Not enough register for reading expression

[sysprog21]

Not enough register for reading expression

[jserv]

An effective evaluator is required for parsed expression. Which parts of C front-end would be modified to fit?

[eecheng87]

Maybe I need to modify read_expr which also contains read_operand (most complicate part).
It seems modern compiler will also evaluate result of function in expression during compile time, should we follow this? Following is example:

int f(int b){
	int c = 10;
	return b * c + 1;
}
void _start(){
    int a;
    int c = 10;
    a = 1 + ( f(1) + (1 + (1 + (1 + (1 + (1 + (1 + (1 + (1 + (1 + (20 + (3 + (1 + (1 + (6 + (1 + (1 + (1 + 20))))))))))))))))));
    print(a);

corresponding asm

00010068 <_start>:
   10068:	400027b7          	lui	a5,0x40002
   1006c:	04b00713          	li	a4,75
   10070:	00e78023          	sb	a4,0(a5) # 40002000 <__global_pointer$+0x3fff0788>