re PR rtl-optimization/25578 (gfortran version 4.2.0 20051227 - 144 new…

re PR rtl-optimization/25578 (gfortran  version 4.2.0 20051227 - 144 new testsuite failures since 2005121)

gcc:
2006-01-03  Paolo Bonzini  <bonzini@gnu.org>

	PR rtl-optimization/25578
	* combine.c (combine_simplify_rtx, force_to_mode): Don't
	pass a parameter to simplify_shift_const if changing ASHIFTRT
	to LSHIFTRT.

gcc/testsuite:
2006-01-03  Paolo Bonzini  <bonzini@gnu.org>

	PR rtl-optimization/25578
	* gcc.c-torture/execute/20060102-1.c: New testcase.

From-SVN: r109281

gcc/ChangeLog

+2006-01-03  Paolo Bonzini  <bonzini@gnu.org>
+
+	PR rtl-optimization/25578
+	* combine.c (combine_simplify_rtx, force_to_mode): Don't
+	pass a parameter to simplify_shift_const if changing ASHIFTRT
+	to LSHIFTRT.
+
 2006-01-03  Adrian Straetling  <straetling@de.ibm.com>
 
 	* gcc/builtins.c (get_builtin_sync_mem): New function.

gcc/combine.c

 /* Optimize by combining instructions for GNU compiler.
    Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
-   1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -4321,7 +4321,7 @@ combine_simplify_rtx (rtx x, enum machine_mode op0_mode, int in_dest)
       if (GET_CODE (temp) == ASHIFTRT
 	  && GET_CODE (XEXP (temp, 1)) == CONST_INT
 	  && INTVAL (XEXP (temp, 1)) == GET_MODE_BITSIZE (mode) - 1)
-	return simplify_shift_const (temp, LSHIFTRT, mode, XEXP (temp, 0),
+	return simplify_shift_const (NULL_RTX, LSHIFTRT, mode, XEXP (temp, 0),
 				     INTVAL (XEXP (temp, 1)));
 
       /* If X has only a single bit that might be nonzero, say, bit I, convert
@@ -7103,7 +7103,7 @@ force_to_mode (rtx x, enum machine_mode mode, unsigned HOST_WIDE_INT mask,
 
 	  if ((mask & ~nonzero) == 0)
 	    {
-	      x = simplify_shift_const (x, LSHIFTRT, GET_MODE (x),
+	      x = simplify_shift_const (NULL_RTX, LSHIFTRT, GET_MODE (x),
 					XEXP (x, 0), INTVAL (XEXP (x, 1)));
 	      if (GET_CODE (x) != ASHIFTRT)
 		return force_to_mode (x, mode, mask, next_select);

gcc/testsuite/ChangeLog

+2006-01-03  Paolo Bonzini  <bonzini@gnu.org>
+
+	PR rtl-optimization/25578
+	* gcc.c-torture/execute/20060102-1.c: New testcase.
+
 2006-01-03  Richard Guenther  <rguenther@suse.de>
 
 	PR c/25183

gcc/testsuite/gcc.c-torture/execute/20060102-1.c

+extern void abort ();
+
+int f(int x)
+{
+  return (x >> 31) ? -1 : 1;
+}
+
+int main (int argc)
+{
+  /* Test that the function above returns different values for
+     different signs.  */
+  if (f(argc) == f(-argc))
+    abort ();
+  return 0;
+}
+