diff --git a/sys/src/libmp/test.c b/sys/src/libmp/test.c
new file mode 100644
index 000000000..47033a5dd
--- /dev/null
+++ b/sys/src/libmp/test.c
@@ -0,0 +1,446 @@
+#include <u.h>
+#include <libc.h>
+#include <mp.h>
+#include "dat.h"
+
+int loops = 1;
+
+void
+prng(uchar *p, int n)
+{
+	while(n-- > 0)
+		*p++ = rand();
+}
+
+void
+testconv(char *str)
+{
+	int i, base[] = {2,8,10,16,32,64};
+	mpint *b;
+	char *p;
+
+	print("testconv \"%s\":\n", str);
+	b = strtomp(str, nil, 16, nil);
+
+	for(i=0; i<nelem(base); i++){
+		p = mptoa(b, base[i], nil, 0);
+		print("base%d: %s = ", base[i], p);
+		if(strtomp(p, nil, base[i], b) == nil)
+			abort();
+		free(p);
+		print("%B\n", b, base[i], b);
+
+		switch(base[i]){
+		case 2:
+		case 8:
+		case 10:
+		case 16:
+			p = smprint("%#.*B", base[i], b);
+			print("# %s = ", p);
+			if(strtomp(p, nil, 0, b) == nil)
+				abort();
+			free(p);
+			print("%#.*B\n", base[i], b);
+			break;
+		}
+
+	}
+
+	mpfree(b);
+}
+
+void
+testshift(char *str)
+{
+	mpint *b1, *b2;
+	int i;
+
+	b1 = strtomp(str, nil, 16, nil);
+	b2 = mpnew(0);
+	for(i = 0; i < 64; i++){
+		mpleft(b1, i, b2);
+		print("%2.2d %B\n", i, b2);
+	}
+	for(i = 0; i < 64; i++){
+		mpright(b2, i, b1);
+		print("%2.2d %B\n", i, b1);
+	}
+	mpfree(b1);
+	mpfree(b2);
+}
+
+void
+testaddsub(char *str)
+{
+	mpint *b1, *b2;
+	int i;
+
+	b1 = strtomp(str, nil, 16, nil);
+	b2 = mpnew(0);
+	for(i = 0; i < 16; i++){
+		mpadd(b1, b2, b2);
+		print("%2.2d %B\n", i, b2);
+	}
+	for(i = 0; i < 16; i++){
+		mpsub(b2, b1, b2);
+		print("%2.2d %B\n", i, b2);
+	}
+	mpfree(b1);
+	mpfree(b2);
+}
+
+void
+testvecdigmuladd(char *str, mpdigit d)
+{
+	mpint *b, *b2;
+	int i;
+	vlong now;
+
+	b = strtomp(str, nil, 16, nil);
+	b2 = mpnew(0);
+
+	mpbits(b2, (b->top+1)*Dbits);
+	now = nsec();
+	for(i = 0; i < loops; i++){
+		memset(b2->p, 0, b2->top*Dbytes);
+		mpvecdigmuladd(b->p, b->top, d, b2->p);
+	}
+	if(loops > 1)
+		print("%lld ns for a %d*%d vecdigmul\n", (nsec()-now)/loops, b->top*Dbits, Dbits);
+	mpnorm(b2);
+	print("0 + %B * %ux = %B\n", b, d, b2);
+
+	mpfree(b);
+	mpfree(b2);
+}
+
+void
+testvecdigmulsub(char *str, mpdigit d)
+{
+	mpint *b, *b2;
+	int i;
+	vlong now;
+
+	b = strtomp(str, nil, 16, nil);
+	b2 = mpnew(0);
+
+	mpbits(b2, (b->top+1)*Dbits);
+	now = nsec();
+	for(i = 0; i < loops; i++){
+		memset(b2->p, 0, b2->top*Dbytes);
+		mpvecdigmulsub(b->p, b->top, d, b2->p);
+	}
+	if(loops > 1)
+		print("%lld ns for a %d*%d vecdigmul\n", (nsec()-now)/loops, b->top*Dbits, Dbits);
+	mpnorm(b2);
+	print("0 - %B * %ux = %B\n", b, d, b2);
+
+	mpfree(b);
+	mpfree(b2);
+}
+
+void
+testmul(char *str)
+{
+	mpint *b, *b1, *b2;
+	vlong now;
