On Tue, Jun 20, 2023 at 4:41 PM Richard Biener
<richard.guent...@gmail.com> wrote:
>
> On Fri, Jun 2, 2023 at 3:01 AM liuhongt via Gcc-patches
> <gcc-patches@gcc.gnu.org> wrote:
> >
> > We have already use intermidate type in case WIDEN, but not for NONE,
> > this patch extended that.
> >
> > I didn't do that in pattern recog since we need to know whether the
> > stmt belongs to any slp_node to decide the vectype, the related optabs
> > are checked according to vectype_in and vectype_out. For non-slp case,
> > vec_pack/unpack are always used when lhs has different size from rhs,
> > for slp case, sometimes vec_pack/unpack is used, somethings
> > direct conversion is used.
> >
> > Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
> > Ok for trunk?
> >
> > gcc/ChangeLog:
> >
> > PR target/110018
> > * tree-vect-stmts.cc (vectorizable_conversion): Use
> > intermiediate integer type for float_expr/fix_trunc_expr when
> > direct optab is not existed.
> >
> > gcc/testsuite/ChangeLog:
> >
> > * gcc.target/i386/pr110018-1.c: New test.
> > ---
> > gcc/testsuite/gcc.target/i386/pr110018-1.c | 94 ++++++++++++++++++++++
> > gcc/tree-vect-stmts.cc | 56 ++++++++++++-
> > 2 files changed, 149 insertions(+), 1 deletion(-)
> > create mode 100644 gcc/testsuite/gcc.target/i386/pr110018-1.c
> >
> > diff --git a/gcc/testsuite/gcc.target/i386/pr110018-1.c
> > b/gcc/testsuite/gcc.target/i386/pr110018-1.c
> > new file mode 100644
> > index 00000000000..b1baffd7af1
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/i386/pr110018-1.c
> > @@ -0,0 +1,94 @@
> > +/* { dg-do compile } */
> > +/* { dg-options "-mavx512fp16 -mavx512vl -O2 -mavx512dq" } */
> > +/* { dg-final { scan-assembler-times {(?n)vcvttp[dsh]2[dqw]} 5 } } */
> > +/* { dg-final { scan-assembler-times {(?n)vcvt[dqw]*2p[dsh]} 5 } } */
> > +
> > +void
> > +foo (double* __restrict a, char* b)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > +}
> > +
> > +void
> > +foo1 (float* __restrict a, char* b)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > + a[2] = b[2];
> > + a[3] = b[3];
> > +}
> > +
> > +void
> > +foo2 (_Float16* __restrict a, char* b)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > + a[2] = b[2];
> > + a[3] = b[3];
> > + a[4] = b[4];
> > + a[5] = b[5];
> > + a[6] = b[6];
> > + a[7] = b[7];
> > +}
> > +
> > +void
> > +foo3 (double* __restrict a, short* b)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > +}
> > +
> > +void
> > +foo4 (float* __restrict a, char* b)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > + a[2] = b[2];
> > + a[3] = b[3];
> > +}
> > +
> > +void
> > +foo5 (double* __restrict b, char* a)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > +}
> > +
> > +void
> > +foo6 (float* __restrict b, char* a)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > + a[2] = b[2];
> > + a[3] = b[3];
> > +}
> > +
> > +void
> > +foo7 (_Float16* __restrict b, char* a)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > + a[2] = b[2];
> > + a[3] = b[3];
> > + a[4] = b[4];
> > + a[5] = b[5];
> > + a[6] = b[6];
> > + a[7] = b[7];
> > +}
> > +
> > +void
> > +foo8 (double* __restrict b, short* a)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > +}
> > +
> > +void
> > +foo9 (float* __restrict b, char* a)
> > +{
> > + a[0] = b[0];
> > + a[1] = b[1];
> > + a[2] = b[2];
> > + a[3] = b[3];
> > +}
> > diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
> > index bd3b07a3aa1..1118c89686d 100644
> > --- a/gcc/tree-vect-stmts.cc
> > +++ b/gcc/tree-vect-stmts.cc
