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Author SHA1 Message Date
Manman Ren adf4cc171e TBAA: update tbaa format from scalar format to struct-path aware format. 
llvm-svn: 191690
 2013-09-30 18:17:55 +00:00
Richard Sandiford 067817ee05 [SystemZ] Rein back the use of block operations 
The backend tries to use block operations like MVC, NC, OC and XC for
simple scalar operations.  For correctness reasons, it rejects any case
in which the regions might partially overlap.  However, for performance
reasons, it should also reject cases where the regions might be equal,
since the instruction might then not use the fast path.

This fixes a performance regression seen in bzip2.  We may want to limit
the optimisation even more in future, or even remove it entirely, but I'll
try with this for now.

llvm-svn: 191525
 2013-09-27 15:29:20 +00:00
Richard Sandiford 178273a174 [SystemZ] Add NC, OC and XC 
For now these are just used to handle scalar ANDs, ORs and XORs in which
all operands are memory.

llvm-svn: 190041
 2013-09-05 10:36:45 +00:00