* basic-block.h (CLEANUP_NO_INSN_DEL): Define it.
* cfgcleanup.c (cleanup_cfg): If it is set do not
attempt to delete trivially dead insns.
* except.c (finish_eh_generation): Pass it to cleanup_cfg.
* toplev.c (rest_of_compilation): Document non-trivial aspect
the RTL before optimize_save_area_alloca is run.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@53789
138bc75d-0d04-0410-961f-
82ee72b054a4
+2002-05-23 David S. Miller <davem@redhat.com>
+
+ * basic-block.h (CLEANUP_NO_INSN_DEL): Define it.
+ * cfgcleanup.c (cleanup_cfg): If it is set do not
+ attempt to delete trivially dead insns.
+ * except.c (finish_eh_generation): Pass it to cleanup_cfg.
+ * toplev.c (rest_of_compilation): Document non-trivial aspect
+ the RTL before optimize_save_area_alloca is run.
+
2002-05-23 Neil Booth <neil@daikokuya.demon.co.uk>
* c-lex.c (indent_level): Remove.
notes. */
#define CLEANUP_UPDATE_LIFE 32 /* Keep life information up to date. */
#define CLEANUP_THREADING 64 /* Do jump threading. */
+#define CLEANUP_NO_INSN_DEL 128 /* Do not try to delete trivially dead
+ insns. */
/* Flags for loop discovery. */
#define LOOP_TREE 1 /* Build loop hierarchy tree. */
changed = true;
/* We've possibly created trivially dead code. Cleanup it right
now to introduce more oppurtunities for try_optimize_cfg. */
- if (!(mode & (CLEANUP_UPDATE_LIFE | CLEANUP_PRE_SIBCALL))
+ if (!(mode & (CLEANUP_NO_INSN_DEL
+ | CLEANUP_UPDATE_LIFE | CLEANUP_PRE_SIBCALL))
&& !reload_completed)
delete_trivially_dead_insns (get_insns(), max_reg_num ());
}
| PROP_LOG_LINKS))
break;
}
- else if (!(mode & CLEANUP_PRE_SIBCALL) && !reload_completed)
+ else if (!(mode & (CLEANUP_NO_INSN_DEL | CLEANUP_PRE_SIBCALL))
+ && !reload_completed)
{
if (!delete_trivially_dead_insns (get_insns(), max_reg_num ()))
break;
rebuild_jump_labels (get_insns ());
find_basic_blocks (get_insns (), max_reg_num (), 0);
- cleanup_cfg (CLEANUP_PRE_LOOP);
+ cleanup_cfg (CLEANUP_PRE_LOOP | CLEANUP_NO_INSN_DEL);
/* These registers are used by the landing pads. Make sure they
have been generated. */
find_exception_handler_labels ();
rebuild_jump_labels (get_insns ());
find_basic_blocks (get_insns (), max_reg_num (), 0);
- cleanup_cfg (CLEANUP_PRE_LOOP);
+ cleanup_cfg (CLEANUP_PRE_LOOP | CLEANUP_NO_INSN_DEL);
}
\f
static hashval_t
unshare_all_rtl (current_function_decl, insns);
#ifdef SETJMP_VIA_SAVE_AREA
- /* This must be performed before virtual register instantiation. */
+ /* This must be performed before virtual register instantiation.
+ Please be aware the everything in the compiler that can look
+ at the RTL up to this point must understand that REG_SAVE_AREA
+ is just like a use of the REG contained inside. */
if (current_function_calls_alloca)
optimize_save_area_alloca (insns);
#endif