reload1.c (compute_use_by_pseudos): Allow reg_renumber[regno] < 0 after reload.

        * reload1.c (compute_use_by_pseudos): Allow reg_renumber[regno] < 0
        after reload.

From-SVN: r24287

gcc/ChangeLog

+Sun Dec 13 00:24:14 1998  J"orn Rennecke <amylaar@cygnus.co.uk>
+
+	* reload1.c (compute_use_by_pseudos): Allow reg_renumber[regno] < 0
+	after reload.
+
 Sat Dec 12 23:39:10 1998  Jeffrey A Law  (law@cygnus.com)
 
 	* i386/next.h (ASM_OUTPUT_ALIGN): Use 0x90 for fill character.

gcc/reload1.c

@@ -536,10 +536,20 @@ compute_use_by_pseudos (to, from)
        int r = reg_renumber[regno];
        int nregs;
        if (r < 0)
+	 {
+	   /* reload_combine uses the information from
+	      basic_block_live_at_start, which might still contain registers
+	      that have not actually been allocated since they have an
+	      equivalence.  */
+	   if (! reload_completed)
 	     abort ();
+	 }
+       else
+	 {
 	   nregs = HARD_REGNO_NREGS (r, PSEUDO_REGNO_MODE (regno));
 	   while (nregs-- > 0)
 	     SET_HARD_REG_BIT (*to, r + nregs);
+	 }
      });
 }