re PR tree-optimization/49483 (unable to vectorize code equivalent to "scalbnf")

2011-06-21  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/49483
	* tree-vect-stmts.c (vectorizable_assignment): Also handle
	VIEW_CONVERT_EXPR conversions.

	* gcc.dg/vect/vect-120.c: New testcase.

From-SVN: r175252

gcc/ChangeLog

+2011-06-21  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/49483
+	* tree-vect-stmts.c (vectorizable_assignment): Also handle
+	VIEW_CONVERT_EXPR conversions.
+
 2011-06-21  Joseph Myers  <joseph@codesourcery.com>
 
 	* config/avr/avr-mcus.def, config/avr/genopt.sh: New files.

gcc/testsuite/ChangeLog

+2011-06-21  Richard Guenther  <rguenther@suse.de>
+
+	PR tree-optimization/49483
+	* gcc.dg/vect/vect-120.c: New testcase.
+
 2011-06-21  Ira Rosen  <ira.rosen@linaro.org>
 
 	PR testsuite/49443

gcc/testsuite/gcc.dg/vect/vect-120.c

+/* { dg-do compile } */
+/* { dg-require-effective-target vect_float } */
+/* { dg-require-effective-target vect_shift } */
+
+static inline float
+i2f(int x)
+{
+  union { float f; int i; } tmp;
+  tmp.i=x;
+  return tmp.f;
+}
+static inline float
+vect_ldexpf(float x, int n)
+{
+  n = (n+0x7f)<<23;
+  return x * i2f(n);
+}
+
+float __attribute__ ((aligned(16))) a[1024];
+float __attribute__ ((aligned(16))) b[1024];
+float __attribute__ ((aligned(16))) c[1024];
+
+void
+tV()
+{
+  int i;
+  for (i=0; i!=1024; ++i)
+    {
+      float z = a[i];
+      int n = b[i];
+      c[i] = vect_ldexpf(z,n);
+    }
+}
+
+/* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" } } */
+/* { dg-final { cleanup-tree-dump "vect" } } */

gcc/tree-vect-stmts.c

@@ -2089,6 +2089,9 @@ vectorizable_assignment (gimple stmt, gimple_stmt_iterator *gsi,
   else
     return false;
 
+  if (code == VIEW_CONVERT_EXPR)
+    op = TREE_OPERAND (op, 0);
+
   if (!vect_is_simple_use_1 (op, loop_vinfo, bb_vinfo,
 			     &def_stmt, &def, &dt[0], &vectype_in))
     {
@@ -2099,7 +2102,8 @@ vectorizable_assignment (gimple stmt, gimple_stmt_iterator *gsi,
 
   /* We can handle NOP_EXPR conversions that do not change the number
      of elements or the vector size.  */
-  if (CONVERT_EXPR_CODE_P (code)
+  if ((CONVERT_EXPR_CODE_P (code)
+       || code == VIEW_CONVERT_EXPR)
       && (!vectype_in
 	  || TYPE_VECTOR_SUBPARTS (vectype_in) != nunits
 	  || (GET_MODE_SIZE (TYPE_MODE (vectype))
@@ -2134,7 +2138,8 @@ vectorizable_assignment (gimple stmt, gimple_stmt_iterator *gsi,
       /* Arguments are ready. create the new vector stmt.  */
       FOR_EACH_VEC_ELT (tree, vec_oprnds, i, vop)
        {
-	 if (CONVERT_EXPR_CODE_P (code))
+	 if (CONVERT_EXPR_CODE_P (code)
+	     || code == VIEW_CONVERT_EXPR)
 	   vop = build1 (VIEW_CONVERT_EXPR, vectype, vop);
          new_stmt = gimple_build_assign (vec_dest, vop);
          new_temp = make_ssa_name (vec_dest, new_stmt);