PR91166 - Unfolded ZIPs of constants

[Prathamesh Kulkarni]

On Fri, 19 Jul 2019 at 18:12, Richard Sandiford
<richard.sandiford@arm.com> wrote:
>
> Not really my area, but FWIW...
>
> Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org> writes:
> > Hi,
> > The attached patch tries to fix PR91166.
> > Does it look OK ?
> > Bootstrap+test in progress on aarch64-linux-gnu and x86_64-unknown-linux-gnu.
> >
> > Thanks,
> > Prathamesh
> >
> > 2019-07-17  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>
> >
> >       PR middle-end/91166
> >       * match.pd (vec_perm_expr(v, v, mask) -> v): New pattern.
> >       (define_predicates): Add entry for uniform_vector_p.
> >
> > testsuite/
> >       * gcc.target/aarch64/sve/pr91166.c: New test.
> >
> > diff --git a/gcc/match.pd b/gcc/match.pd
> > index 4a7aa0185d8..2ad98c28fd8 100644
> > --- a/gcc/match.pd
> > +++ b/gcc/match.pd
> > @@ -36,7 +36,8 @@ along with GCC; see the file COPYING3.  If not see
> >     integer_valued_real_p
> >     integer_pow2p
> >     uniform_integer_cst_p
> > -   HONOR_NANS)
> > +   HONOR_NANS
> > +   uniform_vector_p)
> >
> >  /* Operator lists.  */
> >  (define_operator_list tcc_comparison
> > @@ -5568,3 +5569,12 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
> >           { bitsize_int (at * tree_to_uhwi (TYPE_SIZE (TREE_TYPE (type)))); })
> >         (if (changed)
> >          (vec_perm { op0; } { op1; } { op2; }))))))))))
> > +
> > +/* VEC_PERM_EXPR (v, v, mask) -> v where v contains same element.  */
> > +(simplify
> > + (vec_perm (vec_duplicate@0 @1) @0 @2)
> > + { @0; })
> > +
> > +(simplify
> > + (vec_perm uniform_vector_p@0 @0 @1)
> > + { @0; })
>
> No need for the curly braces here, can use "@0" as the target of
> the simplification.
>
> It'd probably be worth using (match ...) to define a new predicate
> that handles (vec_duplicate ...), VECTOR_CST and CONSTRUCTOR,
> calling into uniform_vector_p for the latter two.
Hi,
Thanks for the suggestions.
Does this version look OK ?

Thanks,
Prathamesh

>
> Thanks,
> Richard
>
> > diff --git a/gcc/testsuite/gcc.target/aarch64/sve/pr91166.c b/gcc/testsuite/gcc.target/aarch64/sve/pr91166.c
> > new file mode 100644
> > index 00000000000..42654be3b31
> > --- /dev/null
> > +++ b/gcc/testsuite/gcc.target/aarch64/sve/pr91166.c
> > @@ -0,0 +1,20 @@
> > +/* { dg-do compile } */
> > +/* { dg-options "-O3 -march=armv8.2-a+sve -fdump-tree-optimized" } */
> > +
> > +void
> > +f1 (double x[][4])
> > +{
> > +  for (int i = 0; i < 4; ++i)
> > +    for (int j = 0; j < 4; ++j)
> > +      x[i][j] = 0;
> > +}
> > +
> > +void
> > +f2 (double x[][4], double y)
> > +{
> > +  for (int i = 0; i < 4; ++i)
> > +    for (int j = 0; j < 4; ++j)
> > +      x[i][j] = y;
> > +}
> > +
> > +/* { dg-final { scan-tree-dump-not "VEC_PERM_EXPR" "optimized"} } */
-------------- next part --------------
2019-07-23  Prathamesh Kulkarni  <prathamesh.kulkarni@linaro.org>

	PR middle-end/91166
	* match.pd (vec_perm_expr(v, v, mask) -> v): New pattern.
	(define_predicates): Add entry for uniform_vector_p.
	(vec_same_elem_p): New match pattern.

testsuite/
	* gcc.target/aarch64/sve/pr91166.c: New test.

diff --git a/gcc/match.pd b/gcc/match.pd
index 4a7aa0185d8..f14670a7982 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -36,7 +36,8 @@ along with GCC; see the file COPYING3.  If not see
    integer_valued_real_p
    integer_pow2p
    uniform_integer_cst_p
-   HONOR_NANS)
+   HONOR_NANS
+   uniform_vector_p)
 
 /* Operator lists.  */
 (define_operator_list tcc_comparison
@@ -5568,3 +5569,15 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
          { bitsize_int (at * tree_to_uhwi (TYPE_SIZE (TREE_TYPE (type)))); })
        (if (changed)
         (vec_perm { op0; } { op1; } { op2; }))))))))))
+
+/* VEC_PERM_EXPR (v, v, mask) -> v where v contains same element.  */
+
+(match (vec_same_elem_p @0)
+ uniform_vector_p@0)
+
+(match (vec_same_elem_p @0)
+ (vec_duplicate @0))
+
+(simplify
+ (vec_perm (vec_same_elem_p@0 @1) @0 @2)
+ @0)
diff --git a/gcc/testsuite/gcc.target/aarch64/sve/pr91166.c b/gcc/testsuite/gcc.target/aarch64/sve/pr91166.c
new file mode 100644
index 00000000000..42654be3b31
--- /dev/null
+++ b/gcc/testsuite/gcc.target/aarch64/sve/pr91166.c
@@ -0,0 +1,20 @@
+/* { dg-do compile } */
+/* { dg-options "-O3 -march=armv8.2-a+sve -fdump-tree-optimized" } */
+
+void
+f1 (double x[][4]) 
+{
+  for (int i = 0; i < 4; ++i)
+    for (int j = 0; j < 4; ++j)
+      x[i][j] = 0;
+}
+
+void
+f2 (double x[][4], double y)
+{
+  for (int i = 0; i < 4; ++i)
+    for (int j = 0; j < 4; ++j)
+      x[i][j] = y;
+}
+
+/* { dg-final { scan-tree-dump-not "VEC_PERM_EXPR" "optimized"} } */