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Full Discussion: Strange value of the double type variable: -nan(0x8000000000000)
Top Forums Programming Strange value of the double type variable: -nan(0x8000000000000) Post 302903932 by 915086731 on Saturday 31st of May 2014 12:32:18 AM
Old 05-31-2014
Code:
tmp1 = (simtime - seg->time) / currdisk->rotatetime;
currdisk->currangle += tmp1;

The above code can also cause NaN in the later calling.
So I step into to the assembly.
tmp1 = (simtime - seg->time) / currdisk->rotatetime;
Code:
0x0808fdf4  <disk_buffer_sector_done+559>:  fldl   0x80b2208
0x0808fdfa  <disk_buffer_sector_done+565>:  mov    -0x38(%ebp),%eax
0x0808fdfd  <disk_buffer_sector_done+568>:  fldl   (%eax)

...Here, the content of %eax is 0x80bdfeb, which is the address of seg->time.
After the above "fldl (%eax) " executed, the content of register st0 is 0x8000000000000000, which represents NaN.
So the NaN is propagated to the following instructions. This is the key issue.
Code:
0x0808fdff  <disk_buffer_sector_done+570>:  fsubrp %st,%st(1)
0x0808fe01  <disk_buffer_sector_done+572>:  mov    0x8(%ebp),%eax
0x0808fe04  <disk_buffer_sector_done+575>:  fldl   0xc4(%eax)
0x0808fe0a  <disk_buffer_sector_done+581>:  fdivrp %st,%st(1)
0x0808fe0c  <disk_buffer_sector_done+583>:  fstpl  -0x28(%ebp)

 

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LEARN ABOUT MOJAVE

locale::codes::langfam5.18

Locale::Codes::LangFam(3pm)				 Perl Programmers Reference Guide			       Locale::Codes::LangFam(3pm)

NAME

       Locale::Codes::LangFam - standard codes for language extension identification

SYNOPSIS

	  use Locale::Codes::LangFam;

	  $lext = code2langfam('apa');		       # $lext gets 'Apache languages'
	  $code = langfam2code('Apache languages');    # $code gets 'apa'

	  @codes   = all_langfam_codes();
	  @names   = all_langfam_names();

DESCRIPTION

       The "Locale::Codes::LangFam" module provides access to standard codes used for identifying language families, such as those as defined in
       ISO 639-5.

       Most of the routines take an optional additional argument which specifies the code set to use. If not specified, the default ISO 639-5
       language family codes will be used.

SUPPORTED CODE SETS

       There are several different code sets you can use for identifying language families. A code set may be specified using either a name, or a
       constant that is automatically exported by this module.

       For example, the two are equivalent:

	  $lext = code2langfam('apa','alpha');
	  $lext = code2langfam('apa',LOCALE_LANGFAM_ALPHA);

       The codesets currently supported are:

       alpha
	   This is the set of three-letter (lowercase) codes from ISO 639-5 such as 'apa' for Apache languages.

	   This is the default code set.

ROUTINES

       code2langfam ( CODE [,CODESET] )
       langfam2code ( NAME [,CODESET] )
       langfam_code2code ( CODE ,CODESET ,CODESET2 )
       all_langfam_codes ( [CODESET] )
       all_langfam_names ( [CODESET] )
       Locale::Codes::LangFam::rename_langfam  ( CODE ,NEW_NAME [,CODESET] )
       Locale::Codes::LangFam::add_langfam  ( CODE ,NAME [,CODESET] )
       Locale::Codes::LangFam::delete_langfam  ( CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_alias  ( NAME ,NEW_NAME )
       Locale::Codes::LangFam::delete_langfam_alias  ( NAME )
       Locale::Codes::LangFam::rename_langfam_code  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::add_langfam_code_alias  ( CODE ,NEW_CODE [,CODESET] )
       Locale::Codes::LangFam::delete_langfam_code_alias  ( CODE [,CODESET] )
	   These routines are all documented in the Locale::Codes::API man page.

SEE ALSO

       Locale::Codes
	   The Locale-Codes distribution.

       Locale::Codes::API
	   The list of functions supported by this module.

       http://www.loc.gov/standards/iso639-5/id.php
	   ISO 639-5 .

AUTHOR

       See Locale::Codes for full author history.

       Currently maintained by Sullivan Beck (sbeck@cpan.org).

COPYRIGHT

	  Copyright (c) 2011-2013 Sullivan Beck

       This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

perl v5.18.2							    2013-11-04					       Locale::Codes::LangFam(3pm)
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