Re: [PATCH] x86: generalize gas documentation for disabling of ISA extensions

["H.J. Lu" <hjl.tools@gmail.com>]

On Mon, Oct 17, 2022 at 1:30 AM Jan Beulich <jbeulich@suse.com> wrote:
>
> As of commit ae89daecb132 ("x86: generalize disabling of sub-
> architectures") there's no arbitrary subset of ISAs which can also be
> disabled. This should have been reflected in documentation right away.
> Since I failed to do so, correct this now.
>
> --- a/gas/doc/c-i386.texi
> +++ b/gas/doc/c-i386.texi
> @@ -137,16 +137,9 @@ accept various extension mnemonics.  For
>  @code{287},
>  @code{387},
>  @code{687},
> -@code{no87},
> -@code{no287},
> -@code{no387},
> -@code{no687},
>  @code{cmov},
> -@code{nocmov},
>  @code{fxsr},
> -@code{nofxsr},
>  @code{mmx},
> -@code{nommx},
>  @code{sse},
>  @code{sse2},
>  @code{sse3},
> @@ -155,18 +148,8 @@ accept various extension mnemonics.  For
>  @code{sse4.1},
>  @code{sse4.2},
>  @code{sse4},
> -@code{nosse},
> -@code{nosse2},
> -@code{nosse3},
> -@code{nosse4a},
> -@code{nossse3},
> -@code{nosse4.1},
> -@code{nosse4.2},
> -@code{nosse4},
>  @code{avx},
>  @code{avx2},
> -@code{noavx},
> -@code{noavx2},
>  @code{adx},
>  @code{rdseed},
>  @code{prfchw},
> @@ -189,9 +172,7 @@ accept various extension mnemonics.  For
>  @code{serialize},
>  @code{tsxldtrk},
>  @code{kl},
> -@code{nokl},
>  @code{widekl},
> -@code{nowidekl},
>  @code{hreset},
>  @code{avx512f},
>  @code{avx512cd},
> @@ -213,37 +194,9 @@ accept various extension mnemonics.  For
>  @code{avx512_bf16},
>  @code{avx_vnni},
>  @code{avx512_fp16},
> -@code{noavx512f},
> -@code{noavx512cd},
> -@code{noavx512er},
> -@code{noavx512pf},
> -@code{noavx512vl},
> -@code{noavx512bw},
> -@code{noavx512dq},
> -@code{noavx512ifma},
> -@code{noavx512vbmi},
> -@code{noavx512_4fmaps},
> -@code{noavx512_4vnniw},
> -@code{noavx512_vpopcntdq},
> -@code{noavx512_vbmi2},
> -@code{noavx512_vnni},
> -@code{noavx512_bitalg},
> -@code{noavx512_vp2intersect},
> -@code{notdx},
> -@code{noavx512_bf16},
> -@code{noavx_vnni},
> -@code{noavx512_fp16},
> -@code{noenqcmd},
> -@code{noserialize},
> -@code{notsxldtrk},
>  @code{amx_int8},
> -@code{noamx_int8},
>  @code{amx_bf16},
> -@code{noamx_bf16},
>  @code{amx_tile},
> -@code{noamx_tile},
> -@code{nouintr},
> -@code{nohreset},
>  @code{vmx},
>  @code{vmfunc},
>  @code{smx},
> @@ -291,8 +244,8 @@ accept various extension mnemonics.  For
>  @code{tlbsync},
>  @code{svme} and
>  @code{padlock}.
> -Note that rather than extending a basic instruction set, the extension
> -mnemonics starting with @code{no} revoke the respective functionality.
> +Note that these extension mnemonics can be prefixed with @code{no} to revoke
> +the respective (and any dependent) functionality.
>
>  When the @code{.arch} directive is used with @option{-march}, the
>  @code{.arch} directive will take precedent.
> @@ -1559,6 +1512,9 @@ conditional jumps will be promoted when
>  sequence consisting of a conditional jump of the opposite sense around
>  an unconditional jump to the target.
>
> +Note that the sub-architecture specifiers (starting with a dot) can be prefixed
> +with @code{no} to revoke the respective (and any dependent) functionality.
> +
>  Following the CPU architecture (but not a sub-architecture, which are those
>  starting with a dot), you may specify @samp{jumps} or @samp{nojumps} to
>  control automatic promotion of conditional jumps. @samp{jumps} is the

OK.

Thanks.

-- 
H.J.