derek.holloway
7502bf64a4
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113 lines
3.3 KiB
LLVM
113 lines
3.3 KiB
LLVM
; RUN: opt -passes='print<access-info>' -aa-pipeline='basic-aa' -disable-output < %s 2>&1 | FileCheck %s
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.10.0"
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; TODO: Loop iteration counts are only required if we generate memory
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; runtime checks. Missing iteration counts should not prevent
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; analysis, if no runtime checks are required.
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; No memory checks are required, because base pointers do not alias and we have
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; a forward dependence for %a.
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define void @safe_forward_dependence(ptr noalias %a,
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ptr noalias %b) {
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; CHECK-LABEL: safe_forward_dependence
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; CHECK: for.body:
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; CHECK-NEXT: Report: could not determine number of loop iterations
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;
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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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%iv = phi i64 [ 0, %entry ], [ %iv.next, %for.body ]
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%iv.next = add nuw nsw i64 %iv, 1
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%arrayidxA_plus_2 = getelementptr inbounds i16, ptr %a, i64 %iv.next
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%loadA_plus_2 = load i16, ptr %arrayidxA_plus_2, align 2
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%arrayidxB = getelementptr inbounds i16, ptr %b, i64 %iv
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%loadB = load i16, ptr %arrayidxB, align 2
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%mul = mul i16 %loadB, %loadA_plus_2
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%arrayidxA = getelementptr inbounds i16, ptr %a, i64 %iv
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store i16 %mul, ptr %arrayidxA, align 2
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%exitcond = icmp eq i16 %loadB, 20
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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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define void @unsafe_backwards_dependence(ptr noalias %a,
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ptr noalias %b) {
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; CHECK-LABEL: unsafe_backwards_dependence
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; CHECK: for.body:
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; CHECK-NEXT: Report: could not determine number of loop iterations
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;
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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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%iv = phi i64 [ 1, %entry ], [ %iv.next, %for.body ]
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%idx = add nuw nsw i64 %iv, -1
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%iv.next = add nuw nsw i64 %iv, 1
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%arrayidxA_plus_2 = getelementptr inbounds i16, ptr %a, i64 %idx
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%loadA_plus_2 = load i16, ptr %arrayidxA_plus_2, align 2
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%arrayidxB = getelementptr inbounds i16, ptr %b, i64 %iv
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%loadB = load i16, ptr %arrayidxB, align 2
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%mul = mul i16 %loadB, %loadA_plus_2
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%arrayidxA = getelementptr inbounds i16, ptr %a, i64 %iv
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store i16 %mul, ptr %arrayidxA, align 2
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%exitcond = icmp eq i16 %loadB, 20
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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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define void @ptr_may_alias(ptr %a, ptr %b) {
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; CHECK-LABEL: ptr_may_alias
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; CHECK: for.body:
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; CHECK-NEXT: Report: could not determine number of loop iterations
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;
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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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%iv = phi i64 [ 1, %entry ], [ %iv.next, %for.body ]
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%idx = add nuw nsw i64 %iv, -1
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%iv.next = add nuw nsw i64 %iv, 1
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%arrayidxA = getelementptr inbounds i16, ptr %a, i64 %iv
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%loadA = load i16, ptr %arrayidxA, align 2
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%arrayidxB = getelementptr inbounds i16, ptr %b, i64 %iv
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%loadB = load i16, ptr %arrayidxB, align 2
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%mul = mul i16 %loadB, %loadA
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store i16 %mul, ptr %arrayidxA, align 2
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%exitcond = icmp eq i16 %loadB, 20
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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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