re PR rtl-optimization/8812 ([avr] Registers allocated for two uses at once)

PR target/8812
* reload1.c (choose_reload_regs): For equiv reg, add loop over all
hard regs for reload_reg_used_at_all and reg_class_contents checks.

From-SVN: r67751

gcc/ChangeLog

+2003-06-10  James E Wilson  <wilson@tuliptree.org>
+
+	PR target/8812
+	* reload1.c (choose_reload_regs): For equiv reg, add loop over all
+	hard regs for reload_reg_used_at_all and reg_class_contents checks.
+
 2003-06-10  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* config/h8300/h8300.c (print_operand): Remove support for

gcc/reload1.c

@@ -5685,14 +5685,27 @@ choose_reload_regs (chain)
 
 	      /* If we found a spill reg, reject it unless it is free
 		 and of the desired class.  */
-	      if (equiv != 0
-		  && ((TEST_HARD_REG_BIT (reload_reg_used_at_all, regno)
+	      if (equiv != 0)
+		{
+		  int regs_used = 0;
+		  int bad_for_class = 0;
+		  int max_regno = regno + rld[r].nregs;
+
+		  for (i = regno; i < max_regno; i++)
+		    {
+		      regs_used |= TEST_HARD_REG_BIT (reload_reg_used_at_all,
+						      i);
+		      bad_for_class |= ! TEST_HARD_REG_BIT (reg_class_contents[(int) rld[r].class], 
+							   i);
+		    }
+
+		  if ((regs_used
 		       && ! free_for_value_p (regno, rld[r].mode,
 					      rld[r].opnum, rld[r].when_needed,
 					      rld[r].in, rld[r].out, r, 1))
-		      || ! TEST_HARD_REG_BIT (reg_class_contents[(int) rld[r].class],
-					      regno)))
-		equiv = 0;
+		      || bad_for_class)
+		    equiv = 0;
+		}
 
 	      if (equiv != 0 && ! HARD_REGNO_MODE_OK (regno, rld[r].mode))
 		equiv = 0;