Runtime SEGV from gcc -O3 -march=native

Runtime SEGV from gcc -O3 -march=native

[Joseph Quinsey]

FYI. Source code:

int main(void) {
    static int foo[4];
    int bar[4];
    int i;
    for (i = 0; i < 4; i++)
        foo[i] = bar[i];
    return 0;
}

Compile and run, using Cygwin's current gcc version 4.3.4: 

    gcc -O3 -march=native foobar.c
    a.exe
    Segmentation fault (core dumped)

I've submitted a bug report to gcc, and it has been flagged as a duplicate
of the 2008 report: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216



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Re: Runtime SEGV from gcc -O3 -march=native

[Yaakov (Cygwin/X)]

On Thu, 2010-07-22 at 22:16 -0400, Joseph Quinsey wrote:
> I've submitted a bug report to gcc, and it has been flagged as a duplicate
> of the 2008 report: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216

It is indicated there that this has been fixed for gcc-4.5, which should
be available soon for Cygwin.  I can confirm that is is fixed in my
mingw builds of the latest 4.5 snapshots.


Yaakov



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Re: Runtime SEGV from gcc -O3 -march=native

[Huang Bambo]

Use -O2 instead, I also have trouble on use -O3.

2010/7/27 Joseph Quinsey <jquinsey@entrenet.com>:
> Again, just FYI, with a simpler example, and with -march=native replaced by
> k8 or athlon64.
>
> Source code:
>
> int main(void) {
>    static int foo[4];
>    int i;
>    for (i = 0; i < 4; i++)
>        foo[i] = 0;
>    return 0;
> }
>
> Compile and run, using Cygwin's current gcc version 4.3.4:
>
>    gcc -O3 -march=athlon64 foobar.c
>    ./a.exe
>    Segmentation fault (core dumped)
>
>
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RE: Runtime SEGV from gcc -O3 -march=native

[Joseph Quinsey]

Again, just FYI, with a simpler example, and with -march=native replaced by
k8 or athlon64.

Source code:

int main(void) {
    static int foo[4];
    int i;
    for (i = 0; i < 4; i++)
        foo[i] = 0;
    return 0;
}

Compile and run, using Cygwin's current gcc version 4.3.4: 

    gcc -O3 -march=athlon64 foobar.c
    ./a.exe
    Segmentation fault (core dumped)


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