Add regvar_w() and regvar_d() for use with reglap.

If the ncg table uses reglap, then regvar($1, reg_float) would have
two sizes of registers.  An error from ncgg would happen if regvar()
was in a token that allows only one size.  Now one can pick a size
with regvar_w() for word size or regvar_d() for double-word size.

Add regvar_d and regvar_w as keywords in ncgg.  Modify EX_REGVAR to
include the register size.  In ncg, add some checks for the register
size.  In tables without reglap, regvar() works as before, and ncg
ignores the register size in EX_REGVAR.

mach/proto/ncg/compute.c

@@ -385,7 +385,7 @@ compute(node, presult) register node_p node; register result_t *presult; {
 		return;
 	case EX_REGVAR:
 	assert(leaf1.e_typ == EV_INT);
-		i = isregvar((long) leaf1.e_v.e_con);
+		i = isregvar_size((long) leaf1.e_v.e_con, node->ex_rnode);
 		if (i<=0)  {
 			presult->e_typ = EV_UNDEF;
 			return;
@@ -393,7 +393,7 @@ compute(node, presult) register node_p node; register result_t *presult; {
 		presult->e_typ = EV_REG;
 		presult->e_v.e_reg=i;
 		return;
-#endif
+#endif /* REGVARS */
 	case EX_UMINUS:
 	assert(leaf1.e_typ == EV_INT);
 		presult->e_v.e_con = -leaf1.e_v.e_con;

mach/proto/ncg/subr.c

@@ -211,7 +211,9 @@ cinstance(instno,token,tp,regno) register token_p token,tp; {
 			compute(&enodes[inp->in_info[1]], &result);
 			curtoken = ct;
 			assert(result.e_typ==EV_INT);
-			if ((regno=isregvar(result.e_v.e_con)) > 0) {
+			regno = isregvar_size(result.e_v.e_con,
+					      tokens[inp->in_info[0]].t_size);
+			if (regno > 0) {
 				token->t_token = -1;
 				token->t_att[0].ar = regno;
 				for (i=TOKENSIZE-1;i>0;i--)

util/ncgg/cgg.y

@@ -78,7 +78,8 @@ iocc_t iops[20];
 %token PATTERNS PAT WITH EXACT KILLS USES REUSING GEN YIELDS LEAVING
 %token DEFINED SAMESIGN SFIT UFIT ROM LOWW HIGHW ISROM
 %token CMPEQ CMPNE CMPLT CMPGT CMPLE CMPGE OR2 AND2 LSHIFT RSHIFT NOT COMP
-%token INREG REGVAR REG_ANY REG_FLOAT REG_LOOP REG_POINTER
+%token INREG REGVAR REGVAR_W REGVAR_D
+%token REG_ANY REG_FLOAT REG_LOOP REG_POINTER
 %token <yy_int> ADORNACCESS
 %token <yy_int> ADORNCC
 %token INT
@@ -1086,7 +1087,11 @@ expr
 
 regvarexpr
 	: REGVAR '(' expr optregvartype ')'
-		{ $$ = regvar_expr($3,$4); }
+		{ $$ = regvar_expr($3,$4,-1); }
+	| REGVAR_W '(' expr optregvartype ')'
+		{ $$ = regvar_expr($3,$4,wordsize); }
+	| REGVAR_D '(' expr optregvartype ')'
+		{ $$ = regvar_expr($3,$4,2*wordsize); }
 	;
 
 optregvartype

util/ncgg/expr.c

@@ -274,22 +274,36 @@ expr_t iextoaddr(e) expr_t e; {
 	return(result);
 }
 
-expr_t regvar_expr(e,regtyp) expr_t e; {
+expr_t regvar_expr(e,regtyp,regsiz) expr_t e; {
 	expr_t result;
-	register i;
+	int i, regno, s, two_sizes;
 
-	result = make_expr(TYPREG,EX_REGVAR,i_expr(e),0);
+	two_sizes = (regtyp == reg_float && reglap != 0);
+	if (regsiz == -1) {
+		/* reglap: Can't guess between 2 sizes of reg_float. */
+		if (two_sizes && regsiz == -1)
+			error("Must use regvar_w() or regvar_d()");
+		else
+			regsiz = rvsize[regtyp];
+	}
+
+	result = make_expr(TYPREG,EX_REGVAR,i_expr(e),regsiz);
 	for(i=0;i<SZOFSET(MAXREGS);i++)
 		result.ex_regset[i]=0;
-	for(i=0;i<nregvar[regtyp];i++)
-		BIS(result.ex_regset,rvnumbers[regtyp][i]);
-	/* reglap: float may overlap with one subregister */
-	if (reglap!=0 && regtyp==reg_float) {
+
+	/* s = the size of the registers in rvnumbers[regtyp] */
+	s = two_sizes ? reglap : rvsize[regtyp];
+	if (s == regsiz) {
+		for(i=0;i<nregvar[regtyp];i++)
+			BIS(result.ex_regset,rvnumbers[regtyp][i]);
+	}
+	/* reglap: Also check the 2nd size of reg_float. */
+	if (two_sizes && rvsize[regtyp] == regsiz) {
 		for(i=0;i<nregvar[regtyp];i++) {
-			/* reg = first subregister */
-			int reg = l_regs[rvnumbers[regtyp][i]].ri_memb[0];
-			if (reg!=0)
-				BIS(result.ex_regset,reg);
+			/* regno = first subregister */
+			regno = l_regs[rvnumbers[regtyp][i]].ri_memb[0];
+			if (regno != 0)
+				BIS(result.ex_regset, regno);
 		}
 	}
 	return(result);

util/ncgg/instruct.c

@@ -175,7 +175,11 @@ found:
 		case IN_D_DESCR:
 			{ int temp;
 
-			temp=ex_lookup(EX_REGVAR,insta->in_info[1],0);
+			if (insta->in_which == IN_S_DESCR)
+				temp = wordsize;
+			else
+				temp = 2 * wordsize;
+			temp=ex_lookup(EX_REGVAR,insta->in_info[1],temp);
 			vi->vi_next = generase(temp);
 			vi = vi->vi_next;
 			vi->vi_next = genremove(temp);

util/ncgg/keywords

@@ -38,6 +38,8 @@ reg_float	REG_FLOAT
 reg_loop	REG_LOOP
 reg_pointer	REG_POINTER
 regvar	REGVAR
+regvar_d	REGVAR_D
+regvar_w	REGVAR_W
 return	RETURN
 reusing	REUSING
 rom	ROM