[PATCH 37/40] i386: Allow MMX intrinsic emulation with SSE
H.J. Lu
hjl.tools@gmail.com
Thu Feb 14 23:13:00 GMT 2019
On Thu, Feb 14, 2019 at 2:57 PM Uros Bizjak <ubizjak@gmail.com> wrote:
>
> On Thu, Feb 14, 2019 at 10:02 PM H.J. Lu <hjl.tools@gmail.com> wrote:
>
> > > > > > gcc/
> > > > > >
> > > > > > PR target/89021
> > > > > > * config/i386/i386-builtin.def: Enable MMX intrinsics with
> > > > > > SSE/SSE2/SSSE3.
> > > > > > * config/i386/i386.c (ix86_option_override_internal): Don't
> > > > > > enable MMX ISA with TARGET_MMX_WITH_SSE by default.
> > > > > > (ix86_init_mmx_sse_builtins): Enable MMX intrinsics with
> > > > > > SSE/SSE2/SSSE3.
> > > > > > (ix86_expand_builtin): Allow SSE/SSE2/SSSE3 to emulate MMX
> > > > > > intrinsics with TARGET_MMX_WITH_SSE.
> > > > > > * config/i386/mmintrin.h: Don't require MMX in 64-bit mode.
> > > > > >
> > > >
> > > > >
> > > > > > diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
> > > > > > index a9abbe8706b..1d417e08734 100644
> > > > > > --- a/gcc/config/i386/i386.c
> > > > > > +++ b/gcc/config/i386/i386.c
> > > > > > @@ -4165,12 +4165,15 @@ ix86_option_override_internal (bool main_args_p,
> > > > > > opts->x_target_flags
> > > > > > |= TARGET_SUBTARGET64_DEFAULT & ~opts_set->x_target_flags;
> > > > > >
> > > > > > - /* Enable by default the SSE and MMX builtins. Do allow the user to
> > > > > > - explicitly disable any of these. In particular, disabling SSE and
> > > > > > - MMX for kernel code is extremely useful. */
> > > > > > + /* Enable the SSE and MMX builtins by default. Don't enable MMX
> > > > > > + ISA with TARGET_MMX_WITH_SSE by default. Do allow the user to
> > > > > > + explicitly disable any of these. In particular, disabling SSE
> > > > > > + and MMX for kernel code is extremely useful. */
> > > > > > if (!ix86_arch_specified)
> > > > > > opts->x_ix86_isa_flags
> > > > > > - |= ((OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE | OPTION_MASK_ISA_MMX
> > > > > > + |= ((OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE
> > > > > > + | (TARGET_MMX_WITH_SSE_P (opts->x_ix86_isa_flags)
> > > > > > + ? 0 : OPTION_MASK_ISA_MMX)
> > > > > > | TARGET_SUBTARGET64_ISA_DEFAULT)
> > > > > > & ~opts->x_ix86_isa_flags_explicit);
> > > > >
> > > > > Please split the above into two clauses, the first that sets SSE and
> > > > > MMX by default, and the second to or with
> > > > >
> > > > > opts->x_ix86_isa_flags
> > > > > |= TARGET_SUBTARGET64_ISA_DEFAULT & ~opts->x_ix86_isa_flags_explicit
> > > > >
> > > >
> > > > Like this?
> > >
> > > Yes, but also split the comment.
> >
> > I will go with
> >
> > /* Enable by default the SSE and MMX builtins. Do allow the user to
> > explicitly disable any of these. In particular, disabling SSE and
> > MMX for kernel code is extremely useful. */
> > if (!ix86_arch_specified)
> > {
> > /* Don't enable MMX ISA with TARGET_MMX_WITH_SSE. */
> > opts->x_ix86_isa_flags
> > |= ((OPTION_MASK_ISA_SSE2 | OPTION_MASK_ISA_SSE
> > | (TARGET_MMX_WITH_SSE_P (opts->x_ix86_isa_flags)
> > ? 0 : OPTION_MASK_ISA_MMX))
> > & ~opts->x_ix86_isa_flags_explicit);
> > opts->x_ix86_isa_flags
> > |= (TARGET_SUBTARGET64_ISA_DEFAULT
> > & ~opts->x_ix86_isa_flags_explicit);
> > }
>
> I'll commit the following patch that finally defines
> TARGET_SUBTARGET64_ISA_DEFAULT. You could then simply clear the MMX
> bit from x_i86_isa_flags, like:
>
> if (!ix86_arch_specified)
> opts->x_ix86_isa_flags
> |= TARGET_SUBTARGET64_ISA_DEFAULT & ~opts->x_ix86_isa_flags_explicit;
>
> /* Don't enable MMX ISA with TARGET_MMX_WITH_SSE. */
> if (TARGET_MMX_WITH_SSE_P (opts->x_ix86_isa_flags))
> opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_MMX;
I think it should be:
/* Don't enable MMX ISA with TARGET_MMX_WITH_SSE. */
if (!(opts->x_ix86_isa_flags & OPTION_MASK_ISA_MMX)
&& TARGET_MMX_WITH_SSE_P (opts->x_ix86_isa_flags))
opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_MMX;
Thanks.
--
H.J.
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