diff options
Diffstat (limited to 'gcc/jump.c')
| -rw-r--r-- | gcc/jump.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/gcc/jump.c b/gcc/jump.c index 4ffeeff3f21..9a031937dd2 100644 --- a/gcc/jump.c +++ b/gcc/jump.c @@ -126,9 +126,33 @@ static void delete_from_jump_chain PROTO((rtx)); static int delete_labelref_insn PROTO((rtx, rtx, int)); static void mark_modified_reg PROTO((rtx, rtx)); static void redirect_tablejump PROTO((rtx, rtx)); +static void jump_optimize_1 PROTO ((rtx, int, int, int, int)); #ifndef HAVE_cc0 static rtx find_insert_position PROTO((rtx, rtx)); #endif + +/* Main external entry point into the jump optimizer. See comments before + jump_optimize_1 for descriptions of the arguments. */ +void +jump_optimize (f, cross_jump, noop_moves, after_regscan) + rtx f; + int cross_jump; + int noop_moves; + int after_regscan; +{ + jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, 0); +} + +/* Alternate entry into the jump optimizer. This entry point only rebuilds + the JUMP_LABEL field in jumping insns and REG_LABEL notes in non-jumping + instructions. */ +void +rebuild_jump_labels (f) + rtx f; +{ + jump_optimize_1 (f, 0, 0, 0, 1); +} + /* Delete no-op jumps and optimize jumps to jumps and jumps around jumps. @@ -143,6 +167,9 @@ static rtx find_insert_position PROTO((rtx, rtx)); If AFTER_REGSCAN is nonzero, then this jump pass is being run immediately after regscan, and it is safe to use regno_first_uid and regno_last_uid. + If MARK_LABELS_ONLY is nonzero, then we only rebuild the jump chain + and JUMP_LABEL field for jumping insns. + If `optimize' is zero, don't change any code, just determine whether control drops off the end of the function. This case occurs when we have -W and not -O. @@ -150,11 +177,12 @@ static rtx find_insert_position PROTO((rtx, rtx)); and refrains from actually deleting when that is 0. */ void -jump_optimize (f, cross_jump, noop_moves, after_regscan) +jump_optimize_1 (f, cross_jump, noop_moves, after_regscan, mark_labels_only) rtx f; int cross_jump; int noop_moves; int after_regscan; + int mark_labels_only; { register rtx insn, next; int changed; @@ -182,6 +210,11 @@ jump_optimize (f, cross_jump, noop_moves, after_regscan) mark_all_labels (f, cross_jump); + /* Quit now if we just wanted to rebuild the JUMP_LABEL and REG_LABEL + notes. */ + if (mark_labels_only) + return; + /* Keep track of labels used from static data; they cannot ever be deleted. */ |