Re: [PATCH] Check the type of mask while generating cond_op in gimple simplication.

[Hongtao Liu <crazylht@gmail.com>]

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On Mon, Sep 6, 2021 at 2:54 PM Richard Biener
<richard.guenther@gmail.com> wrote:
>
> On Thu, Sep 2, 2021 at 7:54 PM Richard Sandiford
> <richard.sandiford@arm.com> wrote:
> >
> > Hongtao Liu via Gcc-patches <gcc-patches@gcc.gnu.org> writes:
> > > On Wed, Sep 1, 2021 at 8:52 PM Richard Sandiford
> > > <richard.sandiford@arm.com> wrote:
> > >>
> > >> Richard Biener <richard.guenther@gmail.com> writes:
> > >> > On Wed, Sep 1, 2021 at 8:28 AM Hongtao Liu <crazylht@gmail.com> wrote:
> > >> >>
> > >> >> On Tue, Aug 31, 2021 at 7:56 PM Richard Biener
> > >> >> <richard.guenther@gmail.com> wrote:
> > >> >> >
> > >> >> > On Tue, Aug 31, 2021 at 12:18 PM Hongtao Liu <crazylht@gmail.com> wrote:
> > >> >> > >
> > >> >> > > On Mon, Aug 30, 2021 at 8:25 PM Richard Biener via Gcc-patches
> > >> >> > > <gcc-patches@gcc.gnu.org> wrote:
> > >> >> > > >
> > >> >> > > > On Fri, Aug 27, 2021 at 8:53 AM liuhongt <hongtao.liu@intel.com> wrote:
> > >> >> > > > >
> > >> >> > > > >   When gimple simplifcation try to combine op and vec_cond_expr to cond_op,
> > >> >> > > > > it doesn't check if mask type matches. It causes an ICE when expand cond_op
> > >> >> > > > > with mismatched mode.
> > >> >> > > > >   This patch add a function named cond_vectorized_internal_fn_supported_p
> > >> >> > > > >  to additionally check mask type than vectorized_internal_fn_supported_p.
> > >> >> > > > >
> > >> >> > > > >   Bootstrapped and regtested on x86_64-linux-gnu{-m32,}.
> > >> >> > > > >   Ok for trunk?
> > >> >> > > > >
> > >> >> > > > > gcc/ChangeLog:
> > >> >> > > > >
> > >> >> > > > >         PR middle-end/102080
> > >> >> > > > >         * internal-fn.c (cond_vectorized_internal_fn_supported_p): New functions.
> > >> >> > > > >         * internal-fn.h (cond_vectorized_internal_fn_supported_p): New declaration.
> > >> >> > > > >         * match.pd: Check the type of mask while generating cond_op in
> > >> >> > > > >         gimple simplication.
> > >> >> > > > >
> > >> >> > > > > gcc/testsuite/ChangeLog:
> > >> >> > > > >
> > >> >> > > > >         PR middle-end/102080
> > >> >> > > > >         * gcc.target/i386/pr102080.c: New test.
> > >> >> > > > > ---
> > >> >> > > > >  gcc/internal-fn.c                        | 22 ++++++++++++++++++++++
> > >> >> > > > >  gcc/internal-fn.h                        |  1 +
> > >> >> > > > >  gcc/match.pd                             | 24 ++++++++++++++++--------
> > >> >> > > > >  gcc/testsuite/gcc.target/i386/pr102080.c | 16 ++++++++++++++++
> > >> >> > > > >  4 files changed, 55 insertions(+), 8 deletions(-)
> > >> >> > > > >  create mode 100644 gcc/testsuite/gcc.target/i386/pr102080.c
> > >> >> > > > >
> > >> >> > > > > diff --git a/gcc/internal-fn.c b/gcc/internal-fn.c
> > >> >> > > > > index 1360a00f0b9..8b2b65db1a7 100644
> > >> >> > > > > --- a/gcc/internal-fn.c
> > >> >> > > > > +++ b/gcc/internal-fn.c
> > >> >> > > > > @@ -4102,6 +4102,28 @@ expand_internal_call (gcall *stmt)
> > >> >> > > > >    expand_internal_call (gimple_call_internal_fn (stmt), stmt);
> > >> >> > > > >  }
> > >> >> > > > >
> > >> >> > > > > +/* Check cond_op for vector modes since vectorized_internal_fn_supported_p
> > >> >> > > > > +   doesn't check if mask type matches.  */
> > >> >> > > > > +bool
> > >> >> > > > > +cond_vectorized_internal_fn_supported_p (internal_fn ifn, tree type,
> > >> >> > > > > +                                        tree mask_type)
> > >> >> > > > > +{
> > >> >> > > > > +  if (!vectorized_internal_fn_supported_p (ifn, type))
> > >> >> > > > > +    return false;
> > >> >> > > > > +
