diff options
Diffstat (limited to 'gcc/predict.c')
| -rw-r--r-- | gcc/predict.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/predict.c b/gcc/predict.c index 01f5cfc..66a88ab 100644 --- a/gcc/predict.c +++ b/gcc/predict.c @@ -2134,6 +2134,25 @@ expr_expected_value_1 (tree type, tree op0, enum tree_code code, if (TREE_CONSTANT (op0)) return op0; + if (code == IMAGPART_EXPR) + { + if (TREE_CODE (TREE_OPERAND (op0, 0)) == SSA_NAME) + { + def = SSA_NAME_DEF_STMT (TREE_OPERAND (op0, 0)); + if (is_gimple_call (def) + && gimple_call_internal_p (def) + && (gimple_call_internal_fn (def) + == IFN_ATOMIC_COMPARE_EXCHANGE)) + { + /* Assume that any given atomic operation has low contention, + and thus the compare-and-swap operation succeeds. */ + if (predictor) + *predictor = PRED_COMPARE_AND_SWAP; + return build_one_cst (TREE_TYPE (op0)); + } + } + } + if (code != SSA_NAME) return NULL_TREE; |