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authorStavros Aronis <[email protected]>2015-04-23 11:15:47 +0200
committerZandra Hird <[email protected]>2015-05-05 15:27:49 +0200
commit00ff3b3776a62402e7977fd9172a926ad62ea449 (patch)
tree2ae704d67146a9aaab7b5702dd083d0762ce804d /configure.in
parent66260d0606fcbaad3d5179288fea90cfe546cbbe (diff)
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Fix a bug related to constraints generated for erlang:'*'/2
For Rst = A1 * A2, typesig for erlang:'*'/2 was constraining the arguments A1 and A2 in the 'reverse' direction by requiring that A2 is a subtype of Rst div A1, unless A1 is a hard zero. This is not correct: if for example both Rst and A1 are non_negative, such a constraint will first force A1 to be non-zero for the division to go through and then require A2 to be non_negative as non_negative div positive = non_negative, always (see commited test). In the fixed version, we are not constraining an argument if the other operand *may* be zero.
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