new register allocator and HARD_REGNO_CALL_PART_CLOBBERED

[Herman ten Brugge]

Hello,

I found a problem with the -fnew-ra option of the compiler. I analysed
the problem and found that the macro HARD_REGNO_CALL_PART_CLOBBERED
is not used by the new register allocator.
I think this is also a bit difficult to implement because we now
have to check the mode for every register that is used during a CALL_INSN.
I currently made a local patch for the c4x target that seems to bypass
the problem. I simply make the effected registers call_used so they
can not be used accross a call. This is less optimal for the c4x
target but is works. The sh target is the only other target that
is using HARD_REGNO_CALL_PART_CLOBBERED at the moment. A simular
patch is also possible for that target.
Can some one with more understanding of the new register allocator
have a look at this problem.

	Herman.


--- c4x.h	2003-04-30 21:06:40.000000000 +0200
+++ c4x.h.new	2003-04-30 21:07:55.000000000 +0200
@@ -571,12 +573,23 @@ extern const char *c4x_rpts_cycles_strin
 
 #define CONDITIONAL_REGISTER_USAGE			\
   {							\
+    extern int flag_new_regalloc;			\
     if (! TARGET_BK)					\
       {							\
 	fixed_regs[BK_REGNO] = 1;			\
         call_used_regs[BK_REGNO] = 1;			\
         c4x_regclass_map[BK_REGNO] = NO_REGS;		\
       }							\
+    /* HACK. HARD_REGNO_CALL_PART_CLOBBERED should be	\
+	     checked in the new regalloc pass!  */ 	\
+    if (flag_new_regalloc)				\
+      {							\
+	call_used_regs[R4_REGNO] = 1;			\
+	call_used_regs[R5_REGNO] = 1;			\
+	call_used_regs[R6_REGNO] = 1;			\
+	call_used_regs[R7_REGNO] = 1;			\
+	call_used_regs[R8_REGNO] = 1;			\
+      }							\
     if (TARGET_C3X)					\
       {							\
 	 int i;                                          \