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3 Commits

Author SHA1 Message Date
Dan Gohman bcde172222 Add AsmPrinter support for emitting a directive to declare that 
the code being generated does not require an executable stack.

Also, add target-specific code to make use of this on Linux
on x86. 

llvm-svn: 50634
 2008-05-05 00:28:39 +00:00
Chris Lattner 5bd2f736e6 fix this testcase to pass and remove a duplicate instance of itself. 
llvm-svn: 49281
 2008-04-06 21:39:17 +00:00
Torok Edwin 613d7afe64 Prefer to expand mask for xor to -1, so we have a chance to turn it into a not. 
If it cannot be expanded, it will keep the old behaviour and try to shrink the constant.
Part of enhancement for PR2191.

llvm-svn: 49280
 2008-04-06 21:23:02 +00:00