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genrecog.c (nodes_identical): Expand commentary.

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* genrecog.c (nodes_identical): Expand commentary.
        (write_switch): Watch out for identical nodes.

From-SVN: r38989
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Richard Henderson 2001-01-13 11:31:07 -08:00 • committed by Richard Henderson
parent fabfd8029d
commit 2cec75a1bd
2 changed files with 20 additions and 3 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2001-01-13 Richard Henderson <rth@redhat.com>
* genrecog.c (nodes_identical): Expand commentary.
(write_switch): Watch out for identical nodes.
2001-01-13 Neil Booth <neil@daikokuya.demon.co.uk>
* cppfiles.c (_cpp_fake_include): New function.

18
gcc/genrecog.c
View file

@ -1297,7 +1297,9 @@ nodes_identical (d1, d2)
return 0;
/* Check that their subnodes are at the same position, as any one set
of sibling decisions must be at the same position. */
of sibling decisions must be at the same position. Allowing this
requires complications to find_afterward and when change_state is
invoked. */
if (d1->success.first
&& d2->success.first
&& strcmp (d1->success.first->position, d2->success.first->position))
@ -1743,7 +1745,8 @@ write_switch (start, depth)
if (!p->next
|| p->tests->next
|| p->next->tests->type != type
|| p->next->tests->next)
|| p->next->tests->next
|| nodes_identical_1 (p->tests, p->next->tests))
return p;
/* DT_code is special in that we can do interesting things with
@ -1866,6 +1869,14 @@ write_switch (start, depth)
do
{
/* Merge trees will not unify identical nodes if their
sub-nodes are at different levels. Thus we must check
for duplicate cases. */
struct decision *q;
for (q = start; q != p; q = q->next)
if (nodes_identical_1 (p->tests, q->tests))
goto case_done;
if (p != start && p->need_label && needs_label == NULL)
needs_label = p;
@ -1892,7 +1903,8 @@ write_switch (start, depth)
p = p->next;
}
while (p && p->tests->type == type && !p->tests->next);
case_done:
printf (" default:\n break;\n }\n");
return needs_label != NULL ? needs_label : p;