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From: | "Dave Korn" <dave DOT korn AT artimi DOT com> |
To: | <cygwin AT cygwin DOT com> |
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Subject: | RE: newlib?: pow function can produce incorrect results. |
Date: | Tue, 24 Apr 2007 03:23:43 +0100 |
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On 24 April 2007 03:14, Lev Bishop wrote: > On 4/23/07, Dave Korn wrote: >> On 24 April 2007 00:53, Cary R. wrote: >> >>> I had some more time to look into this and when the >>> simple C program I mentioned earlier uses variables >>> like the other program, incorrect results are >>> produced. I have attached this C/C++ program. I >>> certainly don't understand what is going on. I would >>> have expected pow to be pass-by value which should >>> make the two calls identical from a system standpoint, >>> but the results imply something different. Any >>> suggestions would be greatly appreciated. >> >> >> The notorious PR323. > > Nah, in this case it's just that gcc's __builtin_pow() is more > standards-compliant than newlib's pow(). Yeh, after a second reading through the assembly I figure you're right. Maybe I should sleep every now and againzzzzzzzzzzzzzzzz...... cheers, DaveK -- Can't think of a witty .sigline today.... -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/
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