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4 Commits

Author SHA1 Message Date
Craig Topper e57b49ee16 Add mcpu to tests to prevent them from using AVX instructions on Sandy Bridge after r155618. 
llvm-svn: 155696
 2012-04-27 07:11:58 +00:00
Jakob Stoklund Olesen bde32d36bb Make X86::FsFLD0SS / FsFLD0SD real pseudo-instructions. 
Like V_SET0, these instructions are expanded by ExpandPostRA to xorps /
vxorps so they can participate in execution domain swizzling.

This also makes the AVX variants redundant.

llvm-svn: 145440
 2011-11-29 22:27:25 +00:00
Jakob Stoklund Olesen f8ad336bc4 Break false dependencies before partial register updates. 
Two new TargetInstrInfo hooks lets the target tell ExecutionDepsFix
about instructions with partial register updates causing false unwanted
dependencies.

The ExecutionDepsFix pass will break the false dependencies if the
updated register was written in the previoius N instructions.

The small loop added to sse-domains.ll runs twice as fast with
dependency-breaking instructions inserted.

llvm-svn: 144602
 2011-11-15 01:15:30 +00:00
Jakob Stoklund Olesen 3dc89c9768 Collapse DomainValues across loop back-edges. 
During the initial RPO traversal of the basic blocks, remember the ones
that are incomplete because of back-edges from predecessors that haven't
been visited yet.

After the initial RPO, revisit all those loop headers so the incoming
DomainValues on the back-edges can be properly collapsed.

This will properly fix execution domains on software pipelined code,
like the included test case.

llvm-svn: 144151
 2011-11-09 01:06:56 +00:00