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From: "Soegtrop, Michael" <michael DOT soegtrop AT intel DOT com>
To: "cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
Subject: RE: Floating point exception in strtod()
Date: Mon, 9 Apr 2018 14:45:56 +0000
Message-ID: <0F7D3B1B3C4B894D824F5B822E3E5A177861A71E@IRSMSX102.ger.corp.intel.com>
References: <dd5e98ea-8f39-1c4b-116c-37968cb3a52d AT cornell DOT edu> <20180409094706 DOT GO18998 AT calimero DOT vinschen DOT de>
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Dear Corinna,

> L is of type Long == int32_t, aadj is of type double.  The value of aadj at this time is 2529648000.0 == 0x96c75d80 which appears to be perfectly valid for a 32 bit int.

2529648000 is a valid unsigned long, but not a valid signed long. The largest 32 bit long is 2^31-1 = 2147483647. 0x96c75d80 interpreted as a signed long is a negative number.

I would say if floating point instructions are used to convert 2529648000 to a signed 32 bit integer, they should produce an FE_INVALID exception.
 
Best regards,

Michael
Intel Deutschland GmbH
Registered Address: Am Campeon 10-12, 85579 Neubiberg, Germany
Tel: +49 89 99 8853-0, www.intel.de
Managing Directors: Christin Eisenschmid, Christian Lamprechter
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Commercial Register: Amtsgericht Muenchen HRB 186928

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