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4 Commits

Author SHA1 Message Date
Dan Gohman 8a977e2edd -disable-output is no longer needed with -analyze. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94574 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-26 19:25:59 +00:00
Dan Gohman 52fddd3e36 Fix the the ceiling-division used in computing the MaxBECount so that it doesn't 
have trouble with an intermediate add overflowing. Also, be more conservative
about the case where the induction variable in an SLT loop exit can step past
the RHS of the SLT and overflow in a single step.

Make getSignedRange more aggressive, to recover for some common cases which
the above fixes pessimized.

This addresses rdar://7561161.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94512 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-26 04:40:18 +00:00
Dan Gohman 3073329c53 Use WriteAsOperand instead of getName() to print loop header names, 
so that unnamed blocks are handled.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@93059 91177308-0d34-0410-b5e6-96231b3b80d8
 2010-01-09 18:17:45 +00:00
Dan Gohman 1f96e67f78 Teach ScalarEvolution how to reason about no-wrap flags on loops 
where the induction variable has a non-unit stride, such as {0,+,2}, and
there are expressions such as {1,+,2} inside the loop formed with
or or add nsw operators.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82151 91177308-0d34-0410-b5e6-96231b3b80d8
 2009-09-17 18:05:20 +00:00