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| author | Jean-Luc Duprat <jduprat@apple.com> | 2013-05-22 18:29:31 +0000 |
|---|---|---|
| committer | Jean-Luc Duprat <jduprat@apple.com> | 2013-05-22 18:29:31 +0000 |
| commit | 5e6cabd163c9c207df3778f3508b0de445578057 (patch) | |
| tree | 1c7d2157422f09ffd9ad2df66a07ec67f2162597 /lib/Transforms/Vectorize/SLPVectorizer.cpp | |
| parent | e0f26bc008bf7eb176595ab170cca86e21a6eae8 (diff) | |
| download | external_llvm-5e6cabd163c9c207df3778f3508b0de445578057.zip external_llvm-5e6cabd163c9c207df3778f3508b0de445578057.tar.gz external_llvm-5e6cabd163c9c207df3778f3508b0de445578057.tar.bz2 | |
This is an update to a previous commit (r181216).
The earlier change list introduced the following inst combines:
B * (uitofp i1 C) —> select C, B, 0
A * (1 - uitofp i1 C) —> select C, 0, A
select C, 0, B + select C, A, 0 —> select C, A, B
Together these 3 changes would simplify :
A * (1 - uitofp i1 C) + B * uitofp i1 C
down to :
select C, B, A
In practice we found that the first two substitutions can have a
negative effect on performance, because they reduce opportunities to
use FMA contractions; between the two options FMAs are often the
better choice. This change list amends the previous one to enable
just these inst combines:
select C, B, 0 + select C, 0, A —> select C, B, A
A * (1 - uitofp i1 C) + B * uitofp i1 C —> select C, B, A
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182499 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Vectorize/SLPVectorizer.cpp')
0 files changed, 0 insertions, 0 deletions