| ; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s |
| ;; We test the complete .ll for adjustment in outer loop header/latch and inner loop header/latch. |
| |
| target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128" |
| target triple = "x86_64-unknown-linux-gnu" |
| |
| @A = common global [100 x [100 x i32]] zeroinitializer |
| |
| declare void @foo(i64 %a) |
| declare void @bar(i64 %a) readnone |
| |
| ;;--------------------------------------Test case 01------------------------------------ |
| ;; Not safe to interchange, because the called function `foo` is not marked as |
| ;; readnone, so it could introduce dependences. |
| ;; |
| ;; for(int i=0;i<N;i++) { |
| ;; for(int j=1;j<N;j++) { |
| ;; foo(i); |
| ;; A[j][i] = A[j][i]+k; |
| ;; } |
| ;; } |
| |
| define void @interchange_01(i32 %k, i32 %N) { |
| entry: |
| %cmp21 = icmp sgt i32 %N, 0 |
| br i1 %cmp21, label %for1.ph, label %exit |
| |
| for1.ph: |
| %cmp219 = icmp sgt i32 %N, 1 |
| %0 = add i32 %N, -1 |
| br label %for1.header |
| |
| for1.header: |
| %indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ] |
| br i1 %cmp219, label %for2.ph, label %for1.inc10 |
| |
| for2.ph: |
| br label %for2 |
| |
| for2: |
| %indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for2.ph ] |
| call void @foo(i64 %indvars.iv23) |
| %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23 |
| %1 = load i32, i32* %arrayidx5 |
| %add = add nsw i32 %1, %k |
| store i32 %add, i32* %arrayidx5 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %lftr.wideiv = trunc i64 %indvars.iv to i32 |
| %exitcond = icmp eq i32 %lftr.wideiv, %0 |
| br i1 %exitcond, label %for2.loopexit , label %for2 |
| |
| for2.loopexit: |
| br label %for1.inc10 |
| |
| for1.inc10: |
| %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1 |
| %lftr.wideiv25 = trunc i64 %indvars.iv23 to i32 |
| %exitcond26 = icmp eq i32 %lftr.wideiv25, %0 |
| br i1 %exitcond26, label %for1.loopexit, label %for1.header |
| |
| for1.loopexit: |
| br label %exit |
| |
| exit: |
| ret void |
| } |
| |
| ; CHECK-LABEL: @interchange_01 |
| ; CHECK: for1.ph: |
| ; CHECK: br label %for1.header |
| |
| ; CHECK: for1.header: |
| ; CHECK-NEXT: %indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ] |
| ; CHECK-NEXT: br i1 %cmp219, label %for2.ph, label %for1.inc10 |
| |
| ; CHECK: for2: |
| ; CHECK: br i1 %exitcond, label %for2.loopexit, label %for2 |
| |
| ; CHECK: for1.inc10: |
| ; CHECK: br i1 %exitcond26, label %for1.loopexit, label %for1.header |
| |
| ; CHECK: for1.loopexit: |
| ; CHECK-NEXT: br label %exit |
| |
| |
| ;;--------------------------------------Test case 02------------------------------------ |
| ;; Safe to interchange, because the called function `bar` is marked as readnone, |
| ;; so it cannot introduce dependences. |
| ;; |
| ;; for(int i=0;i<N;i++) { |
| ;; for(int j=1;j<N;j++) { |
| ;; bar(i); |
| ;; A[j][i] = A[j][i]+k; |
| ;; } |
| ;; } |
| |
| define void @interchange_02(i32 %k, i32 %N) { |
| entry: |
| %cmp21 = icmp sgt i32 %N, 0 |
| br i1 %cmp21, label %for1.ph, label %exit |
| |
| for1.ph: |
| %cmp219 = icmp sgt i32 %N, 1 |
| %0 = add i32 %N, -1 |
| br label %for1.header |
| |
| for1.header: |
| %indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ] |
| br i1 %cmp219, label %for2.ph, label %for1.inc10 |
| |
| for2.ph: |
| br label %for2 |
| |
| for2: |
| %indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for2.ph ] |
| call void @bar(i64 %indvars.iv23) |
| %arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23 |
| %1 = load i32, i32* %arrayidx5 |
| %add = add nsw i32 %1, %k |
| store i32 %add, i32* %arrayidx5 |
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| %lftr.wideiv = trunc i64 %indvars.iv to i32 |
| %exitcond = icmp eq i32 %lftr.wideiv, %0 |
| br i1 %exitcond, label %for2.loopexit , label %for2 |
| |
| for2.loopexit: |
| br label %for1.inc10 |
| |
| for1.inc10: |
| %indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1 |
| %lftr.wideiv25 = trunc i64 %indvars.iv23 to i32 |
| %exitcond26 = icmp eq i32 %lftr.wideiv25, %0 |
| br i1 %exitcond26, label %for1.loopexit, label %for1.header |
| |
| for1.loopexit: |
| br label %exit |
| |
| exit: |
| ret void |
| } |
| |
| ; CHECK-LABEL: @interchange_02 |
| ; CHECK: for1.header: |
| ; CHECK-NEXT: %indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ] |
| ; CHECK-NEXT: br i1 %cmp219, label %for2.split1, label %for1.loopexit |
| |
| ; CHECK: for2.split1: |
| ; CHECK: br label %for2.loopexit |
| |
| ; CHECK: for2.split: |
| ; CHECK-NEXT: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 |
| ; CHECK: br i1 %exitcond, label %for1.loopexit, label %for2 |
| |
| ; CHECK: for2.loopexit: |
| ; CHECK-NEXT: br label %for1.inc10 |
| |
| ; CHECK: for1.inc10: |
| ; CHECK: br i1 %exitcond26, label %for2.split, label %for1.header |