> > >> >> > > > > +  machine_mode mask_mode;
> > >> >> > > > > +  machine_mode vmode = TYPE_MODE (type);
> > >> >> > > > > +  int size1, size2;
> > >> >> > > > > +  if (VECTOR_MODE_P (vmode)
> > >> >> > > > > +      && targetm.vectorize.get_mask_mode (vmode).exists(&mask_mode)
> > >> >> > > > > +      && GET_MODE_SIZE (mask_mode).is_constant (&size1)
> > >> >> > > > > +      && GET_MODE_SIZE (TYPE_MODE (mask_type)).is_constant (&size2)
> > >> >> > > > > +      && size1 != size2)
> > >> >> > > >
> > >> >> > > > Why do we check for equal size rather than just mode equality which
> > >> >> > > I originally thought  TYPE_MODE of vector(8) <signed-boolean:1> was
> > >> >> > > not QImode, Changed the patch to check mode equality.
> > >> >> > > Update patch.
> > >> >> >
> > >> >> > Looking at all this it seems the match.pd patterns should have not
> > >> >> > used vectorized_internal_fn_supported_p but direct_internal_fn_supported_p
> > >> >> > which is equivalent here because we're always working with vector modes?
> > >>
> > >> Yeah, looks like it.
> > >>
> > >> >> > And then shouldn't we look at the actual optab whether the mask mode matches
> > >> >> > the expectation rather than going around via the target hook which may not have
> > >> >> > enough context to decide which mask mode to use?
> > >> >> How about this?
> > >> >>
> > >> >> +/* Return true if target supports cond_op with data TYPE and
> > >> >> +   mask MASK_TYPE.  */
> > >> >> +bool
> > >> >> +cond_internal_fn_supported_p (internal_fn ifn, tree type,
> > >> >> +       tree mask_type)
> > >> >> +{
> > >> >> +  tree_pair types = tree_pair (type, type);
> > >> >> +  optab tmp = direct_internal_fn_optab (ifn, types);
> > >> >> +  machine_mode vmode = TYPE_MODE (type);
> > >> >> +  insn_code icode = direct_optab_handler (tmp, vmode);
> > >> >> +  if (icode == CODE_FOR_nothing)
> > >> >> +    return false;
> > >> >> +
> > >> >> +  machine_mode mask_mode = TYPE_MODE (mask_type);
> > >> >> +  /* Can't create rtx and use insn_operand_matches here.  */
> > >> >> +  return insn_data[icode].operand[0].mode == vmode
> > >> >> +    && insn_data[icode].operand[1].mode == mask_mode;
> > >> >> +}
> > >> >> +
> > >> >
> > >> > Yeah, sth like that, though the operand[0].mode test should be
> > >> > redudnant.  I think we should assert or have a whiltelist
> > >> > for the internal function we support to be queried this way.
> > >> > Not sure if we can directly access the 'cond_binary/cond_ternary'
> > >> > classification used in internal-fn.def, that would be best.
> > >> >
> > >> > Richard, what are your thoughts about all this?
> > >>
> > >> IMO using get_mask_mode was right.  The optab documentation says:
> > >>
> > >>   Operands 0, 2, 3 and 4 all have mode @var{m}.  Operand 1 is a scalar
> > >>   integer if @var{m} is scalar, otherwise it has the mode returned by
> > >>   @code{TARGET_VECTORIZE_GET_MASK_MODE}.
> > >>
> > >> Allowing targets to use optabs to enforce different mask modes for
> > >> different operations would open up a mess of combinations.
> > >>
> > >> In other words, I think cond_vectorized_internal_fn_supported_p
> > >> is really testing two things:
> > >>
> > >> (1) is the mask type/vector type combination well-formed?
> > >> (2) is the internal function supported for the vector type?
> > >>
> > >> where (1) is a gimple question and (2) is a target question.
> > >>
> > >> I guess there's an argument that (1) should be part of the match.pd
> > >> condition instead, alongside the element_precision check.  That would
> > >> add to the cut-&-paste though. :-(
> > >>
> > >> Alternatively, I guess we would add:
> > >>
> > >>   bool is_truth_type_for (tree type, tree truth_type);
> > >>
> > >> to return true if truth_type is equal to truth_type_for (type)
