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Diffstat (limited to 'gcc/tree-ssa-dom.c')
| -rw-r--r-- | gcc/tree-ssa-dom.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index 29d2bb4..d98a646 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -1151,9 +1151,15 @@ record_equivalences_from_incoming_edge (basic_block bb) { tree old_rhs = gimple_assign_rhs1 (defstmt); - /* If the constant is in the range of the type of OLD_RHS, - then convert the constant and record the equivalence. */ + /* If the conversion widens the original value and + the constant is in the range of the type of OLD_RHS, + then convert the constant and record the equivalence. + + Note that int_fits_type_p does not check the precision + if the upper and lower bounds are OK. */ if (INTEGRAL_TYPE_P (TREE_TYPE (old_rhs)) + && (TYPE_PRECISION (TREE_TYPE (lhs)) + > TYPE_PRECISION (TREE_TYPE (old_rhs))) && int_fits_type_p (rhs, TREE_TYPE (old_rhs))) { tree newval = fold_convert (TREE_TYPE (old_rhs), rhs); |