rs6000.h (FIXED_REGISTERS): Use FIXED_R2.

2001-09-17  Dale Johannesen  <dalej@apple.com>

        * config/rs6000/rs6000.h (FIXED_REGISTERS): Use FIXED_R2.
        * config/rs6000/aix.h (FIXED_R2): Define.
        * config/rs6000/darwin.h (FIXED_R2): Define.
        * config/rs6000/sysv4.h (FIXED_R2): Define.

From-SVN: r45669

gcc/ChangeLog

+2001-09-17  Dale Johannesen  <dalej@apple.com>
+
+	* config/rs6000/rs6000.h (FIXED_REGISTERS): Use FIXED_R2.
+	* config/rs6000/aix.h (FIXED_R2): Define.
+	* config/rs6000/darwin.h (FIXED_R2): Define.
+	* config/rs6000/sysv4.h (FIXED_R2): Define.
+
 2001-09-17  Jeff Sturm  <jsturm@one-point.com>
 
 	* except.c (dw2_build_landing_pads): New local

gcc/config/rs6000/aix.h

@@ -161,6 +161,7 @@ Boston, MA 02111-1307, USA.  */
 #define TARGET_NO_TOC		0
 #define	TARGET_TOC		1
 
+#define FIXED_R2 1
 /* AIX allows r13 to be used.  */
 #define FIXED_R13 0
 

gcc/config/rs6000/darwin.h

@@ -39,6 +39,8 @@ Boston, MA 02111-1307, USA.  */
 
 #define CC1_SPEC "%{!static:-fPIC}"
 
+/* Make both r2 and r3 available for allocation.  */
+#define FIXED_R2 0
 #define FIXED_R13 0
 
 #undef  TARGET_DEFAULT

gcc/config/rs6000/rs6000.h

@@ -641,14 +641,15 @@ extern int rs6000_debug_arg;		/* debug argument handling */
 /* 1 for registers that have pervasive standard uses
    and are not available for the register allocator.
 
-   On RS/6000, r1 is used for the stack and r2 is used as the TOC pointer.
+   On RS/6000, r1 is used for the stack.  On Darwin, r2 is available
+   as a local register; for all other OS's r2 is the TOC pointer.
 
    cr5 is not supposed to be used.
 
    On System V implementations, r13 is fixed and not available for use.  */
 
 #define FIXED_REGISTERS  \
-  {0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, FIXED_R13, 0, 0, \
+  {0, 1, FIXED_R2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, FIXED_R13, 0, 0, \
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \

gcc/config/rs6000/sysv4.h

@@ -314,9 +314,9 @@ do {									\
 #undef	PROCESSOR_DEFAULT
 #define	PROCESSOR_DEFAULT PROCESSOR_PPC750
 
+#define FIXED_R2 1
 /* System V.4 uses register 13 as a pointer to the small data area,
    so it is not available to the normal user.  */
-
 #define FIXED_R13 1
 
 /* Size of the V.4 varargs area if needed.  */