rs6000.c (rs6000_emit_prologue): Use 5 nops, instead of 4.

        * config/rs6000/rs6000.c (rs6000_emit_prologue): Use 5 nops,
        instead of 4.

From-SVN: r97871

gcc/ChangeLog

@@ -8,6 +8,9 @@
 2005-04-08  Mike Stump  <mrs@apple.com>
 
 	* config/darwin.c (indirect_data): Fix typo in strncmp logic.
+	
+	* config/rs6000/rs6000.c (rs6000_emit_prologue): Use 5 nops,
+	instead of 4.
 
 2005-04-08  Kazu Hirata  <kazu@cs.umass.edu>
 

gcc/config/darwin.c

@@ -59,8 +59,8 @@ Boston, MA 02111-1307, USA.  */
    existed in the unit to be replaced, and from the new translation
    unit, for new data.
 
-   The changes are to insert 4 nops at the beginning of all functions
-   and to use indirection to get at static duration data.  The 4 nops
+   The changes are to insert 5 nops at the beginning of all functions
+   and to use indirection to get at static duration data.  The 5 nops
    are required by consumers of the generated code.  Currently, gdb
    uses this to patch in a jump to the overriding function, this
    allows all uses of the old name to forward to the replacement,

gcc/config/rs6000/darwin.h

@@ -406,7 +406,7 @@ extern const char *darwin_one_byte_bool;
 #define HAS_MD_FALLBACK_FRAME_STATE_FOR 1
 
 /* True, iff we're generating fast turn around debugging code.  When
-   true, we arrange for function prologues to start with 4 nops so
+   true, we arrange for function prologues to start with 5 nops so
    that gdb may insert code to redirect them, and for data to be
    accessed indirectly.  The runtime uses this indirection to forward
    references for data to the original instance of that data.  */

gcc/config/rs6000/rs6000.c

@@ -12565,7 +12565,7 @@ rs6000_emit_prologue (void)
   if (TARGET_FIX_AND_CONTINUE)
     {
       /* gdb on darwin arranges to forward a function from the old
-	 address by modifying the first 4 instructions of the function
+	 address by modifying the first 5 instructions of the function
 	 to branch to the overriding function.  This is necessary to
 	 permit function pointers that point to the old function to
 	 actually forward to the new function.  */
@@ -12573,6 +12573,7 @@ rs6000_emit_prologue (void)
       emit_insn (gen_nop ());
       emit_insn (gen_nop ());
       emit_insn (gen_nop ());
+      emit_insn (gen_nop ());
     }
 
   if (TARGET_SPE_ABI && info->spe_64bit_regs_used != 0)