1; RUN: opt -S -passes=loop-simplify,loop-fusion -debug-only=loop-fusion < %s 2>&1 | FileCheck %s 2; REQUIRES: asserts 3; CHECK: Safe to hoist. 4 5@A = common global [100 x i32] zeroinitializer, align 16 6define void @hoist_preheader(i32 %N) { 7; CHECK-LABEL: @hoist_preheader( 8; CHECK-NEXT: pre1: 9; CHECK-NEXT: [[PTR:%.*]] = alloca i32, align 4 10; CHECK-NEXT: [[B:%.*]] = load i32, ptr [[PTR]], align 4 11; CHECK-NEXT: br label [[BODY1:%.*]] 12; CHECK: body1: 13; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[BODY1]] ], [ 0, [[PRE1:%.*]] ] 14; CHECK-NEXT: [[I2:%.*]] = phi i32 [ [[I_NEXT2:%.*]], [[BODY1]] ], [ 0, [[PRE1]] ] 15; CHECK-NEXT: [[I_NEXT]] = add i32 1, [[I]] 16; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[I]], [[N:%.*]] 17; CHECK-NEXT: [[I_NEXT2]] = add i32 1, [[I2]] 18; CHECK-NEXT: [[COND2:%.*]] = icmp ne i32 [[I2]], [[N]] 19; CHECK-NEXT: br i1 [[COND2]], label [[BODY1]], label [[EXIT:%.*]] 20; CHECK: exit: 21; CHECK-NEXT: ret void 22; 23pre1: 24 %ptr = alloca i32 25 br label %body1 26 27body1: ; 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 br i1 %cond, label %body1, label %pre2 32 33pre2: 34 %b = load i32, ptr %ptr 35 br label %body2 36 37body2: ; preds = %pre2, %body2 38 %i2 = phi i32 [%i_next2, %body2], [0, %pre2] 39 %i_next2 = add i32 1, %i2 40 %cond2 = icmp ne i32 %i2, %N 41 br i1 %cond2, label %body2, label %exit 42 43exit: 44 ret void 45} 46