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Author SHA1 Message Date
Richard Sandiford 73170f8488 [SystemZ] Optimize fcmp X, 0 in cases where X is also negated 
In such cases it's often better to test the result of the negation instead,
since the negation also sets CC.

llvm-svn: 197032
 2013-12-11 11:45:08 +00:00
Richard Sandiford 198ddf83c1 [SystemZ] Use LOAD AND TEST for comparisons with -0 
...since it os equivalent to comparison with +0.

llvm-svn: 196580
 2013-12-06 09:59:12 +00:00
Richard Sandiford 0897fce2f4 [SystemZ] Optimize floating-point comparisons with zero 
This follows the same lines as the integer code.  In the end it seemed
easier to have a second 4-bit mask in TSFlags to specify the compare-like
CC values.  That eats one more TSFlags bit than adding a CCHasUnordered
would have done, but it feels more concise.

llvm-svn: 187883
 2013-08-07 11:10:06 +00:00