; NOTE: Assertions have been autogenerated by utils/update_test_checks.py ; RUN: opt -S -passes=loop-simplify,loop-fusion -debug-only=loop-fusion < %s 2>&1 | FileCheck %s ; REQUIRES: asserts ; CHECK: Safe to sink. @A = common global [100 x i32] zeroinitializer, align 16 define void @sink_preheader(i32 %N) { ; CHECK-LABEL: @sink_preheader( ; CHECK-NEXT: pre1: ; CHECK-NEXT: [[PTR:%.*]] = alloca i32, align 4 ; CHECK-NEXT: br label [[BODY1:%.*]] ; CHECK: body1: ; CHECK-NEXT: [[I:%.*]] = phi i32 [ [[I_NEXT:%.*]], [[BODY1]] ], [ 0, [[PRE1:%.*]] ] ; CHECK-NEXT: [[I2:%.*]] = phi i32 [ [[I_NEXT2:%.*]], [[BODY1]] ], [ 0, [[PRE1]] ] ; CHECK-NEXT: [[I_NEXT]] = add i32 1, [[I]] ; CHECK-NEXT: [[COND:%.*]] = icmp ne i32 [[I]], [[N:%.*]] ; CHECK-NEXT: store i32 3, ptr [[PTR]], align 4 ; CHECK-NEXT: [[I_NEXT2]] = add i32 1, [[I2]] ; CHECK-NEXT: [[COND2:%.*]] = icmp ne i32 [[I2]], [[N]] ; CHECK-NEXT: br i1 [[COND2]], label [[BODY1]], label [[EXIT:%.*]] ; CHECK: exit: ; CHECK-NEXT: [[B:%.*]] = load i32, ptr [[PTR]], align 4 ; CHECK-NEXT: ret void ; pre1: %ptr = alloca i32 br label %body1 body1: ; preds = %pre1, %body1 %i = phi i32 [%i_next, %body1], [0, %pre1] %i_next = add i32 1, %i %cond = icmp ne i32 %i, %N store i32 3, ptr %ptr br i1 %cond, label %body1, label %pre2 pre2: %b = load i32, ptr %ptr br label %body2 body2: ; preds = %pre2, %body2 %i2 = phi i32 [%i_next2, %body2], [0, %pre2] %i_next2 = add i32 1, %i2 %cond2 = icmp ne i32 %i2, %N br i1 %cond2, label %body2, label %exit exit: ret void }