https://bugs.llvm.org/show_bug.cgi?id=43161
Bug ID: 43161
Summary: [loop vectorizer] Single extra copy of for loop breaks
vectorization of the previous 4 copies.
Product: clang
Version: 9.0
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: manolis...@windowslive.com
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
Created attachment 22446
--> https://bugs.llvm.org/attachment.cgi?id=22446&action=edit
Code posted on godbolt
Hello, could you please have a look at this code posted on godbolt.org:
https://godbolt.org/z/O-O-Q7
(code also attached in case godbolt link breaks)
The problem is that inside the compute function, only the first loop vectorizes
while the rest copies of it don't. But if I remove any of the for loops, then
the rest vectorize successfully. The message "Cannot identify array bounds" is
not helpful.
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