https://llvm.org/bugs/show_bug.cgi?id=30472
Bug ID: 30472
Summary: [LoopInterchange] Missed optimization with no
dependencies.
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: mcros...@codeaurora.org
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
If I'm not mistaken, we should be able to interchange the below loop, but we
currently don't.
unsigned no_deps_interchange(unsigned **Arr, unsigned k) {
unsigned sum = 0;
for (int i = 0; i < 1024; ++i)
for(int j = 0; j < 1024; ++j)
sum += Arr[j][i] + k;
return sum;
}
The first issue is that we bail from loop interchange if we don't find any
dependencies (i.e., DepMatrix.size() == 0).
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