reload1.c (choose_reload_regs): Mind CLASS_CANNOT_CHANGE_SIZE while looking for…

reload1.c (choose_reload_regs): Mind CLASS_CANNOT_CHANGE_SIZE while looking for a register to inherit from.

        * reload1.c (choose_reload_regs): Mind CLASS_CANNOT_CHANGE_SIZE
        while looking for a register to inherit from.

From-SVN: r34420

gcc/ChangeLog

+2000-06-05  Richard Henderson  <rth@cygnus.com>
+
+	* reload1.c (choose_reload_regs): Mind CLASS_CANNOT_CHANGE_SIZE
+	while looking for a register to inherit from.
+
 2000-06-05  Jason Merrill  <jason@casey.soma.redhat.com>
 
 	* Makefile.in (libgcc.ready): Lose.

gcc/reload1.c

@@ -5308,8 +5308,18 @@ choose_reload_regs (chain)
 
 		  i = REGNO (last_reg) + word;
 		  last_class = REGNO_REG_CLASS (i);
-		  if ((GET_MODE_SIZE (GET_MODE (last_reg))
+		  if (
+#ifdef CLASS_CANNOT_CHANGE_SIZE
+		      (TEST_HARD_REG_BIT
+		       (reg_class_contents[CLASS_CANNOT_CHANGE_SIZE], i)
+		       ? (GET_MODE_SIZE (GET_MODE (last_reg))
+			  == GET_MODE_SIZE (mode) + word * UNITS_PER_WORD)
+		       : (GET_MODE_SIZE (GET_MODE (last_reg))
+			  >= GET_MODE_SIZE (mode) + word * UNITS_PER_WORD))
+#else
+		      (GET_MODE_SIZE (GET_MODE (last_reg))
 		       >= GET_MODE_SIZE (mode) + word * UNITS_PER_WORD)
+#endif
 		      && reg_reloaded_contents[i] == regno
 		      && TEST_HARD_REG_BIT (reg_reloaded_valid, i)
 		      && HARD_REGNO_MODE_OK (i, rld[r].mode)