llvm-project

Author	SHA1	Message	Date
Eli Friedman	8f249600e7	Enhanced vzeroupper insertion pass that avoids inserting vzeroupper where it is unnecessary through local analysis. Patch from Bruno Cardoso Lopes, with some additional changes. I'm going to wait for any review comments and perform some additional testing before turning this on by default. llvm-svn: 143750	2011-11-04 23:46:11 +00:00
Bruno Cardoso Lopes	2a3ffb5d97	Introduce a pass to insert vzeroupper instructions to avoid AVX to SSE transition penalty. The pass is enabled through the "x86-use-vzeroupper" llc command line option. This is only the first step (very naive and conservative one) to sketch out the idea, but proper DFA is coming next to allow smarter decisions. Comments and ideas now and in further commits will be very appreciated. llvm-svn: 138317	2011-08-23 01:14:17 +00:00

Author

SHA1

Message

Date

Eli Friedman

8f249600e7

Enhanced vzeroupper insertion pass that avoids inserting vzeroupper where it is unnecessary through local analysis. Patch from Bruno Cardoso Lopes, with some additional changes.

I'm going to wait for any review comments and perform some additional testing before turning this on by default.

llvm-svn: 143750

2011-11-04 23:46:11 +00:00

Bruno Cardoso Lopes

2a3ffb5d97

Introduce a pass to insert vzeroupper instructions to avoid AVX to

SSE transition penalty. The pass is enabled through the "x86-use-vzeroupper"
llc command line option. This is only the first step (very naive and
conservative one) to sketch out the idea, but proper DFA is coming next
to allow smarter decisions. Comments and ideas now and in further commits
will be very appreciated.

llvm-svn: 138317

2011-08-23 01:14:17 +00:00

2 Commits