rs6000: Allow conversions of MMA pointer types [PR106017]

GCC incorrectly disables conversions between MMA pointer types, which
are allowed with clang.  The original intent was to disable conversions
between MMA types and other other types, but pointer conversions should
have been allowed.  The fix is to just remove the MMA pointer conversion
handling code altogether.

gcc/
	PR target/106017
	* config/rs6000/rs6000.cc (rs6000_invalid_conversion): Remove handling
	of MMA pointer conversions.

gcc/testsuite/
	PR target/106017
	* gcc.target/powerpc/pr106017.c: New test.

2 files changed, 19 insertions, 22 deletions

diff --git a/gcc/config/rs6000/rs6000.cc b/gcc/config/rs6000/rs6000.cc
index df491be..2f3146e 100644
--- a/gcc/config/rs6000/rs6000.cc
+++ b/gcc/config/rs6000/rs6000.cc
@@ -28188,28 +28188,6 @@ rs6000_invalid_conversion (const_tree fromtype, const_tree totype)
       if (tomode == OOmode)
 	return N_("invalid conversion to type %<__vector_pair%>");
     }
-  else if (POINTER_TYPE_P (fromtype) && POINTER_TYPE_P (totype))
-    {
-      /* We really care about the modes of the base types.  */
-      frommode = TYPE_MODE (TREE_TYPE (fromtype));
-      tomode = TYPE_MODE (TREE_TYPE (totype));
-
-      /* Do not allow conversions to/from XOmode and OOmode pointer
-	 types, except to/from void pointers.  */
-      if (frommode != tomode
-	  && frommode != VOIDmode
-	  && tomode != VOIDmode)
-	{
-	  if (frommode == XOmode)
-	    return N_("invalid conversion from type %<__vector_quad *%>");
-	  if (tomode == XOmode)
-	    return N_("invalid conversion to type %<__vector_quad *%>");
-	  if (frommode == OOmode)
-	    return N_("invalid conversion from type %<__vector_pair *%>");
-	  if (tomode == OOmode)
-	    return N_("invalid conversion to type %<__vector_pair *%>");
-	}
-    }
 
   /* Conversion allowed.  */
   return NULL;
diff --git a/gcc/testsuite/gcc.target/powerpc/pr106017.c b/gcc/testsuite/gcc.target/powerpc/pr106017.c
new file mode 100644
index 0000000..46d6c7a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/powerpc/pr106017.c
@@ -0,0 +1,19 @@
+/* PR target/106017 */
+/* { dg-options "-O1 -mdejagnu-cpu=power10" } */
+/* { dg-require-effective-target power10_ok } */
+
+/* Make sure we do not flag any errors on the following test cases.  */
+
+void takeacc(__vector_quad *);
+void
+foo (void)
+{
+  __vector_quad arr[4];
+  takeacc (arr);
+}
+
+unsigned char *
+bar (__vector_quad *a)
+{
+  return (unsigned char *)a;
+}