ref: 3801978b851d9c808f913c22ced53e1e9e3be46b
parent: f957dc886547ffab16c9f743889f51f23726f13a
author: Roberto E. Vargas Caballero <k0ga@shike2.com>
date: Thu Mar 19 16:56:41 EDT 2015
Add SUB instruction This instruction is really similar to ADD, so basically we only had to add it.
--- a/cc2/cc2.h
+++ b/cc2/cc2.h
@@ -133,7 +133,8 @@
POP,
RET,
NOP,
- INC
+ INC,
+ SUB
};
enum {--- a/cc2/cgen.c
+++ b/cc2/cgen.c
@@ -260,7 +260,7 @@
}
static void
-add(Node *np)
+add(Node *np, uint8_t op)
{Node *lp = np->left, *rp = np->right;
uint8_t i;
@@ -321,7 +321,7 @@
abort();
}
add_A:
- code(ADD, lp, rp);
+ code((op == OADD) ? ADD : SUB, lp, rp);
np->op = REG;
np->reg = A;
break;
@@ -333,7 +333,7 @@
}
static void
-assign(Node *np)
+assign(Node *np, uint8_t op)
{Node *lp = np->left, *rp = np->right;
Symbol *sym = lp->sym;
@@ -368,9 +368,9 @@
np->reg = rp->reg;
}
-
-static void (*opnodes[])(Node *) = {+static void (*opnodes[])(Node *, uint8_t) = {[OADD] = add,
+ [OSUB] = add,
[OASSIG] = assign
};
@@ -378,6 +378,7 @@
cgen(Node *np, Node *parent)
{Node *lp, *rp;
+ uint8_t op;
if (!np)
return;
@@ -400,7 +401,8 @@
cgen(p, np);
cgen(q, np);
}
- (*opnodes[np->op])(np);
+ op = np->op;
+ (*opnodes[op])(np, op);
}
static Node *
--- a/cc2/code.c
+++ b/cc2/code.c
@@ -31,7 +31,8 @@
[POP] = inst1,
[RET] = inst0,
[NOP] = inst0,
- [INC] = inst1
+ [INC] = inst1,
+ [SUB] = inst2
};
static char *insttext[] = {@@ -45,7 +46,8 @@
[POP] = "POP",
[RET] = "RET",
[NOP] = "NOP",
- [INC] = "INC"
+ [INC] = "INC",
+ [SUB] = "SUB"
};
Inst *pc, *prog;