Re: [Valgrind-developers] another false positive?

[Julian S. <js...@ac...>]

I need to see the IR (internal intermediate representation) created for=20
these blocks.  Can you run with

=2D-tool=3Dnone --trace-flags=3D10001000 --vex-guest-chase-thresh=3D0 --tra=
ce-notbelow=3D0

which will give you many megabytes of log file.  Then find and send the
presumably 3 blocks which pertain to this function.  The blocks in the log
have their function name + offset attached so it is easy to find them.
Thanks.

J


On Sunday 29 October 2006 02:05, Rafael Esp=EDndola wrote:
> Reducing a function in qt4 to fix a warning about a branch depending
> on uninitialised values, I ended up with
> --------------------------------
> _ZN18QRasterPaintEngine12updateMatrixERK7QMatrix:
>         movl    4(%esp), %eax
>         movl    16(%eax), %ecx
>
>         fldz
>         fldz
>         fxch    %st(1)
>         fucompp
>         fnstsw  %ax
>         sahf
>         jp      .L262
>
>         andb    $128, 8761(%ecx)
>
>         fldz
>         fldz
>         fxch    %st(1)
>         fucompp
>         fnstsw  %ax
>         sahf
>         jp      1.L262
>
> .L262:
>         ret
> ---------------------------------------
>
> Note that the code does two identical fp compares. Valgrind gives a
> warning only on the second "jp". If the "andb" instruction is removed,
> the warning disappears.
>
> Any suggestions on where to look in the code?
>
> Thanks,
> Rafael
>
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