re PR target/21760 (Powerpc atomic builtins missing PPC405 errata)

        PR target/21760
        * config/rs6000/rs6000.h (PPC405_ERRATUM77): New.
        * config/rs6000/rs6000.md: Move atomic instructions to ...
        * config/rs6000/sync.md: Here.
        Change sync_compare_and_swap<mode> to define_expand.  All stwcx
        patterns test PPC405_ERRATUM77.

From-SVN: r101268

gcc/ChangeLog

+2005-06-23  David Edelsohn  <edelsohn@gnu.org>
+
+	PR target/21760
+	* config/rs6000/rs6000.h (PPC405_ERRATUM77): New.
+	* config/rs6000/rs6000.md: Move atomic instructions to ...
+	* config/rs6000/sync.md: Here.
+	Change sync_compare_and_swap<mode> to define_expand.  All stwcx
+	patterns test PPC405_ERRATUM77.
+
 2005-06-23  Jan Hubicka  <jh@suse.cz>
 	
 	* tree-inline.c (copy_body_r): Remap labels correctly.

gcc/config/rs6000/rs6000.h

@@ -49,6 +49,14 @@
 #define TARGET_CPU_DEFAULT ((char *)0)
 #endif
 
+/* If configured for PPC405, support PPC405CR Erratum77.  */
+#define PPC405_CPU_DEFAULT ("405")
+#if #TARGET_CPU_DEFAULT == #PPC405_CPU_DEFAULT
+#define PPC405_ERRATUM77 (rs6000_cpu == PROCESSOR_PPC405)
+#else
+#define PPC405_ERRATUM77 0
+#endif
+
 /* Common ASM definitions used by ASM_SPEC among the various targets
    for handling -mcpu=xxx switches.  */
 #define ASM_CPU_SPEC \