> > >> (but without having to call truth_type_for).  We could then use:
> > >>
> > >>   is_truth_type_for (op_type, TREE_TYPE (@0))
> > >>
> > >> instead of:
> > >>
> > >>   element_precision (type) == element_precision (op_type)
> > >>
> > >> since it should be a strictly stronger condition.
> > > Thanks for your advice, it sounds more reasonable.
> > > Here is the updated patch.
> > >>
> > >> Thanks,
> > >> Richard
> > >
> > >
> > >
> > > --
> > > BR,
> > > Hongtao
> > >
> > > From ae192d4a164b8d73adb06d6e28864f717741158c Mon Sep 17 00:00:00 2001
> > > From: liuhongt <hongtao.liu@intel.com>
> > > Date: Thu, 2 Sep 2021 13:05:54 +0800
> > > Subject: [PATCH v4] Check mask type when doing cond_op related gimple
> > >  simplification.
> > >
> > > gcc/ChangeLog:
> > >
> > >       PR middle-end/102080
> > >       * match.pd: Check mask type when doing cond_op related gimple
> > >       simplification.
> > >       * tree.c (is_truth_type_for): New function.
> > >       * tree.h (is_truth_type_for): New declaration.
> > >
> > > gcc/testsuite/ChangeLog:
> > >
> > >       PR middle-end/102080
> > >       * gcc.target/i386/pr102080.c: New test.
> > > ---
> > >  gcc/match.pd                             |  8 ++++----
> > >  gcc/testsuite/gcc.target/i386/pr102080.c | 19 +++++++++++++++++++
> > >  gcc/tree.c                               |  7 +++++++
> > >  gcc/tree.h                               |  1 +
> > >  4 files changed, 31 insertions(+), 4 deletions(-)
> > >  create mode 100644 gcc/testsuite/gcc.target/i386/pr102080.c
> > >
> > > diff --git a/gcc/match.pd b/gcc/match.pd
> > > index f421c74b62c..c9a27f46ed2 100644
> > > --- a/gcc/match.pd
> > > +++ b/gcc/match.pd
> > > @@ -6988,13 +6988,13 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
> > >    (vec_cond @0 (view_convert? (uncond_op@4 @1 @2)) @3)
> > >    (with { tree op_type = TREE_TYPE (@4); }
> > >     (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
> > > -     && element_precision (type) == element_precision (op_type))
> > > +     && is_truth_type_for (type, TREE_TYPE (@0)))
> >
> > Why pass “type” rather than “op_type”?  “type” is the type of the
Sorry for the typo, changed.
> > original expression, and if the original vec_cond is well-formed,
> > @0 should already have the right truth type for “type”.  Here we're
> > trying to convert the expression into a conditional operation on
> > “op_type”, so we need to test whether that's valid.
> >
> > >      (view_convert (cond_op @0 @1 @2 (view_convert:op_type @3))))))
> > >   (simplify
> > >    (vec_cond @0 @1 (view_convert? (uncond_op@4 @2 @3)))
> > >    (with { tree op_type = TREE_TYPE (@4); }
> > >     (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
> > > -     && element_precision (type) == element_precision (op_type))
> > > +     && is_truth_type_for (type, TREE_TYPE (@0)))
> > >      (view_convert (cond_op (bit_not @0) @2 @3 (view_convert:op_type @1)))))))
> > >
> > >  /* Same for ternary operations.  */
> > > @@ -7004,13 +7004,13 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
> > >    (vec_cond @0 (view_convert? (uncond_op@5 @1 @2 @3)) @4)
> > >    (with { tree op_type = TREE_TYPE (@5); }
> > >     (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
> > > -     && element_precision (type) == element_precision (op_type))
> > > +     && is_truth_type_for (type, TREE_TYPE (@0)))
> > >      (view_convert (cond_op @0 @1 @2 @3 (view_convert:op_type @4))))))
> > >   (simplify
> > >    (vec_cond @0 @1 (view_convert? (uncond_op@5 @2 @3 @4)))
> > >    (with { tree op_type = TREE_TYPE (@5); }
> > >     (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
> > > -     && element_precision (type) == element_precision (op_type))
