gcse.c (gcse_main): Fix comment typo.

	* gcse.c (gcse_main): Fix comment typo.
	(delete_null_pointer_check): Likewise.
	(hash_scan_set): Don't consider sets with REG_EQUIV MEM notes.
	* cse.c (cse_insn): Likewise.
	* function.c (fixup_var_refs_insns_with_hash): The sequence is
	toplevel.

	* gcc.c-torture/execute/20010403-1.c: New test.

From-SVN: r41444

gcc/ChangeLog

+2001-04-20  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcse.c (gcse_main): Fix comment typo.
+	(delete_null_pointer_check): Likewise.
+	(hash_scan_set): Don't consider sets with REG_EQUIV MEM notes.
+	* cse.c (cse_insn): Likewise.
+	* function.c (fixup_var_refs_insns_with_hash): The sequence is
+	toplevel.
+
 2001-04-19  Zack Weinberg  <zackw@stanford.edu>
 
 	* toplev.c: Excise all code for the undocumented -dm option.

gcc/cse.c

@@ -5067,18 +5067,16 @@ cse_insn (insn, libcall_insn)
       sets[i].src_in_memory = hash_arg_in_memory;
 
       /* If SRC is a MEM, there is a REG_EQUIV note for SRC, and DEST is
-	 a pseudo that is set more than once, do not record SRC.  Using
-	 SRC as a replacement for anything else will be incorrect in that
-	 situation.  Note that this usually occurs only for stack slots,
-	 in which case all the RTL would be referring to SRC, so we don't
-	 lose any optimization opportunities by not having SRC in the
-	 hash table.  */
+	 a pseudo, do not record SRC.  Using SRC as a replacement for
+	 anything else will be incorrect in that situation.  Note that
+	 this usually occurs only for stack slots, in which case all the
+	 RTL would be referring to SRC, so we don't lose any optimization
+	 opportunities by not having SRC in the hash table.  */
 
       if (GET_CODE (src) == MEM
-	  && find_reg_note (insn, REG_EQUIV, src) != 0
+	  && find_reg_note (insn, REG_EQUIV, NULL_RTX) != 0
 	  && GET_CODE (dest) == REG
-	  && REGNO (dest) >= FIRST_PSEUDO_REGISTER
-	  && REG_N_SETS (REGNO (dest)) != 1)
+	  && REGNO (dest) >= FIRST_PSEUDO_REGISTER)
 	sets[i].src_volatile = 1;
 
 #if 0

gcc/function.c

@@ -1682,7 +1682,7 @@ fixup_var_refs_insns_with_hash (ht, var, promoted_mode, unsignedp)
       rtx insn = XEXP (insn_list, 0);
 	
       if (INSN_P (insn))
-	fixup_var_refs_insn (insn, var, promoted_mode, unsignedp, 0);
+	fixup_var_refs_insn (insn, var, promoted_mode, unsignedp, 1);
 
       insn_list = XEXP (insn_list, 1);
     }

gcc/gcse.c

@@ -756,7 +756,7 @@ gcse_main (f, file)
      a high connectivity will take a long time and is unlikely to be
      particularly useful.
 
-     In normal circumstances a cfg should have about twice has many edges
+     In normal circumstances a cfg should have about twice as many edges
      as blocks.  But we do not want to punish small functions which have
      a couple switch statements.  So we require a relatively large number
      of basic blocks and the ratio of edges to blocks to be high.  */
@@ -2208,7 +2208,14 @@ hash_scan_set (pat, insn, set_p)
 	  /* Is SET_SRC something we want to gcse?  */
 	  && want_to_gcse_p (src)
 	  /* Don't CSE a nop.  */
-	  && ! set_noop_p (pat))
+	  && ! set_noop_p (pat)
+	  /* Don't GCSE if it has attached REG_EQUIV note.
+	     At this point this only function parameters should have
+	     REG_EQUIV notes and if the argument slot is used somewhere
+	     explicitely, it means address of parameter has been taken,
+	     so we should not extend the lifetime of the pseudo.  */
+	  && ((note = find_reg_note (insn, REG_EQUIV, NULL_RTX)) == 0
+	      || GET_CODE (XEXP (note, 0)) != MEM))
 	{
 	  /* An expression is not anticipatable if its operands are
 	     modified before this insn or if this is not the only SET in
@@ -5541,7 +5548,7 @@ delete_null_pointer_checks (f)
      a high connectivity will take a long time and is unlikely to be
      particularly useful.
 
-     In normal circumstances a cfg should have about twice has many edges
+     In normal circumstances a cfg should have about twice as many edges
      as blocks.  But we do not want to punish small functions which have
      a couple switch statements.  So we require a relatively large number
      of basic blocks and the ratio of edges to blocks to be high.  */

gcc/testsuite/ChangeLog

+2001-04-20  Jakub Jelinek  <jakub@redhat.com>
+
+	* gcc.c-torture/execute/20010403-1.c: New test.
+
 2001-04-19  David Billinghurst <David.Billinghurst@riotinto.com>
 	    Mark Mitchell  <mark@codesourcery.com>