loop.c (invariant_p): Don't test flag_rerun_loop_opt.

        * loop.c (invariant_p): Don't test flag_rerun_loop_opt.
        (loop_optimize, scan_loop, strength_reduce): New argument unroll_p.
        * toplev.c (rest_of_compilation): Pass it.  Remove code to
        save / clear / restore flag_unroll_{,all_}loops.

        * i386.c (notice_update_cc): Remove bogus pentium GCC code.

        * stmt.c (warn_if_unused_value): Don't warn for TRY_CATCH_EXPR.
Various pending patches.

From-SVN: r16973

gcc/ChangeLog

+Fri Dec  5 18:26:25 1997  J"orn Rennecke <amylaar@cygnus.co.uk>
+
+	* loop.c (invariant_p): Don't test flag_rerun_loop_opt.
+	(loop_optimize, scan_loop, strength_reduce): New argument unroll_p.
+	* toplev.c (rest_of_compilation): Pass it.  Remove code to
+	save / clear / restore flag_unroll_{,all_}loops.
+
+Fri Dec  5 16:26:03 1997  Bernd Schmidt <crux@ohara.Informatik.RWTH-Aachen.DE>
+
+	* i386.c (notice_update_cc): Remove bogus pentium GCC code.
+
+Fri Dec  5 16:25:14 1997  Jeffrey A Law  (law@cygnus.com)
+
+	* stmt.c (warn_if_unused_value): Don't warn for TRY_CATCH_EXPR.
+
 Thu Dec  4 11:51:00 1997  Jason Merrill  <jason@yorick.cygnus.com>
 
 	* except.c (get_dynamic_handler_chain): Only make the call once per

gcc/config/i386/i386.c

@@ -3543,15 +3543,6 @@ notice_update_cc (exp)
       if (SET_DEST (exp) == pc_rtx)
 	return;
 
-#ifdef IS_STACK_MODE
-      /* Moving into a memory of stack_mode may have been moved
-         in between the use and set of cc0 by loop_spl(). So
-         old value of cc.status must be retained */
-      if (GET_CODE(SET_DEST(exp)) == MEM 
-	  && IS_STACK_MODE (GET_MODE (SET_DEST (exp))))
-	return;
-#endif
-
       /* Moving register or memory into a register:
 	 it doesn't alter the cc's, but it might invalidate
 	 the RTX's which we remember the cc's came from.

gcc/f/intdoc.texi

@@ -6355,7 +6355,7 @@ Int2(@var{A})
 Int2: @code{INTEGER(KIND=6)} function.
 
 @noindent
-@var{A}: @code{INTEGER}; scalar; INTENT(IN).
+@var{A}: @code{INTEGER}, @code{REAL}, or @code{COMPLEX}; scalar; INTENT(IN).
 
 @noindent
 Intrinsic groups: @code{gnu}.
@@ -6390,7 +6390,7 @@ Int8(@var{A})
 Int8: @code{INTEGER(KIND=2)} function.
 
 @noindent
-@var{A}: @code{INTEGER}; scalar; INTENT(IN).
+@var{A}: @code{INTEGER}, @code{REAL}, or @code{COMPLEX}; scalar; INTENT(IN).
 
 @noindent
 Intrinsic groups: @code{gnu}.

gcc/loop.c

@@ -374,10 +374,11 @@ init_loop ()
    (or 0 if none should be output).  */
 
 void
-loop_optimize (f, dumpfile)
+loop_optimize (f, dumpfile, unroll_p)
      /* f is the first instruction of a chain of insns for one function */
      rtx f;
      FILE *dumpfile;
+     int unroll_p;
 {
   register rtx insn;
   register int i;
@@ -502,7 +503,7 @@ loop_optimize (f, dumpfile)
       uid_luid[i] = uid_luid[i - 1];
 
   /* Create a mapping from loops to BLOCK tree nodes.  */
-  if (flag_unroll_loops && write_symbols != NO_DEBUG)
+  if (unroll_p && write_symbols != NO_DEBUG)
     find_loop_tree_blocks ();
 
   /* Determine if the function has indirect jump.  On some systems
@@ -514,12 +515,12 @@ loop_optimize (f, dumpfile)
   for (i = max_loop_num-1; i >= 0; i--)
     if (! loop_invalid[i] && loop_number_loop_ends[i])
       scan_loop (loop_number_loop_starts[i], loop_number_loop_ends[i],
-		 max_reg_num ());
+		 max_reg_num (), unroll_p);
 
