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Author SHA1 Message Date
Sanjay Patel 3e9664fd60 regenerate checks 
llvm-svn: 264677
 2016-03-28 22:12:21 +00:00
Rafael Espindola a5e536ab0e Second part of pr16069 
The problem this time seems to be a thinko. We were assuming that in the CFG

A
| \
|  B
| /
C

speculating the basic block B would cause only the phi value for the B->C edge
to be speculated. That is not true, the phi's are semantically in the edges, so
if the A->B->C path is taken, any code needed for A->C is not executed and we
have to consider it too when deciding to speculate B.

llvm-svn: 183226
 2013-06-04 14:11:59 +00:00
David Majnemer c82f27af2a SimplifyCFG: Do not transform PHI to select if doing so would be unsafe 
PR16069 is an interesting case where an incoming value to a PHI is a
trap value while also being a 'ConstantExpr'.

We do not consider this case when performing the 'HoistThenElseCodeToIf'
optimization.

Instead, make our modifications more conservative if we detect that we
cannot transform the PHI to a select.

llvm-svn: 183152
 2013-06-03 20:43:12 +00:00