| ; RUN: opt -S -loop-fusion < %s | FileCheck %s |
| ; |
| ; int A[1024][1024]; |
| ; int B[1024][1024]; |
| ; |
| ; #define EXPENSIVE_PURE_COMPUTATION(i) ((i - 3) * (i + 3) % i) |
| ; |
| ; void dep_free() { |
| ; |
| ; for (int i = 0; i < 100; i++) |
| ; for (int j = 0; j < 100; j++) |
| ; A[i][j] = EXPENSIVE_PURE_COMPUTATION(i); |
| ; |
| ; for (int i = 0; i < 100; i++) |
| ; for (int j = 0; j < 100; j++) |
| ; B[i][j] = EXPENSIVE_PURE_COMPUTATION(i); |
| ; } |
| ; |
| @A = common global [1024 x [1024 x i32]] zeroinitializer, align 16 |
| @B = common global [1024 x [1024 x i32]] zeroinitializer, align 16 |
| |
| ; CHECK: void @dep_free |
| ; CHECK-NEXT: bb: |
| ; CHECK-NEXT: br label %[[LOOP1HEADER:bb[0-9]+]] |
| ; CHECK: [[LOOP1HEADER]] |
| ; CHECK: br i1 %exitcond12, label %[[LOOP3PREHEADER:bb[0-9]+.preheader]], label %[[LOOP2HEADER:bb[0-9]+]] |
| ; CHECK: [[LOOP3PREHEADER]] |
| ; CHECK: br label %[[LOOP3HEADER:bb[0-9]+]] |
| ; CHECK: [[LOOP3HEADER]] |
| ; CHECK: br i1 %exitcond9, label %[[LOOP3BODY:bb[0-9]+]], label %[[LOOP1LATCH:bb[0-9]+]] |
| ; CHECK: [[LOOP1LATCH]] |
| ; CHECK: br label %[[LOOP2HEADER:bb[0-9]+]] |
| ; CHECK: [[LOOP2HEADER]] |
| ; CHECK: br i1 %exitcond6, label %[[LOOP4PREHEADER:bb[0-9]+.preheader]], label %[[LOOP2EXITBLOCK:bb[0-9]+]] |
| ; CHECK: [[LOOP4PREHEADER]] |
| ; CHECK: br label %[[LOOP4HEADER:bb[0-9]+]] |
| ; CHECK: [[LOOP2EXITBLOCK]] |
| ; CHECK-NEXT: br label %[[FUNCEXIT:bb[0-9]+]] |
| ; CHECK: [[LOOP4HEADER]] |
| ; CHECK: br i1 %exitcond, label %[[LOOP4BODY:bb[0-9]+]], label %[[LOOP2LATCH:bb[0-9]+]] |
| ; CHECK: [[LOOP2LATCH]] |
| ; CHECK: br label %[[LOOP1HEADER:bb[0-9]+]] |
| ; CHECK: [[FUNCEXIT]] |
| ; CHECK: ret void |
| |
| ; TODO: The current version of loop fusion does not allow the inner loops to be |
| ; fused because they are not control flow equivalent and adjacent. These are |
| ; limitations that can be addressed in future improvements to fusion. |
| define void @dep_free() { |
| bb: |
| br label %bb13 |
| |
| bb13: ; preds = %bb27, %bb |
| %indvars.iv10 = phi i64 [ %indvars.iv.next11, %bb27 ], [ 0, %bb ] |
| %.0 = phi i32 [ 0, %bb ], [ %tmp28, %bb27 ] |
| %exitcond12 = icmp ne i64 %indvars.iv10, 100 |
| br i1 %exitcond12, label %bb16, label %bb30 |
| |
| bb16: ; preds = %bb25, %bb13 |
| %indvars.iv7 = phi i64 [ %indvars.iv.next8, %bb25 ], [ 0, %bb13 ] |
| %exitcond9 = icmp ne i64 %indvars.iv7, 100 |
| br i1 %exitcond9, label %bb18, label %bb27 |
| |
| bb18: ; preds = %bb16 |
| %tmp = add nsw i32 %.0, -3 |
| %tmp19 = add nuw nsw i64 %indvars.iv10, 3 |
| %tmp20 = trunc i64 %tmp19 to i32 |
| %tmp21 = mul nsw i32 %tmp, %tmp20 |
| %tmp22 = trunc i64 %indvars.iv10 to i32 |
| %tmp23 = srem i32 %tmp21, %tmp22 |
| %tmp24 = getelementptr inbounds [1024 x [1024 x i32]], [1024 x [1024 x i32]]* @A, i64 0, i64 %indvars.iv10, i64 %indvars.iv7 |
| store i32 %tmp23, i32* %tmp24, align 4 |
| br label %bb25 |
| |
| bb25: ; preds = %bb18 |
| %indvars.iv.next8 = add nuw nsw i64 %indvars.iv7, 1 |
| br label %bb16 |
| |
| bb27: ; preds = %bb16 |
| %indvars.iv.next11 = add nuw nsw i64 %indvars.iv10, 1 |
| %tmp28 = add nuw nsw i32 %.0, 1 |
| br label %bb13 |
| |
| bb30: ; preds = %bb45, %bb13 |
| %indvars.iv4 = phi i64 [ %indvars.iv.next5, %bb45 ], [ 0, %bb13 ] |
| %.02 = phi i32 [ 0, %bb13 ], [ %tmp46, %bb45 ] |
| %exitcond6 = icmp ne i64 %indvars.iv4, 100 |
| br i1 %exitcond6, label %bb33, label %bb31 |
| |
| bb31: ; preds = %bb30 |
| br label %bb47 |
| |
| bb33: ; preds = %bb43, %bb30 |
| %indvars.iv = phi i64 [ %indvars.iv.next, %bb43 ], [ 0, %bb30 ] |
| %exitcond = icmp ne i64 %indvars.iv, 100 |
| br i1 %exitcond, label %bb35, label %bb45 |
| |
| bb35: ; preds = %bb33 |
| %tmp36 = add nsw i32 %.02, -3 |
| %tmp37 = add nuw nsw i64 %indvars.iv4, 3 |
| %tmp38 = trunc i64 %tmp37 to i32 |
| %tmp39 = mul nsw i32 %tmp36, %tmp38 |
| %tmp40 = trunc i64 %indvars.iv4 to i32 |
| %tmp41 = srem i32 %tmp39, %tmp40 |
| %tmp42 = getelementptr inbounds [1024 x [1024 x i32]], [1024 x [1024 x i32]]* @B, i64 0, i64 %indvars.iv4, i64 %indvars.iv |
| store i32 %tmp41, i32* %tmp42, align 4 |
| br label %bb43 |
| |
| bb43: ; preds = %bb35 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| br label %bb33 |
| |
| bb45: ; preds = %bb33 |
| %indvars.iv.next5 = add nuw nsw i64 %indvars.iv4, 1 |
| %tmp46 = add nuw nsw i32 %.02, 1 |
| br label %bb30 |
| |
| bb47: ; preds = %bb31 |
| ret void |
| } |