OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[multiple changes]

Browse Source 
1998-10-18 Herman A.J. ten Brugge <Haj.Ten.Brugge@net.HCC.nl>
        * reorg.c (steal_delay_list_from_target) Check for insns that
        modify the condition codes and effect the direction of the jump
        in the sequence.
Sat Oct 17 13:09:09 1998  Graham  <grahams@rcp.co.uk>
        * function.c (purge_addressof_1): Replace call to
        emit_insns_before() with emit_insn_before().

From-SVN: r23189
This commit is contained in:
Jeff Law 1998-10-19 14:23:44 -06:00
parent ea4d3ff6e0
commit 18e765cbda
3 changed files with 35 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
gcc/ChangeLog
View File

@ -1,3 +1,14 @@
1998-10-18 Herman A.J. ten Brugge <Haj.Ten.Brugge@net.HCC.nl>
* reorg.c (steal_delay_list_from_target) Check for insns that
modify the condition codes and effect the direction of the jump
in the sequence.
Sat Oct 17 13:09:09 1998 Graham <grahams@rcp.co.uk>
* function.c (purge_addressof_1): Replace call to
emit_insns_before() with emit_insn_before().
Mon Oct 19 19:34:03 1998 Mike Stump <mrs@wrs.com>
* libgcc2.c (__pure_virtual): Call __terminate instead of _exit.

2
gcc/function.c
View File

@ -2860,7 +2860,7 @@ purge_addressof_1 (loc, insn, force, store)
insns = gen_sequence ();
end_sequence ();
emit_insns_before (insns, insn);
emit_insn_before (insns, insn);
return;
}
else if (code == MEM && GET_CODE (XEXP (x, 0)) == ADDRESSOF && ! force)

29
gcc/reorg.c
View File

@ -61,6 +61,10 @@ Boston, MA 02111-1307, USA. */
we can hoist insns from the fall-through path for forward branches or
steal insns from the target of backward branches.
The TMS320C3x and C4x have three branch delay slots. When the three
slots are filled, the branch penalty is zero. Most insns can fill the
delay slots except jump insns.
Three techniques for filling delay slots have been implemented so far:
(1) `fill_simple_delay_slots' is the simplest, most efficient way
@ -1687,6 +1691,7 @@ steal_delay_list_from_target (insn, condition, seq, delay_list,
int must_annul = *pannul_p;
int i;
int used_annul = 0;
struct resources cc_set;
/* We can't do anything if there are more delay slots in SEQ than we
can handle, or if we don't know that it will be a taken branch.
@ -1696,7 +1701,23 @@ steal_delay_list_from_target (insn, condition, seq, delay_list,
Also, exit if the branch has more than one set, since then it is computing
other results that can't be ignored, e.g. the HPPA mov&branch instruction.
??? It may be possible to move other sets into INSN in addition to
moving the instructions in the delay slots. */
moving the instructions in the delay slots.
We can not steal the delay list if one of the instructions in the
current delay_list modifies the condition codes and the jump in the
sequence is a conditional jump. We can not do this because we can
not change the direction of the jump because the condition codes
will effect the direction of the jump in the sequence. */
CLEAR_RESOURCE (&cc_set);
for (temp = delay_list; temp; temp = XEXP (temp, 1))
{
rtx trial = XEXP (temp, 0);
mark_set_resources (trial, &cc_set, 0, 1);
if (insn_references_resource_p (XVECEXP (seq , 0, 0), &cc_set, 0))
return delay_list;
}
if (XVECLEN (seq, 0) - 1 > slots_remaining
|| ! condition_dominates_p (condition, XVECEXP (seq, 0, 0))
@ -3716,8 +3737,6 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
delay_list = add_to_delay_list (temp, delay_list);
mark_set_resources (trial, &opposite_needed, 0, 1);
if (slots_to_fill == ++(*pslots_filled))
{
/* Even though we have filled all the slots, we
@ -3795,9 +3814,7 @@ fill_slots_from_thread (insn, condition, thread, opposite_thread, likely,
{
/* If this is the `true' thread, we will want to follow the jump,
so we can only do this if we have taken everything up to here. */
if (thread_if_true && trial == new_thread
&& ! insn_references_resource_p (XVECEXP (PATTERN (trial), 0, 0),
&opposite_needed, 0))
if (thread_if_true && trial == new_thread)
delay_list
= steal_delay_list_from_target (insn, condition, PATTERN (trial),
delay_list, &set, &needed,