555e09c2b0
This updates the naming for the LAA printing pass to be in line with most other analysis printing passes. The old name has come up as confusing multiple times already, e.g. in D131924.
65 lines
2.3 KiB
LLVM
65 lines
2.3 KiB
LLVM
; RUN: opt -passes='print<access-info>' -disable-output < %s 2>&1 | FileCheck %s
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; Check that loop-indepedent forward dependences are discovered properly.
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;
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; FIXME: This does not actually always work which is pretty confusing. Right
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; now there is hack in LAA that tries to figure out loop-indepedent forward
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; dependeces *outside* of the MemoryDepChecker logic (i.e. proper dependence
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; analysis).
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;
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; Therefore if there is only loop-independent dependences for an array
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; (i.e. the same index is used), we don't discover the forward dependence.
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; So, at ***, we add another non-I-based access of A to trigger
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; MemoryDepChecker analysis for accesses of A.
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;
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; for (unsigned i = 0; i < 100; i++) {
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; A[i + 1] = B[i] + 1; // ***
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; A[i] = B[i] + 2;
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; C[i] = A[i] * 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(i32* noalias %A, i32* noalias %B, i32* noalias %C, i64 %N) {
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; CHECK: Dependences:
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; CHECK-NEXT: Forward:
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; CHECK-NEXT: store i32 %b_p1, i32* %Aidx, align 4 ->
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; CHECK-NEXT: %a = load i32, i32* %Aidx, align 4
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; CHECK: ForwardButPreventsForwarding:
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; CHECK-NEXT: store i32 %b_p2, i32* %Aidx_next, align 4 ->
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; CHECK-NEXT: %a = load i32, i32* %Aidx, align 4
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; CHECK: Forward:
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; CHECK-NEXT: store i32 %b_p2, i32* %Aidx_next, align 4 ->
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; CHECK-NEXT: store i32 %b_p1, i32* %Aidx, align 4
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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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%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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%Aidx_next = getelementptr inbounds i32, i32* %A, i64 %indvars.iv.next
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%Aidx = getelementptr inbounds i32, i32* %A, i64 %indvars.iv
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%b = load i32, i32* %Bidx, align 4
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%b_p2 = add i32 %b, 1
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store i32 %b_p2, i32* %Aidx_next, align 4
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%b_p1 = add i32 %b, 2
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store i32 %b_p1, i32* %Aidx, align 4
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%a = load i32, i32* %Aidx, align 4
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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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