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(copy_loop_body): When check for shared address givs, use new same_insn field. 

(copy_loop_body): When check for shared address givs, use
new same_insn field.
(find_splittable_givs): New variable v2.  Scan givs to set new
same_insn field.  Use same_insn to indentify address givs to be
shared.

From-SVN: r8786
This commit is contained in:
Jim Wilson 1995-01-20 18:12:01 -08:00
parent f415f7bed7
commit 3fc347fa0d
1 changed files with 14 additions and 8 deletions
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22
gcc/unroll.c
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@ -1547,8 +1547,7 @@ copy_loop_body (copy_start, copy_end, map, exit_label, last_iteration,
/* Check for shared address givs, and avoid
incrementing the shared psuedo reg more than
once. */
if (! (tv != v && tv->insn == v->insn
&& tv->new_reg == v->new_reg))
if (! tv->same_insn)
{
/* tv->dest_reg may actually be a (PLUS (REG)
(CONST)) here, so we must call plus_constant
@ -2449,11 +2448,19 @@ find_splittable_givs (bl, unroll_type, loop_start, loop_end, increment,
rtx increment;
int unroll_number;
{
struct induction *v;
struct induction *v, *v2;
rtx final_value;
rtx tem;
int result = 0;
/* Scan the list of givs, and set the same_insn field when there are
multiple identical givs in the same insn. */
for (v = bl->giv; v; v = v->next_iv)
for (v2 = v->next_iv; v2; v2 = v2->next_iv)
if (v->insn == v2->insn && rtx_equal_p (v->new_reg, v2->new_reg)
&& ! v2->same_insn)
v2->same_insn = v;
for (v = bl->giv; v; v = v->next_iv)
{
rtx giv_inc, value;
@ -2629,14 +2636,13 @@ find_splittable_givs (bl, unroll_type, loop_start, loop_end, increment,
v->const_adjust = 0;
if (v->same && v->same->insn == v->insn
&& v->new_reg == v->same->new_reg)
if (v->same_insn)
{
v->dest_reg = v->same->dest_reg;
v->dest_reg = v->same_insn->dest_reg;
if (loop_dump_stream)
fprintf (loop_dump_stream,
"Sharing address givs with reg %d\n",
REGNO (v->dest_reg));
"Sharing address givs in insn %d\n",
INSN_UID (v->insn));
}
else if (unroll_type != UNROLL_COMPLETELY)
{