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11 Commits

Author SHA1 Message Date
Chris Lattner 503a0ef6f4 reduce indentation, minor cleanups. 
llvm-svn: 100042
 2010-03-31 20:32:51 +00:00
Jakob Stoklund Olesen 58ca0a649c Use spaces, not tabs 
llvm-svn: 100037
 2010-03-31 20:05:12 +00:00
Jakob Stoklund Olesen 4cd5866f8e Fix PR6750. Don't try to merge a DomainValue with itself. 
llvm-svn: 100016
 2010-03-31 17:13:16 +00:00
Jakob Stoklund Olesen 710c6892be Fix typo. Thank you, valgrind. 
llvm-svn: 99974
 2010-03-31 00:40:08 +00:00
Jakob Stoklund Olesen 3b9af40938 Add cross-block inference to SSEDomainFix. 
llvm-svn: 99916
 2010-03-30 20:04:01 +00:00
Jakob Stoklund Olesen 486aa2eadc Be gentle to MSVC. C++ is hard, after all. 
llvm-svn: 99855
 2010-03-30 00:09:32 +00:00
Jakob Stoklund Olesen b551aa4da5 Basic implementation of SSEDomainFix pass. 
Cross-block inference is primitive and wrong, but the pass is working otherwise.

llvm-svn: 99848
 2010-03-29 23:24:21 +00:00
Daniel Dunbar d919276bc0 Fix -Asserts warning, again. 
llvm-svn: 99542
 2010-03-25 19:35:53 +00:00
Jakob Stoklund Olesen 49e121d5e4 Add a late SSEDomainFix pass that twiddles SSE instructions to avoid domain crossings. 
On Nehalem and newer CPUs there is a 2 cycle latency penalty on using a register
in a different domain than where it was defined. Some instructions have
equvivalents for different domains, like por/orps/orpd.

The SSEDomainFix pass tries to minimize the number of domain crossings by
changing between equvivalent opcodes where possible.

This is a work in progress, in particular the pass doesn't do anything yet. SSE
instructions are tagged with their execution domain in TableGen using the last
two bits of TSFlags. Note that not all instructions are tagged correctly. Life
just isn't that simple.

The SSE execution domain issue is very similar to the ARM NEON/VFP pipeline
issue handled by NEONMoveFixPass. This pass may become target independent to
handle both.

llvm-svn: 99524
 2010-03-25 17:25:00 +00:00
Jakob Stoklund Olesen a86ccbfe88 Revert "Add a late SSEDomainFix pass that twiddles SSE instructions to avoid domain crossings." 
This reverts commit 99345. It was breaking buildbots.

llvm-svn: 99352
 2010-03-23 23:48:51 +00:00
Jakob Stoklund Olesen 31da45b7af Add a late SSEDomainFix pass that twiddles SSE instructions to avoid domain crossings. 
This is work in progress. So far, SSE execution domain tables are added to
X86InstrInfo, and a skeleton pass is enabled with -sse-domain-fix.

llvm-svn: 99345
 2010-03-23 23:14:44 +00:00