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From: warren@eng.up.ac.za To: gcc-gnats@gcc.gnu.org Subject: other/8974: fabs error with -ansi Date: Tue, 17 Dec 2002 02:16:00 -0000 [thread overview] Message-ID: <20021217100846.27222.qmail@sources.redhat.com> (raw) >Number: 8974 >Category: other >Synopsis: fabs error with -ansi >Confidential: no >Severity: serious >Priority: medium >Responsible: unassigned >State: open >Class: sw-bug >Submitter-Id: net >Arrival-Date: Tue Dec 17 02:16:01 PST 2002 >Closed-Date: >Last-Modified: >Originator: Warren du Plessis >Release: unknown-1.0 >Organization: >Environment: Output of gcc -v Configured with: /var/tmp/portage/gcc-3.2-r1/work/gcc-3.2/configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --target=i686-pc-linux-gnu --with-system-zlib --enable-languages=c,c++,ada,f77,objc,java --enable-threads=posix --enable-long-long --disable-checking --enable-cstdio=stdio --enable-clocale=generic --enable-__cxa_atexit --enable-version-specific-runtime-libs --with-gxx-include-dir=/usr/include/g++-v32 --with-local-prefix=/usr/local --enable-shared --enable-nls --without-included-gettext Thread model: posix gcc version 3.2 >Description: fabs() gives garbage (output included below) when I compile the code below with gcc 3.2 with the -ansi flag and run it on a PentiumIV 2.4 GHz I have access to. The same code compiled with any other version of gcc or with icc works properly. Running the same binary on a different spec machine works properly, but gives the same problem on other machines of the same type. The problem only occurs when the -ansi flag is used (When I compile the code below with: gcc -ansi -lm -o test test.c it gives problems, but when I compile with: gcc -lm -o test test.c it works properly.). Source file: /* Test fabs problem */ #include<stdio.h> #include<math.h> int main() { int count1; double value; /* Use a loop to show the behaviour as the values change. */ for(count1 = 0; count1 < 8; count1++) { value = -1.35 + 0.01*count1; printf("%f\t%f\n", value, fabs(value)); } /* Just to prove that the same thing happens with constants. */ printf("\n%f\t%f\n", -1.29, fabs(-1.29)); printf("%f\t%f\n", -1.28, fabs(-1.28)); return 0; } Output: -1.350000 0.000000 -1.340000 1972025612002701974956562650445561404174954378236176687125875831578843553978832422898371277103679201670561005568.000000 -1.330000 0.000000 -1.320000 427698125597735782527681486701155185015946591284413207628408209475262279918486665822208.000000 -1.310000 0.000000 -1.300000 92559680389175149863256792315491644408430319360732995401023488.000000 -1.290000 0.000000 -1.280000 19991593113087055742149331948245352448.000000 -1.290000 0.000000 -1.280000 19991593113087055742149331948245352448.000000 >How-To-Repeat: Compile and run on a similar machine. >Fix: >Release-Note: >Audit-Trail: >Unformatted: ----gnatsweb-attachment---- Content-Type: application/gzip; 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next reply other threads:[~2002-12-17 10:16 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2002-12-17 2:16 warren [this message] 2002-12-20 19:37 bangerth 2002-12-23 2:26 Warren du Plessis 2003-05-12 11:46 steven
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