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re PR tree-optimization/17749 (ICE with recursive function)

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PR tree-optimization/17749
	* tree-tailcall.c (find_tail_calls): Check that parameter is
	a gimple_reg.

From-SVN: r88689
This commit is contained in:
Zdenek Dvorak 2004-10-07 16:21:15 +02:00 committed by Zdenek Dvorak
parent ca05904340
commit 14de86fa0a
2 changed files with 23 additions and 5 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2004-10-07 Zdenek Dvorak <dvorakz@suse.cz>
PR tree-optimization/17749
* tree-tailcall.c (find_tail_calls): Check that parameter is
a gimple_reg.
2004-10-07 Kazu Hirata <kazu@cs.umass.edu>
* config/ia64/ia64.c: Fix a comment typo.

22
gcc/tree-tailcall.c
View File

@ -431,15 +431,27 @@ find_tail_calls (basic_block bb, struct tailcall **ret)
param = TREE_CHAIN (param), args = TREE_CHAIN (args))
{
tree arg = TREE_VALUE (args);
if (param != arg
/* Make sure there are no problems with copying. Note we must
if (param != arg)
{
/* Make sure there are no problems with copying. The parameter
have a copyable type and the two arguments must have reasonably
equivalent types. The latter requirement could be relaxed if
we emitted a suitable type conversion statement. */
&& (!is_gimple_reg_type (TREE_TYPE (param))
if (!is_gimple_reg_type (TREE_TYPE (param))
|| !lang_hooks.types_compatible_p (TREE_TYPE (param),
TREE_TYPE (arg))))
break;
TREE_TYPE (arg)))
break;
/* The parameter should be a real operand, so that phi node
created for it at the start of the function has the meaning
of copying the value. This test implies is_gimple_reg_type
from the previous condition, however this one could be
relaxed by being more careful with copying the new value
of the parameter (emitting appropriate MODIFY_EXPR and
updating the virtual operands). */
if (!is_gimple_reg (param))
break;
}
}
if (!args && !param)
tail_recursion = true;