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Fix fold-dce for if(0)

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This commit is contained in:
Dale Weiler 2013-08-28 10:39:48 -04:00
parent 40bcec5044
commit ee428b9081
1 changed files with 9 additions and 2 deletions
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11
fold.c
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@ -707,8 +707,15 @@ int fold_cond(ir_value *condval, ast_function *func, ast_ifthen *branch) {
bool isfalse = (fold_immvalue_float(condval) == 0.0f && branch->on_false);
ast_expression *path = (istrue) ? branch->on_true :
(isfalse) ? branch->on_false : NULL;
if (!path)
return false;
if (!path) {
/*
* no path to take implies that the evaluation is if(0) and there
* is no else block. so eliminate all the code.
*/
++opts_optimizationcount[OPTIM_CONST_FOLD_DCE];
return true;
}
if (!(elide = ir_function_create_block(ast_ctx(branch), func->ir_func, ast_function_label(func, ((istrue) ? "ontrue" : "onfalse")))))
return false;
if (!(*(cgen = path->codegen))((ast_expression*)path, func, false, &dummy))