re PR rtl-optimization/16104 (ICE in reload_cse_simplify_operands, at postreload.c:378 with SSE2 code on -O2)

PR rtl-optimization/16104
	* fold-const.c (fold_unary): Fix folding of vector conversions.

	* gcc.c-torture/execute/20050316-1.c: New test.

From-SVN: r97529

gcc/ChangeLog

@@ -1,3 +1,9 @@
+2005-04-04  Richard Henderson  <rth@redhat.com>
+	    Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/16104
+	* fold-const.c (fold_unary): Fix folding of vector conversions.
+
 2005-04-04  Richard Sandiford  <rsandifo@redhat.com>
 
 	* config.gcc (xstormy16-*-elf): Set extra_options.

gcc/fold-const.c

@@ -6772,16 +6772,19 @@ fold_unary (enum tree_code code, tree type, tree op0)
 	  int inside_int = INTEGRAL_TYPE_P (inside_type);
 	  int inside_ptr = POINTER_TYPE_P (inside_type);
 	  int inside_float = FLOAT_TYPE_P (inside_type);
+	  int inside_vec = TREE_CODE (inside_type) == VECTOR_TYPE;
 	  unsigned int inside_prec = TYPE_PRECISION (inside_type);
 	  int inside_unsignedp = TYPE_UNSIGNED (inside_type);
 	  int inter_int = INTEGRAL_TYPE_P (inter_type);
 	  int inter_ptr = POINTER_TYPE_P (inter_type);
 	  int inter_float = FLOAT_TYPE_P (inter_type);
+	  int inter_vec = TREE_CODE (inter_type) == VECTOR_TYPE;
 	  unsigned int inter_prec = TYPE_PRECISION (inter_type);
 	  int inter_unsignedp = TYPE_UNSIGNED (inter_type);
 	  int final_int = INTEGRAL_TYPE_P (type);
 	  int final_ptr = POINTER_TYPE_P (type);
 	  int final_float = FLOAT_TYPE_P (type);
+	  int final_vec = TREE_CODE (type) == VECTOR_TYPE;
 	  unsigned int final_prec = TYPE_PRECISION (type);
 	  int final_unsignedp = TYPE_UNSIGNED (type);
 
@@ -6801,12 +6804,15 @@ fold_unary (enum tree_code code, tree type, tree op0)
 	     since then we sometimes need the inner conversion.  Likewise if
 	     the outer has a precision not equal to the size of its mode.  */
 	  if ((((inter_int || inter_ptr) && (inside_int || inside_ptr))
-	       || (inter_float && inside_float))
+	       || (inter_float && inside_float)
+	       || (inter_vec && inside_vec))
 	      && inter_prec >= inside_prec
-	      && (inter_float || inter_unsignedp == inside_unsignedp)
+	      && (inter_float || inter_vec
+		  || inter_unsignedp == inside_unsignedp)
 	      && ! (final_prec != GET_MODE_BITSIZE (TYPE_MODE (type))
 		    && TYPE_MODE (type) == TYPE_MODE (inter_type))
-	      && ! final_ptr)
+	      && ! final_ptr
+	      && (! final_vec || inter_prec == inside_prec))
 	    return fold_build1 (code, type, TREE_OPERAND (op0, 0));
 
 	  /* If we have a sign-extension of a zero-extended value, we can
@@ -6818,6 +6824,7 @@ fold_unary (enum tree_code code, tree type, tree op0)
 
 	  /* Two conversions in a row are not needed unless:
 	     - some conversion is floating-point (overstrict for now), or
+	     - some conversion is a vector (overstrict for now), or
 	     - the intermediate type is narrower than both initial and
 	       final, or
 	     - the intermediate type and innermost type differ in signedness,
@@ -6827,6 +6834,7 @@ fold_unary (enum tree_code code, tree type, tree op0)
 	     - the final type is a pointer type and the precisions of the
 	       initial and intermediate types differ.  */
 	  if (! inside_float && ! inter_float && ! final_float
+	      && ! inside_vec && ! inter_vec && ! final_vec
 	      && (inter_prec > inside_prec || inter_prec > final_prec)
 	      && ! (inside_int && inter_int
 		    && inter_unsignedp != inside_unsignedp

gcc/testsuite/ChangeLog

@@ -1,3 +1,8 @@
+2005-04-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/16104
+	* gcc.c-torture/execute/20050316-1.c: New test.
+
 2005-04-04  Nathan Sidwell  <nathan@codesourcery.com>
 
 	* g++.dg/template/spec23.C: Fix dg-error text.

gcc/testsuite/gcc.c-torture/execute/20050316-1.c

@@ -0,0 +1,69 @@
+/* PR rtl-optimization/16104 */
+
+extern void abort (void);
+
+typedef int V2SI __attribute__ ((vector_size (8)));
+typedef unsigned int V2USI __attribute__ ((vector_size (8)));
+typedef short V2HI __attribute__ ((vector_size (4)));
+typedef unsigned int V2UHI __attribute__ ((vector_size (4)));
+
+int
+test1 (void)
+{
+  return (long long) (V2SI) 0LL;
+}
+
+int
+test2 (V2SI x)
+{
+  return (long long) x;
+}
+
+V2SI
+test3 (void)
+{
+  return (V2SI) (long long) (int) (V2HI) 0;
+}
+
+V2SI
+test4 (V2HI x)
+{
+  return (V2SI) (long long) (int) x;
+}
+
+V2SI
+test5 (V2USI x)
+{
+  return (V2SI) x;
+}
+
+int
+main (void)
+{
+  if (sizeof (short) != 2 || sizeof (int) != 4 || sizeof (long long) != 8)
+    return 0;
+
+  if (test1 () != 0)
+    abort ();
+
+  V2SI x = { 2, 2 };
+  if (test2 (x) != 2)
+    abort ();
+
+  union { V2SI x; int y[2]; V2USI z; long long l; } u;
+  u.x = test3 ();
+  if (u.y[0] != 0 || u.y[1] != 0)
+    abort ();
+
+  V2HI y = { 4, 4 };
+  union { V2SI x; long long y; } v;
+  v.x = test4 (y);
+  if (v.y != 0x40004)
+    abort ();
+
+  V2USI z = { 6, 6 };
+  u.x = test5 (z);
+  if (u.y[0] != 6 || u.y[1] != 6)
+    abort ();
+  return 0;
+}