[PATCH] Add the member integer_to_sse to processor_cost as a cost simulation for movd/pinsrd. It will be used to calculate the cost of vec_construct.

Richard Biener richard.guenther@gmail.com
Tue Aug 3 10:20:39 GMT 2021


On Tue, Aug 3, 2021 at 11:20 AM Richard Biener
<richard.guenther@gmail.com> wrote:
>
> On Wed, Jul 28, 2021 at 4:51 AM Hongtao Liu via Gcc-patches
> <gcc-patches@gcc.gnu.org> wrote:
> >
> > On Tue, Jul 27, 2021 at 9:54 AM Hongtao Liu <crazylht@gmail.com> wrote:
> > >
> > > On Mon, Jul 26, 2021 at 4:49 PM Hongtao Liu <crazylht@gmail.com> wrote:
> > > >
> > > > Correct mail list, please reply under this email.
> > > >
> > > > On Mon, Jul 26, 2021 at 4:47 PM liuhongt <hongtao.liu@intel.com> wrote:
> > > > >
> > > > > Hi:
> > > > >   As decribled in PR, the pinsr instruction has poor throughput in SKX
> > > > > and CLX, which leads to worse performance in vectorization in some cases.
> > > > > This patch adds a cost member named integer_to_sse to simulate pinsr/movd
> > > > > which is used by vector construction, the cost is same as sse_op on other
> > > > >  targets, but twice much as sse_op on CLX/SKX.
> > > > >   Bootstrapped and regtested on x86_64-linux-gnu{-m32,}.
> > > > >   Ok for trunk?
> > > > >
> > > I'm going to check in this patch if there's no objection.
> > Pushed to trunk.
>
>           /* N element inserts into SSE vectors.  */
> -         int cost = TYPE_VECTOR_SUBPARTS (vectype) * ix86_cost->sse_op;
> +         int cost
> +           = TYPE_VECTOR_SUBPARTS (vectype) * (fp ?
> +                                               ix86_cost->sse_op
> +                                               : ix86_cost->integer_to_sse);
> +
>
> so that's costing movd and pinsr the same, shouldn't we try to separate this
> by doing
>
>          /* N element inserts into SSE vectors.  */
>          int cost = TYPE_VECTOR_SUBPARTS (vectype) * ix86_cost->sse_op;
>          /* Account for int->SSE reg moves.  */
>          if (!fp)
>            cost += TYPE_VECTOR_SUBPARTS (vectype) * ix86_cost->integer_to_sse;
>
> ?  pinsr is only supported with SSE4+ IIRC.  Note we also have
>
>       case vec_to_scalar:
>       case scalar_to_vec:
>         return ix86_vec_cost (mode, ix86_cost->sse_op);
>
> where scalar_to_vec is used to cost splats and vec_to_scalar is used
> to cost element extracts.  Both lack costing of the move part.
>
> I realize we have GPR to XMM inserts which cover both the "move" and
> the insert but then calling this 'integer_to_sse' is a bit odd.  The extract
> cost also depends on the element number for AVX2/AVX512F.  The
> vectorizer usually decomposes a vector fully and never does single
> element extracts so the vextract128 cost amortizes.
>
> That said, the change leaves all targets besides skylake_cost with
> not so great defaults I think.  For skylake you effectively add another
> sse_op for the int->SSE move plus '1' (for whatever reason).  I think
> that's reasonable for all targets.
>
> It does look a bit odd to have
>
>    8,                                   /* cost of moving SSE register to intege
> r.  */
>   COSTS_N_INSNS (1),                   /* cost of moving integer to sse registe
> r.  */
>
> where sse_to_integer is used by the STV pass which mixes
> CONST_N_INSNS scaled costs and unscaled costs (ick).

Debugging some eventually related thing I applied the same costing
as you did to skylake_cost to znver2_cost and figured that
538.imagick_r regresses by 23% at -Ofast -march=znver2 by such
change.  So it seems changes here indeed need careful benchmarking.

Richard.

> Richard.
>
> > > > > gcc/ChangeLog:
> > > > >
> > > > >         PR target/99881
> > > > >         * config/i386/i386.h (processor_costs): Add new member
> > > > >         integer_to_sse.
