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3 Commits

Author SHA1 Message Date
Preston Gurd
d1ae391210 This patch adds X86 instruction itineraries for non-pseudo opcodes in 
X86InstrCompiler.td.
 
It also adds –mcpu-generic to the legalize-shift-64.ll test so the test
will pass if run on an Intel Atom CPU, which would otherwise
produce an instruction schedule which differs from that which the test expects.

llvm-svn: 153033
 2012-03-19 14:10:12 +00:00
Benjamin Kramer
1b5aa9f5cd LegalizeIntegerTypes: Reorder operations in the "big shift by small amount" optimization, making the lives of later passes easier. 
llvm-svn: 151722
 2012-02-29 13:27:00 +00:00
Benjamin Kramer
daa291f4fd LegalizeIntegerTypes: Reenable the large shift with small amount optimization. 
To avoid problems with zero shifts when getting the bits that move between words
we use a trick: first shift the by amount-1, then do another shift by one. When
amount is 0 (and size 32) we first shift by 31, then by one, instead of by 32.

Also fix a latent bug that emitted the low and high words in the wrong order
when shifting right.

Fixes PR12113.

llvm-svn: 151637
 2012-02-28 17:58:00 +00:00