test/Transforms/LoopVectorize/no_outside_user.ll - llvm-project/llvm - Git at Google

 ; RUN: opt -S -loop-vectorize -force-vector-interleave=1 -force-vector-width=2 < %s 2>&1 | FileCheck %s

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

 @f = common global i32 0, align 4
 @.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
 @c = common global i32 0, align 4
 @a = common global i32 0, align 4
 @b = common global i32 0, align 4
 @e = common global i32 0, align 4

 ; It has a value that is used outside of the loop
 ; and is not a recognized reduction variable "tmp17".
 ; However, tmp17 is a non-header phi which is an allowed exit.

 ; CHECK-LABEL: @test1(
 ; CHECK: %vec.ind = phi <2 x i32>
 ; CHECK: [[CMP:%[a-zA-Z0-9.]+]] = icmp sgt <2 x i32> %vec.ind, <i32 10, i32 10>
 ; CHECK: %predphi = select <2 x i1> [[CMP]], <2 x i32> <i32 1, i32 1>, <2 x i32> zeroinitializer

 ; CHECK-LABEL: middle.block:
 ; CHECK:          [[E1:%[a-zA-Z0-9.]+]] = extractelement <2 x i32> %predphi, i32 1

 ; CHECK-LABEL: f1.exit.loopexit:
 ; CHECK:          %.lcssa = phi i32 [ %tmp17, %bb16 ], [ [[E1]], %middle.block ]

 define i32 @test1()  {
 bb:
   %b.promoted = load i32, i32* @b, align 4
   br label %.lr.ph.i

 .lr.ph.i:
   %tmp8 = phi i32 [ %tmp18, %bb16 ], [ %b.promoted, %bb ]
   %tmp2 = icmp sgt i32 %tmp8, 10
   br i1 %tmp2, label %bb16, label %bb10

 bb10:
   br label %bb16

 bb16:
   %tmp17 = phi i32 [ 0, %bb10 ], [ 1, %.lr.ph.i ]
   %tmp18 = add nsw i32 %tmp8, 1
   %tmp19 = icmp slt i32 %tmp18, 4
   br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

 f1.exit.loopexit:
   %.lcssa = phi i32 [ %tmp17, %bb16 ]
   ret i32 %.lcssa
 }

 ; non-hdr phi depends on header phi.
 ; CHECK-LABEL: @test2(
 ; CHECK: %vec.ind = phi <2 x i32>
 ; CHECK: [[CMP:%[a-zA-Z0-9.]+]] = icmp sgt <2 x i32> %vec.ind, <i32 10, i32 10>
 ; CHECK: %predphi = select <2 x i1> [[CMP]], <2 x i32> <i32 1, i32 1>, <2 x i32> %vec.ind

 ; CHECK-LABEL: middle.block:
 ; CHECK:          [[E1:%[a-zA-Z0-9.]+]] = extractelement <2 x i32> %predphi, i32 1

 ; CHECK-LABEL: f1.exit.loopexit:
 ; CHECK:          %.lcssa = phi i32 [ %tmp17, %bb16 ], [ [[E1]], %middle.block ]
 define i32 @test2()  {
 bb:
   %b.promoted = load i32, i32* @b, align 4
   br label %.lr.ph.i

 .lr.ph.i:
   %tmp8 = phi i32 [ %tmp18, %bb16 ], [ %b.promoted, %bb ]
   %tmp2 = icmp sgt i32 %tmp8, 10
   br i1 %tmp2, label %bb16, label %bb10

 bb10:
   br label %bb16

 bb16:
   %tmp17 = phi i32 [ %tmp8, %bb10 ], [ 1, %.lr.ph.i ]
   %tmp18 = add nsw i32 %tmp8, 1
   %tmp19 = icmp slt i32 %tmp18, 4
   br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

 f1.exit.loopexit:
   %.lcssa = phi i32 [ %tmp17, %bb16 ]
   ret i32 %.lcssa
 }

 ; more than 2 incoming values for tmp17 phi that is used outside loop.
 ; CHECK-LABEL: test3(
 ; CHECK-LABEL: vector.body:
 ; CHECK:          %predphi = select <2 x i1> %{{.*}}, <2 x i32> <i32 1, i32 1>, <2 x i32> zeroinitializer
 ; CHECK:          %predphi1 = select <2 x i1> %{{.*}}, <2 x i32> <i32 2, i32 2>, <2 x i32> %predphi