> > > > >         * config/i386/x86-tune-costs.h (ix86_size_cost, i386_cost,
> > > > >         i486_cost, pentium_cost, lakemont_cost, pentiumpro_cost,
> > > > >         geode_cost, k6_cost, athlon_cost, k8_cost, amdfam10_cost,
> > > > >         bdver_cost, znver1_cost, znver2_cost, znver3_cost,
> > > > >         btver1_cost, btver2_cost, btver3_cost, pentium4_cost,
> > > > >         nocona_cost, atom_cost, atom_cost, slm_cost, intel_cost,
> > > > >         generic_cost, core_cost): Initialize integer_to_sse same value
> > > > >         as sse_op.
> > > > >         (skylake_cost): Initialize integer_to_sse twice as much as sse_op.
> > > > >         * config/i386/i386.c (ix86_builtin_vectorization_cost):
> > > > >         Use integer_to_sse instead of sse_op to calculate the cost of
> > > > >         vec_construct.
> > > > >
> > > > > gcc/testsuite/ChangeLog:
> > > > >
> > > > >         PR target/99881
> > > > >         * gcc.target/i386/pr99881.c: New test.
> > > > > ---
> > > > >  gcc/config/i386/i386.c                  |  6 ++-
> > > > >  gcc/config/i386/i386.h                  |  1 +
> > > > >  gcc/config/i386/x86-tune-costs.h        | 26 +++++++++++++
> > > > >  gcc/testsuite/gcc.target/i386/pr99881.c | 49 +++++++++++++++++++++++++
> > > > >  4 files changed, 81 insertions(+), 1 deletion(-)
> > > > >  create mode 100644 gcc/testsuite/gcc.target/i386/pr99881.c
> > > > >
> > > > > diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
> > > > > index ff96134fb37..fbebd2d8f9a 100644
> > > > > --- a/gcc/config/i386/i386.c
> > > > > +++ b/gcc/config/i386/i386.c
> > > > > @@ -22051,7 +22051,11 @@ ix86_builtin_vectorization_cost (enum vect_cost_for_stmt type_of_cost,
> > > > >        case vec_construct:
> > > > >         {
> > > > >           /* N element inserts into SSE vectors.  */
> > > > > -         int cost = TYPE_VECTOR_SUBPARTS (vectype) * ix86_cost->sse_op;
> > > > > +         int cost
> > > > > +           = TYPE_VECTOR_SUBPARTS (vectype) * (fp ?
> > > > > +                                               ix86_cost->sse_op
> > > > > +                                               : ix86_cost->integer_to_sse);
> > > > > +
> > > > >           /* One vinserti128 for combining two SSE vectors for AVX256.  */
> > > > >           if (GET_MODE_BITSIZE (mode) == 256)
> > > > >             cost += ix86_vec_cost (mode, ix86_cost->addss);
> > > > > diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
> > > > > index 0c2c93daf32..d1e1c225990 100644
> > > > > --- a/gcc/config/i386/i386.h
> > > > > +++ b/gcc/config/i386/i386.h
> > > > > @@ -165,6 +165,7 @@ struct processor_costs {
> > > > >    const int xmm_move, ymm_move, /* cost of moving XMM and YMM register.  */
> > > > >             zmm_move;
> > > > >    const int sse_to_integer;    /* cost of moving SSE register to integer.  */
> > > > > +  const int integer_to_sse;    /* cost of moving integer to SSE register.  */
> > > > >    const int gather_static, gather_per_elt; /* Cost of gather load is computed
> > > > >                                    as static + per_item * nelts. */
> > > > >    const int scatter_static, scatter_per_elt; /* Cost of gather store is
> > > > > diff --git a/gcc/config/i386/x86-tune-costs.h b/gcc/config/i386/x86-tune-costs.h
> > > > > index ffe810f2bcb..67cfa006196 100644
> > > > > --- a/gcc/config/i386/x86-tune-costs.h
> > > > > +++ b/gcc/config/i386/x86-tune-costs.h
> > > > > @@ -102,6 +102,7 @@ struct processor_costs ix86_size_cost = {/* costs for tuning for size */
> > > > >                                            in 128bit, 256bit and 512bit */
> > > > >    3, 3, 3,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    3,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_BYTES (2),                   /* cost of moving integer to sse register.  */
> > > > >    5, 0,                                        /* Gather load static, per_elt.  */
> > > > >    5, 0,                                        /* Gather store static, per_elt.  */
> > > > >    0,                                   /* size of l1 cache  */
> > > > > @@ -211,6 +212,7 @@ struct processor_costs i386_cost = {        /* 386 specific costs */
> > > > >    {4, 8, 16, 32, 64},                  /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    3,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    4, 4,                                        /* Gather load static, per_elt.  */
> > > > >    4, 4,                                        /* Gather store static, per_elt.  */
> > > > >    0,                                   /* size of l1 cache  */
> > > > > @@ -319,6 +321,7 @@ struct processor_costs i486_cost = {        /* 486 specific costs */
> > > > >    {4, 8, 16, 32, 64},                  /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    3,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    4, 4,                                        /* Gather load static, per_elt.  */