> > > +     && is_truth_type_for (type, TREE_TYPE (@0)))
> > >      (view_convert (cond_op (bit_not @0) @2 @3 @4
> > >                 (view_convert:op_type @1)))))))
> > >  #endif
> > > diff --git a/gcc/testsuite/gcc.target/i386/pr102080.c b/gcc/testsuite/gcc.target/i386/pr102080.c
> > > new file mode 100644
> > > index 00000000000..4c5ee32ee63
> > > --- /dev/null
> > > +++ b/gcc/testsuite/gcc.target/i386/pr102080.c
> > > @@ -0,0 +1,19 @@
> > > +/* { dg-do compile } */
> > > +/* { dg-options "-O2" } */
> > > +
> > > +#include<immintrin.h>
> > > +typedef float __m256 __attribute__((__vector_size__(32)));
> > > +__m256 _mm256_blendv_ps___Y, _mm256_blendv_ps___M, _mm256_mul_ps___A,
> > > +  _mm256_mul_ps___B, IfThenElse___trans_tmp_9;
> > > +
> > > +void
> > > +__attribute__ ((target("avx")))
> > > +IfThenElse (__m256 no) {
> > > +  IfThenElse___trans_tmp_9 = _mm256_blendv_ps (no, _mm256_blendv_ps___Y, _mm256_blendv_ps___M);
> > > +}
> > > +void
> > > +__attribute__ ((target("avx512vl")))
> > > +EncodedFromDisplay() {
> > > +  __m256 __trans_tmp_11 = _mm256_mul_ps___A * _mm256_mul_ps___B;
> > > +  IfThenElse(__trans_tmp_11);
> > > +}
> > > diff --git a/gcc/tree.c b/gcc/tree.c
> > > index cba3bca41b3..88c2221eabb 100644
> > > --- a/gcc/tree.c
> > > +++ b/gcc/tree.c
> > > @@ -10723,6 +10723,13 @@ signed_type_for (tree type)
> > >    return signed_or_unsigned_type_for (0, type);
> > >  }
> > >
> > > +bool
> > > +is_truth_type_for (tree type, tree truth_type)
> > > +{
> > > +  tree tmp = truth_type_for (type);
> > > +  return tmp == truth_type;
> > > +}
> >
> > The idea was to try to avoid calling truth_type to create a type.
> > Instead we can use similar logic to truth_type to tell whether type
> > has the right form.  I think the rules are:
> >
> > - For VECTOR_TYPEs:
> >   - The truth type must be a VECTOR_BOOLEAN_TYPE.
> >   - The number of elements must match (known_eq).
> >   - Also:
> >     - If !VECTOR_BOOLEAN_TYPE_P and targetm.vectorize.get_mask_mode
> >       exists, the truth type must have that mode.
> >     - Otherwise, the types must have the same size.
>
> For vector types it's
>
>   VECTOR_BOOLEAN_TYPE_P (truth_type)
>   && known_eq (number of elements)
>   && targetm.vectorize.get_mask_mode (TYPE_MODE (type)) == TYPE_MODE
> (truth_type)
>
> I think we're only interested in the case that TYPE_MODE (type) is a
> vector mode given
> we're doing optab checks.  If we want to cover !VECTOR_MODE vector type 'type'
> then it would be known_eq (component sizes) I think.
>
> Not sure if we need to test for !TYPE_UNSIGNED (truth_type).
>
> > - Otherwise, the truth type must be a BOOLEAN_TYPE.
>
> I'm not sure which case you're refering to here - when 'type' is a scalar type?
> I suppose we'd want to allow all types that trivially convert to
> boolean_type_node
Update patch.
> then which means useless_type_conversion_p (boolean_type_node, truth_type).
>
> > (Richi please correct me if I'm wrong.)
> >
> > Thanks,
> > Richard
> >
> >
> > > +
> > >  /* If TYPE is a vector type, return a signed integer vector type with the
> > >     same width and number of subparts. Otherwise return boolean_type_node.  */
> > >
> > > diff --git a/gcc/tree.h b/gcc/tree.h
> > > index 060a41f6991..c8542bfd476 100644
> > > --- a/gcc/tree.h
> > > +++ b/gcc/tree.h
> > > @@ -4556,6 +4556,7 @@ extern tree build_string_literal (unsigned, const char * = NULL,
> > >  extern tree signed_or_unsigned_type_for (int, tree);
> > >  extern tree signed_type_for (tree);
> > >  extern tree unsigned_type_for (tree);
> > > +bool is_truth_type_for (tree, tree);
> > >  extern tree truth_type_for (tree);
> > >  extern tree build_pointer_type_for_mode (tree, machine_mode, bool);
> > >  extern tree build_pointer_type (tree);



