https://llvm.org/bugs/show_bug.cgi?id=26106
Bug ID: 26106
Summary: Loop Vectorizer on ARM - why is the relative speedup
so much worse?
Product: libraries
Version: 3.6
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: unassignedb...@nondot.org
Reporter: tulip...@gmail.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 15600
--> https://llvm.org/bugs/attachment.cgi?id=15600&action=edit
armv7 LLVM-IR output
Hi,
It's my first issue here (I only use llvm via rust) so I might be mistaken in
my understanding but here's the problem. The code snippet from this rust issue:
https://github.com/rust-lang/rust/issues/30805
is being successfully optimized on x86_64 and posts a 20x speedup using SSE2
whereas on ARM it's a meagre 3x speedup using NEON.
The relative difference seems a little high - is there a problem somewhere on
ARM?
I'm attaching armv7 LLVM-IR in case there is.
Thanks.
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