/* Instruction scheduling pass.
Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998,
- 1999, 2000, 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+ 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006
+ Free Software Foundation, Inc.
Contributed by Michael Tiemann (tiemann@cygnus.com) Enhanced by,
and currently maintained by, Jim Wilson (wilson@cygnus.com)
|| !RECOVERY_BLOCK (next)
|| RECOVERY_BLOCK (next) == EXIT_BLOCK_PTR);
- if (*ts == 0 && ORIG_PAT (next) && !RECOVERY_BLOCK (next))
- /* We should change pattern of every previously speculative
- instruction - and we determine if NEXT was speculative by using
- ORIG_PAT field. Except one case - simple checks have ORIG_PAT
- pat too, hence we also check for the RECOVERY_BLOCK. */
- {
- change_pattern (next, ORIG_PAT (next));
- ORIG_PAT (next) = 0;
- }
-
if (*ts & HARD_DEP)
{
/* We can't assert (QUEUE_INDEX (next) == QUEUE_NOWHERE) here because
change_queue_index (next, QUEUE_NOWHERE);
return -1;
}
+ else if (!(*ts & BEGIN_SPEC) && ORIG_PAT (next) && !RECOVERY_BLOCK (next))
+ /* We should change pattern of every previously speculative
+ instruction - and we determine if NEXT was speculative by using
+ ORIG_PAT field. Except one case - simple checks have ORIG_PAT
+ pat too, hence we also check for the RECOVERY_BLOCK. */
+ {
+ change_pattern (next, ORIG_PAT (next));
+ ORIG_PAT (next) = 0;
+ }
if (sched_verbose >= 2)
{
ds = DEP_STATUS (link);
- if (fs && (ds & DEP_TYPES) == DEP_TRUE)
- ds = (ds & ~BEGIN_SPEC) | fs;
+ if (/* If we want to create speculative dep. */
+ fs
+ /* And we can do that because this is a true dep. */
+ && (ds & DEP_TYPES) == DEP_TRUE)
+ {
+ gcc_assert (!(ds & BE_IN_SPEC));
+
+ if (/* If this dep can be overcomed with 'begin speculation'. */
+ ds & BEGIN_SPEC)
+ /* Then we have a choice: keep the dep 'begin speculative'
+ or transform it into 'be in speculative'. */
+ {
+ if (/* In try_ready we assert that if insn once became ready
+ it can be removed from the ready (or queue) list only
+ due to backend decision. Hence we can't let the
+ probability of the speculative dep to decrease. */
+ dep_weak (ds) <= dep_weak (fs))
+ /* Transform it to be in speculative. */
+ ds = (ds & ~BEGIN_SPEC) | fs;
+ }
+ else
+ /* Mark the dep as 'be in speculative'. */
+ ds |= fs;
+ }
add_back_forw_dep (consumer, twin, REG_NOTE_KIND (link), ds);
}