> > > > >    4, 4,                                        /* Gather store static, per_elt.  */
> > > > >    4,                                   /* size of l1 cache.  486 has 8kB cache
> > > > > @@ -429,6 +432,7 @@ struct processor_costs pentium_cost = {
> > > > >    {4, 8, 16, 32, 64},                  /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    3,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    4, 4,                                        /* Gather load static, per_elt.  */
> > > > >    4, 4,                                        /* Gather store static, per_elt.  */
> > > > >    8,                                   /* size of l1 cache.  */
> > > > > @@ -530,6 +534,7 @@ struct processor_costs lakemont_cost = {
> > > > >    {4, 8, 16, 32, 64},                  /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    3,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    4, 4,                                        /* Gather load static, per_elt.  */
> > > > >    4, 4,                                        /* Gather store static, per_elt.  */
> > > > >    8,                                   /* size of l1 cache.  */
> > > > > @@ -646,6 +651,7 @@ struct processor_costs pentiumpro_cost = {
> > > > >    {4, 8, 16, 32, 64},                  /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    3,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    4, 4,                                        /* Gather load static, per_elt.  */
> > > > >    4, 4,                                        /* Gather store static, per_elt.  */
> > > > >    8,                                   /* size of l1 cache.  */
> > > > > @@ -753,6 +759,7 @@ struct processor_costs geode_cost = {
> > > > >    {2, 2, 8, 16, 32},                   /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    6,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    2, 2,                                        /* Gather load static, per_elt.  */
> > > > >    2, 2,                                        /* Gather store static, per_elt.  */
> > > > >    64,                                  /* size of l1 cache.  */
> > > > > @@ -860,6 +867,7 @@ struct processor_costs k6_cost = {
> > > > >    {2, 2, 8, 16, 32},                   /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    6,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    2, 2,                                        /* Gather load static, per_elt.  */
> > > > >    2, 2,                                        /* Gather store static, per_elt.  */
> > > > >    32,                                  /* size of l1 cache.  */
> > > > > @@ -973,6 +981,7 @@ struct processor_costs athlon_cost = {
> > > > >    {4, 4, 10, 10, 20},                  /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    5,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (2),                   /* cost of moving integer to sse register.  */
> > > > >    4, 4,                                        /* Gather load static, per_elt.  */
> > > > >    4, 4,                                        /* Gather store static, per_elt.  */
> > > > >    64,                                  /* size of l1 cache.  */
> > > > > @@ -1088,6 +1097,7 @@ struct processor_costs k8_cost = {
> > > > >    {4, 4, 10, 10, 20},                  /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    5,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (2),                   /* cost of moving integer to sse register.  */
> > > > >    4, 4,                                        /* Gather load static, per_elt.  */
> > > > >    4, 4,                                        /* Gather store static, per_elt.  */
> > > > >    64,                                  /* size of l1 cache.  */
> > > > > @@ -1216,6 +1226,7 @@ struct processor_costs amdfam10_cost = {
> > > > >    {4, 4, 5, 10, 20},                   /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    3,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (2),                   /* cost of moving integer to sse register.  */
> > > > >    4, 4,                                        /* Gather load static, per_elt.  */
> > > > >    4, 4,                                        /* Gather store static, per_elt.  */
> > > > >    64,                                  /* size of l1 cache.  */
> > > > > @@ -1336,6 +1347,7 @@ const struct processor_costs bdver_cost = {
> > > > >    {10, 10, 10, 40, 60},                        /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    16,                                  /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (2),                   /* cost of moving integer to sse register.  */
> > > > >    12, 12,                              /* Gather load static, per_elt.  */
