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From: omarbeo@hotmail.com To: gcc-gnats@gcc.gnu.org Subject: optimization/10772: Result differences between debug and optmize libs on linux; and with sol/nt on optimize mode Date: Tue, 13 May 2003 18:26:00 -0000 [thread overview] Message-ID: <20030513181736.10784.qmail@sources.redhat.com> (raw) >Number: 10772 >Category: optimization >Synopsis: Result differences between debug and optmize libs on linux; and with sol/nt on optimize mode >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Tue May 13 18:26:00 UTC 2003 >Closed-Date: >Last-Modified: >Originator: omarbeo@hotmail.com >Release: GCC 3.2 >Organization: >Environment: >Description: Hi, I'm seeing differences between nt/sol and linux when i run my application; i'm not sure if this a bug or not. the interresting thing is that linux-64 optmize and linux-32 debug results will match the nt/sol results. Here the code: double get_p() { ... }; // multiple oprations: multiplication, division,.. int get_p() { ... } double a; int res; a = ( (double) get_p() . get_g()); res = (int) a; i run this test on nt, unix, and linux platforms. nt and unix (sol) match, while linux data don't (off by 1 unit). when i run this test using linux debug libs, the results maches those of nt/sol! So i'm not sure why this is happening? This could be caused by us not rounding the numbers; but then why linux results differ based on how we build the libs ( optimize and debug). Thanks, salim >How-To-Repeat: >Fix: I'm attaching the Assemly code generated on linux in debug and optmize mode. I found a workaround which will make linux match the two other platforms as follow: static bool turn_off = false .. a = ( (double) get_p() . get_g()); if (turn_off) printf("", a) res = (int) a; >Release-Note: >Audit-Trail: >Unformatted:
next reply other threads:[~2003-05-13 18:26 UTC|newest] Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top 2003-05-13 18:26 omarbeo [this message] 2003-05-14 6:26 Dara Hazeghi 2003-05-14 10:48 giovannibajo 2003-05-14 14:36 Christian Ehrhardt 2003-05-14 15:14 bangerth 2003-05-14 15:16 omar beo 2003-05-14 19:26 omar beo 2003-05-14 20:56 Wolfgang Bangerth
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