 ; CHECK-LABEL: middle.block:
 ; CHECK:          [[E1:%[a-zA-Z0-9.]+]] = extractelement <2 x i32> %predphi1, i32 1

 ; CHECK-LABEL: f1.exit.loopexit:
 ; CHECK:          phi i32 [ %tmp17, %bb16 ], [ [[E1]], %middle.block ]
 define i32 @test3(i32 %N)  {
 bb:
   %b.promoted = load i32, i32* @b, align 4
   br label %.lr.ph.i

 .lr.ph.i:
   %tmp8 = phi i32 [ %tmp18, %bb16 ], [ %b.promoted, %bb ]
   %tmp2 = icmp sgt i32 %tmp8, 10
   br i1 %tmp2, label %bb16, label %bb10

 bb10:
   %cmp = icmp sgt i32 %tmp8, %N
   br i1  %cmp, label %bb12, label %bb16

 bb12:
   br label %bb16

 bb16:
   %tmp17 = phi i32 [ 0, %bb10 ], [ 1, %.lr.ph.i ], [ 2, %bb12 ]
   %tmp18 = add nsw i32 %tmp8, 1
   %tmp19 = icmp slt i32 %tmp18, 4
   br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

 f1.exit.loopexit:
   %.lcssa = phi i32 [ %tmp17, %bb16 ]
   ret i32 %.lcssa
 }

 ; more than one incoming value for outside user: %.lcssa
 ; CHECK-LABEL: test4(
 ; CHECK-LABEL: vector.body:
 ; CHECK:          %predphi = select <2 x i1>

 ; CHECK-LABEL: middle.block:
 ; CHECK:          [[E1:%[a-zA-Z0-9.]+]] = extractelement <2 x i32> %predphi, i32 1

 ; CHECK-LABEL: f1.exit.loopexit.loopexit:
 ; CHECK:          %tmp17.lcssa = phi i32 [ %tmp17, %bb16 ], [ [[E1]], %middle.block ]
 ; CHECK-NEXT:     br label %f1.exit.loopexit

 ; CHECK-LABEL: f1.exit.loopexit:
 ; CHECK:          %.lcssa = phi i32 [ 2, %bb ], [ %tmp17.lcssa, %f1.exit.loopexit.loopexit ]
 define i32 @test4(i32 %N)  {
 bb:
   %b.promoted = load i32, i32* @b, align 4
   %icmp = icmp slt i32 %b.promoted, %N
   br i1 %icmp, label %f1.exit.loopexit, label %.lr.ph.i

 .lr.ph.i:
   %tmp8 = phi i32 [ %tmp18, %bb16 ], [ %b.promoted, %bb ]
   %tmp2 = icmp sgt i32 %tmp8, 10
   br i1 %tmp2, label %bb16, label %bb10

 bb10:
   br label %bb16

 bb16:
   %tmp17 = phi i32 [ 0, %bb10 ], [ 1, %.lr.ph.i ]
   %tmp18 = add nsw i32 %tmp8, 1
   %tmp19 = icmp slt i32 %tmp18, 4
   br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

 f1.exit.loopexit:
   %.lcssa = phi i32 [ %tmp17, %bb16 ], [ 2, %bb ]
   ret i32 %.lcssa
 }

