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ia64.c (group_barrier_needed_p): Don't allow calls and jumps to be bundled together.

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* config/ia64/ia64.c (group_barrier_needed_p): Don't allow
        calls and jumps to be bundled together.
        (ia64_reorg): Emit a break after a noreturn call that ends
        a function.
        * config/ia64/ia64.md (break_f): New.

From-SVN: r41979
This commit is contained in:
Richard Henderson 2001-05-11 22:21:09 -07:00 committed by Richard Henderson
parent c8a9607017
commit f12f25a7f6
3 changed files with 58 additions and 0 deletions
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8
gcc/ChangeLog
View File

@ -1,3 +1,11 @@
2001-05-11 Richard Henderson <rth@redhat.com>
* config/ia64/ia64.c (group_barrier_needed_p): Don't allow
calls and jumps to be bundled together.
(ia64_reorg): Emit a break after a noreturn call that ends
a function.
* config/ia64/ia64.md (break_f): New.
2001-05-12 Neil Booth <neil@daikokuya.demon.co.uk>
* c-lex.c (lex_charconst): Convert into a simple wrapper

44
gcc/config/ia64/ia64.c
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@ -4509,11 +4509,28 @@ group_barrier_needed_p (insn)
flags.is_branch = 1;
flags.is_sibcall = SIBLING_CALL_P (insn);
memset (rws_insn, 0, sizeof (rws_insn));
/* Don't bundle a call following another call. */
if ((pat = prev_active_insn (insn))
&& GET_CODE (pat) == CALL_INSN)
{
need_barrier = 1;
break;
}
need_barrier = rtx_needs_barrier (PATTERN (insn), flags, 0);
break;
case JUMP_INSN:
flags.is_branch = 1;
/* Don't bundle a jump following a call. */
if ((pat = prev_active_insn (insn))
&& GET_CODE (pat) == CALL_INSN)
{
need_barrier = 1;
break;
}
/* FALLTHRU */
case INSN:
@ -6411,6 +6428,33 @@ ia64_reorg (insns)
else
emit_all_insn_group_barriers (rtl_dump_file, insns);
/* A call must not be the last instruction in a function, so that the
return address is still within the function, so that unwinding works
properly. Note that IA-64 differs from dwarf2 on this point. */
if (flag_unwind_tables || (flag_exceptions && !USING_SJLJ_EXCEPTIONS))
{
rtx insn;
int saw_stop = 0;
insn = get_last_insn ();
if (! INSN_P (insn))
insn = prev_active_insn (insn);
if (GET_CODE (insn) == INSN
&& GET_CODE (PATTERN (insn)) == UNSPEC_VOLATILE
&& XINT (PATTERN (insn), 1) == 2)
{
saw_stop = 1;
insn = prev_active_insn (insn);
}
if (GET_CODE (insn) == CALL_INSN)
{
if (! saw_stop)
emit_insn (gen_insn_group_barrier (GEN_INT (3)));
emit_insn (gen_break_f ());
emit_insn (gen_insn_group_barrier (GEN_INT (3)));
}
}
fixup_errata ();
emit_predicate_relation_info ();
}

6
gcc/config/ia64/ia64.md
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@ -71,6 +71,7 @@
;; 0 alloc
;; 1 blockage
;; 2 insn_group_barrier
;; 3 break
;; 5 set_bsp
;; 8 pred.safe_across_calls all
;; 9 pred.safe_across_calls normal
@ -4940,6 +4941,11 @@
[(set_attr "itanium_class" "stop_bit")
(set_attr "predicable" "no")])
(define_insn "break_f"
[(unspec_volatile [(const_int 0)] 3)]
""
"break.f 0"
[(set_attr "itanium_class" "nop_f")])
;; Non-local goto support.