re PR rtl-optimization/57915 (ICE in set_address_disp, at rtlanal.c:5537)

	PR rtl-optimization/57915
	* recog.c (simplify_while_replacing): If all unary/binary/relational
	operation arguments are constant, attempt to simplify those.

	* gcc.target/i386/pr57915.c: New test.

From-SVN: r207460

gcc/ChangeLog

 2014-02-04  Jakub Jelinek  <jakub@redhat.com>
 
+	PR rtl-optimization/57915
+	* recog.c (simplify_while_replacing): If all unary/binary/relational
+	operation arguments are constant, attempt to simplify those.
+
 	PR middle-end/59261
 	* expmed.c (expand_mult): For MODE_VECTOR_INT multiplication
 	if there is no vashl<mode>3 or ashl<mode>3 insn, skip_synth.

gcc/recog.c

@@ -565,7 +565,7 @@ simplify_while_replacing (rtx *loc, rtx to, rtx object,
 {
   rtx x = *loc;
   enum rtx_code code = GET_CODE (x);
-  rtx new_rtx;
+  rtx new_rtx = NULL_RTX;
 
   if (SWAPPABLE_OPERANDS_P (x)
       && swap_commutative_operands_p (XEXP (x, 0), XEXP (x, 1)))
@@ -579,6 +579,35 @@ simplify_while_replacing (rtx *loc, rtx to, rtx object,
       code = GET_CODE (x);
     }
 
+  /* Canonicalize arithmetics with all constant operands.  */
+  switch (GET_RTX_CLASS (code))
+    {
+    case RTX_UNARY:
+      if (CONSTANT_P (XEXP (x, 0)))
+	new_rtx = simplify_unary_operation (code, GET_MODE (x), XEXP (x, 0),
+					    op0_mode);
+      break;
+    case RTX_COMM_ARITH:
+    case RTX_BIN_ARITH:
+      if (CONSTANT_P (XEXP (x, 0)) && CONSTANT_P (XEXP (x, 1)))
+	new_rtx = simplify_binary_operation (code, GET_MODE (x), XEXP (x, 0),
+					     XEXP (x, 1));
+      break;
+    case RTX_COMPARE:
+    case RTX_COMM_COMPARE:
+      if (CONSTANT_P (XEXP (x, 0)) && CONSTANT_P (XEXP (x, 1)))
+	new_rtx = simplify_relational_operation (code, GET_MODE (x), op0_mode,
+						 XEXP (x, 0), XEXP (x, 1));
+      break;
+    default:
+      break;
+    }
+  if (new_rtx)
+    {
+      validate_change (object, loc, new_rtx, 1);
+      return;
+    }
+
   switch (code)
     {
     case PLUS:

gcc/testsuite/ChangeLog

+2014-02-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/57915
+	* gcc.target/i386/pr57915.c: New test.
+
 2014-02-04  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* g++.dg/init/dso_handle2.C: Compile with -fuse-cxa-atexit.

gcc/testsuite/gcc.target/i386/pr57915.c

+/* PR rtl-optimization/57915 */
+/* { dg-do compile } */
+/* { dg-options "-Os" } */
+
+extern struct T { char a[8]; char b[16]; } t;
+int c;
+void foo (void);
+
+extern inline char *
+baz (char *x, const char *y)
+{
+  const char *e = y;
+  unsigned long f, g;
+  asm ("" : "+c" (f), "+D" (e) : "a" ('\0'), "X" (*e));
+  g = e - 1 - y;
+  __builtin_memcpy (x, y, g);
+  x[g] = '\0';
+  return x;
+}
+
+void
+bar (void)
+{
+  char d[16];
+  baz (d, t.b);
+
+  for (;;)
+    {
+      foo ();
+      if (c)
+	baz (d, t.b);
+    }
+}