 ; non hdr phi that depends on reduction and is used outside the loop.
 ; reduction phis are only allowed to have bump or reduction operations as the inside user, so we should
 ; not vectorize this.
 ; CHECK-LABEL: reduction_sum(
 ; CHECK-NOT: <2 x i32>
 define i32 @reduction_sum(i32 %n, i32* noalias nocapture %A, i32* noalias nocapture %B) nounwind uwtable readonly noinline ssp {
 entry:
   %c1 = icmp sgt i32 %n, 0
   br i1 %c1, label %header, label %._crit_edge

 header:                                           ; preds = %0, %.lr.ph
   %indvars.iv = phi i64 [ %indvars.iv.next, %bb16 ], [ 0, %entry ]
   %sum.02 = phi i32 [ %c9, %bb16 ], [ 0, %entry ]
   %c2 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
   %c3 = load i32, i32* %c2, align 4
   %c4 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
   %c5 = load i32, i32* %c4, align 4
   %tmp2 = icmp sgt i32 %sum.02, 10
   br i1 %tmp2, label %bb16, label %bb10

 bb10:
   br label %bb16

 bb16:
   %tmp17 = phi i32 [ %sum.02, %bb10 ], [ 1, %header ]
   %c6 = trunc i64 %indvars.iv to i32
   %c7 = add i32 %sum.02, %c6
   %c8 = add i32 %c7, %c3
   %c9 = add i32 %c8, %c5
   %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 %._crit_edge, label %header

 ._crit_edge:                                      ; preds = %.lr.ph, %0
   %sum.0.lcssa = phi i32 [ 0, %entry ], [ %c9, %bb16 ]
   %nonhdr.lcssa = phi i32 [ 1, %entry], [ %tmp17, %bb16 ]
   ret i32 %sum.0.lcssa
 }

 ; invalid cyclic dependency with header phi iv, which prevents iv from being
 ; recognized as induction var.
 ; cannot vectorize.
 ; CHECK-LABEL: cyclic_dep_with_indvar(
 ; CHECK-NOT: <2 x i32>
 define i32 @cyclic_dep_with_indvar()  {
 bb:
   %b.promoted = load i32, i32* @b, align 4
   br label %.lr.ph.i

 .lr.ph.i:
   %iv = phi i32 [ %ivnext, %bb16 ], [ %b.promoted, %bb ]
   %tmp2 = icmp sgt i32 %iv, 10
   br i1 %tmp2, label %bb16, label %bb10

 bb10:
   br label %bb16

 bb16:
   %tmp17 = phi i32 [ 0, %bb10 ], [ %iv, %.lr.ph.i ]
   %ivnext = add nsw i32 %tmp17, 1
   %tmp19 = icmp slt i32 %ivnext, 4
   br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

 f1.exit.loopexit:
   %.lcssa = phi i32 [ %tmp17, %bb16 ]
   ret i32 %.lcssa
 }

 ; non-reduction phi 'tmp17' used outside loop has cyclic dependence with %x.05 phi
 ; cannot vectorize.
 ; CHECK-LABEL: not_valid_reduction(
 ; CHECK-NOT: <2 x i32>
 define i32 @not_valid_reduction(i32 %n, i32* noalias nocapture %A) nounwind uwtable readonly {
 entry:
   %cmp4 = icmp sgt i32 %n, 0
   br i1 %cmp4, label %for.body, label %for.end

 for.body:                                         ; preds = %entry, %for.body
   %indvars.iv = phi i64 [ %indvars.iv.next, %latch ], [ 0, %entry ]
   %x.05 = phi i32 [ %tmp17, %latch ], [ 0, %entry ]
   %arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
   %tmp0 = load i32, i32* %arrayidx, align 4
   %tmp2 = icmp sgt i64 %indvars.iv, 10
   %sub = sub nsw i32 %x.05, %tmp0
   br i1 %tmp2, label %bb16, label %bb10

 bb10:
   br label %bb16

 bb16:
   %tmp17 = phi i32 [ 1, %bb10 ], [ %sub, %for.body ]
   br label %latch

 latch:
   %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.body, %entry
   %x.0.lcssa = phi i32 [ 0, %entry ], [ %tmp17 , %latch ]
   ret i32 %x.0.lcssa
 }
	; RUN: opt -S -loop-vectorize -force-vector-interleave=1 -force-vector-width=2 < %s 2>&1 \| FileCheck %s

