Re: optimization/10772: Result differences between debug and optmize libs on linux; and with sol/nt on optimize mode

["omar beo" <omarbeo@hotmail.com>]

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The following reply was made to PR optimization/10772; it has been noted by GNATS.

From: "omar beo" <omarbeo@hotmail.com>
To: bangerth@dealii.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, omarbeo@hotmail.com, gcc-gnats@gcc.gnu.org
Cc:  
Subject: Re: optimization/10772: Result differences between debug and optmize libs on
 linux; and with sol/nt on optimize mode
Date: Wed, 14 May 2003 13:20:26 -0600

 Hi,
 I tried your suggestion, and build the libs using " -ffloat-store " flag.
 It is true that now "Optimized and debug compilations give the same result 
 on Linux".
 But this did not answer the original question, why I’m not getting the same 
 results in the other platforms?
 
 If you run the test I provided, you will see that the result should be 
 00005975 in every case, but it is not when i run on linux. Why?
 
 If you are getting the same number in every case, could you please send me 
 the compilation arguments you used?
 
 The results of the test:
 Linux: debug or optimize libs
 var_1: 00005975
 var_2: 00005974  ...... * should be 00005974
 var_3: 00005975
 var_4: 00005974  .........* should be 00005974
 var_5: 00005975
 
 While sol debug or optimize give:
 var_1: 00005975
 var_2: 00005975
 var_3: 00005975
 var_4: 00005975
 var_5: 00005975
 
 
 >From: bangerth@dealii.org
 >Reply-To: bangerth@dealii.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org,  
 >nobody@gcc.gnu.org, omarbeo@hotmail.com, gcc-gnats@gcc.gnu.org
 >To: gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org,  
 >omarbeo@hotmail.com
 >Subject: Re: optimization/10772: Result differences between debug and 
 >optmize libs on linux; and with sol/nt on optimize mode
 >Date: 14 May 2003 15:14:49 -0000
 >
 >Synopsis: Result differences between debug and optmize libs on linux; and 
 >with sol/nt on optimize mode
 >
 >State-Changed-From-To: feedback->closed
 >State-Changed-By: bangerth
 >State-Changed-When: Wed May 14 15:14:48 2003
 >State-Changed-Why:
 >     Not a bug. Optimized and debug compilations give the same
 >     result is -ffloat-store is used. On NT, a similar accuracy
 >     truncation mechanism is used by default. On Solaris, all
 >     accuracy is 64bit.
 >
 >     W.
 >
 >http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=10772
 
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