49 lines
2.0 KiB
LLVM
49 lines
2.0 KiB
LLVM
; RUN: opt < %s -basic-aa -loop-interchange -verify-dom-info -verify-loop-info \
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; RUN: -S -pass-remarks=loop-interchange 2>&1 | FileCheck %s
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@A10 = local_unnamed_addr global [3 x [3 x i32]] zeroinitializer, align 16
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;; Test to make sure we can handle zext instructions introduced by
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;; IndVarSimplify.
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;;
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;; for (int i = 0; i < 2; ++i)
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;; for(int j = 0; j < n; ++j) {
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;; A[j][i] = i;
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;; }
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; CHECK: Loop interchanged with enclosing loop.
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@A11 = local_unnamed_addr global [3 x [3 x i32]] zeroinitializer, align 16
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define void @interchange_11(i32 %n) {
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entry:
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br label %for.cond1.preheader
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for.cond.loopexit: ; preds = %for.body4
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%exitcond28 = icmp ne i64 %indvars.iv.next27, 2
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br i1 %exitcond28, label %for.cond1.preheader, label %for.cond.cleanup
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for.cond1.preheader: ; preds = %for.cond.loopexit, %entry
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%indvars.iv26 = phi i64 [ 0, %entry ], [ %indvars.iv.next27, %for.cond.loopexit ]
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%indvars.iv.next27 = add nuw nsw i64 %indvars.iv26, 1
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br label %for.body4
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for.cond.cleanup: ; preds = %for.cond.loopexit
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ret void
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for.body4: ; preds = %for.body4, %for.cond1.preheader
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%indvars.iv = phi i64 [ 0, %for.cond1.preheader ], [ %indvars.iv.next, %for.body4 ]
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; The store below does not appear in the C snippet above.
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; With two stores in the loop there may be WAW dependences, and interchange is illegal.
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; %arrayidx6 = getelementptr inbounds [3 x [3 x i32]], [3 x [3 x i32]]* @A10, i64 0, i64 %indvars.iv, i64 %indvars.iv26
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; %tmp = trunc i64 %indvars.iv26 to i32
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; store i32 %tmp, i32* %arrayidx6, align 4
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%arrayidx10 = getelementptr inbounds [3 x [3 x i32]], [3 x [3 x i32]]* @A10, i64 0, i64 %indvars.iv, i64 %indvars.iv.next27
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%tmp1 = trunc i64 %indvars.iv to i32
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store i32 %tmp1, i32* %arrayidx10, align 4
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%n.wide = zext i32 %n to i64
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%exitcond = icmp ne i64 %indvars.iv.next, %n.wide
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br i1 %exitcond, label %for.body4, label %for.cond.loopexit
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}
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