re PR middle-end/42196 (ICE when SRAing partial assigments to complex number)

2009-11-30  Martin Jambor  <mjambor@suse.cz>

	PR middle-end/42196
	* tree-sra.c (struct access): New field grp_different_types.
	(dump_access): Dump grp_different_types.
	(compare_access_positions): Prefer scalars and vectors over other
	scalar types.
	(sort_and_splice_var_accesses): Set grp_different_types if appropriate.
	(sra_modify_expr): Use the original also when dealing with a complex
	 or vector group accessed as multiple types.

	* testsuite/gcc.c-torture/compile/pr42196-1.c: New test.
	* testsuite/gcc.c-torture/compile/pr42196-2.c: New test.
	* testsuite/gcc.c-torture/compile/pr42196-3.c: New test.

From-SVN: r154834

gcc/ChangeLog

+2009-11-30  Martin Jambor  <mjambor@suse.cz>
+
+	PR middle-end/42196
+	* tree-sra.c (struct access): New field grp_different_types.
+	(dump_access): Dump grp_different_types.
+	(compare_access_positions): Prefer scalars and vectors over other
+	scalar types.
+	(sort_and_splice_var_accesses): Set grp_different_types if appropriate.
+	(sra_modify_expr): Use the original also when dealing with a complex
+	 or vector group accessed as multiple types.
+
 2009-11-30  Richard Henderson  <rth@redhat.com>
 
 	* config/i386/i386.c (avx_vperm2f128_parallel): New.

gcc/testsuite/ChangeLog

+2009-11-30  Martin Jambor  <mjambor@suse.cz>
+
+	PR middle-end/42196
+	* gcc.c-torture/compile/pr42196-1.c: New test.
+	* gcc.c-torture/compile/pr42196-2.c: New test.
+	* gcc.c-torture/compile/pr42196-3.c: New test.
+
 2009-11-30  Ira Rosen  <irar@il.ibm.com>
 
 	* gfortran.dg/vect/vect-7.f90: New test.

gcc/testsuite/gcc.c-torture/compile/pr42196-1.c

+union U
+{
+  double d;
+  __complex__ int c;
+};
+
+double gd;
+extern double bar (union U);
+
+double foo (int b, double d, int c1, int c2)
+{
+  union U u;
+  double r;
+
+  if (b)
+    {
+      u.d = d;
+      r = u.d;
+    }
+  else
+    {
+      __real__ u.c = c1;
+      __imag__ u.c = c2;
+      r = bar (u);
+    }
+
+  return r;
+}

gcc/testsuite/gcc.c-torture/compile/pr42196-2.c

+union U
+{
+  __complex__ int ci;
+  __complex__ float cf;
+};
+
+float gd;
+extern float bar (union U);
+
+float foo (int b, double f1, double f2, int c1, int c2)
+{
+  union U u;
+  double r;
+
+  if (b)
+    {
+      __real__ u.cf = f1;
+      __imag__ u.cf = f2;
+    }
+  else
+    {
+      __real__ u.ci = c1;
+      __imag__ u.ci = c2;
+    }
+
+  r = bar (u);
+  return r;
+}

gcc/testsuite/gcc.c-torture/compile/pr42196-3.c

+union U
+{
+  __complex__ int ci;
+  __complex__ float cf;
+};
+
+float gd;
+extern float bar (float, float);
+
+float foo (int b, union U u)
+{
+  float f1, f2, r;
+
+  if (b)
+    {
+      f1 = __real__ u.cf;
+      f1 = __imag__ u.cf;
+    }
+  else
+    {
+      f1 = __real__ u.ci;
+      f1 = __imag__ u.ci;
+    }
+
+  r = bar (f1, f2);
+  return r;
+}

gcc/tree-sra.c

@@ -199,6 +199,10 @@ struct access
      BIT_FIELD_REF?  */
   unsigned grp_partial_lhs : 1;
 
