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Fix overflow on win32

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Mamy André-Ratsimbazafy 2020-03-01 17:05:14 +01:00
parent 4b7c6b552e
commit adc630f3af
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1 changed files with 2 additions and 2 deletions
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constantine/primitives/extended_precision.nim
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@ -46,7 +46,7 @@ func unsafeFMA*(hi, lo: var Ct[uint32], a, b, c: Ct[uint32]) {.inline.} =
# the result is 62-bit and carrying cannot overflow # the result is 62-bit and carrying cannot overflow
let dblPrec = uint64(a) * uint64(b) + uint64(c) let dblPrec = uint64(a) * uint64(b) + uint64(c)
hi = Ct[uint32](dblPrec shr 31) hi = Ct[uint32](dblPrec shr 31)
lo = Ct[uint32](dblPrec) and Ct[uint32](1 shl 31 - 1) lo = Ct[uint32](dblPrec) and Ct[uint32](1'u32 shl 31 - 1)
func unsafeFMA2*(hi, lo: var Ct[uint32], a1, b1, a2, b2, c1, c2: Ct[uint32]) {.inline.}= func unsafeFMA2*(hi, lo: var Ct[uint32], a1, b1, a2, b2, c1, c2: Ct[uint32]) {.inline.}=
## (hi, lo) <- a1 * b1 + a2 * b2 + c1 + c2 ## (hi, lo) <- a1 * b1 + a2 * b2 + c1 + c2
@ -57,7 +57,7 @@ func unsafeFMA2*(hi, lo: var Ct[uint32], a1, b1, a2, b2, c1, c2: Ct[uint32]) {.i
uint64(c1) + uint64(c1) +
uint64(c2) uint64(c2)
hi = Ct[uint32](dblPrec shr 31) hi = Ct[uint32](dblPrec shr 31)
lo = Ct[uint32](dblPrec) and Ct[uint32](1 shl 31 - 1) lo = Ct[uint32](dblPrec) and Ct[uint32](1'u32 shl 31 - 1)
func unsafeFMA2_hi*(hi: var Ct[uint32], a1, b1, a2, b2, c1: Ct[uint32]) {.inline.}= func unsafeFMA2_hi*(hi: var Ct[uint32], a1, b1, a2, b2, c1: Ct[uint32]) {.inline.}=
## Returns the high word of the sum of extended precision multiply-adds ## Returns the high word of the sum of extended precision multiply-adds