+	int i;
+
+	b = strtomp(str, nil, 16, nil);
+	b1 = mpcopy(b);
+	b2 = mpnew(0);
+
+	now = nsec();
+	for(i = 0; i < loops; i++)
+		mpmul(b, b1, b2);
+	if(loops > 1)
+		print("%lld µs for a %d*%d mult\n", (nsec()-now)/(loops*1000),
+			b->top*Dbits, b1->top*Dbits);
+	print("%B * %B = %B\n", b, b1, b2);
+
+	mpfree(b);
+	mpfree(b1);
+	mpfree(b2);
+}
+
+void
+testmul2(mpint *b, mpint *b1)
+{
+	mpint *b2;
+	vlong now;
+	int i;
+
+	b2 = mpnew(0);
+
+	now = nsec();
+	for(i = 0; i < loops; i++)
+		mpmul(b, b1, b2);
+	if(loops > 1)
+		print("%lld µs for a %d*%d mult\n", (nsec()-now)/(loops*1000), b->top*Dbits, b1->top*Dbits);
+	print("%B * ", b);
+	print("%B = ", b1);
+	print("%B\n", b2);
+
+	mpfree(b2);
+}
+
+void
+testdigdiv(char *str, mpdigit d)
+{
+	mpint *b;
+	mpdigit q;
+	int i;
+	vlong now;
+
+	b = strtomp(str, nil, 16, nil);
+	now = nsec();
+	for(i = 0; i < loops; i++)
+		mpdigdiv(b->p, d, &q);
+	if(loops > 1)
+		print("%lld ns for a %d / %d div\n", (nsec()-now)/loops, 2*Dbits, Dbits);
+	print("%B / %ux = %ux\n", b, d, q);
+	mpfree(b);
+}
+
+void
+testdiv(mpint *x, mpint *y)
+{
+	mpint *b2, *b3;
+	vlong now;
+	int i;
+
+	b2 = mpnew(0);
+	b3 = mpnew(0);
+	now = nsec();
+	for(i = 0; i < loops; i++)
+		mpdiv(x, y, b2, b3);
+	if(loops > 1)
+		print("%lld µs for a %d/%d div\n", (nsec()-now)/(1000*loops),
+			x->top*Dbits, y->top*Dbits);
+	print("%B / %B = %B %B\n", x, y, b2, b3);
+	mpfree(b2);
+	mpfree(b3);
+}
+
+void
+testmod(mpint *x, mpint *y)
+{
+	mpint *r;
+	vlong now;
+	int i;
+
+	r = mpnew(0);
+	now = nsec();
+	for(i = 0; i < loops; i++)
+		mpmod(x, y, r);
+	if(loops > 1)
+		print("%lld µs for a %d/%d mod\n", (nsec()-now)/(1000*loops),
+			x->top*Dbits, y->top*Dbits);
+	print("%B mod %B = %B\n", x, y, r);
+	mpfree(r);
+}
+
+void
+testinvert(mpint *x, mpint *y)
+{
+	mpint *r, *d1, *d2;
+	vlong now;
+	int i;
+
+	r = mpnew(0);
+	d1 = mpnew(0);
+	d2 = mpnew(0);
+	now = nsec();
+	mpextendedgcd(x, y, r, d1, d2);
+	mpdiv(x, r, x, d1);
+	mpdiv(y, r, y, d1);
+	for(i = 0; i < loops; i++)
+		mpinvert(x, y, r);
+	if(loops > 1)
+		print("%lld µs for a %d in %d invert\n", (nsec()-now)/(1000*loops),
+			x->top*Dbits, y->top*Dbits);
+	print("%B**-1 mod %B = %B\n", x, y, r);
+	mpmul(r, x, d1);
+	mpmod(d1, y, d2);
+	print("%B*%B mod %B = %B\n", x, r, y, d2);
+	mpfree(r);
+	mpfree(d1);
+	mpfree(d2);
+}
+
+void
+testsub1(char *a, char *b)
+{
+	mpint *b1, *b2, *b3;
+
+	b1 = strtomp(a, nil, 16, nil);
+	b2 = strtomp(b, nil, 16, nil);
+	b3 = mpnew(0);
+	mpsub(b1, b2, b3);
+	print("%B - %B = %B\n", b1, b2, b3);
+}
+
+void
+testmul1(char *a, char *b)
+{
+	mpint *b1, *b2, *b3;
+
+	b1 = strtomp(a, nil, 16, nil);
+	b2 = strtomp(b, nil, 16, nil);