   /* If debugging and unrolling loops, we must replicate the tree nodes
      corresponding to the blocks inside the loop, so that the original one
      to one mapping will remain.  */
-  if (flag_unroll_loops && write_symbols != NO_DEBUG)
+  if (unroll_p && write_symbols != NO_DEBUG)
     unroll_block_trees ();
 }
 
@@ -534,9 +535,10 @@ loop_optimize (f, dumpfile)
    write, then we can also mark the memory read as invariant.  */
 
 static void
-scan_loop (loop_start, end, nregs)
+scan_loop (loop_start, end, nregs, unroll_p)
      rtx loop_start, end;
      int nregs;
+     int unroll_p;
 {
   register int i;
   register rtx p;
@@ -1051,7 +1053,7 @@ scan_loop (loop_start, end, nregs)
 
   if (flag_strength_reduce)
     strength_reduce (scan_start, end, loop_top,
-		     insn_count, loop_start, end);
+		     insn_count, loop_start, end, unroll_p);
 }
 
 /* Add elements to *OUTPUT to record all the pseudo-regs
@@ -2847,12 +2849,7 @@ invariant_p (x)
 
 	 We don't know the loop bounds here though, so just fail for all
 	 labels.  */
-      /* ??? This is also necessary if flag_rerun_loop_opt is true, because in
-	 this case we may be doing loop unrolling the second time we run loop,
-	 and hence the first loop run also needs this check.  There is no way
-	 to check here whether the second run will actually do loop unrolling
-	 though, as that info is in a local var in rest_of_compilation.  */
-      if (flag_unroll_loops || flag_rerun_loop_opt)
+      if (flag_unroll_loops)
 	return 0;
       else
 	return 1;
@@ -3339,13 +3336,14 @@ static rtx addr_placeholder;
 
 static void
 strength_reduce (scan_start, end, loop_top, insn_count,
-		 loop_start, loop_end)
+		 loop_start, loop_end, unroll_p)
      rtx scan_start;
      rtx end;
      rtx loop_top;
      int insn_count;
      rtx loop_start;
      rtx loop_end;
+     int unroll_p;
 {
   rtx p;
   rtx set;
@@ -3583,7 +3581,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
     {
       /* Can still unroll the loop anyways, but indicate that there is no
 	 strength reduction info available.  */
-      if (flag_unroll_loops)
+      if (unroll_p)
 	unroll_loop (loop_end, insn_count, loop_start, end_insert_before, 0);
 
       return;
@@ -4362,7 +4360,7 @@ strength_reduce (scan_start, end, loop_top, insn_count,
      induction variable information that strength_reduce has already
      collected.  */
   
-  if (flag_unroll_loops)
+  if (unroll_p)
     unroll_loop (loop_end, insn_count, loop_start, end_insert_before, 1);
 
 #ifdef HAIFA

gcc/stmt.c

@@ -1873,6 +1873,7 @@ warn_if_unused_value (exp)
     case CALL_EXPR:
     case METHOD_CALL_EXPR:
     case RTL_EXPR:
+    case TRY_CATCH_EXPR:
     case WITH_CLEANUP_EXPR:
     case EXIT_EXPR:
       /* We don't warn about COND_EXPR because it may be a useful

gcc/toplev.c

@@ -3313,28 +3313,17 @@ rest_of_compilation (decl)
     {
       TIMEVAR (loop_time,
 	       {
-		 int save_flag_unroll_loops;
-		 int save_flag_unroll_all_loops;
-
 		 if (flag_rerun_loop_opt)
 		   {
 		      /* We only want to perform unrolling once.  */
-		      save_flag_unroll_loops = flag_unroll_loops;
-		      save_flag_unroll_all_loops = flag_unroll_all_loops;
-		      flag_unroll_loops = 0;
-		      flag_unroll_all_loops = 0;
 
-		      loop_optimize (insns, loop_dump_file);
+		      loop_optimize (insns, loop_dump_file, 0);
 
 		      /* The regscan pass may not be necessary, but let's
 			 be safe until we can prove otherwise.  */
 		      reg_scan (insns, max_reg_num (), 1);
-
-		      /* Restore loop unrolling flags.  */
-		      flag_unroll_loops = save_flag_unroll_loops;
-		      flag_unroll_all_loops = save_flag_unroll_all_loops;
 		   }
-		 loop_optimize (insns, loop_dump_file);
+		 loop_optimize (insns, loop_dump_file, flag_unroll_loops);
 	       });
     }