The recent r178104 change to tree-ssa-loop-ivopts.c broke bootstrap on
i686-linux
because stage2 gcc considers the variable 'comp' used but possibly
uninitialized,
see PR50218. Initializing it to ERROR_MARK solves the problem, and is
consistent
with how other parts of r178104 represent absent/impossible 'comp' values.
Ok for trunk? (I don't have svn write access.)
/Mikael
gcc/
2011-08-20 Mikael Pettersson <mi...@it.uu.se>
PR bootstrap/50218
* tree-ssa-loop-ivopts.c (determine_use_iv_cost_condition): Initialize
comp.
--- gcc-4.7-20110827/gcc/tree-ssa-loop-ivopts.c.~1~ 2011-08-26
15:36:28.000000000 +0200
+++ gcc-4.7-20110827/gcc/tree-ssa-loop-ivopts.c 2011-08-28 10:13:34.000000000
+0200
@@ -4757,7 +4757,7 @@ determine_use_iv_cost_condition (struct
bool ok;
int elim_inv_expr_id = -1, express_inv_expr_id = -1, inv_expr_id;
tree *control_var, *bound_cst;
- enum tree_code comp;
+ enum tree_code comp = ERROR_MARK;
/* Only consider real candidates. */
if (!cand->iv)
