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regmove.c (perhaps_ends_bb_p): Use can_throw_internal to reduce false positives.

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* regmove.c (perhaps_ends_bb_p): Use can_throw_internal to
        reduce false positives.
        (regmove_optimize): Disable if flag_non_call_exceptions.

From-SVN: r40917
This commit is contained in:
Richard Henderson 2001-03-28 00:08:43 -08:00 committed by Richard Henderson
parent 7cc8342c77
commit a614d82edd
2 changed files with 13 additions and 4 deletions
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4
gcc/ChangeLog
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@ -1,5 +1,9 @@
2001-03-27 Richard Henderson <rth@redhat.com>
* regmove.c (perhaps_ends_bb_p): Use can_throw_internal to
reduce false positives.
(regmove_optimize): Disable if flag_non_call_exceptions.
* stmt.c (expand_return): Remove always true predicate.
(expand_decl_cleanup_no_eh): Remove dead code.

13
gcc/regmove.c
View File

@ -395,11 +395,11 @@ static int perhaps_ends_bb_p (insn)
/* A CALL_INSN might be the last insn of a basic block, if it is inside
an EH region or if there are nonlocal gotos. Note that this test is
very conservative. */
return flag_exceptions || nonlocal_goto_handler_labels;
if (nonlocal_goto_handler_labels)
return 1;
/* FALLTHRU */
default:
/* All others never end a basic block. */
return 0;
return can_throw_internal (insn);
}
}
@ -1062,6 +1062,11 @@ regmove_optimize (f, nregs, regmove_dump_file)
int i;
rtx copy_src, copy_dst;
/* ??? Hack. Regmove doesn't examine the CFG, and gets mightily
confused by non-call exceptions ending blocks. */
if (flag_non_call_exceptions)
return;
/* Find out where a potential flags register is live, and so that we
can supress some optimizations in those zones. */
mark_flags_life_zones (discover_flags_reg ());