-- 
BR,
Hongtao

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From 5015f89a085eeaba2e2304a37794dafdc0c455be Mon Sep 17 00:00:00 2001
From: liuhongt <hongtao.liu@intel.com>
Date: Thu, 2 Sep 2021 13:05:54 +0800
Subject: [PATCH v5] Check mask type when doing cond_op related gimple
 simplification.

gcc/ChangeLog:

	PR middle-end/102080
	* match.pd: Check mask type when doing cond_op related gimple
	simplification.
	* tree.c (is_truth_type_for): New function.
	* tree.h (is_truth_type_for): New declaration.

gcc/testsuite/ChangeLog:

	PR middle-end/102080
	* gcc.target/i386/pr102080.c: New test.
---
 gcc/match.pd                             |  8 +++----
 gcc/testsuite/gcc.target/i386/pr102080.c | 19 ++++++++++++++++
 gcc/tree.c                               | 29 ++++++++++++++++++++++++
 gcc/tree.h                               |  1 +
 4 files changed, 53 insertions(+), 4 deletions(-)
 create mode 100644 gcc/testsuite/gcc.target/i386/pr102080.c

diff --git a/gcc/match.pd b/gcc/match.pd
index f920bc4b7c1..f76b4a7b793 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -7003,13 +7003,13 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
   (vec_cond @0 (view_convert? (uncond_op@4 @1 @2)) @3)
   (with { tree op_type = TREE_TYPE (@4); }
    (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
-	&& element_precision (type) == element_precision (op_type))
+	&& is_truth_type_for (op_type, TREE_TYPE (@0)))
     (view_convert (cond_op @0 @1 @2 (view_convert:op_type @3))))))
  (simplify
   (vec_cond @0 @1 (view_convert? (uncond_op@4 @2 @3)))
   (with { tree op_type = TREE_TYPE (@4); }
    (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
-	&& element_precision (type) == element_precision (op_type))
+	&& is_truth_type_for (op_type, TREE_TYPE (@0)))
     (view_convert (cond_op (bit_not @0) @2 @3 (view_convert:op_type @1)))))))
 