> > @@ -5162,6 +5162,49 @@ vectorizable_conversion (vec_info *vinfo,
> > return false;
> > if (supportable_convert_operation (code, vectype_out, vectype_in,
> > &code1))
> > break;
>
> A comment would be nice here. Like
>
> /* For conversions between float and smaller integer types try whether we
> can
> use intermediate signed integer types to support the conversion. */
>
> > + if ((code == FLOAT_EXPR
> > + && GET_MODE_SIZE (lhs_mode) > GET_MODE_SIZE (rhs_mode))
> > + || (code == FIX_TRUNC_EXPR
> > + && GET_MODE_SIZE (rhs_mode) > GET_MODE_SIZE (lhs_mode)))
> > + {
> > + bool float_expr_p = code == FLOAT_EXPR;
> > + scalar_mode imode = float_expr_p ? rhs_mode : lhs_mode;
> > + fltsz = GET_MODE_SIZE (float_expr_p ? lhs_mode : rhs_mode);
> > + code1 = float_expr_p ? code : NOP_EXPR;
> > + codecvt1 = float_expr_p ? NOP_EXPR : code;
> > + FOR_EACH_2XWIDER_MODE (rhs_mode_iter, imode)
> > + {
> > + imode = rhs_mode_iter.require ();
> > + if (GET_MODE_SIZE (imode) > fltsz)
> > + break;
> > +
> > + cvt_type
> > + = build_nonstandard_integer_type (GET_MODE_BITSIZE (imode),
> > + 0);
> > + cvt_type = get_vectype_for_scalar_type (vinfo, cvt_type,
> > + slp_node);
> > + /* This should only happened for SLP as long as loop
> > vectorizer
> > + only supports same-sized vector. */
> > + if (cvt_type == NULL_TREE
> > + || maybe_ne (TYPE_VECTOR_SUBPARTS (cvt_type), nunits_in)
> > + || !supportable_convert_operation (code1, vectype_out,
> > + cvt_type, &code1)
> > + || !supportable_convert_operation (codecvt1, cvt_type,
> > + vectype_in, &codecvt1))
> > + continue;
> > +
> > + found_mode = true;
> > + break;
> > + }
> > +
> > + if (found_mode)
> > + {
> > + multi_step_cvt++;
> > + interm_types.safe_push (cvt_type);
> > + cvt_type = NULL_TREE;
> > + break;
> > + }
> > + }
> > /* FALLTHRU */
> > unsupported:
> > if (dump_enabled_p ())
> > @@ -5381,7 +5424,18 @@ vectorizable_conversion (vec_info *vinfo,
> > {
> > /* Arguments are ready, create the new vector stmt. */
> > gcc_assert (TREE_CODE_LENGTH (code1) == unary_op);
> > - gassign *new_stmt = gimple_build_assign (vec_dest, code1, vop0);
> > + gassign* new_stmt;
> > + if (multi_step_cvt)
> > + {
> > + gcc_assert (multi_step_cvt == 1);
> > + new_stmt = gimple_build_assign (vec_dest, codecvt1, vop0);
> > + new_temp = make_ssa_name (vec_dest, new_stmt);
>
> I wonder how you get away with using vec_dest both for the final and the
> intermediate conversion and not involve interm_types[0]?
interm_types[0] is assigned to vect_dest, the original
vect_dest(vectype_out) is pushed to vec_dsts.
auto_vec<tree> vec_dsts (multi_step_cvt + 1);
vec_dest = vect_create_destination_var (scalar_dest,
(cvt_type && modifier == WIDEN)
? cvt_type : vectype_out);
vec_dsts.quick_push (vec_dest);
if (multi_step_cvt)
{
for (i = interm_types.length () - 1;
interm_types.iterate (i, &intermediate_type); i--)
{
vec_dest = vect_create_destination_var (scalar_dest,
intermediate_type);
vec_dsts.quick_push (vec_dest);
}
}
>
> Otherwise looks good.
Thanks for review.
>
> Thanks,
> Richard.
>
> > + gimple_assign_set_lhs (new_stmt, new_temp);
> > + vect_finish_stmt_generation (vinfo, stmt_info, new_stmt, gsi);
> > + vop0 = new_temp;
> > + vec_dest = vec_dsts[0];
And it's assigned back to vec_dest here.
> > + }
> > + new_stmt = gimple_build_assign (vec_dest, code1, vop0);
> > new_temp = make_ssa_name (vec_dest, new_stmt);
> > gimple_assign_set_lhs (new_stmt, new_temp);
> > vect_finish_stmt_generation (vinfo, stmt_info, new_stmt, gsi);
> > --
> > 2.39.1.388.g2fc9e9ca3c
> >
--
BR,
Hongtao
