diff options
Diffstat (limited to 'gcc-4.8/gcc/tree-ssa-math-opts.c')
| -rw-r--r-- | gcc-4.8/gcc/tree-ssa-math-opts.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/gcc-4.8/gcc/tree-ssa-math-opts.c b/gcc-4.8/gcc/tree-ssa-math-opts.c index 2140ced49..508a240bf 100644 --- a/gcc-4.8/gcc/tree-ssa-math-opts.c +++ b/gcc-4.8/gcc/tree-ssa-math-opts.c @@ -1718,7 +1718,9 @@ find_bswap_1 (gimple stmt, struct symbolic_number *n, int limit) if (rhs_class == GIMPLE_BINARY_RHS) { + int i; struct symbolic_number n1, n2; + unsigned HOST_WIDEST_INT mask; tree source_expr2; if (code != BIT_IOR_EXPR) @@ -1744,6 +1746,15 @@ find_bswap_1 (gimple stmt, struct symbolic_number *n, int limit) return NULL_TREE; n->size = n1.size; + for (i = 0, mask = 0xff; i < n->size; i++, mask <<= BITS_PER_UNIT) + { + unsigned HOST_WIDEST_INT masked1, masked2; + + masked1 = n1.n & mask; + masked2 = n2.n & mask; + if (masked1 && masked2 && masked1 != masked2) + return NULL_TREE; + } n->n = n1.n | n2.n; if (!verify_symbolic_number_p (n, stmt)) |