Message 68955 - Python tracker

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In-reply-to
Author	MrJean1
Recipients	MrJean1, mark.dickinson, terry.reedy
Date	2008年06月29日.16:43:34
SpamBayes Score	0.044394568
Marked as misclassified	No
Message-id	<1214757815.56.0.0840247486621.issue3168@psf.upfronthosting.co.za>

Content
I have not yet been able to duplicate the problem in a smaller test case, but I did stumble into a fix. Changing the following statement in the cmath_log function from if (PyTuple_GET_SIZE(args) == 2) x = c_quot(x, c_log(y)); to if (PyTuple_GET_SIZE(args) == 2) { y = c_log(y); x = c_quot(x, y); } fixes the problem for the 64-bit -xO5 Python build. The result is no the same in all 32- and 64-bit builds with -xO0 and -xO5 on Solaris 10 (Opteron) with SUN C. >>> cmath.log(100, 2) (6.6438561897747253+0j) >>> cmath.log(0.01, 0.5) (6.6438561897747244-0j)

Content

I have not yet been able to duplicate the problem in a smaller test 
case, but I did stumble into a fix. Changing the following statement in 
the cmath_log function from
	if (PyTuple_GET_SIZE(args) == 2)
		x = c_quot(x, c_log(y));
to
	if (PyTuple_GET_SIZE(args) == 2) {
		y = c_log(y);
		x = c_quot(x, y);
	}
fixes the problem for the 64-bit -xO5 Python build. The result is no 
the same in all 32- and 64-bit builds with -xO0 and -xO5 on Solaris 10 
(Opteron) with SUN C.
>>> cmath.log(100, 2)
(6.6438561897747253+0j)
>>> cmath.log(0.01, 0.5)
(6.6438561897747244-0j)

History
Date	User	Action	Args
2008年06月29日 16:43:35	MrJean1	set	spambayes_score: 0.0443946 -> 0.044394568 recipients: + MrJean1, terry.reedy, mark.dickinson
2008年06月29日 16:43:35	MrJean1	set	spambayes_score: 0.0443946 -> 0.0443946 messageid: <1214757815.56.0.0840247486621.issue3168@psf.upfronthosting.co.za>
2008年06月29日 16:43:34	MrJean1	link	issue3168 messages
2008年06月29日 16:43:34	MrJean1	create

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