br i1 %cmp, label %if.end, label %cond.false
	; CHECK: br i1 %cmp1, label %if.then, label %cond.end4
	; CHECK: br i1 %cmp6, label %if.then, label %if.end
	; CHECK: br label %if.end
	}


	define i32 @unfold3(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
	entry:
	%add3 = add nsw i32 %j, 2
	%cmp.i = icmp slt i32 %u, %v
	br i1 %cmp.i, label %.exit, label %cond.false.i

	cond.false.i: ; preds = %entry
	%cmp4.i = icmp sgt i32 %u, %v
	br i1 %cmp4.i, label %.exit, label %cond.false.6.i

	cond.false.6.i: ; preds = %cond.false.i
	%cmp8.i = icmp slt i32 %w, %x
	br i1 %cmp8.i, label %.exit, label %cond.false.10.i

	cond.false.10.i: ; preds = %cond.false.6.i
	%cmp13.i = icmp sgt i32 %w, %x
	br i1 %cmp13.i, label %.exit, label %cond.false.15.i

	cond.false.15.i: ; preds = %cond.false.10.i
	%phitmp = icmp sge i32 %y, %z
	br label %.exit

	.exit: ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
	%cond23.i = phi i1 [ false, %entry ], [ true, %cond.false.i ], [ false, %cond.false.6.i ], [ %phitmp, %cond.false.15.i ], [ true, %cond.false.10.i ]
	%j.add3 = select i1 %cond23.i, i32 %j, i32 %add3
	ret i32 %j.add3

	; CHECK-LABEL: @unfold3
	; CHECK: br i1 %cmp.i, label %.exit.thread2, label %cond.false.i
	; CHECK: br i1 %cmp4.i, label %.exit.thread, label %cond.false.6.i
	; CHECK: br i1 %cmp8.i, label %.exit.thread2, label %cond.false.10.i
	; CHECK: br i1 %cmp13.i, label %.exit.thread, label %.exit
	; CHECK: br i1 %phitmp, label %.exit.thread, label %.exit.thread2
	; CHECK: br label %.exit.thread2
	}

	define i32 @unfold4(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
	entry:
	%add3 = add nsw i32 %j, 2
	%cmp.i = icmp slt i32 %u, %v
	br i1 %cmp.i, label %.exit, label %cond.false.i

	cond.false.i: ; preds = %entry
	%cmp4.i = icmp sgt i32 %u, %v
	br i1 %cmp4.i, label %.exit, label %cond.false.6.i

	cond.false.6.i: ; preds = %cond.false.i
	%cmp8.i = icmp slt i32 %w, %x
	br i1 %cmp8.i, label %.exit, label %cond.false.10.i

	cond.false.10.i: ; preds = %cond.false.6.i
	%cmp13.i = icmp sgt i32 %w, %x
	br i1 %cmp13.i, label %.exit, label %cond.false.15.i

	cond.false.15.i: ; preds = %cond.false.10.i
	%cmp19.i = icmp sge i32 %y, %z
	%conv = zext i1 %cmp19.i to i32
	br label %.exit

	.exit: ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
	%cond23.i = phi i32 [ 1, %entry ], [ 0, %cond.false.i ], [ 1, %cond.false.6.i ], [ %conv, %cond.false.15.i ], [ 0, %cond.false.10.i ]
	%lnot.i18 = icmp eq i32 %cond23.i, 1
	%j.add3 = select i1 %lnot.i18, i32 %j, i32 %add3
	ret i32 %j.add3

	; CHECK-LABEL: @unfold4
	; CHECK: br i1 %cmp.i, label %.exit.thread, label %cond.false.i
	; CHECK: br i1 %cmp4.i, label %.exit.thread3, label %cond.false.6.i
	; CHECK: br i1 %cmp8.i, label %.exit.thread, label %cond.false.10.i
	; CHECK: br i1 %cmp13.i, label %.exit.thread3, label %.exit
	; CHECK: br i1 %lnot.i18, label %.exit.thread, label %.exit.thread3
	; CHECK: br label %.exit.thread3
	}

	define i32 @unfold5(i32 %u, i32 %v, i32 %w, i32 %x, i32 %y, i32 %z, i32 %j) nounwind {
	entry:
	%add3 = add nsw i32 %j, 2
	%cmp.i = icmp slt i32 %u, %v
	br i1 %cmp.i, label %.exit, label %cond.false.i

	cond.false.i: ; preds = %entry
	%cmp4.i = icmp sgt i32 %u, %v
	br i1 %cmp4.i, label %.exit, label %cond.false.6.i

	cond.false.6.i: ; preds = %cond.false.i
	%cmp8.i = icmp slt i32 %w, %x
	br i1 %cmp8.i, label %.exit, label %cond.false.10.i

	cond.false.10.i: ; preds = %cond.false.6.i
	%cmp13.i = icmp sgt i32 %w, %x
	br i1 %cmp13.i, label %.exit, label %cond.false.15.i

	cond.false.15.i: ; preds = %cond.false.10.i
	%cmp19.i = icmp sge i32 %y, %z
	%conv = zext i1 %cmp19.i to i32
	br label %.exit

	.exit: ; preds = %entry, %cond.false.i, %cond.false.6.i, %cond.false.10.i, %cond.false.15.i
	%cond23.i = phi i32 [ 2, %entry ], [ 3, %cond.false.i ], [ 1, %cond.false.6.i ], [ %conv, %cond.false.15.i ], [ 7, %cond.false.10.i ]
	%lnot.i18 = icmp sgt i32 %cond23.i, 5
	%j.add3 = select i1 %lnot.i18, i32 %j, i32 %cond23.i
	ret i32 %j.add3

	; CHECK-LABEL: @unfold5
	; CHECK: br i1 %cmp.i, label %.exit, label %cond.false.i
	; CHECK: br i1 %cmp4.i, label %.exit, label %cond.false.6.i
	; CHECK: br i1 %cmp8.i, label %.exit, label %cond.false.10.i
	; CHECK: br i1 %cmp13.i, label %.exit, label %cond.false.15.i
	; CHECK: br label %.exit
	}