 /* Same for ternary operations.  */
@@ -7019,13 +7019,13 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
   (vec_cond @0 (view_convert? (uncond_op@5 @1 @2 @3)) @4)
   (with { tree op_type = TREE_TYPE (@5); }
    (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
-	&& element_precision (type) == element_precision (op_type))
+	&& is_truth_type_for (op_type, TREE_TYPE (@0)))
     (view_convert (cond_op @0 @1 @2 @3 (view_convert:op_type @4))))))
  (simplify
   (vec_cond @0 @1 (view_convert? (uncond_op@5 @2 @3 @4)))
   (with { tree op_type = TREE_TYPE (@5); }
    (if (vectorized_internal_fn_supported_p (as_internal_fn (cond_op), op_type)
-	&& element_precision (type) == element_precision (op_type))
+	&& is_truth_type_for (op_type, TREE_TYPE (@0)))
     (view_convert (cond_op (bit_not @0) @2 @3 @4
 		  (view_convert:op_type @1)))))))
 #endif
diff --git a/gcc/testsuite/gcc.target/i386/pr102080.c b/gcc/testsuite/gcc.target/i386/pr102080.c
new file mode 100644
index 00000000000..4c5ee32ee63
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr102080.c
@@ -0,0 +1,19 @@
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+#include<immintrin.h>
+typedef float __m256 __attribute__((__vector_size__(32)));
+__m256 _mm256_blendv_ps___Y, _mm256_blendv_ps___M, _mm256_mul_ps___A,
+  _mm256_mul_ps___B, IfThenElse___trans_tmp_9;
+
+void
+__attribute__ ((target("avx")))
+IfThenElse (__m256 no) {
+  IfThenElse___trans_tmp_9 = _mm256_blendv_ps (no, _mm256_blendv_ps___Y, _mm256_blendv_ps___M);
+}
+void
+__attribute__ ((target("avx512vl")))
+EncodedFromDisplay() {
+  __m256 __trans_tmp_11 = _mm256_mul_ps___A * _mm256_mul_ps___B;
+  IfThenElse(__trans_tmp_11);
+}
diff --git a/gcc/tree.c b/gcc/tree.c
index a89d50a30ad..5aa5413fcb9 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -10723,6 +10723,35 @@ signed_type_for (tree type)
   return signed_or_unsigned_type_for (0, type);
 }
 
+/* - For VECTOR_TYPEs:
+    - The truth type must be a VECTOR_BOOLEAN_TYPE.
+    - The number of elements must match (known_eq).
+    - targetm.vectorize.get_mask_mode exists, and exactly
+      the same mode as the truth type.
+   - Otherwise, the truth type must be a BOOLEAN_TYPE
+     or useless_type_conversion_p to BOOLEAN_TYPE.  */
+bool
+is_truth_type_for (tree type, tree truth_type)
+{
+  machine_mode mask_mode = TYPE_MODE (truth_type);
+  machine_mode vmode = TYPE_MODE (type);
+  machine_mode tmask_mode;
+
+  if (TREE_CODE (type) == VECTOR_TYPE)
+    {
+      if (VECTOR_BOOLEAN_TYPE_P (truth_type)
+	  && known_eq (TYPE_VECTOR_SUBPARTS (type),
+		       TYPE_VECTOR_SUBPARTS (truth_type))
+	  && targetm.vectorize.get_mask_mode (vmode).exists (&tmask_mode)
+	  && tmask_mode == mask_mode)
+	return true;
+
+      return false;
+    }
+
+  return useless_type_conversion_p (boolean_type_node, truth_type);
+}
+
 /* If TYPE is a vector type, return a signed integer vector type with the
    same width and number of subparts. Otherwise return boolean_type_node.  */
 
diff --git a/gcc/tree.h b/gcc/tree.h
index 1559fe060a0..828025b5583 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -4583,6 +4583,7 @@ extern tree build_string_literal (unsigned, const char * = NULL,
 extern tree signed_or_unsigned_type_for (int, tree);
 extern tree signed_type_for (tree);
 extern tree unsigned_type_for (tree);
+bool is_truth_type_for (tree, tree);
 extern tree truth_type_for (tree);
 extern tree build_pointer_type_for_mode (tree, machine_mode, bool);
 extern tree build_pointer_type (tree);
-- 
2.27.0