sched-deps.c (sched_analyze_1): On STACK_REGS targets...

	* sched-deps.c (sched_analyze_1): On STACK_REGS targets, x87, treat
	all writes to any stack register as a read/write dependency on
	FIRST_STACK_REG.
	(sched_analyze_2): Likewise, for reads from any stack register.

From-SVN: r98762

gcc/ChangeLog

+2005-04-25  Roger Sayle  <roger@eyesopen.com>
+
+	* sched-deps.c (sched_analyze_1): On STACK_REGS targets, x87, treat
+	all writes to any stack register as a read/write dependency on
+	FIRST_STACK_REG.
+	(sched_analyze_2): Likewise, for reads from any stack register.
+
 2005-04-25  Richard Henderson  <rth@redhat.com>
 
 	* final.c (output_addr_const): Revert 2005-04-09 change.

gcc/sched-deps.c

@@ -534,6 +534,15 @@ sched_analyze_1 (struct deps *deps, rtx x, rtx insn)
     {
       regno = REGNO (dest);
 
+#ifdef STACK_REGS
+      /* Treat all writes to a stack register as modifying the TOS.  */
+      if (regno >= FIRST_STACK_REG && regno <= LAST_STACK_REG)
+	{
+	  SET_REGNO_REG_SET (reg_pending_uses, FIRST_STACK_REG);
+	  regno = FIRST_STACK_REG;
+	}
+#endif
+
       /* A hard reg in a wide mode may really be multiple registers.
          If so, mark all of them just like the first.  */
       if (regno < FIRST_PSEUDO_REGISTER)
@@ -684,6 +693,16 @@ sched_analyze_2 (struct deps *deps, rtx x, rtx insn)
     case REG:
       {
 	int regno = REGNO (x);
+
+#ifdef STACK_REGS
+      /* Treat all reads of a stack register as modifying the TOS.  */
+      if (regno >= FIRST_STACK_REG && regno <= LAST_STACK_REG)
+	{
+	  SET_REGNO_REG_SET (reg_pending_sets, FIRST_STACK_REG);
+	  regno = FIRST_STACK_REG;
+	}
+#endif
+
 	if (regno < FIRST_PSEUDO_REGISTER)
 	  {
 	    int i = hard_regno_nregs[regno][GET_MODE (x)];