function.c (purge_addressof_1): Add libcall check.

2003-11-11  Eric Christopher  <echristo@redhat.com>

	* function.c (purge_addressof_1): Add libcall check.
	Remove test for cached replacements on fallback case.
	Simplify mode comparisons. Add libcall test for
	paradoxical subregs.

From-SVN: r73479

gcc/ChangeLog

+2003-11-11  Eric Christopher  <echristo@redhat.com>
+
+	* function.c (purge_addressof_1): Add libcall check.
+	Remove test for cached replacements on fallback case.
+	Simplify mode comparisons. Add libcall test for
+	paradoxical subregs.
+
 2003-11-11  Kazu Hirata  <kazu@cs.umass.edu>
 
 	* config/h8300/t-h8300: Fix an obsolete comment.
@@ -46,7 +53,7 @@
 	anything other than VISIBILITY_DEFAULT and VISIBILITY_HIDDEN.
 	* config/darwin.h (TARGET_ASM_ASSEMBLE_VISIBILITY): Use
 	darwin_assemble_visibility instead of default.
-	
+
 2003-11-10  Waldek Hebisch  <hebisch@math.uni.wroc.pl>
 
 	PR target/12865
@@ -186,10 +193,10 @@
 	(decl_visibility): Remove declaration.
 	* varasm.c (maybe_assemble_visibility): Use DECL_VISIBILITY
 	instead of decl_visibility.
-	(default_binds_local_p_1):  Use DECL_VISIBILITY	instead of 
+	(default_binds_local_p_1):  Use DECL_VISIBILITY	instead of
 	decl_visibility.
 	(decl_visibility): Remove.
-	
+
 2003-11-06  Ulrich Weigand  <uweigand@de.ibm.com>
 
 	* config/s390/s390.c (s390_emit_epilogue): Recognize more cases

gcc/function.c

@@ -2929,6 +2929,7 @@ purge_addressof_1 (rtx *loc, rtx insn, int force, int store, int may_postpone,
   int i, j;
   const char *fmt;
   bool result = true;
+  bool libcall = false;
 
   /* Re-start here to avoid recursion in common cases.  */
  restart:
@@ -2937,6 +2938,10 @@ purge_addressof_1 (rtx *loc, rtx insn, int force, int store, int may_postpone,
   if (x == 0)
     return true;
 
+  /* Is this a libcall?  */
+  if (!insn)
+    libcall = REG_NOTE_KIND (*loc) == REG_RETVAL;
+
   code = GET_CODE (x);
 
   /* If we don't return in any of the cases below, we will recurse inside
@@ -3070,31 +3075,27 @@ purge_addressof_1 (rtx *loc, rtx insn, int force, int store, int may_postpone,
 		 which can be succinctly described with a simple SUBREG.
 		 Note that removing the REG_EQUAL note is not an option
 		 on the last insn of a libcall, so we must do a replacement.  */
-	      if (! purge_addressof_replacements
-		  && ! purge_bitfield_addressof_replacements)
-		{
-		  /* In compile/990107-1.c:7 compiled at -O1 -m1 for sh-elf,
-		     we got
-		     (mem:DI (addressof:SI (reg/v:DF 160) 159 0x401c8510)
-		      [0 S8 A32]), which can be expressed with a simple
-		     same-size subreg  */
-		  if ((GET_MODE_SIZE (GET_MODE (x))
-		       == GET_MODE_SIZE (GET_MODE (sub)))
-		      /* Again, invalid pointer casts (as in
-			 compile/990203-1.c) can require paradoxical
-			 subregs.  */
-		      || (GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD
-			  && (GET_MODE_SIZE (GET_MODE (x))
-			      > GET_MODE_SIZE (GET_MODE (sub))))
-		      || (GET_MODE_SIZE (GET_MODE (x))
-			  < GET_MODE_SIZE (GET_MODE (sub))))
 
-		    {
-		      *loc = gen_rtx_SUBREG (GET_MODE (x), sub, 0);
-		      return true;
-		    }
-		  /* ??? Are there other cases we should handle?  */
+	      /* In compile/990107-1.c:7 compiled at -O1 -m1 for sh-elf,
+		 we got
+		 (mem:DI (addressof:SI (reg/v:DF 160) 159 0x401c8510)
+		 [0 S8 A32]), which can be expressed with a simple
+		 same-size subreg  */
+	      if ((GET_MODE_SIZE (GET_MODE (x))
+		   <= GET_MODE_SIZE (GET_MODE (sub)))
+		  /* Again, invalid pointer casts (as in
+		     compile/990203-1.c) can require paradoxical
+		     subregs.  */
+		  || (GET_MODE_SIZE (GET_MODE (x)) > UNITS_PER_WORD
+		      && (GET_MODE_SIZE (GET_MODE (x))
+			  > GET_MODE_SIZE (GET_MODE (sub)))
+		      && libcall))
+		{
+		  *loc = gen_rtx_SUBREG (GET_MODE (x), sub, 0);
+		  return true;
 		}
+	      /* ??? Are there other cases we should handle?  */
+
 	      /* Sometimes we may not be able to find the replacement.  For
 		 example when the original insn was a MEM in a wider mode,
 		 and the note is part of a sign extension of a narrowed