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

	@f = common global i32 0, align 4
	@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
	@c = common global i32 0, align 4
	@a = common global i32 0, align 4
	@b = common global i32 0, align 4
	@e = common global i32 0, align 4

	; It has a value that is used outside of the loop
	; and is not a recognized reduction variable "tmp17".
	; However, tmp17 is a non-header phi which is an allowed exit.

	; CHECK-LABEL: @test1(
	; CHECK: %vec.ind = phi <2 x i32>
	; CHECK: [[CMP:%[a-zA-Z0-9.]+]] = icmp sgt <2 x i32> %vec.ind, <i32 10, i32 10>
	; CHECK: %predphi = select <2 x i1> [[CMP]], <2 x i32> <i32 1, i32 1>, <2 x i32> zeroinitializer

	; CHECK-LABEL: middle.block:
	; CHECK: [[E1:%[a-zA-Z0-9.]+]] = extractelement <2 x i32> %predphi, i32 1

	; CHECK-LABEL: f1.exit.loopexit:
	; CHECK: %.lcssa = phi i32 [ %tmp17, %bb16 ], [ [[E1]], %middle.block ]

	define i32 @test1() {
	bb:
	%b.promoted = load i32, i32* @b, align 4
	br label %.lr.ph.i

	.lr.ph.i:
	%tmp8 = phi i32 [ %tmp18, %bb16 ], [ %b.promoted, %bb ]
	%tmp2 = icmp sgt i32 %tmp8, 10
	br i1 %tmp2, label %bb16, label %bb10

	bb10:
	br label %bb16

	bb16:
	%tmp17 = phi i32 [ 0, %bb10 ], [ 1, %.lr.ph.i ]
	%tmp18 = add nsw i32 %tmp8, 1
	%tmp19 = icmp slt i32 %tmp18, 4
	br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

	f1.exit.loopexit:
	%.lcssa = phi i32 [ %tmp17, %bb16 ]
	ret i32 %.lcssa
	}

	; non-hdr phi depends on header phi.
	; CHECK-LABEL: @test2(
	; CHECK: %vec.ind = phi <2 x i32>
	; CHECK: [[CMP:%[a-zA-Z0-9.]+]] = icmp sgt <2 x i32> %vec.ind, <i32 10, i32 10>
	; CHECK: %predphi = select <2 x i1> [[CMP]], <2 x i32> <i32 1, i32 1>, <2 x i32> %vec.ind

	; CHECK-LABEL: middle.block:
	; CHECK: [[E1:%[a-zA-Z0-9.]+]] = extractelement <2 x i32> %predphi, i32 1

	; CHECK-LABEL: f1.exit.loopexit:
	; CHECK: %.lcssa = phi i32 [ %tmp17, %bb16 ], [ [[E1]], %middle.block ]
	define i32 @test2() {
	bb:
	%b.promoted = load i32, i32* @b, align 4
	br label %.lr.ph.i

	.lr.ph.i:
	%tmp8 = phi i32 [ %tmp18, %bb16 ], [ %b.promoted, %bb ]
	%tmp2 = icmp sgt i32 %tmp8, 10
	br i1 %tmp2, label %bb16, label %bb10

	bb10:
	br label %bb16

	bb16:
	%tmp17 = phi i32 [ %tmp8, %bb10 ], [ 1, %.lr.ph.i ]
	%tmp18 = add nsw i32 %tmp8, 1
	%tmp19 = icmp slt i32 %tmp18, 4
	br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

	f1.exit.loopexit:
	%.lcssa = phi i32 [ %tmp17, %bb16 ]
	ret i32 %.lcssa
	}

	; more than 2 incoming values for tmp17 phi that is used outside loop.
	; CHECK-LABEL: test3(
	; CHECK-LABEL: vector.body:
	; CHECK: %predphi = select <2 x i1> %{{.*}}, <2 x i32> <i32 1, i32 1>, <2 x i32> zeroinitializer
	; CHECK: %predphi1 = select <2 x i1> %{{.*}}, <2 x i32> <i32 2, i32 2>, <2 x i32> %predphi

