| ; RUN: opt -S -passes=loop-simplify,loop-fusion -debug-only=loop-fusion < %s 2>&1 | FileCheck %s |
| ; REQUIRES: asserts |
| ; CHECK: Safe to hoist. |
| |
| @A = common global [100 x i32] zeroinitializer, align 16 |
| define void @hoist_preheader(i32 %N) { |
| ; CHECK-LABEL: @hoist_preheader( |
| ; CHECK-NEXT: pre1: |
| ; CHECK-NEXT: [[PTR:%.*]] = alloca i32, align 4 |
| ; CHECK-NEXT: store i32 3, ptr [[PTR]], 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: [[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: 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 |
| br i1 %cond, label %body1, label %pre2 |
| |
| pre2: |
| store i32 3, 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 |
| } |