llvm-project/llvm/test/Transforms/SLPVectorizer
Hal Finkel 3b7fc86677 [SLPVectorize] Basic ephemeral-value awareness
The SLP vectorizer should not vectorize ephemeral values. These are used to
express information to the optimizer, and vectorizing them does not lead to
faster code (because the ephemeral values are dropped prior to code generation,
vectorized or not), and obscures the information the instructions are
attempting to communicate (the logic that interprets the arguments to
@llvm.assume generically does not understand vectorized conditions).

Also, uses by ephemeral values are free (because they, and the necessary
extractelement instructions, will be dropped prior to code generation).

llvm-svn: 219816
2014-10-15 17:35:01 +00:00
..
AArch64 [AArch64] Improve cost model to handle sdiv by a pow-of-two. 2014-09-29 13:59:31 +00:00
ARM Preserve IR flags (nsw, nuw, exact, fast-math) in SLP vectorizer (PR20802). 2014-09-03 17:40:30 +00:00
R600 Reduce verbiage of lit.local.cfg files 2014-06-09 22:42:55 +00:00
X86 [SLPVectorize] Basic ephemeral-value awareness 2014-10-15 17:35:01 +00:00
XCore Reduce verbiage of lit.local.cfg files 2014-06-09 22:42:55 +00:00