diff options
Diffstat (limited to 'gcc-4.9/gcc/tree-ssa-sccvn.c')
| -rw-r--r-- | gcc-4.9/gcc/tree-ssa-sccvn.c | 89 |
1 files changed, 33 insertions, 56 deletions
diff --git a/gcc-4.9/gcc/tree-ssa-sccvn.c b/gcc-4.9/gcc/tree-ssa-sccvn.c index f7ec8b6d6..5bf4e9289 100644 --- a/gcc-4.9/gcc/tree-ssa-sccvn.c +++ b/gcc-4.9/gcc/tree-ssa-sccvn.c @@ -3074,33 +3074,12 @@ visit_phi (gimple phi) /* If all value numbered to the same value, the phi node has that value. */ if (allsame) - { - if (is_gimple_min_invariant (sameval)) - { - VN_INFO (PHI_RESULT (phi))->has_constants = true; - VN_INFO (PHI_RESULT (phi))->expr = sameval; - } - else - { - VN_INFO (PHI_RESULT (phi))->has_constants = false; - VN_INFO (PHI_RESULT (phi))->expr = sameval; - } - - if (TREE_CODE (sameval) == SSA_NAME) - return visit_copy (PHI_RESULT (phi), sameval); - - return set_ssa_val_to (PHI_RESULT (phi), sameval); - } + return set_ssa_val_to (PHI_RESULT (phi), sameval); /* Otherwise, see if it is equivalent to a phi node in this block. */ result = vn_phi_lookup (phi); if (result) - { - if (TREE_CODE (result) == SSA_NAME) - changed = visit_copy (PHI_RESULT (phi), result); - else - changed = set_ssa_val_to (PHI_RESULT (phi), result); - } + changed = set_ssa_val_to (PHI_RESULT (phi), result); else { vn_phi_insert (phi, PHI_RESULT (phi)); @@ -3214,24 +3193,18 @@ simplify_binary_expression (gimple stmt) catch those with constants. The goal here is to simultaneously combine constants between expressions, but avoid infinite expansion of expressions during simplification. */ - if (TREE_CODE (op0) == SSA_NAME) - { - if (VN_INFO (op0)->has_constants + op0 = vn_valueize (op0); + if (TREE_CODE (op0) == SSA_NAME + && (VN_INFO (op0)->has_constants || TREE_CODE_CLASS (code) == tcc_comparison - || code == COMPLEX_EXPR) - op0 = valueize_expr (vn_get_expr_for (op0)); - else - op0 = vn_valueize (op0); - } + || code == COMPLEX_EXPR)) + op0 = valueize_expr (vn_get_expr_for (op0)); - if (TREE_CODE (op1) == SSA_NAME) - { - if (VN_INFO (op1)->has_constants - || code == COMPLEX_EXPR) - op1 = valueize_expr (vn_get_expr_for (op1)); - else - op1 = vn_valueize (op1); - } + op1 = vn_valueize (op1); + if (TREE_CODE (op1) == SSA_NAME + && (VN_INFO (op1)->has_constants + || code == COMPLEX_EXPR)) + op1 = valueize_expr (vn_get_expr_for (op1)); /* Pointer plus constant can be represented as invariant address. Do so to allow further propatation, see also tree forwprop. */ @@ -3289,24 +3262,28 @@ simplify_unary_expression (gimple stmt) return NULL_TREE; orig_op0 = op0; - if (VN_INFO (op0)->has_constants) - op0 = valueize_expr (vn_get_expr_for (op0)); - else if (CONVERT_EXPR_CODE_P (code) - || code == REALPART_EXPR - || code == IMAGPART_EXPR - || code == VIEW_CONVERT_EXPR - || code == BIT_FIELD_REF) + op0 = vn_valueize (op0); + if (TREE_CODE (op0) == SSA_NAME) { - /* We want to do tree-combining on conversion-like expressions. - Make sure we feed only SSA_NAMEs or constants to fold though. */ - tree tem = valueize_expr (vn_get_expr_for (op0)); - if (UNARY_CLASS_P (tem) - || BINARY_CLASS_P (tem) - || TREE_CODE (tem) == VIEW_CONVERT_EXPR - || TREE_CODE (tem) == SSA_NAME - || TREE_CODE (tem) == CONSTRUCTOR - || is_gimple_min_invariant (tem)) - op0 = tem; + if (VN_INFO (op0)->has_constants) + op0 = valueize_expr (vn_get_expr_for (op0)); + else if (CONVERT_EXPR_CODE_P (code) + || code == REALPART_EXPR + || code == IMAGPART_EXPR + || code == VIEW_CONVERT_EXPR + || code == BIT_FIELD_REF) + { + /* We want to do tree-combining on conversion-like expressions. + Make sure we feed only SSA_NAMEs or constants to fold though. */ + tree tem = valueize_expr (vn_get_expr_for (op0)); + if (UNARY_CLASS_P (tem) + || BINARY_CLASS_P (tem) + || TREE_CODE (tem) == VIEW_CONVERT_EXPR + || TREE_CODE (tem) == SSA_NAME + || TREE_CODE (tem) == CONSTRUCTOR + || is_gimple_min_invariant (tem)) + op0 = tem; + } } /* Avoid folding if nothing changed, but remember the expression. */ |