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Experimental/Initial try at in-ast constant folding. (for TYPE_FLOAT currently .. since comparisions on UTF8 strings need to be worked out yet ..)

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Dale Weiler 2013-07-30 18:06:42 +00:00
parent 2c975fe48f
commit d8b931fbcf
1 changed files with 25 additions and 0 deletions
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25
ast.c
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@ -2531,6 +2531,31 @@ bool ast_ifthen_codegen(ast_ifthen *self, ast_function *func, bool lvalue, ir_va
/* update the block which will get the jump - because short-logic or ternaries may have changed this */ /* update the block which will get the jump - because short-logic or ternaries may have changed this */
cond = func->curblock; cond = func->curblock;
/* eliminate branches if value is constant */
if (condval->vtype == TYPE_FLOAT && condval->hasvalue && condval->cvq == CV_CONST) {
/* don't generate if statements */
if (condval->constval.vfloat == 1.0f && self->on_true) {
if (!(ontrue = ir_function_create_block(ast_ctx(self), func->ir_func, ast_function_label(func, "ontrue"))))
return false;
/* generate */
if (!(*(cgen = self->on_true->codegen))((ast_expression*)(self->on_true), func, false, &dummy))
return false;
if (!ir_block_create_jump(func->curblock, ast_ctx(self), ontrue))
return false;
func->curblock = ontrue;
return true;
} else if (condval->constval.vfloat == 0.0f && self->on_false) {
if (!(onfalse = ir_function_create_block(ast_ctx(self), func->ir_func, ast_function_label(func, "onfalse"))))
return false;
/* generate */
if (!(*(cgen = self->on_false->codegen))((ast_expression*)(self->on_false), func, false, &dummy))
return false;
if (!ir_block_create_jump(func->curblock, ast_ctx(self), onfalse))
return false;
func->curblock = onfalse;
return true;
}
}
/* on-true path */ /* on-true path */
if (self->on_true) { if (self->on_true) {