arm.h (CONDITIONAL_REGISTER_USAGE): Disable use of LR in Thumb code.

* arm.h (CONDITIONAL_REGISTER_USAGE): Disable use of LR in Thumb
code.

From-SVN: r73157

gcc/ChangeLog

+2003-10-31  Richard Earnshaw  <rearnsha@arm.com>
+
+	* arm.h (CONDITIONAL_REGISTER_USAGE): Disable use of LR in Thumb
+	code.
+
 2003-10-31  Andreas Jaeger  <aj@suse.de>, 
             Zack Weinberg  <zack@codesourcery.com>            
 

gcc/config/arm/arm.h

@@ -959,6 +959,12 @@ extern const char * structure_size_string;
 	fixed_regs[regno] = call_used_regs[regno] = 1;		\
     }								\
 								\
+  /* The link register can be clobbered by any branch insn,	\
+     but we have no way to track that at present, so mark	\
+     it as unavailable.  */					\
+  if (TARGET_THUMB)						\
+    fixed_regs[LR_REGNUM] = call_used_regs[LR_REGNUM] = 1;	\
+								\
   if (TARGET_CIRRUS)						\
     {								\
       for (regno = FIRST_ARM_FP_REGNUM;				\