[ts-7000] Warning: Floating point format bug encountered using arm-linux-gcc-3.3.4

["arm.user" <>]

Hi All,

While porting an x86-based communications project to a TS-7250, I 
encountered an bug relating to how (8-byte) doubles are stored 
internally in applications compiled using arm-linux-gcc-3.3.4.

The bug manifests itself as a non-standard byte ordering in memory. 
Specifically, instead of the 8-bytes bytes associated with double 
precision float being ordered as:

   B0 B1 B2 B3 B4 B5 B6 B7

they are actually ordered as:

   B4 B5 B6 B7 B0 B1 B2 B3

which is neither LSB or MSB.  The bytes, when re-arranged, do 
correspond to the IEEE-754 format and yield correct floating point 
value.

A note about this bug appear this appears 
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18620, where the issue 
declared "WONTFIX".

Regards
Roy

PS: A great page for validating the IEEE-754 floating point format is:
http://babbage.cs.qc.edu/IEEE-754/Decimal.html







 
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