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author	Szabolcs Nagy <nsz@port70.net>
	Mon, 2 Sep 2013 23:35:46 +0000 (23:35 +0000)
committer	Szabolcs Nagy <nsz@port70.net>
	Thu, 5 Sep 2013 11:30:07 +0000 (11:30 +0000)
commit	98be442ee8a2b8b7e0802b604e384d5a2c43282e
tree	fe20ecbce7be9e457fd678a4e4cea6b0fe32e692	tree \| snapshot
parent	4cec31fc23b28271a2ed0b290e65699dffac3fee	commit \| diff

math: fix logb(-0.0) in downward rounding mode

use -1/(x*x) instead of -1/(x+0) to return -inf, -0+0 is -0 in
downward rounding mode

src/math/logb.c		diff \| blob \| history
src/math/logbf.c		diff \| blob \| history
src/math/logbl.c		diff \| blob \| history

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