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Implement a missing case in the definition of 'transpose'.

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Fixes issue #407
This commit is contained in:
Robert Dockins 2017-05-10 16:42:45 -07:00
parent f5aa763988
commit 7add78ec3c
3 changed files with 32 additions and 2 deletions
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13
src/Cryptol/Prims/Eval.hs
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@ -739,7 +739,7 @@ transposeV :: BitWord b w
-> GenValue b w
-> Eval (GenValue b w)
transposeV a b c xs
| isTBit c, Nat na <- a =
| isTBit c, Nat na <- a = -- Fin a => [a][b]Bit -> [b][a]Bit
return $ bseq $ IndexSeqMap $ \bi ->
return $ VWord na $ return $ BitsVal $
Seq.fromFunction (fromInteger na) $ \ai -> do
@ -749,7 +749,16 @@ transposeV a b c xs
VWord _ wv -> flip bitsSeq bi =<< wv
_ -> evalPanic "transpose" ["expected sequence of bits"]
| otherwise = do
| isTBit c, Inf <- a = -- [inf][b]Bit -> [b][inf]Bit
return $ bseq $ IndexSeqMap $ \bi ->
return $ VStream $ IndexSeqMap $ \ai ->
do ys <- flip lookupSeqMap ai =<< fromSeq "transposeV" xs
case ys of
VStream ys' -> VBit . fromVBit <$> lookupSeqMap ys' bi
VWord _ wv -> VBit <$> (flip bitsSeq bi =<< wv)
_ -> evalPanic "transpose" ["expected sequence of bits"]
| otherwise = -- [a][b]c -> [b][a]c
return $ bseq $ IndexSeqMap $ \bi ->
return $ aseq $ IndexSeqMap $ \ai -> do
ys <- flip lookupSeqMap ai =<< fromSeq "transposeV 1" xs

10
tests/issues/issue407.icry Normal file
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@ -0,0 +1,10 @@
:set prover-stats = off
transpose [0x0, 1 ...]
:pro (\(x:[4]) -> (transpose [x ...])@0@0 == False)
:pro (\(x:[4]) -> (transpose [x ...])@0@0 == x@0)
:pro (\(x:[4]) -> (transpose [x ...])@1@0 == x@1)
:pro (\(x:[4]) -> (transpose [x ...])@2@0 == x@2)
:pro (\(x:[4]) -> (transpose [x ...])@3@0 == x@3)
:pro (\(x:[4]) -> (transpose [x ...])@3@1 == ~(x@3))

11
tests/issues/issue407.icry.stdout Normal file
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@ -0,0 +1,11 @@
Loading module Cryptol
[[False, False, False, False, False, ...],
[False, False, False, False, True, ...],
[False, False, True, True, False, ...],
[False, True, False, True, False, ...]]
(\(x : [4]) -> (transpose [x ...]) @ 0 @ 0 == False) 0x8 = False
Q.E.D.
Q.E.D.
Q.E.D.
Q.E.D.
Q.E.D.