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from 1595a1cb7bf match.pd: A ^ ((A ^ B) & -(C cmp D)) -> (C cmp D) ? B : A s [...] new 2b42509f8b7 Fix availability compute during VN DOM elimination

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Summary of changes: gcc/ChangeLog | 12 ++++++++++++ gcc/testsuite/ChangeLog | 4 ++++ gcc/testsuite/gnat.dg/opt83.adb | 33 +++++++++++++++++++++++++++++++++ gcc/tree-dfa.c | 32 +++++++++++++++++--------------- gcc/tree-ssa-sccvn.c | 15 ++++++++++----- 5 files changed, 76 insertions(+), 20 deletions(-) create mode 100644 gcc/testsuite/gnat.dg/opt83.adb