Handle multiword modes in regno_clobbered_p

From-SVN: r36233

gcc/ChangeLog

@@ -2,7 +2,10 @@
 
 	* rtl.c (class_narrowest_mode): Add entries for MODE_VECTOR_INT and
 	MODE_VECTOR_FLOAT.
-
+	* reload.c (regno_clobbered_p): Accept new arg, MODE, and use it
+	to handle multiword modes correctly.  All callers and the declaration
+	changed.
+  
 2000-09-06  Mark Mitchell  <mark@codesourcery.com>
 
 	* c-common.h (prep_stmt): Declare.

gcc/reload.c

@@ -4519,7 +4519,7 @@ find_reloads_address (mode, memrefloc, ad, loc, opnum, type, ind_levels, insn)
 
       else if (regno < FIRST_PSEUDO_REGISTER
 	       && REGNO_MODE_OK_FOR_BASE_P (regno, mode)
-	       && ! regno_clobbered_p (regno, this_insn))
+	       && ! regno_clobbered_p (regno, this_insn, mode))
 	return 0;
 
       /* If we do not have one of the cases above, we must do the reload.  */
@@ -5427,7 +5427,7 @@ find_reloads_address_1 (mode, x, context, loc, opnum, type, ind_levels, insn)
 	   in this insn, reload it into some other register to be safe.
 	   The CLOBBER is supposed to make the register unavailable
 	   from before this insn to after it.  */
-	if (regno_clobbered_p (regno, this_insn))
+	if (regno_clobbered_p (regno, this_insn, GET_MODE (x)))
 	  {
 	    push_reload (x, NULL_RTX, loc, NULL_PTR,
 			 (context ? INDEX_REG_CLASS : BASE_REG_CLASS),
@@ -6544,13 +6544,21 @@ find_inc_amount (x, inced)
 /* Return 1 if register REGNO is the subject of a clobber in insn INSN.  */
 
 int
-regno_clobbered_p (regno, insn)
+regno_clobbered_p (regno, insn, mode)
      unsigned int regno;
      rtx insn;
+     enum machine_mode mode;
 {
+  int nregs = HARD_REGNO_NREGS (regno, mode);
+  int endregno = regno + nregs;
+
   if (GET_CODE (PATTERN (insn)) == CLOBBER
       && GET_CODE (XEXP (PATTERN (insn), 0)) == REG)
-    return REGNO (XEXP (PATTERN (insn), 0)) == regno;
+    {
+      int test = REGNO (XEXP (PATTERN (insn), 0));
+
+      return regno >= test && test < endregno;
+    }
 
   if (GET_CODE (PATTERN (insn)) == PARALLEL)
     {
@@ -6559,9 +6567,13 @@ regno_clobbered_p (regno, insn)
       for (; i >= 0; i--)
 	{
 	  rtx elt = XVECEXP (PATTERN (insn), 0, i);
-	  if (GET_CODE (elt) == CLOBBER && GET_CODE (XEXP (elt, 0)) == REG
-	      && REGNO (XEXP (elt, 0)) == regno)
-	    return 1;
+	  if (GET_CODE (elt) == CLOBBER && GET_CODE (XEXP (elt, 0)) == REG)
+	    {
+	      int test = REGNO (XEXP (elt, 0));
+	      
+	      if (regno >= test && test < endregno)
+		return 1;
+	    }
 	}
     }
 

gcc/reload.h

@@ -335,7 +335,7 @@ extern rtx find_equiv_reg PARAMS ((rtx, rtx, enum reg_class, int, short *,
 				 int, enum machine_mode));
 
 /* Return 1 if register REGNO is the subject of a clobber in insn INSN.  */
-extern int regno_clobbered_p PARAMS ((unsigned int, rtx));
+extern int regno_clobbered_p PARAMS ((unsigned int, rtx, enum machine_mode));
 
 /* Return 1 if X is an operand of an insn that is being earlyclobbered.  */
 int earlyclobber_operand_p PARAMS ((rtx));

gcc/reload1.c

@@ -5514,7 +5514,7 @@ choose_reload_regs (chain)
 		 In particular, we then can't use EQUIV for a
 		 RELOAD_FOR_OUTPUT_ADDRESS reload.  */
 
-	      if (equiv != 0 && regno_clobbered_p (regno, insn))
+	      if (equiv != 0 && regno_clobbered_p (regno, insn, rld[r].mode))
 		{
 		  switch (rld[r].when_needed)
 		    {
@@ -6536,7 +6536,7 @@ emit_output_reload_insns (chain, rl, j)
 	  || !(set = single_set (insn))
 	  || rtx_equal_p (old, SET_DEST (set))
 	  || !reg_mentioned_p (old, SET_SRC (set))
-	  || !regno_clobbered_p (REGNO (old), insn))
+	  || !regno_clobbered_p (REGNO (old), insn, rl->mode))
 	gen_reload (old, reloadreg, rl->opnum,
 		    rl->when_needed);
     }