integer-gmp division regression

With ghc 7.6.3:

ghci> quotRem 0x10000000000000001 (-0x100000)
(-17592186044416,1)
ghci> quotRem 0x10000001 (-0x100000)
(-256,1)

with ghc 7.7

ghci> quotRem 0x10000000000000001 (-0x100000)
(-17592186044416,-1)
ghci> quotRem 0x10000001 (-0x100000)
(-256,1)

Trac metadata

Trac field	Value
Version	7.7
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	libraries (other)
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture

changed milestone to %7.8.1

changed weight to 5

added Tbug Trac import labels

changed weight to 10

assigned to @hvr

Trac metadata

Trac field	Value
Version	7.7 → 7.8.1-rc1
Priority	normal → highest

Related problems with divMod. ghc-7.6.3:

Prelude> divMod 0x10000000000000001 (-0x100000)
(-17592186044417,-1048575)
Prelude> divMod 0x10000000001 (-0x100000)
(-1048577,-1048575)

With ghc-7.7:

Prelude> divMod 0x10000000000000001 (-0x100000)
(17592186044417,1048575)
Prelude> divMod 0x10000000001 (-0x100000)
(-1048577,-1048575)

mentioned in commit bcd38ea7

mentioned in commit 5f64b2c6

closed

Merged to HEAD/7.8 by Herbert.

Trac metadata

Trac field	Value
Resolution	Unresolved → ResolvedFixed

Trac metadata

Trac field	Value
Test case	→ numeric/should_run/T8726
Related	→ #8647 (closed)

added integer-gmp label

added incorrect runtime result label

added Phighest label