ref: a0e2bdc94eb6fd60818d9278fe7ab23d223518ae
dir: /cc2/optm.c/
#include <stddef.h> #include <inttypes.h> #include "../inc/cc.h" #include "cc2.h" #include <stdio.h> static Node * optcasts(Node *np, Type *tp) { if (!np) return NULL; repeat: switch (np->op) { case OCAST: /* TODO: be careful with the sign */ if (np->type.flags&INTF && np->type.size >= tp->size) { np = np->left; goto repeat; } break; case OASSIG: tp = &np->type; break; default: if (np->type.size > tp->size) np->type = *tp; break; } np->left = optcasts(np->left, tp); np->right = optcasts(np->right, tp); return np; } static Node * opt(Node *np) { np = optcasts(np, &np->type); return np; } void optimize(void) { apply(opt); }