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Re: Re: math broken on mips

To: Hartvig Ekner <>
Subject: Re: Re: math broken on mips
From: Zhang Fuxin <>
Date: Mon, 18 Feb 2002 17:2:22 +0800
Cc: "" <>

  Thank you very much.

  I will gather all the problems and examples to show them i know and post them
today. Please wait for some time.

在 2002-02-18 09:16:00 you wrote:
>Hi Zhang,
>we're talking to Algorithmics about the possibility of productizing their
>SDE compiler for Linux. If this materializes, we should be able to get the
>GCC issues you mention fixed.
>Could you therefore pls. send me examples showing all the GCC issues you
>1) SNan & QNan handling wrong
>2) Wrong code generated with -O2 (exception handling problem)
>3) Wrong code generated with -O2 (long long type problem)
>I would like (small!) examples suitable for inclusion directly in a work 
I like small one too:). 
>specification, so items like "Mozilla doesn't run" is not good enough :-)
>Finally, Kjeld E. at MIPS is spending some time on math-emu. So if you have
>specific issues, you can try to mail him as well (
>Problem #4 you report could be either in glibc or math-emu. If it's math-emu
>we'll fix it.
>Zhang Fuxin writes:
>> hi,
>>    There are so many problems on math handling for linux-mips,including:
>> 1. SNaN & QNan handling(both gcc & glibc)
>> 2. gcc2.96 generates wrong code with -O2,at least 
>>      one will lead to exception handling problem(reported by me)
>>      one will lead to some 'long long' type mishandling(reported by Atsushi 
>> Nemoto)
>>    (gcc3.1 seems a lot better,but it has problem to compile glibc.I can't 
>> even compile
>>  current glibc cvs code(with dl-conflict.c etc patched) with it. The best 
>> result is
>>  a segment fault when using
>>       ../elf/ --library-path 
>> ..:../math:../elf:../dlfcn:../nss:../nis:../rt:../resolv:
>>   ../crypt:../linuxthreads ./rpcgen -Y ../scripts -c rpcsvc/bootparam_prot.x 
>> -o 
>>   xbootparam_prot.T
>>   make[1]: *** [xbootparam_prot.stmp] Segmentation fault
>>   )     
>> 3. problems with math-emu
>> 4. other problems to be investigated for its cause,including this one,
>>        pow(2,7) = 128.0 when rounding = TONEAREST or UPWARD
>>                 = 64.1547.. when rounding = DOWNWARD or TOWARDZERO
>>  when today i find out the above problem I was feeling almost despaired:(
>>  I want to fix these problems,if i could.But it concerns so many things that 
>> i am not
>>  expert on and no time to dig:(. So any help will be highly appreciated.
>> Regards
>>             Zhang Fuxin

            Zhang Fuxin

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