	; CHECK-LABEL: middle.block:
	; CHECK: [[E1:%[a-zA-Z0-9.]+]] = extractelement <2 x i32> %predphi1, i32 1

	; CHECK-LABEL: f1.exit.loopexit:
	; CHECK: phi i32 [ %tmp17, %bb16 ], [ [[E1]], %middle.block ]
	define i32 @test3(i32 %N) {
	bb:
	%b.promoted = load i32, i32* @b, align 4
	br label %.lr.ph.i

	.lr.ph.i:
	%tmp8 = phi i32 [ %tmp18, %bb16 ], [ %b.promoted, %bb ]
	%tmp2 = icmp sgt i32 %tmp8, 10
	br i1 %tmp2, label %bb16, label %bb10

	bb10:
	%cmp = icmp sgt i32 %tmp8, %N
	br i1 %cmp, label %bb12, label %bb16

	bb12:
	br label %bb16

	bb16:
	%tmp17 = phi i32 [ 0, %bb10 ], [ 1, %.lr.ph.i ], [ 2, %bb12 ]
	%tmp18 = add nsw i32 %tmp8, 1
	%tmp19 = icmp slt i32 %tmp18, 4
	br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

	f1.exit.loopexit:
	%.lcssa = phi i32 [ %tmp17, %bb16 ]
	ret i32 %.lcssa
	}

	; more than one incoming value for outside user: %.lcssa
	; CHECK-LABEL: test4(
	; CHECK-LABEL: vector.body:
	; CHECK: %predphi = select <2 x i1>

	; CHECK-LABEL: middle.block:
	; CHECK: [[E1:%[a-zA-Z0-9.]+]] = extractelement <2 x i32> %predphi, i32 1

	; CHECK-LABEL: f1.exit.loopexit.loopexit:
	; CHECK: %tmp17.lcssa = phi i32 [ %tmp17, %bb16 ], [ [[E1]], %middle.block ]
	; CHECK-NEXT: br label %f1.exit.loopexit

	; CHECK-LABEL: f1.exit.loopexit:
	; CHECK: %.lcssa = phi i32 [ 2, %bb ], [ %tmp17.lcssa, %f1.exit.loopexit.loopexit ]
	define i32 @test4(i32 %N) {
	bb:
	%b.promoted = load i32, i32* @b, align 4
	%icmp = icmp slt i32 %b.promoted, %N
	br i1 %icmp, label %f1.exit.loopexit, label %.lr.ph.i

	.lr.ph.i:
	%tmp8 = phi i32 [ %tmp18, %bb16 ], [ %b.promoted, %bb ]
	%tmp2 = icmp sgt i32 %tmp8, 10
	br i1 %tmp2, label %bb16, label %bb10

	bb10:
	br label %bb16

	bb16:
	%tmp17 = phi i32 [ 0, %bb10 ], [ 1, %.lr.ph.i ]
	%tmp18 = add nsw i32 %tmp8, 1
	%tmp19 = icmp slt i32 %tmp18, 4
	br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

	f1.exit.loopexit:
	%.lcssa = phi i32 [ %tmp17, %bb16 ], [ 2, %bb ]
	ret i32 %.lcssa
	}

