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gimple-low.c (lower_gimple_bind): Clear DECL_CHAIN of vars in gimple_bind_vars but not in BLOCK_VARS. 

2016-10-07  Richard Biener  <rguenther@suse.de>

	* gimple-low.c (lower_gimple_bind): Clear DECL_CHAIN of
	vars in gimple_bind_vars but not in BLOCK_VARS.

From-SVN: r240855
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Richard Biener 2016-10-07 07:47:38 +00:00 committed by Richard Biener
parent 4023bc5647
commit 014b59e688
2 changed files with 22 additions and 0 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2016-10-07 Richard Biener <rguenther@suse.de>
* gimple-low.c (lower_gimple_bind): Clear DECL_CHAIN of
vars in gimple_bind_vars but not in BLOCK_VARS.
2016-10-07 Richard Biener <rguenther@suse.de> 2016-10-07 Richard Biener <rguenther@suse.de>
PR tree-optimization/77879 PR tree-optimization/77879

17
gcc/gimple-low.c
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@ -416,6 +416,23 @@ lower_gimple_bind (gimple_stmt_iterator *gsi, struct lower_data *data)
} }
record_vars (gimple_bind_vars (stmt)); record_vars (gimple_bind_vars (stmt));
/* Scrap DECL_CHAIN up to BLOCK_VARS to ease GC after we no longer
need gimple_bind_vars. */
tree next;
tree end = NULL_TREE;
if (gimple_bind_block (stmt))
end = BLOCK_VARS (gimple_bind_block (stmt));
for (tree var = gimple_bind_vars (stmt); var != end; var = next)
{
/* Ugh, something is violating the constraint that BLOCK_VARS
is a sub-chain of gimple_bind_vars. */
if (! var)
break;
next = DECL_CHAIN (var);
DECL_CHAIN (var) = NULL_TREE;
}
lower_sequence (gimple_bind_body_ptr (stmt), data); lower_sequence (gimple_bind_body_ptr (stmt), data);
if (new_block) if (new_block)