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Imported Upstream version 5.18.0.167
Former-commit-id: 289509151e0fee68a1b591a20c9f109c3c789d3a
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; RUN: opt -loop-load-elim -S < %s | FileCheck %s
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; The accesses to A are independent here but LAA reports it as a loop-carried
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; forward dependence. Check that we don't perform st->ld forwarding between
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; them.
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;
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; for (unsigned i = 0; i < 100; i++) {
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; A[i][1] = B[i] + 2;
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; C[i] = A[i][0] * 2;
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; }
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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define void @f([2 x i32]* noalias %A, i32* noalias %B, i32* noalias %C, i64 %N) {
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entry:
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br label %for.body
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for.body: ; preds = %for.body, %entry
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%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
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%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
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%A1idx = getelementptr inbounds [2 x i32], [2 x i32]* %A, i64 %indvars.iv, i32 1
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%Bidx = getelementptr inbounds i32, i32* %B, i64 %indvars.iv
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%Cidx = getelementptr inbounds i32, i32* %C, i64 %indvars.iv
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%A0idx = getelementptr inbounds [2 x i32], [2 x i32]* %A, i64 %indvars.iv, i32 0
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%b = load i32, i32* %Bidx, align 4
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%a_p1 = add i32 %b, 2
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store i32 %a_p1, i32* %A1idx, align 4
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; CHECK: %a = load i32, i32* %A0idx, align 4
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%a = load i32, i32* %A0idx, align 4
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; CHECK: %c = mul i32 %a, 2
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%c = mul i32 %a, 2
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store i32 %c, i32* %Cidx, align 4
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%exitcond = icmp eq i64 %indvars.iv.next, %N
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br i1 %exitcond, label %for.end, label %for.body
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for.end: ; preds = %for.body
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ret void
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}
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