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Imported Upstream version 5.18.0.167
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; RUN: opt < %s -basicaa -loop-interchange -S | FileCheck %s
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;; We test the complete .ll for adjustment in outer loop header/latch and inner loop header/latch.
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@A = common global [100 x [100 x i32]] zeroinitializer
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declare void @foo(i64 %a)
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declare void @bar(i64 %a) readnone
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;;--------------------------------------Test case 01------------------------------------
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;; Not safe to interchange, because the called function `foo` is not marked as
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;; readnone, so it could introduce dependences.
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;;
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;; for(int i=0;i<N;i++) {
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;; for(int j=1;j<N;j++) {
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;; foo(i);
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;; A[j][i] = A[j][i]+k;
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;; }
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;; }
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define void @interchange_01(i32 %k, i32 %N) {
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entry:
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%cmp21 = icmp sgt i32 %N, 0
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br i1 %cmp21, label %for1.ph, label %exit
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for1.ph:
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%cmp219 = icmp sgt i32 %N, 1
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%0 = add i32 %N, -1
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br label %for1.header
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for1.header:
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%indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ]
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br i1 %cmp219, label %for2.ph, label %for1.inc10
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for2.ph:
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br label %for2
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for2:
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%indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for2.ph ]
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call void @foo(i64 %indvars.iv23)
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%arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23
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%1 = load i32, i32* %arrayidx5
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%add = add nsw i32 %1, %k
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store i32 %add, i32* %arrayidx5
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %0
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br i1 %exitcond, label %for2.loopexit , label %for2
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for2.loopexit:
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br label %for1.inc10
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for1.inc10:
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%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
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%lftr.wideiv25 = trunc i64 %indvars.iv23 to i32
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%exitcond26 = icmp eq i32 %lftr.wideiv25, %0
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br i1 %exitcond26, label %for1.loopexit, label %for1.header
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for1.loopexit:
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @interchange_01
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; CHECK: for1.ph:
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; CHECK: br label %for1.header
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; CHECK: for1.header:
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; CHECK-NEXT: %indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ]
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; CHECK-NEXT: br i1 %cmp219, label %for2.ph, label %for1.inc10
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; CHECK: for2:
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; CHECK: br i1 %exitcond, label %for2.loopexit, label %for2
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; CHECK: for1.inc10:
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; CHECK: br i1 %exitcond26, label %for1.loopexit, label %for1.header
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; CHECK: for1.loopexit:
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; CHECK-NEXT: br label %exit
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;;--------------------------------------Test case 02------------------------------------
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;; Safe to interchange, because the called function `bar` is marked as readnone,
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;; so it cannot introduce dependences.
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;;
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;; for(int i=0;i<N;i++) {
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;; for(int j=1;j<N;j++) {
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;; bar(i);
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;; A[j][i] = A[j][i]+k;
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;; }
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;; }
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define void @interchange_02(i32 %k, i32 %N) {
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entry:
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%cmp21 = icmp sgt i32 %N, 0
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br i1 %cmp21, label %for1.ph, label %exit
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for1.ph:
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%cmp219 = icmp sgt i32 %N, 1
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%0 = add i32 %N, -1
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br label %for1.header
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for1.header:
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%indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ]
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br i1 %cmp219, label %for2.ph, label %for1.inc10
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for2.ph:
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br label %for2
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for2:
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%indvars.iv = phi i64 [ %indvars.iv.next, %for2 ], [ 1, %for2.ph ]
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call void @bar(i64 %indvars.iv23)
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%arrayidx5 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv, i64 %indvars.iv23
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%1 = load i32, i32* %arrayidx5
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%add = add nsw i32 %1, %k
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store i32 %add, i32* %arrayidx5
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%lftr.wideiv = trunc i64 %indvars.iv to i32
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%exitcond = icmp eq i32 %lftr.wideiv, %0
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br i1 %exitcond, label %for2.loopexit , label %for2
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for2.loopexit:
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br label %for1.inc10
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for1.inc10:
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%indvars.iv.next24 = add nuw nsw i64 %indvars.iv23, 1
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%lftr.wideiv25 = trunc i64 %indvars.iv23 to i32
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%exitcond26 = icmp eq i32 %lftr.wideiv25, %0
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br i1 %exitcond26, label %for1.loopexit, label %for1.header
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for1.loopexit:
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br label %exit
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exit:
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ret void
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}
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; CHECK-LABEL: @interchange_02
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; CHECK: for1.header:
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; CHECK-NEXT: %indvars.iv23 = phi i64 [ 0, %for1.ph ], [ %indvars.iv.next24, %for1.inc10 ]
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; CHECK-NEXT: br i1 %cmp219, label %for2.split1, label %for1.loopexit
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; CHECK: for2.split1:
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; CHECK: br label %for2.loopexit
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; CHECK: for2.split:
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; CHECK-NEXT: %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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; CHECK: br i1 %exitcond, label %for1.loopexit, label %for2
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; CHECK: for2.loopexit:
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; CHECK-NEXT: br label %for1.inc10
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; CHECK: for1.inc10:
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; CHECK: br i1 %exitcond26, label %for2.split, label %for1.header
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