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Optimize symbolic "extract" to produce literal value if result has width 0

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This commit is contained in:
Brian Huffman 2014-07-21 11:28:40 -07:00
parent 733c7932c5
commit 010d930638
1 changed files with 1 additions and 0 deletions
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src/Cryptol/Symbolic/BitVector.hs
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@ -106,6 +106,7 @@ instance SDivisible (SBV BitVector) where
extract :: Int -> Int -> SWord -> SWord
extract i j x =
case x of
_ | i < j -> SBV k (Left (CW k (CWInteger 0)))
SBV _ (Left cw) ->
case cw of
CW _ (CWInteger v) -> SBV k (Left (normCW (CW k (CWInteger (v `shiftR` j)))))