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Author SHA1 Message Date
Manman Ren f87dd7c01b Revert r160920 and r160919 due to dragonegg and clang selfhost failure 
llvm-svn: 160927
 2012-07-29 02:44:09 +00:00
Manman Ren 0fa3ab88ba X86 Peephole: fold loads to the source register operand if possible. 
Machine CSE and other optimizations can remove instructions so folding
is possible at peephole while not possible at ISel.

rdar://10554090 and rdar://11873276

llvm-svn: 160919
 2012-07-28 16:48:01 +00:00
Dan Gohman 40503396da Eliminate more uses of llvm-as and llvm-dis. 
llvm-svn: 81290
 2009-09-08 23:54:48 +00:00
Dan Gohman cc78cdf275 Mark x86's V_SET0 and V_SETALLONES with isSimpleLoad, and teach X86's 
foldMemoryOperand how to "fold" them, by converting them into constant-pool
loads. When they aren't folded, they use xorps/cmpeqd, but for example when
register pressure is high, they may now be folded as memory operands, which
reduces register pressure.

Also, mark V_SET0 isAsCheapAsAMove so that two-address-elimination will
remat it instead of copying zeros around (V_SETALLONES was already marked).

llvm-svn: 60461
 2008-12-03 05:21:24 +00:00