reload1.c (reload_reg_free_for_value_p): Don't use a register that is in reload_reg_used.

Thu Nov  4 15:52:35 1999  Andrew Haley  <aph@cygnus.com>

	* reload1.c (reload_reg_free_for_value_p): Don't use a register
	that is in reload_reg_used.

From-SVN: r30461

gcc/ChangeLog

+Thu Nov  4 15:52:35 1999  Andrew Haley  <aph@cygnus.com>
+
+	* reload1.c (reload_reg_free_for_value_p): Don't use a register
+	that is in reload_reg_used.
+
 Tue Nov  9 16:43:00 1999  Nick Clifton  <nickc@cygnus.com>
 
 	* config/arm/arm-protos.h: New file: Prototypes for functions

gcc/reload1.c

@@ -5307,6 +5307,13 @@ reload_reg_free_for_value_p (regno, opnum, type, value, out, reloadnum,
   int i;
   int copy = 0;
 
+  /* ??? reload_reg_used is abused to hold the registers that are not
+     available as spill registers, including hard registers that are
+     earlyclobbered in asms.  As a temporary measure, reject anything
+     in reload_reg_used.  */
+  if (TEST_HARD_REG_BIT (reload_reg_used, regno))
+    return 0;
+
   if (out == const0_rtx)
     {
       copy = 1;