implemented EXPR_BINARY_BUILTIN_EXPECT to firm

[r18638]

diff --git a/ast2firm.c b/ast2firm.c
index a452d0b..ca6ae77 100644 (file)
--- a/ast2firm.c
+++ b/ast2firm.c
@@ -2295,6 +2295,19 @@ static void create_condition_evaluation(const expression_t *expression,
        ir_node  *true_proj  = new_d_Proj(dbgi, cond, mode_X, pn_Cond_true);
        ir_node  *false_proj = new_d_Proj(dbgi, cond, mode_X, pn_Cond_false);
 
+       /* set branch prediction info based on __builtin_expect */
+       if(expression->kind == EXPR_BINARY_BUILTIN_EXPECT) {
+               long               cnst = fold_constant(expression->binary.right);
+               cond_jmp_predicate pred;
+
+               if(cnst == 0) {
+                       pred = COND_JMP_PRED_FALSE;
+               } else {
+                       pred = COND_JMP_PRED_TRUE;
+               }
+               set_Cond_jmp_pred(cond, pred);
+       }
+
        add_immBlock_pred(true_block, true_proj);
        add_immBlock_pred(false_block, false_proj);