[Bug tree-optimization/52267] a&~N where N has all the bits set up till a specific point can be folded to ((unsigned)a) < N
jakub at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Mar 15 10:43:00 GMT 2012
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52267
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-15 10:37:31 UTC ---
Author: jakub
Date: Thu Mar 15 10:37:27 2012
New Revision: 185427
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=185427
Log:
PR tree-optimization/52267
* tree-vrp.c (masked_increment): New function.
(register_edge_assert_for_2): Derive ASSERT_EXPRs
from (X & CST1) cmp CST2 tests.
* gcc.dg/pr52267.c: New test.
* gcc.dg/tree-ssa/vrp65.c: New test.
* gcc.dg/tree-ssa/vrp66.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr52267.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp65.c
trunk/gcc/testsuite/gcc.dg/tree-ssa/vrp66.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-vrp.c
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