emit-rtl.c (subreg_hard_regno): Only do HARD_REGNO_MODE_OK check if check_mode is non-zero.

	* emit-rtl.c (subreg_hard_regno): Only do HARD_REGNO_MODE_OK check
	if check_mode is non-zero.

	* gcc.dg/20010423-1.c: New test.

From-SVN: r41537

gcc/ChangeLog

 2001-04-25  Jakub Jelinek  <jakub@redhat.com>
 
+	* emit-rtl.c (subreg_hard_regno): Only do HARD_REGNO_MODE_OK check
+	if check_mode is non-zero.
+
+2001-04-25  Jakub Jelinek  <jakub@redhat.com>
+
 	* config/i386/i386.c (ix86_expand_int_movcc): If overlap between
 	out and comparison sequence has been detected, put result into
 	proper temporary pseudo.

gcc/emit-rtl.c

@@ -719,7 +719,7 @@ subreg_hard_regno (x, check_mode)
   base_regno = REGNO (reg);
   if (base_regno >= FIRST_PSEUDO_REGISTER)
     abort ();
-  if (! HARD_REGNO_MODE_OK (base_regno, GET_MODE (reg)))
+  if (check_mode && ! HARD_REGNO_MODE_OK (base_regno, GET_MODE (reg)))
     abort ();
 
   /* Catch non-congruent offsets too.  */

gcc/testsuite/ChangeLog

 2001-04-25  Jakub Jelinek  <jakub@redhat.com>
 
+	* gcc.dg/20010423-1.c: New test.
+
+2001-04-25  Jakub Jelinek  <jakub@redhat.com>
+
 	* gcc.c-torture/execute/20010422-1.c: New test.
 
 2001-04-25  Nathan Sidwell  <nathan@codesourcery.com>

gcc/testsuite/gcc.dg/20010423-1.c

+/* { dg-do compile { target ia64-*-* } } */
+/* { dg-options "-O2" } */
+
+int __sync_fetch_and_add_si (int *, int);
+
+inline unsigned int
+bar (volatile unsigned int *mem, unsigned int val)
+{
+  return __sync_fetch_and_add_si((int *)mem, (int)val);
+}
+
+volatile unsigned int x;
+
+void foo (unsigned short *a)
+{
+  *a = bar (&x, 1) + 1;
+}