> > > > >    10, 10,                              /* Gather store static, per_elt.  */
> > > > >    16,                                  /* size of l1 cache.  */
> > > > > @@ -1477,6 +1489,7 @@ struct processor_costs znver1_cost = {
> > > > >    {8, 8, 8, 16, 32},                   /* cost of unaligned stores.  */
> > > > >    2, 3, 6,                             /* cost of moving XMM,YMM,ZMM register.  */
> > > > >    6,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    /* VGATHERDPD is 23 uops and throughput is 9, VGATHERDPD is 35 uops,
> > > > >       throughput 12.  Approx 9 uops do not depend on vector size and every load
> > > > >       is 7 uops.  */
> > > > > @@ -1633,6 +1646,7 @@ struct processor_costs znver2_cost = {
> > > > >    2, 2, 3,                             /* cost of moving XMM,YMM,ZMM
> > > > >                                            register.  */
> > > > >    6,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    /* VGATHERDPD is 23 uops and throughput is 9, VGATHERDPD is 35 uops,
> > > > >       throughput 12.  Approx 9 uops do not depend on vector size and every load
> > > > >       is 7 uops.  */
> > > > > @@ -1765,6 +1779,7 @@ struct processor_costs znver3_cost = {
> > > > >    2, 2, 3,                             /* cost of moving XMM,YMM,ZMM
> > > > >                                            register.  */
> > > > >    6,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    /* VGATHERDPD is 15 uops and throughput is 4, VGATHERDPS is 23 uops,
> > > > >       throughput 9.  Approx 7 uops do not depend on vector size and every load
> > > > >       is 4 uops.  */
> > > > > @@ -1909,6 +1924,7 @@ struct processor_costs skylake_cost = {
> > > > >    {8, 8, 8, 8, 16},                    /* cost of unaligned stores.  */
> > > > >    2, 2, 4,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    6,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (2)+1,                 /* cost of moving integer to sse register.  */
> > > > >    20, 8,                               /* Gather load static, per_elt.  */
> > > > >    22, 10,                              /* Gather store static, per_elt.  */
> > > > >    64,                                  /* size of l1 cache.  */
> > > > > @@ -2035,6 +2051,7 @@ struct processor_costs icelake_cost = {
> > > > >    {8, 8, 8, 8, 16},                    /* cost of unaligned stores.  */
> > > > >    2, 2, 4,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    6,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    20, 8,                               /* Gather load static, per_elt.  */
> > > > >    22, 10,                              /* Gather store static, per_elt.  */
> > > > >    64,                                  /* size of l1 cache.  */
> > > > > @@ -2148,6 +2165,7 @@ const struct processor_costs btver1_cost = {
> > > > >    {10, 10, 12, 48, 96},                        /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    14,                                  /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    10, 10,                              /* Gather load static, per_elt.  */
> > > > >    10, 10,                              /* Gather store static, per_elt.  */
> > > > >    32,                                  /* size of l1 cache.  */
> > > > > @@ -2258,6 +2276,7 @@ const struct processor_costs btver2_cost = {
> > > > >    {10, 10, 12, 48, 96},                        /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    14,                                  /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    10, 10,                              /* Gather load static, per_elt.  */
> > > > >    10, 10,                              /* Gather store static, per_elt.  */
> > > > >    32,                                  /* size of l1 cache.  */
> > > > > @@ -2367,6 +2386,7 @@ struct processor_costs pentium4_cost = {
> > > > >    {32, 32, 32, 64, 128},               /* cost of unaligned stores.  */
> > > > >    12, 24, 48,                          /* cost of moving XMM,YMM,ZMM register */
> > > > >    20,                                  /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (2),                   /* cost of moving integer to sse register.  */
> > > > >    16, 16,                              /* Gather load static, per_elt.  */
> > > > >    16, 16,                              /* Gather store static, per_elt.  */
> > > > >    8,                                   /* size of l1 cache.  */
> > > > > @@ -2479,6 +2499,7 @@ struct processor_costs nocona_cost = {
> > > > >    {24, 24, 24, 48, 96},                        /* cost of unaligned stores.  */
> > > > >    6, 12, 24,                           /* cost of moving XMM,YMM,ZMM register */
> > > > >    20,                                  /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (2),                   /* cost of moving integer to sse register.  */
