diff options
Diffstat (limited to 'gcc/gimple-lower-bitint.cc')
| -rw-r--r-- | gcc/gimple-lower-bitint.cc | 26 |
1 files changed, 22 insertions, 4 deletions
diff --git a/gcc/gimple-lower-bitint.cc b/gcc/gimple-lower-bitint.cc index c52a657..6fefc83 100644 --- a/gcc/gimple-lower-bitint.cc +++ b/gcc/gimple-lower-bitint.cc @@ -6647,10 +6647,28 @@ gimple_lower_bitint (void) bitmap_set_bit (large_huge.m_names, SSA_NAME_VERSION (s)); if (has_single_use (s)) { - if (!large_huge.m_single_use_names) - large_huge.m_single_use_names = BITMAP_ALLOC (NULL); - bitmap_set_bit (large_huge.m_single_use_names, - SSA_NAME_VERSION (s)); + tree s2 = s; + /* The coalescing hook special cases SSA_NAME copies. + Make sure not to mark in m_single_use_names single + use SSA_NAMEs copied from non-single use SSA_NAMEs. */ + while (gimple_assign_copy_p (SSA_NAME_DEF_STMT (s2))) + { + s2 = gimple_assign_rhs1 (SSA_NAME_DEF_STMT (s2)); + if (TREE_CODE (s2) != SSA_NAME) + break; + if (!has_single_use (s2)) + { + s2 = NULL_TREE; + break; + } + } + if (s2) + { + if (!large_huge.m_single_use_names) + large_huge.m_single_use_names = BITMAP_ALLOC (NULL); + bitmap_set_bit (large_huge.m_single_use_names, + SSA_NAME_VERSION (s)); + } } if (SSA_NAME_VAR (s) && ((TREE_CODE (SSA_NAME_VAR (s)) == PARM_DECL |