Often the whole CFG does not need to be analyzed, for example,
when optimising a loop, only certain registers are of interest.
Perhaps there should be a bitmap argument to df_analyse to specify
-which registers should be analyzed?
+which registers should be analyzed?
NOTES:
Embedded addressing side-effects, such as POST_INC or PRE_INC, generate
-both a use and a def. These are both marked read/write to show that they
+both a use and a def. These are both marked read/write to show that they
are dependent. For example, (set (reg 40) (mem (post_inc (reg 42))))
-will generate a use of reg 42 followed by a def of reg 42 (both marked
-read/write). Similarly, (set (reg 40) (mem (pre_dec (reg 41))))
+will generate a use of reg 42 followed by a def of reg 42 (both marked
+read/write). Similarly, (set (reg 40) (mem (pre_dec (reg 41))))
generates a use of reg 41 then a def of reg 41 (both marked read/write),
even though reg 41 is decremented before it is used for the memory
address in this second example.
static void df_chain_dump PARAMS((struct df_link *, FILE *file));
static void df_chain_dump_regno PARAMS((struct df_link *, FILE *file));
static void df_regno_debug PARAMS ((struct df *, unsigned int, FILE *));
-static void df_regno_rtl_debug PARAMS ((struct df *, unsigned int, FILE *));
static void df_ref_debug PARAMS ((struct df *, struct ref *, FILE *));
static void df_rd_transfer_function PARAMS ((int, int *, bitmap, bitmap,
bitmap, bitmap, void *));