floor (0/0) :: Int is different with -O0 and -O1

This program:

main = print (floor (0/0) :: Int)

prints a different result with -O0:

0

and -O1:

-9223372036854775808

Trac metadata

Trac field	Value
Version	7.6.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case
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Architecture