[Valgrind-users] REPE then 0xF

[Dominic M. <dma...@ai...>]

Was anyone else able to reproduce the REPE then 0xF problem using my test 
program?  Just curious...

- Dominic

> Message: 10
> Date: Mon, 28 Apr 2003 19:21:08 -0700 (PDT)
> From: Dominic Mazzoni <dma...@ai...>
> To: val...@li...
> Subject: Re: [Valgrind-users] Need test case for: REPE then 0xF: Unhandled
>  REPE case
> 
> Here's a very short test program that produces this error for me.  I'm 
> using a Pentium 3, though, not a Pentium 4.  The problem only happens if I 
> use the -march=pentium3 option with gcc 3.x.
> 
> Test program:
> 
> #include <stdio.h>
> #include <stdlib.h>
> 
> int main(int argc, char **argv)
> {
>    float f = rand() / (float)RAND_MAX;
>    printf("f=%f\n", f);
> 
>    return 0;
> }
> 
> Compilation line:
> 
>   gcc -march=pentium3 foo.c
> 
> > gcc -v
> Thread model: posix
> gcc version 3.2
> 
> > valgrind --version
> valgrind-1.9.4
> 
> I hope this helps!
> 
> - Dominic
> 
> ---------------------------------------------------------------
> 
> From: Julian Seward <js...@ac...>
> To: val...@li...
> Date: Sun, 27 Apr 2003 00:13:43 +0100
> Subject: [Valgrind-users] Need test case for: REPE then 0xF: Unhandled 
> REPE
> case
> 
> 
> Hello.  I'm trying to put together bug fixes for 1.9.6.
> 
> Several people reported this panic:
> 
>    REPE then 0xF
> 
>    valgrind: the `impossible' happened:
>       Unhandled REPE case
> 
> I'd like to fix it, since it seems to afflict quite a number
> of people.  However, reading my Intel P4 documentation I can't
> figure out what instruction this is.
> 
> So: does anyone have a smallish test case I can use to reproduce
> this with?  Or (not so good, but it would be a help) can anyone
> tell me what the byte after the 0xF is?  You can find out
> by changing vg_to_ucode.c:4321 from
> 
>          VG_(printf)("REPE then 0x%x\n", (UInt)abyte);
> 
> to
> 
>          VG_(printf)("REPE then 0x%x 0x%x\n", (UInt)abyte,
>                                               (UInt)getUChar(eip));
> 
> I prefer a test case tho, so I can test any fix I make.
> 
> Thanks,
> 
> J
> 
> 
> 
> 
> 
> 
> --__--__--
> 
> _______________________________________________
> Valgrind-users mailing list
> Val...@li...
> https://lists.sourceforge.net/lists/listinfo/valgrind-users
> 
> 
> End of Valgrind-users Digest
>