diff --git a/mach/powerpc/ncg/mach.c b/mach/powerpc/ncg/mach.c
index 32e05daa3..6e0eef98b 100644
--- a/mach/powerpc/ncg/mach.c
+++ b/mach/powerpc/ncg/mach.c
@@ -9,6 +9,7 @@
  */
 
 #include <limits.h>
+#include <stdint.h>
 
 static long framesize;
 
@@ -106,7 +107,7 @@ char *segname[] = {
 static long savedf[32];
 static long savedi[32];
 static int savedtop;
-static unsigned long lfs_set;
+static uint32_t lfs_set;
 
 /* Calculate the register score of a local variable. */
 int
@@ -172,7 +173,7 @@ regsave(const char* regname, long offset, int size)
 			savedf[regnum] = offset;
 			framesize += 8;
 			if (size == 4)
-				lfs_set |= (1U << regnum);
+				lfs_set |= ((uint32_t)1<<regnum);
 			break;
 		case 'r':
 			savedi[regnum] = offset;
@@ -236,7 +237,7 @@ f_regsave(void)
 	for (reg = 31; reg >= 0; reg--)
 		if (savedf[reg] >= 0)
 			fprintf(codefile, "%s f%d, %ld(fp)\n",
-				(lfs_set & (1U << reg)) ? "lfs" : "lfd",
+				(lfs_set & ((uint32_t)1<<reg)) ? "lfs" : "lfd",
 				reg, savedf[reg]);
 
 	for (reg = 31; reg >= 0; reg--)
diff --git a/mach/proto/ncg/compute.c b/mach/proto/ncg/compute.c
index 926ffeb3c..41e159f04 100644
--- a/mach/proto/ncg/compute.c
+++ b/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_size((long) leaf1.e_v.e_con, node->ex_rnode);
+		i = PICK_REGVAR((long) leaf1.e_v.e_con, node->ex_rnode);
 		if (i<=0)  {
 			presult->e_typ = EV_UNDEF;
 			return;
diff --git a/mach/proto/ncg/regvar.h b/mach/proto/ncg/regvar.h
index cd7da216f..089bd72b1 100644
--- a/mach/proto/ncg/regvar.h
+++ b/mach/proto/ncg/regvar.h
@@ -28,8 +28,12 @@ void fixregvars(int);
 int isregvar(long);
 #ifdef REGLAP
 int isregvar_size(long, int);
-#else
-#define isregvar_size(off, size) isregvar(off)
 #endif
 int isregtyp(long);
 void unlinkregs(void);
+
+#ifdef REGLAP
+#define PICK_REGVAR(off, size) isregvar_size(off, size)
+#else
+#define PICK_REGVAR(off, size) isregvar(off)
+#endif
diff --git a/mach/proto/ncg/subr.c b/mach/proto/ncg/subr.c
index 4540d8b00..fd6b72718 100644
--- a/mach/proto/ncg/subr.c
+++ b/mach/proto/ncg/subr.c
@@ -121,8 +121,8 @@ instance(instno,token) register token_p token; {
 	case IN_D_DESCR:
 		compute(&enodes[inp->in_info[1]], &result);
 		assert(result.e_typ==EV_INT);
-		regno = isregvar_size(result.e_v.e_con,
-				      tokens[inp->in_info[0]].t_size);
+		regno = PICK_REGVAR(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;
@@ -211,8 +211,8 @@ 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);
-			regno = isregvar_size(result.e_v.e_con,
-					      tokens[inp->in_info[0]].t_size);
+			regno = PICK_REGVAR(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;
diff --git a/util/ncgg/cgg.y b/util/ncgg/cgg.y
index d2f1532b3..c77f566d7 100644
--- a/util/ncgg/cgg.y
+++ b/util/ncgg/cgg.y
@@ -130,8 +130,9 @@ machtable
 	: constants
 	  properties
 	  registers
+		{ check_reglap(); }
 	  tokens
-	  	{ make_std_sets(); }
+		{ make_std_sets(); }
 	  sets
 	  instructions
 	  moves
diff --git a/util/ncgg/subr.c b/util/ncgg/subr.c
index 89b2b0917..7fc0cdd48 100644
--- a/util/ncgg/subr.c
+++ b/util/ncgg/subr.c
@@ -254,9 +254,11 @@ add_regvar(int rvnum, reginfo *regp, int rv)
 	wrong = 0;
 	if (overlap) {
 		/* reglap = size of overlap float */
-		if (reglap==0)
+		if (reglap==0) {
 			reglap = regp->ri_size;
-		else if (reglap!=regp->ri_size)
+			if (reglap == rvsize[reg_float])
+				error("Two sizes of reg_float can't be same size");
+		} else if (reglap!=regp->ri_size)
 			wrong = 1;
 	} else {
 		if (nregvar[rv]==0)
@@ -322,6 +324,23 @@ regline(rl,pl,rv) varinfo *rl,*pl; {
 	regclass++;
 }
 
+void
+check_reglap() {
+	reginfo *regp;
+	int i;
+
+	if (reglap == 0)
+		return;
+
+	/* reglap: Check that every reg_float has size == reglap. */
+	for (i = 0; i < nregvar[reg_float]; i++) {
+		regp = &l_regs[rvnumbers[reg_float][i]];
+		if (regp->ri_size != reglap)
+			error("Missing reg_float of size %d to contain %s",
+			      reglap, regp->ri_name);
+	}
+}
+
 setallreg(vi) struct varinfo *vi; {
 
 	nallreg=0;