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* gdb.texinfo (C and C++): Add Decimal Floating Point format

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subsubsection.
	(Decimal Floating Point format): New subsubsection.
This commit is contained in:
Thiago Jung Bauermann
2008-01-07 22:35:36 +00:00
parent f6867ce08c
commit febe438365
2 changed files with 29 additions and 0 deletions
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gdb/doc/ChangeLog
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@ -1,3 +1,9 @@
2008-01-07 Thiago Jung Bauermann <bauerman@br.ibm.com>
* gdb.texinfo (C and C++): Add Decimal Floating Point format
subsubsection.
(Decimal Floating Point format): New subsubsection.
2008-01-05 Pedro Alves <pedro@codesourcery.com>
* gdb.texinfo (File Options): Remove mention of the attempt to

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gdb/doc/gdb.texinfo
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@ -9136,6 +9136,7 @@ gcc.info, Using the @sc{gnu} Compiler Collection (GCC)}.
* C Checks:: C and C@t{++} type and range checks
* Debugging C:: @value{GDBN} and C
* Debugging C Plus Plus:: @value{GDBN} features for C@t{++}
* Decimal Floating Point:: Numbers in Decimal Floating Point format
@end menu
@node C Operators
@ -9604,6 +9605,28 @@ available choices, or to finish the type list for you.
@xref{Completion,, Command Completion}, for details on how to do this.
@end table
@node Decimal Floating Point
@subsubsection Decimal Floating Point format
@cindex decimal floating point format
@value{GDBN} can examine, set and perform computations with numbers in
decimal floating point format, which in the C language correspond to the
@code{_Decimal32}, @code{_Decimal64} and @code{_Decimal128} types as
specified by the extension to support decimal floating-point arithmetic.
There are two encodings in use, depending on the architecture: BID (Binary
Integer Decimal) for x86 and x86-64, and DPD (Densely Packed Decimal) for
PowerPC. @value{GDBN} will use the appropriate encoding for the configured
target.
Because of a limitation in @file{libdecnumber}, the library used by @value{GDBN}
to manipulate decimal floating point numbers, it is not possible to convert
(using a cast, for example) integers wider than 32-bit to decimal float.
In addition, in order to imitate @value{GDBN}'s behaviour with binary floating
point computations, error checking in decimal float operations ignores
underflow, overflow and divide by zero exceptions.
@node Objective-C
@subsection Objective-C