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Author SHA1 Message Date
Richard Trieu e9fa266cba Fix a bad interaction between -Wtautological-overlap-compare and delayed 
diagnostics which caused delayed diagnostics on dead paths to be emitted.

llvm-svn: 206232
 2014-04-15 00:57:50 +00:00
Richard Trieu f935b562b9 Add a new subgroup to -Wtautological-compare, -Wtautological-overlap-compare, 
which warns on compound conditionals that always evaluate to the same value.
For instance, (x > 5 && x < 3) will always be false since no value for x can
satisfy both conditions.

This patch also changes the CFG to use these tautological values for better
branch analysis.  The test for -Wunreachable-code shows how this change catches
additional dead code.

Patch by Anders Rönnholm.

llvm-svn: 205665
 2014-04-05 05:17:01 +00:00