forked from OSchip/llvm-project
[LAA] Add tests with uncomputable BTCs.
This commit is contained in:
Florian Hahn
parent
d9f306aa52
commit
4a17b9a39b
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@ -1,5 +1,5 @@
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; RUN: opt -loop-accesses -analyze -enable-new-pm=0 < %s | FileCheck %s
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; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output < %s 2>&1 | FileCheck %s
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; RUN: opt -aa-pipeline=basic-aa -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -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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@ -10,15 +10,16 @@ target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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; for (i = 0; i < 20; ++i)
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; A[i*i] *= 2;
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; CHECK: for.body:
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; CHECK: Report: unsafe dependent memory operations in loop
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; CHECK-NOT: Report: cannot identify array bounds
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; CHECK: Dependences:
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; CHECK: Unknown:
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; CHECK: %loadA = load i16, i16* %arrayidxA, align 2 ->
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; CHECK: store i16 %mul, i16* %arrayidxA, align 2
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; CHECK-LABEL: addrec_squared
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; CHECK-NEXT: for.body:
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; CHECK-NEXT: Report: unsafe dependent memory operations in loop
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; CHECK-NOT: Report: cannot identify array bounds
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; CHECK-NEXT: Dependences:
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; CHECK-NEXT: Unknown:
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; CHECK-NEXT: %loadA = load i16, i16* %arrayidxA, align 2 ->
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; CHECK-NEXT: store i16 %mul, i16* %arrayidxA, align 2
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define void @f(i16* %a) {
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define void @addrec_squared(i16* %a) {
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entry:
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br label %for.body
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@ -41,3 +42,39 @@ for.body: ; preds = %for.body, %entry
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for.end: ; preds = %for.body
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ret void
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}
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; TODO: We cannot compute the bound for %arrayidxA_ub, because the index is
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; loaded on each iteration. As %a and %b are no-alias, no memchecks are required
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; and unknown bounds should not prevent further analysis.
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define void @loaded_bound(i16* noalias %a, i16* noalias %b) {
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; CHECK-LABEL: loaded_bound
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; CHECK-NEXT: for.body:
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; CHECK-NEXT: Report: cannot identify array bounds
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; CHECK-NEXT: Dependences:
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; CHECK-NEXT: Run-time memory checks:
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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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%arrayidxB = getelementptr inbounds i16, i16* %b, i64 %iv
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%loadB = load i16, i16* %arrayidxB, align 2
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%arrayidxA_ub = getelementptr inbounds i16, i16* %a, i16 %loadB
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%loadA_ub = load i16, i16* %arrayidxA_ub, align 2
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%mul = mul i16 %loadB, %loadA_ub
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%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %iv
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store i16 %mul, i16* %arrayidxA, align 2
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%exitcond = icmp eq i64 %iv, 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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@ -0,0 +1,113 @@
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; RUN: opt -basic-aa -loop-accesses -analyze -enable-new-pm=0 < %s | FileCheck %s
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; RUN: opt -passes='require<aa>,require<scalar-evolution>,require<aa>,loop(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(i16* noalias %a,
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i16* 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, i16* %a, i64 %iv.next
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%loadA_plus_2 = load i16, i16* %arrayidxA_plus_2, align 2
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%arrayidxB = getelementptr inbounds i16, i16* %b, i64 %iv
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%loadB = load i16, i16* %arrayidxB, align 2
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%mul = mul i16 %loadB, %loadA_plus_2
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%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %iv
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store i16 %mul, i16* %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(i16* noalias %a,
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i16* 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, i16* %a, i64 %idx
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%loadA_plus_2 = load i16, i16* %arrayidxA_plus_2, align 2
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%arrayidxB = getelementptr inbounds i16, i16* %b, i64 %iv
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%loadB = load i16, i16* %arrayidxB, align 2
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%mul = mul i16 %loadB, %loadA_plus_2
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%arrayidxA = getelementptr inbounds i16, i16* %a, i64 %iv
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store i16 %mul, i16* %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(i16* %a, i16* %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, i16* %a, i64 %iv
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%loadA = load i16, i16* %arrayidxA, align 2
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%arrayidxB = getelementptr inbounds i16, i16* %b, i64 %iv
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%loadB = load i16, i16* %arrayidxB, align 2
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%mul = mul i16 %loadB, %loadA
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store i16 %mul, i16* %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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