	; non hdr phi that depends on reduction and is used outside the loop.
	; reduction phis are only allowed to have bump or reduction operations as the inside user, so we should
	; not vectorize this.
	; CHECK-LABEL: reduction_sum(
	; CHECK-NOT: <2 x i32>
	define i32 @reduction_sum(i32 %n, i32* noalias nocapture %A, i32* noalias nocapture %B) nounwind uwtable readonly noinline ssp {
	entry:
	%c1 = icmp sgt i32 %n, 0
	br i1 %c1, label %header, label %._crit_edge

	header: ; preds = %0, %.lr.ph
	%indvars.iv = phi i64 [ %indvars.iv.next, %bb16 ], [ 0, %entry ]
	%sum.02 = phi i32 [ %c9, %bb16 ], [ 0, %entry ]
	%c2 = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
	%c3 = load i32, i32* %c2, align 4
	%c4 = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
	%c5 = load i32, i32* %c4, align 4
	%tmp2 = icmp sgt i32 %sum.02, 10
	br i1 %tmp2, label %bb16, label %bb10

	bb10:
	br label %bb16

	bb16:
	%tmp17 = phi i32 [ %sum.02, %bb10 ], [ 1, %header ]
	%c6 = trunc i64 %indvars.iv to i32
	%c7 = add i32 %sum.02, %c6
	%c8 = add i32 %c7, %c3
	%c9 = add i32 %c8, %c5
	%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 %._crit_edge, label %header

	._crit_edge: ; preds = %.lr.ph, %0
	%sum.0.lcssa = phi i32 [ 0, %entry ], [ %c9, %bb16 ]
	%nonhdr.lcssa = phi i32 [ 1, %entry], [ %tmp17, %bb16 ]
	ret i32 %sum.0.lcssa
	}

	; invalid cyclic dependency with header phi iv, which prevents iv from being
	; recognized as induction var.
	; cannot vectorize.
	; CHECK-LABEL: cyclic_dep_with_indvar(
	; CHECK-NOT: <2 x i32>
	define i32 @cyclic_dep_with_indvar() {
	bb:
	%b.promoted = load i32, i32* @b, align 4
	br label %.lr.ph.i

	.lr.ph.i:
	%iv = phi i32 [ %ivnext, %bb16 ], [ %b.promoted, %bb ]
	%tmp2 = icmp sgt i32 %iv, 10
	br i1 %tmp2, label %bb16, label %bb10

	bb10:
	br label %bb16

	bb16:
	%tmp17 = phi i32 [ 0, %bb10 ], [ %iv, %.lr.ph.i ]
	%ivnext = add nsw i32 %tmp17, 1
	%tmp19 = icmp slt i32 %ivnext, 4
	br i1 %tmp19, label %.lr.ph.i, label %f1.exit.loopexit

	f1.exit.loopexit:
	%.lcssa = phi i32 [ %tmp17, %bb16 ]
	ret i32 %.lcssa
	}

	; non-reduction phi 'tmp17' used outside loop has cyclic dependence with %x.05 phi
	; cannot vectorize.
	; CHECK-LABEL: not_valid_reduction(
	; CHECK-NOT: <2 x i32>
	define i32 @not_valid_reduction(i32 %n, i32* noalias nocapture %A) nounwind uwtable readonly {
	entry:
	%cmp4 = icmp sgt i32 %n, 0
	br i1 %cmp4, label %for.body, label %for.end

	for.body: ; preds = %entry, %for.body
	%indvars.iv = phi i64 [ %indvars.iv.next, %latch ], [ 0, %entry ]
	%x.05 = phi i32 [ %tmp17, %latch ], [ 0, %entry ]
	%arrayidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
	%tmp0 = load i32, i32* %arrayidx, align 4
	%tmp2 = icmp sgt i64 %indvars.iv, 10
	%sub = sub nsw i32 %x.05, %tmp0
	br i1 %tmp2, label %bb16, label %bb10

	bb10:
	br label %bb16

	bb16:
	%tmp17 = phi i32 [ 1, %bb10 ], [ %sub, %for.body ]
	br label %latch

	latch:
	%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.body, %entry
	%x.0.lcssa = phi i32 [ 0, %entry ], [ %tmp17 , %latch ]
	ret i32 %x.0.lcssa
	}