https://bugs.llvm.org/show_bug.cgi?id=34125
Bug ID: 34125
Summary: Clang punts on vectorization and issues incorrect
diagnostic
Product: clang
Version: 4.0
Hardware: Macintosh
OS: MacOS X
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: jeff.scie...@gmail.com
CC: llvm-bugs@lists.llvm.org
Created attachment 18948
--> https://bugs.llvm.org/attachment.cgi?id=18948&action=edit
make command output
Clang claims the reason it does not vectorize star[45] is because the trip
count cannot be determined, but the trip count determination is identical in
star[123], which are vectorized.
./stencil_tbb.hpp:63:7: remark: loop not vectorized: could not determine number
of loop iterations [-Rpass-analysis]
for (auto j=r.cols().begin(); j!=r.cols().end(); ++j ) {
^
As best I can tell, the issue is that the loop bodies for star[45] are too
large. Functions with 12 or fewer terms are vectorized whereas those with 16
or more are not.
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