+  /* Does this group contain accesses to different types? (I.e. through a union
+     or a similar mechanism).  */
+  unsigned grp_different_types : 1;
+
   /* Set when a scalar replacement should be created for this variable.  We do
      the decision and creation at different places because create_tmp_var
      cannot be called from within FOR_EACH_REFERENCED_VAR. */
@@ -339,12 +343,14 @@ dump_access (FILE *f, struct access *access, bool grp)
     fprintf (f, ", grp_write = %d, grp_read = %d, grp_hint = %d, "
 	     "grp_covered = %d, grp_unscalarizable_region = %d, "
 	     "grp_unscalarized_data = %d, grp_partial_lhs = %d, "
-	     "grp_to_be_replaced = %d\n grp_maybe_modified = %d, "
+	     "grp_different_types = %d, grp_to_be_replaced = %d, "
+	     "grp_maybe_modified = %d, "
 	     "grp_not_necessarilly_dereferenced = %d\n",
 	     access->grp_write, access->grp_read, access->grp_hint,
 	     access->grp_covered, access->grp_unscalarizable_region,
 	     access->grp_unscalarized_data, access->grp_partial_lhs,
-	     access->grp_to_be_replaced, access->grp_maybe_modified,
+	     access->grp_different_types, access->grp_to_be_replaced,
+	     access->grp_maybe_modified,
 	     access->grp_not_necessarilly_dereferenced);
   else
     fprintf (f, ", write = %d, grp_partial_lhs = %d\n", access->write,
@@ -1117,6 +1123,17 @@ compare_access_positions (const void *a, const void *b)
       else if (is_gimple_reg_type (f1->type)
 	       && !is_gimple_reg_type (f2->type))
 	return -1;
+      /* Put any complex or vector type before any other scalar type.  */
+      else if (TREE_CODE (f1->type) != COMPLEX_TYPE
+	       && TREE_CODE (f1->type) != VECTOR_TYPE
+	       && (TREE_CODE (f2->type) == COMPLEX_TYPE
+		   || TREE_CODE (f2->type) == VECTOR_TYPE))
+	return 1;
+      else if ((TREE_CODE (f1->type) == COMPLEX_TYPE
+		|| TREE_CODE (f1->type) == VECTOR_TYPE)
+	       && TREE_CODE (f2->type) != COMPLEX_TYPE
+	       && TREE_CODE (f2->type) != VECTOR_TYPE)
+	return -1;
       /* Put the integral type with the bigger precision first.  */
       else if (INTEGRAL_TYPE_P (f1->type)
 	       && INTEGRAL_TYPE_P (f2->type))
@@ -1417,6 +1434,7 @@ sort_and_splice_var_accesses (tree var)
       bool grp_read = !access->write;
       bool multiple_reads = false;
       bool grp_partial_lhs = access->grp_partial_lhs;
+      bool grp_different_types = false;
       bool first_scalar = is_gimple_reg_type (access->type);
       bool unscalarizable_region = access->grp_unscalarizable_region;
 
@@ -1448,6 +1466,7 @@ sort_and_splice_var_accesses (tree var)
 		grp_read = true;
 	    }
 	  grp_partial_lhs |= ac2->grp_partial_lhs;
+	  grp_different_types |= !types_compatible_p (access->type, ac2->type);
 	  unscalarizable_region |= ac2->grp_unscalarizable_region;
 	  relink_to_new_repr (access, ac2);
 
@@ -1466,6 +1485,7 @@ sort_and_splice_var_accesses (tree var)
       access->grp_read = grp_read;
       access->grp_hint = multiple_reads;
       access->grp_partial_lhs = grp_partial_lhs;
+      access->grp_different_types = grp_different_types;
       access->grp_unscalarizable_region = unscalarizable_region;
       if (access->first_link)
 	add_access_to_work_queue (access);
@@ -2112,8 +2132,15 @@ sra_modify_expr (tree *expr, gimple_stmt_iterator *gsi, bool write,
          access expression to extract the scalar component afterwards.
 	 This happens if scalarizing a function return value or parameter
 	 like in gcc.c-torture/execute/20041124-1.c, 20050316-1.c and
-	 gcc.c-torture/compile/20011217-1.c.  */
-      if (!is_gimple_reg_type (type))
+	 gcc.c-torture/compile/20011217-1.c.
+
+         We also want to use this when accessing a complex or vector which can
+         be accessed as a different type too, potentially creating a need for
+         type conversion  (see PR42196).  */
+      if (!is_gimple_reg_type (type)
+	  || (access->grp_different_types
+	      && (TREE_CODE (type) == COMPLEX_TYPE
+		  || TREE_CODE (type) == VECTOR_TYPE)))
 	{
 	  tree ref = access->base;
 	  bool ok;