diff options
Diffstat (limited to 'gcc/basic-block.h')
| -rw-r--r-- | gcc/basic-block.h | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/gcc/basic-block.h b/gcc/basic-block.h index c2e4a16dd79..8407f3a7e3c 100644 --- a/gcc/basic-block.h +++ b/gcc/basic-block.h @@ -430,12 +430,12 @@ extern bool rediscover_loops_after_threading; /* For iterating over insns in basic block. */ #define FOR_BB_INSNS(BB, INSN) \ for ((INSN) = BB_HEAD (BB); \ - (INSN) != NEXT_INSN (BB_END (BB)); \ + (INSN) && (INSN) != NEXT_INSN (BB_END (BB)); \ (INSN) = NEXT_INSN (INSN)) #define FOR_BB_INSNS_REVERSE(BB, INSN) \ for ((INSN) = BB_END (BB); \ - (INSN) != PREV_INSN (BB_HEAD (BB)); \ + (INSN) && (INSN) != PREV_INSN (BB_HEAD (BB)); \ (INSN) = PREV_INSN (INSN)) /* Cycles through _all_ basic blocks, even the fake ones (entry and @@ -467,11 +467,12 @@ extern bitmap_obstack reg_obstack; #define BB_END(B) (B)->il.rtl->end_ /* Special block numbers [markers] for entry and exit. */ -#define ENTRY_BLOCK (-1) -#define EXIT_BLOCK (-2) +#define ENTRY_BLOCK (0) +#define EXIT_BLOCK (1) + +/* The two blocks that are always in the cfg. */ +#define NUM_FIXED_BLOCKS (2) -/* Special block number not valid for any block. */ -#define INVALID_BLOCK (-3) #define BLOCK_NUM(INSN) (BLOCK_FOR_INSN (INSN)->index + 0) #define set_block_for_insn(INSN, BB) (BLOCK_FOR_INSN (INSN) = BB) |