> > > > >    12, 12,                              /* Gather load static, per_elt.  */
> > > > >    12, 12,                              /* Gather store static, per_elt.  */
> > > > >    8,                                   /* size of l1 cache.  */
> > > > > @@ -2589,6 +2610,7 @@ struct processor_costs atom_cost = {
> > > > >    {16, 16, 16, 32, 64},                        /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    8,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    8, 8,                                        /* Gather load static, per_elt.  */
> > > > >    8, 8,                                        /* Gather store static, per_elt.  */
> > > > >    32,                                  /* size of l1 cache.  */
> > > > > @@ -2699,6 +2721,7 @@ struct processor_costs slm_cost = {
> > > > >    {16, 16, 16, 32, 64},                        /* cost of unaligned stores.  */
> > > > >    2, 4, 8,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    8,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    8, 8,                                        /* Gather load static, per_elt.  */
> > > > >    8, 8,                                        /* Gather store static, per_elt.  */
> > > > >    32,                                  /* size of l1 cache.  */
> > > > > @@ -2809,6 +2832,7 @@ struct processor_costs intel_cost = {
> > > > >    {10, 10, 10, 10, 10},                        /* cost of unaligned loads.  */
> > > > >    2, 2, 2,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    4,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    6, 6,                                        /* Gather load static, per_elt.  */
> > > > >    6, 6,                                        /* Gather store static, per_elt.  */
> > > > >    32,                                  /* size of l1 cache.  */
> > > > > @@ -2926,6 +2950,7 @@ struct processor_costs generic_cost = {
> > > > >    {6, 6, 6, 10, 15},                   /* cost of unaligned storess.  */
> > > > >    2, 3, 4,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    6,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    18, 6,                               /* Gather load static, per_elt.  */
> > > > >    18, 6,                               /* Gather store static, per_elt.  */
> > > > >    32,                                  /* size of l1 cache.  */
> > > > > @@ -3049,6 +3074,7 @@ struct processor_costs core_cost = {
> > > > >    {6, 6, 6, 6, 12},                    /* cost of unaligned stores.  */
> > > > >    2, 2, 4,                             /* cost of moving XMM,YMM,ZMM register */
> > > > >    2,                                   /* cost of moving SSE register to integer.  */
> > > > > +  COSTS_N_INSNS (1),                   /* cost of moving integer to sse register.  */
> > > > >    /* VGATHERDPD is 7 uops, rec throughput 5, while VGATHERDPD is 9 uops,
> > > > >       rec. throughput 6.
> > > > >       So 5 uops statically and one uops per load.  */
> > > > > diff --git a/gcc/testsuite/gcc.target/i386/pr99881.c b/gcc/testsuite/gcc.target/i386/pr99881.c
> > > > > new file mode 100644
> > > > > index 00000000000..7ae51c8310d
> > > > > --- /dev/null
> > > > > +++ b/gcc/testsuite/gcc.target/i386/pr99881.c
> > > > > @@ -0,0 +1,49 @@
> > > > > +/* PR target/99881.  */
> > > > > +/* { dg-do compile } */
> > > > > +/* { dg-options "-Ofast -march=skylake" } */
> > > > > +/* { dg-final { scan-assembler-not "xmm[0-9]" } } */
> > > > > +
> > > > > +void
> > > > > +foo (int* __restrict a, int n, int c)
> > > > > +{
> > > > > +    a[0] = n;
> > > > > +    a[1] = c;
> > > > > +}
> > > > > +
> > > > > +void
> > > > > +foo1 (int* __restrict a, int n, int b, int c, int d)
> > > > > +{
> > > > > +    a[0] = n;
> > > > > +    a[1] = b;
> > > > > +    a[2] = c;
> > > > > +    a[3] = d;
> > > > > +}
> > > > > +
> > > > > +void
> > > > > +foo2 (int* __restrict a, int n, int b, int c, int d, int e, int f, int g, int h)
> > > > > +{
> > > > > +    a[0] = n;
> > > > > +    a[1] = b;
> > > > > +    a[2] = c;
> > > > > +    a[3] = d;
> > > > > +    a[4] = e;
> > > > > +    a[5] = f;
> > > > > +    a[6] = g;
> > > > > +    a[7] = h;
> > > > > +}
> > > > > +
> > > > > +void
> > > > > +foo3 (long long* __restrict a, long long n, long long c)
> > > > > +{
> > > > > +    a[0] = n;
> > > > > +    a[1] = c;
> > > > > +}
> > > > > +
> > > > > +void
> > > > > +foo4 (long long* __restrict a, long long n, long long b, long long c, long long d)
> > > > > +{
> > > > > +    a[0] = n;
> > > > > +    a[1] = b;
> > > > > +    a[2] = c;
> > > > > +    a[3] = d;
> > > > > +}
> > > > > --
> > > > > 2.18.1
> > > > >
> > > >
> > > >
> > > > --
> > > > BR,
> > > > Hongtao
> > >
> > >
> > >
> > > --
> > > BR,
> > > Hongtao
> >
> >
> >
> > --
> > BR,
> > Hongtao


More information about the Gcc-patches mailing list