Skip to content

[LAA] Strip outdated comment in isDependent (NFC) #146367

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: main
Choose a base branch
from
+0 −16
Open

[LAA] Strip outdated comment in isDependent (NFC) #146367

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
16 changes: 0 additions & 16 deletions llvm/lib/Analysis/LoopAccessAnalysis.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2280,22 +2280,6 @@ MemoryDepChecker::isDependent(const MemAccessInfo &A, unsigned AIdx,
return Dependence::Backward;
}

// Positive distance bigger than max vectorization factor.
// FIXME: Should use max factor instead of max distance in bytes, which could
// not handle different types.
// E.g. Assume one char is 1 byte in memory and one int is 4 bytes.
// void foo (int *A, char *B) {
// for (unsigned i = 0; i < 1024; i++) {
// A[i+2] = A[i] + 1;
// B[i+2] = B[i] + 1;
// }
// }
//
// This case is currently unsafe according to the max safe distance. If we
// analyze the two accesses on array B, the max safe dependence distance
// is 2. Then we analyze the accesses on array A, the minimum distance needed
// is 8, which is less than 2 and forbidden vectorization, But actually
// both A and B could be vectorized by 2 iterations.
MinDepDistBytes =
std::min(static_cast<uint64_t>(MinDistance), MinDepDistBytes);

Expand Down
Loading