linux-kernel - Re: [PATCH] x86/math-emu: Add support for FCMOVcc and F[U]COMI[P] insns

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Date:	Mon, 24 Aug 2015 08:50:10 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...capital.net>,
	Kees Cook <keescook@...omium.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/math-emu: Add support for FCMOVcc and F[U]COMI[P]
 insns


* Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Denys Vlasenko <dvlasenk@...hat.com> wrote:
> 
> > I propose the table to be commented like shown below:
> > 
> > /*Opcode: d8      d9        da      db       dc      dd      de      df */
> > /*c0..f*/ fadd__, fld_i_,   fcmovb, fcmovnb, fadd_i, ffree_, faddp_, _df_c0_,
> > /*c8..f*/ fmul__, fxch_i,   fcmove, fcmovne, fmul_i, _dd_c8_,fmulp_, _df_c8_,
> > /*d0..7*/ fcom_st,fp_nop,   fcmovbe,fcmovnbe,_dc_d0_,fst_i_, _de_d0_,_df_d0_,
> > /*d8..f*/ fcompst,_d9_d8_,  fcmovu, fcmovnu, _dc_d8_,fstp_i, fcompp, _df_d8_,
> > /*e0..7*/ fsub__, FPU_etc,  __BAD__,finit_,  fsubri, fucom_, fsubrp, fstsw_,
> > /*e8..f*/ fsubr_, fconst,   fucompp,fucomi_, fsub_i, fucomp, fsubp_, fucomip,
> > /*f0..7*/ fdiv__, FPU_triga,__BAD__,fcomi_,  fdivri, __BAD__,fdivrp, fcomip,
> > /*f8..f*/ fdivr_, FPU_trigb,__BAD__,__BAD__, fdiv_i, __BAD__,fdivp_, __BAD__,
> 
> I agree with that, but please fix the vertical alignment (like my patch did), as 
> the table is pretty hard to navigate in this form.

and by that I mean to split each line into two, to have groups of 4 instructions 
and enough tabs between them.

> Also, the first patch in the series should remove the 'undocumented' #ifdef. 
> That define was fully justified ~20 years ago but let's not complicate new code 
> with it.

The formerly undocumented opcodes could also grow real names.

All in nicely separate patches.

Thanks,

	Ingo
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