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Author SHA1 Message Date
Evan Cheng 7f8e563a69 Add bundle aware API for querying instruction properties and switch the code 
generator to it. For non-bundle instructions, these behave exactly the same
as the MC layer API.

For properties like mayLoad / mayStore, look into the bundle and if any of the
bundled instructions has the property it would return true.
For properties like isPredicable, only return true if *all* of the bundled
instructions have the property.
For properties like canFoldAsLoad, isCompare, conservatively return false for
bundles.

llvm-svn: 146026
 2011-12-07 07:15:52 +00:00
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
Benjamin Kramer 7859d2e148 Use internal storage for command line option. 
llvm-svn: 139079
 2011-09-03 03:45:06 +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