shithub: scc

Info  •  Files  •  Log  •  Branches

Use a Node array instead of bool in reguse

We want to know whcich is the node which is using some register
so the best option is to keep it in the register array.

--- a/cc2/cgen.c

+++ b/cc2/cgen.c

@@ -8,7 +8,7 @@

 #include "cc2.h"

-static bool reguse[NREGS];

+static Node *reguse[NREGS];

 static char upper[] = {[DE] = D, [HL] = H, [BC] = B,  [IY] = IYH};

 static char lower[] = {[DE] = E, [HL] = L, [BC] = C, [IY] = IYL};

@@ -88,7 +88,7 @@

 allocreg(Node *np)

 {

 	static char reg8[] = {A, B, C, D, E, H, L, IYL, IY, 0};

-	static char reg16[] = {BC, HL, DE, IY, 0};

+	static char reg16[] = {BC, DE, IY, 0};

 	char *bp, c;

 	switch (np->type.size) {

@@ -96,7 +96,7 @@

 		for (bp = reg8; (c = *bp); ++bp) {

 			if (reguse[c])

 				continue;

-			reguse[c] = 1;

+			reguse[c] = np;

 			return c;

 		}

 		/* TODO: Move variable to stack using PUSH/POP */

@@ -107,8 +107,7 @@

 			if (reguse[u] || reguse[l])

 				continue;

-			reguse[l] = 1;

-			reguse[u];

+			reguse[u] = reguse[l] = np;

 			return c;

 		}

 		/* TODO: Move variable to stack using PUSH/POP */