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test/Transforms/LoopInterchange/currentLimitation.ll
| ; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s | |||||
| ;; These are test that fail to interchange due to current limitation. This will go off once we extend the loop interchange pass. | |||||
| 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 | |||||
| @B = common global [100 x [100 x [100 x i32]]] zeroinitializer | |||||
| ;;--------------------------------------Test case 01------------------------------------ | |||||
| ;; [FIXME] This loop though valid is currently not interchanged due to the limitation that we cannot split the inner loop latch due to multiple use of inner induction | |||||
| ;; variable.(used to increment the loop counter and to access A[j+1][i+1] | |||||
| ;; for(int i=0;i<N-1;i++) | |||||
| ;; for(int j=1;j<N-1;j++) | |||||
| ;; A[j+1][i+1] = A[j+1][i+1] + k; | |||||
| define void @interchange_01(i32 %k, i32 %N) { | |||||
| entry: | |||||
| %sub = add nsw i32 %N, -1 | |||||
| %cmp26 = icmp sgt i32 %N, 1 | |||||
| br i1 %cmp26, label %for.cond1.preheader.lr.ph, label %for.end17 | |||||
| for.cond1.preheader.lr.ph: | |||||
| %cmp324 = icmp sgt i32 %sub, 1 | |||||
| %0 = add i32 %N, -2 | |||||
| %1 = sext i32 %sub to i64 | |||||
| br label %for.cond1.preheader | |||||
| for.cond.loopexit: | |||||
| %cmp = icmp slt i64 %indvars.iv.next29, %1 | |||||
| br i1 %cmp, label %for.cond1.preheader, label %for.end17 | |||||
| for.cond1.preheader: | |||||
| %indvars.iv28 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next29, %for.cond.loopexit ] | |||||
| %indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1 | |||||
| br i1 %cmp324, label %for.body4, label %for.cond.loopexit | |||||
| for.body4: | |||||
| %indvars.iv = phi i64 [ %indvars.iv.next, %for.body4 ], [ 1, %for.cond1.preheader ] | |||||
| %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 | |||||
| %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next, i64 %indvars.iv.next29 | |||||
| %2 = load i32, i32* %arrayidx7 | |||||
| %add8 = add nsw i32 %2, %k | |||||
| store i32 %add8, i32* %arrayidx7 | |||||
| %lftr.wideiv = trunc i64 %indvars.iv to i32 | |||||
| %exitcond = icmp eq i32 %lftr.wideiv, %0 | |||||
| br i1 %exitcond, label %for.cond.loopexit, label %for.body4 | |||||
| for.end17: | |||||
| ret void | |||||
| } | |||||
| ;; Inner loop not split so it is not interchanged. | |||||
| ; CHECK-LABEL: @interchange_01 | |||||
| ; CHECK: for.body4: | |||||
| ; CHECK-NEXT: %indvars.iv = phi i64 [ %indvars.iv.next, %for.body4 ], [ 1, %for.body4.preheader ] | |||||
| ; CHECK-NEXT: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 | |||||
| ; CHECK-NEXT: %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next, i64 %indvars.iv.next29 | |||||