diff options
Diffstat (limited to 'libraries/ghc-bignum/src/GHC/Num/BigNat.hs')
| -rw-r--r-- | libraries/ghc-bignum/src/GHC/Num/BigNat.hs | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/libraries/ghc-bignum/src/GHC/Num/BigNat.hs b/libraries/ghc-bignum/src/GHC/Num/BigNat.hs index 156a76d9ed..cf08320a11 100644 --- a/libraries/ghc-bignum/src/GHC/Num/BigNat.hs +++ b/libraries/ghc-bignum/src/GHC/Num/BigNat.hs @@ -101,6 +101,11 @@ bigNatOne :: Void# -> BigNat -- cf Note [Why Void#?] bigNatOne _ = case bigNatOneW of BigNatW w -> w +raiseDivZero_BigNat :: Void# -> BigNat +raiseDivZero_BigNat _ = case raiseDivZero of + !_ -> bigNatZero void# + -- see Note [ghc-bignum exceptions] in GHC.Num.Primitives + -- | Indicate if a bigNat is zero bigNatIsZero :: BigNat -> Bool bigNatIsZero bn = isTrue# (bigNatIsZero# bn) @@ -486,7 +491,10 @@ bigNatSubUnsafe a b in withNewWordArrayTrimed# szA \mwa s-> case inline bignat_sub mwa a b s of (# s', 0# #) -> s' - (# s', _ #) -> case underflow of _ -> s' + (# s', _ #) -> case raiseUnderflow of + !_ -> s' + -- see Note [ghc-bignum exceptions] in + -- GHC.Num.Primitives -- | Subtract two BigNat bigNatSub :: BigNat -> BigNat -> (# () | BigNat #) @@ -511,7 +519,7 @@ bigNatSub a b bigNatQuotWord# :: BigNat -> Word# -> BigNat bigNatQuotWord# a b | 1## <- b = a - | 0## <- b = case divByZero of _ -> bigNatZero void# + | 0## <- b = raiseDivZero_BigNat void# | True = let sz = wordArraySize# a @@ -531,7 +539,7 @@ bigNatQuotWord a (W# b) = bigNatQuotWord# a b -- b /= 0 bigNatRemWord# :: BigNat -> Word# -> Word# bigNatRemWord# a b - | 0## <- b = case divByZero of _ -> 0## + | 0## <- b = raiseDivZero_Word# void# | 1## <- b = 0## | bigNatIsZero a = 0## | True = inline bignat_rem_word a b @@ -549,7 +557,9 @@ bigNatRemWord a (W# b) = W# (bigNatRemWord# a b) -- b /= 0 bigNatQuotRemWord# :: BigNat -> Word# -> (# BigNat, Word# #) bigNatQuotRemWord# a b - | 0## <- b = case divByZero of _ -> (# bigNatZero void#, 0## #) + | 0## <- b = case raiseDivZero of + !_ -> (# bigNatZero void#, 0## #) + -- see Note [ghc-bignum exceptions] in GHC.Num.Primitives | 1## <- b = (# a, 0## #) | isTrue# (bigNatSize# a ==# 1#) , a0 <- indexWordArray# a 0# @@ -575,7 +585,9 @@ bigNatQuotRemWord# a b -- | BigNat division returning (quotient,remainder) bigNatQuotRem# :: BigNat -> BigNat -> (# BigNat,BigNat #) bigNatQuotRem# a b - | bigNatIsZero b = case divByZero of _ -> (# bigNatZero void#, bigNatZero void# #) + | bigNatIsZero b = case raiseDivZero of + !_ -> (# bigNatZero void#, bigNatZero void# #) + -- see Note [ghc-bignum exceptions] in GHC.Num.Primitives | bigNatIsZero a = (# bigNatZero void#, bigNatZero void# #) | bigNatIsOne b = (# a , bigNatZero void# #) | LT <- cmp = (# bigNatZero void#, a #) @@ -596,7 +608,7 @@ bigNatQuotRem# a b -- | BigNat division returning quotient bigNatQuot :: BigNat -> BigNat -> BigNat bigNatQuot a b - | bigNatIsZero b = case divByZero of _ -> bigNatZero void# + | bigNatIsZero b = raiseDivZero_BigNat void# | bigNatIsZero a = bigNatZero void# | bigNatIsOne b = a | LT <- cmp = bigNatZero void# @@ -613,7 +625,7 @@ bigNatQuot a b -- | BigNat division returning remainder bigNatRem :: BigNat -> BigNat -> BigNat bigNatRem a b - | bigNatIsZero b = case divByZero of _ -> bigNatZero void# + | bigNatIsZero b = raiseDivZero_BigNat void# | bigNatIsZero a = bigNatZero void# | bigNatIsOne b = bigNatZero void# | LT <- cmp = a @@ -1036,7 +1048,7 @@ bigNatLog2 a = W# (bigNatLog2# a) bigNatLogBase# :: BigNat -> BigNat -> Word# bigNatLogBase# base a | bigNatIsZero base || bigNatIsOne base - = case unexpectedValue of _ -> 0## + = unexpectedValue_Word# void# | 1# <- bigNatSize# base , 2## <- bigNatIndex# base 0# @@ -1062,8 +1074,8 @@ bigNatLogBase base a = W# (bigNatLogBase# base a) -- | Logarithm for an arbitrary base bigNatLogBaseWord# :: Word# -> BigNat -> Word# bigNatLogBaseWord# base a - | 0## <- base = case unexpectedValue of _ -> 0## - | 1## <- base = case unexpectedValue of _ -> 0## + | 0## <- base = unexpectedValue_Word# void# + | 1## <- base = unexpectedValue_Word# void# | 2## <- base = bigNatLog2# a -- TODO: optimize log base power of 2 (256, etc.) | True = bigNatLogBase# (bigNatFromWord# base) a @@ -1082,7 +1094,7 @@ bigNatLogBaseWord (W# base) a = W# (bigNatLogBaseWord# base a) bigNatSizeInBase# :: Word# -> BigNat -> Word# bigNatSizeInBase# base a | isTrue# (base `leWord#` 1##) - = case unexpectedValue of _ -> 0## + = unexpectedValue_Word# void# | bigNatIsZero a = 0## @@ -1111,7 +1123,7 @@ powModWord# = bignat_powmod_words -- | \"@'bigNatPowModWord#' /b/ /e/ /m/@\" computes base @/b/@ raised to -- exponent @/e/@ modulo @/m/@. bigNatPowModWord# :: BigNat -> BigNat -> Word# -> Word# -bigNatPowModWord# !_ !_ 0## = case divByZero of _ -> 0## +bigNatPowModWord# !_ !_ 0## = raiseDivZero_Word# void# bigNatPowModWord# _ _ 1## = 0## bigNatPowModWord# b e m | bigNatIsZero e = 1## @@ -1125,7 +1137,7 @@ bigNatPowMod :: BigNat -> BigNat -> BigNat -> BigNat bigNatPowMod !b !e !m | (# m' | #) <- bigNatToWordMaybe# m = bigNatFromWord# (bigNatPowModWord# b e m') - | bigNatIsZero m = case divByZero of _ -> bigNatZero void# + | bigNatIsZero m = raiseDivZero_BigNat void# | bigNatIsOne m = bigNatFromWord# 0## | bigNatIsZero e = bigNatFromWord# 1## | bigNatIsZero b = bigNatFromWord# 0## |