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from 84db5e00282 [InstCombine] Handle saddo always overflow new d4d582af7ca [X86][AVX] getTargetConstantBitsFromNode - extract bits fro [...] new 1fdc6783d8d Improve compile-time performance in computeKnownBitsFromAssume. new 7604f64a6f0 [InstCombine] ssubo X, C -> saddo X, -C

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Summary of changes: lib/Analysis/ValueTracking.cpp | 431 +++++++++++----------- lib/Target/X86/X86ISelLowering.cpp | 13 + lib/Transforms/InstCombine/InstCombineCalls.cpp | 21 ++ test/CodeGen/X86/combine-bitselect.ll | 118 +++--- test/Transforms/InstCombine/ssub-with-overflow.ll | 45 +-- 5 files changed, 315 insertions(+), 313 deletions(-)