ref: 06411a4af49b020ced2d40e295afe72605caaec8
dir: /cc2/peep.c/
#include <inttypes.h> #include <stddef.h> #include "../inc/cc.h" #include "cc2.h" void peephole(void) { Addr to, from; TINT i; uint8_t op; for (pc = prog; pc; pc = pc->next) { to = pc->to; from = pc->from; switch (pc->op) { case SUB: case ADD: if (from.kind == CONST) { if ((i = from.u.i) == 0 || i < 4) { delcode(); op = (pc->op == ADD) ? INC : DEC; while (i--) inscode(op, &to, NULL); } /* TODO: More optimizations (ex: -1) */ } break; case JP: if (to.u.sym->u.pc == pc->next) delcode(); break; } } }