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[Bug target/37390] wrong-code on i486-linux-gnu with -O[12], -O0 works
- From: "pinskia at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 6 Sep 2008 17:56:13 -0000
- Subject: [Bug target/37390] wrong-code on i486-linux-gnu with -O[12], -O0 works
- References: <bug-37390-11764@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #5 from pinskia at gmail dot com 2008-09-06 17:56 -------
Subject: Re: wrong-code on i486-linux-gnu with -O[12], -O0 works
Sent from my iPhone
On Sep 6, 2008, at 10:42, "niklaus at gmail dot com" <gcc-bugzilla@gcc.gnu.org
> wrote:
>
>
> ------- Comment #4 from niklaus at gmail dot com 2008-09-06 17:42
> -------
> On the below version of gcc on cygwin (winXP SP3) i don't have any
> problems
> with optimization on or off. They produce consistent correct result.
> Why is it
> a problem with linux ? or am i doing something wrong.
Because on x86 gnu/Linux, the precision is set to 80bits rather than
64bit like it is on windows.
>
>
> I tried gcc -mfpmath=387 a.c -O2 and without -O2 , still the same
> correct
> results on both.
>
> Even with -ffloat-store . Is it glibc ?
>
> $ gcc -v
> Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs
> Configured with: /usr/build/package/orig/test.respin/gcc-3.4.4-3/
> configure
> --verbose --prefix=/usr -
> -exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/
> usr/lib
> --mandir=/usr/share/man
> --infodir=/usr/share/info --enable-languages=c,ada,c+
> +,d,f77,pascal,java,objc
> --enable-nls --without
> -included-gettext --enable-version-specific-runtime-libs --without-x
> --enable-libgcj --disable-java-
> awt --with-system-zlib --enable-interpreter --disable-libgcj-debug
> --enable-threads=posix --enable-j
> ava-gc=boehm --disable-win32-registry --enable-sjlj-exceptions
> --enable-hash-synchronization --enabl
> e-libstdcxx-debug
> Thread model: posix
> gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125)
>
> $
>
>
> --
>
> niklaus at gmail dot com changed:
>
> What |Removed |Added
> ---
> ---
> ----------------------------------------------------------------------
> CC| |niklaus at gmail dot
> com
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37390
>
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37390