1 ; RUN: opt -S -passes=loop-simplify,loop-fusion -debug-only=loop-fusion < %s 2>&1 | FileCheck %s
4 @A = common global [100 x i32] zeroinitializer, align 16
5 define void @sink_preheader(i32 %N) {
6 ; CHECK-LABEL: @sink_preheader(
8 ; CHECK-NEXT: [[PTR:%.*]] = alloca i32, align 4
9 ; CHECK-NEXT: br label [[BODY1:%.*]]
11 ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[BODY1]] ], [ 0, [[PRE1:%.*]] ]
12 ; CHECK-NEXT: [[I2:%.*]] = phi i32 [ [[I_NEXT2:%.*]], [[BODY1]] ], [ 0, [[PRE1]] ]
13 ; CHECK-NEXT: [[I_NEXT]] = add i32 1, [[I]]
14 ; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[I]], [[N:%.*]]
15 ; CHECK-NEXT: [[B:%.*]] = load i32, ptr [[PTR]], align 4
16 ; CHECK-NEXT: [[I_NEXT2]] = add i32 1, [[I2]]
17 ; CHECK-NEXT: [[COND2:%.*]] = icmp ne i32 [[I2]], [[N]]
18 ; CHECK-NEXT: br i1 [[COND2]], label [[BODY1]], label [[EXIT:%.*]]
20 ; CHECK-NEXT: store i32 3, ptr [[PTR]], align 4
21 ; CHECK-NEXT: ret void
27 body1: ; preds = %pre1, %body1
28 %i = phi i32 [%i_next, %body1], [0, %pre1]
29 %i_next = add i32 1, %i
30 %cond = icmp ne i32 %i, %N
31 %b = load i32, ptr %ptr
32 br i1 %cond, label %body1, label %pre2
38 body2: ; preds = %pre2, %body2
39 %i2 = phi i32 [%i_next2, %body2], [0, %pre2]
40 %i_next2 = add i32 1, %i2
41 %cond2 = icmp ne i32 %i2, %N
42 br i1 %cond2, label %body2, label %exit