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Re: PIII SIMD support in gas
- To: alan@SPRI.Levels.UniSA.Edu.Au (Alan Modra)
- Subject: Re: PIII SIMD support in gas
- From: hjl@lucon.org (H.J. Lu)
- Date: Fri, 21 May 1999 19:41:12 -0700 (PDT)
- Cc: dledford@redhat.com, binutils@sourceware.cygnus.com
>
>
> On Wed, 19 May 1999, H.J. Lu wrote:
>
> > > If anyone else would like to help with this, make sure that %cr4 bit 9
> > > is set, %cr0 bit 2 is reset, set %eax and %ecx to -1, then execute the
> > > following opcode on a PIII under gdb, and tell me whether %eax or %ecx is
> > > modified.
> > >
> > > 0x0f,0x50,0xc1 # movmskps
> >
> > I don't know which patch from Doug you used. I fixed some P/III bugs
> > in 2.9.1.0.24. It seems to work fine on P/III. You can always get
> > binutils 2.9.1.0.24 and compare the result against gas in CVS.
>
> Yes, I know about the fixes you put in. The cygnus i386 gas doesn't have
> the RegRegmem problem you fixed.
>
> When you say "It seems to work fine", do you mean you have executed the
> code generated by movmskps on a PIII? As far as I know, this is the only
> SIMD instruction that your binutils generates a different modrm byte to
> the cygnus binutils. The cygnus binutils follows the Intel documentation
> on this instruction; It's just that I strongly suspect Intel got it
> wrong.
>
>
--
H.J. Lu (hjl@gnu.org)