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| author | Jeff Law <law@redhat.com> | 2013-03-25 13:05:57 -0600 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2013-03-25 13:05:57 -0600 |
| commit | 39e45653572c760e4d12d08d859615a1da9b1d81 (patch) | |
| tree | badb3924bcf639adf7313e2d437082f425cefaed /gcc/tree-ssa-dom.c | |
| parent | 85d8c21edbcdf3915c6bd0d72429329ef760ff2b (diff) | |
| download | gcc-39e45653572c760e4d12d08d859615a1da9b1d81.zip gcc-39e45653572c760e4d12d08d859615a1da9b1d81.tar.gz gcc-39e45653572c760e4d12d08d859615a1da9b1d81.tar.bz2 | |
tree-ssa-dom.c (record_equivalences_from_incoming_edge): Rework slightly to avoid creating and folding useless trees.
* tree-ssa-dom.c (record_equivalences_from_incoming_edge): Rework
slightly to avoid creating and folding useless trees. Simplify
slightly by restricting to INTEGER_CSTs and using int_fits_type_p.
From-SVN: r197060
Diffstat (limited to 'gcc/tree-ssa-dom.c')
| -rw-r--r-- | gcc/tree-ssa-dom.c | 25 |
1 files changed, 12 insertions, 13 deletions
diff --git a/gcc/tree-ssa-dom.c b/gcc/tree-ssa-dom.c index 57b814c..a71c6dc 100644 --- a/gcc/tree-ssa-dom.c +++ b/gcc/tree-ssa-dom.c @@ -1135,12 +1135,13 @@ record_equivalences_from_incoming_edge (basic_block bb) if (lhs) record_equality (lhs, rhs); - /* If LHS is an SSA_NAME and RHS is a constant and LHS was set - via a widening type conversion, then we may be able to record + /* If LHS is an SSA_NAME and RHS is a constant integer and LHS was + set via a widening type conversion, then we may be able to record additional equivalences. */ if (lhs && TREE_CODE (lhs) == SSA_NAME - && is_gimple_constant (rhs)) + && is_gimple_constant (rhs) + && TREE_CODE (rhs) == INTEGER_CST) { gimple defstmt = SSA_NAME_DEF_STMT (lhs); @@ -1149,16 +1150,14 @@ record_equivalences_from_incoming_edge (basic_block bb) && CONVERT_EXPR_CODE_P (gimple_assign_rhs_code (defstmt))) { tree old_rhs = gimple_assign_rhs1 (defstmt); - tree newval = fold_convert (TREE_TYPE (old_rhs), rhs); - - /* If this was a widening conversion and if RHS is converted - to the type of OLD_RHS and has the same value, then we - can record an equivalence between OLD_RHS and the - converted representation of RHS. */ - if ((TYPE_PRECISION (TREE_TYPE (lhs)) - > TYPE_PRECISION (TREE_TYPE (old_rhs))) - && operand_equal_p (rhs, newval, 0)) - record_equality (old_rhs, newval); + + /* If the constant is in the range of the type of OLD_RHS, + then convert the constant and record the equivalence. */ + if (int_fits_type_p (rhs, TREE_TYPE (old_rhs))) + { + tree newval = fold_convert (TREE_TYPE (old_rhs), rhs); + record_equality (old_rhs, newval); + } } } |