Commit 890d0e72 authored by Matthias Braun's avatar Matthias Braun
Browse files

correctly handle cmps that can't be evaluated

[r15596]
parent b6b7ac79
......@@ -329,12 +329,16 @@ static void copy_and_fix(const condeval_env_t *env, ir_node *block,
}
}
/**
* returns wether the cmp evaluates to true or false, or can't be evaluated!
* 1: true, 0: false, -1: can't evaluate
*/
static int eval_cmp(pn_Cmp pnc, tarval *tv1, tarval *tv2) {
pn_Cmp cmp_result = tarval_cmp(tv1, tv2);
// does the compare evaluate to true?
if(cmp_result == pn_Cmp_False)
return 0;
return -1;
if((cmp_result & pnc) != cmp_result)
return 0;
......@@ -353,7 +357,7 @@ static ir_node *find_const(condeval_env_t *env, ir_node *jump, ir_node *value)
tarval *tv_const = get_Const_tarval(env->cnst);
tarval *tv = get_Const_tarval(value);
if(!eval_cmp(env->pnc, tv, tv_const)) {
if(eval_cmp(env->pnc, tv, tv_const) <= 0) {
return NULL;
}
......@@ -569,6 +573,8 @@ static void cond_eval(ir_node* block, void* data)
tarval *tv_right = get_Const_tarval(right);
selector_evaluated = eval_cmp(pnc, tv_left, tv_right);
if(selector_evaluated < 0)
return;
}
}
} else if(is_Const(selector)) {
......
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