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Re: Byteswapping floating point types
- From: Andrew Troschinetz <ast at arlut dot utexas dot edu>
- To: gcc-help at gcc dot gnu dot org
- Cc: Andrew Haley <aph at redhat dot com>
- Date: Thu, 16 Jul 2009 16:14:14 -0500
- Subject: Re: Byteswapping floating point types
On Jul 16, 2009, at 12:14 PM, Andrew Troschinetz wrote:
If I use GCC 2.95, or GCC 3.4.6 to compile the code and run it, the
problem presents itself. But if I use GCC 4.1.2 the code compiles
and runs just fine.
Scratch that. I'm an idiot for taking this guy's word. He was the one
that ran these tests and reported back to me that everything works
when the compiler is GCC 4.x. I just tried it myself and yup, the test
fails in exactly the way we expect it to fail.
Ugh, at this point I'm really just disgusted with this guy.
On Jul 16, 2009, at 12:53 PM, Andrew Haley wrote:
Can't he find a task more suited to his skills? Farming, perhaps.
Can you believe he's my boss?
No. An attempt to load a signaling NaN from memory into the FPU
generates
an invalid-operation exception. If that exception is masked, the FPU
returns a quiet NaN. [1]
Andrew.
[1] 8.5.1.2. INVALID ARITHMETIC OPERAND EXCEPTION (#IA), IA-32 Intel
Architecture
Software Developer’s Manual, Basic Architecture, Order Number
245470, 2001.
Awesome, I really appreciate it. However in the face of willful
ignorance I doubt it will do me much good. Sigh.
--
Andrew Troschinetz
(512) 835-3410
Applied Research Laboratories