+	b3 = mpnew(0);
+	mpmul(b1, b2, b3);
+	print("%B * %B = %B\n", b1, b2, b3);
+}
+
+void
+testexp(char *base, char *exp, char *mod)
+{
+	mpint *b, *e, *m, *res;
+	int i;
+	uvlong now;
+
+	b = strtomp(base, nil, 16, nil);
+	e = strtomp(exp, nil, 16, nil);
+	res = mpnew(0);
+	if(mod != nil)
+		m = strtomp(mod, nil, 16, nil);
+	else
+		m = nil;
+	now = nsec();
+	for(i = 0; i < loops; i++)
+		mpexp(b, e, m, res);
+	if(loops > 1)
+		print("%ulldµs for a %d to the %d bit exp\n", (nsec()-now)/(loops*1000),
+			b->top*Dbits, e->top*Dbits);
+	if(m != nil)
+		print("%B ^ %B mod %B == %B\n", b, e, m, res);
+	else
+		print("%B ^ %B == %B\n", b, e, res);
+	mpfree(b);
+	mpfree(e);
+	mpfree(res);
+	if(m != nil)
+		mpfree(m);
+}
+
+void
+testgcd(void)
+{
+	mpint *a, *b, *d, *x, *y, *t1, *t2;
+	int i;
+	uvlong now, then;
+	uvlong etime;
+
+	d = mpnew(0);
+	x = mpnew(0);
+	y = mpnew(0);
+	t1 = mpnew(0);
+	t2 = mpnew(0);
+
+	etime = 0;
+
+	a = strtomp("4EECAB3E04C4E6BC1F49D438731450396BF272B4D7B08F91C38E88ADCD281699889AFF872E2204C80CCAA8E460797103DE539D5DF8335A9B20C0B44886384F134C517287202FCA914D8A5096446B40CD861C641EF9C2730CB057D7B133F4C2B16BBD3D75FDDBD9151AAF0F9144AAA473AC93CF945DBFE0859FB685D5CBD0A8B3", nil, 16, nil);
+	b = strtomp("C41CFBE4D4846F67A3DF7DE9921A49D3B42DC33728427AB159CEC8CBBDB12B5F0C244F1A734AEB9840804EA3C25036AD1B61AFF3ABBC247CD4B384224567A863A6F020E7EE9795554BCD08ABAD7321AF27E1E92E3DB1C6E7E94FAAE590AE9C48F96D93D178E809401ABE8A534A1EC44359733475A36A70C7B425125062B1142D", nil, 16, nil);
+	mpextendedgcd(a, b, d, x, y);
+	print("gcd %B*%B+%B*%B = %B?\n", a, x, b, y, d);
+	mpfree(a);
+	mpfree(b);
+
+	for(i = 0; i < loops; i++){
+		a = mprand(2048, prng, nil);
+		b = mprand(2048, prng, nil);
+		then = nsec();
+		mpextendedgcd(a, b, d, x, y);
+		now = nsec();
+		etime += now-then;
+		mpmul(a, x, t1);
+		mpmul(b, y, t2);
+		mpadd(t1, t2, t2);
+		if(mpcmp(d, t2) != 0)
+			print("%d gcd %B*%B+%B*%B != %B\n", i, a, x, b, y, d);
+//		else
+//			print("%d euclid %B*%B+%B*%B == %B\n", i, a, x, b, y, d);
+		mpfree(a);
+		mpfree(b);
+	}
+
+	mpfree(x);
+	mpfree(y);
+	mpfree(d);
+	mpfree(t1);
+	mpfree(t2);
+
+	if(loops > 1)
+		print("binary %llud\n", etime);
+}
+
+extern int _unnormalizedwarning = 1;
+
+void
+main(int argc, char **argv)
+{
+	mpint *x, *y;
+
+	ARGBEGIN{
+	case 'n':
+		loops = atoi(ARGF());
+		break;
+	}ARGEND;
+
+	fmtinstall('B', mpfmt);
+	fmtinstall('Q', mpfmt);
+	srand(0);
+	mpsetminbits(2*Dbits);
+	testshift("1111111111111111");
+	testaddsub("fffffffffffffffff");
+	testdigdiv("1234567812345678", 0x76543218);
+	testdigdiv("1ffff", 0xffff);
+	testdigdiv("ffff", 0xffff);
+	testdigdiv("fff", 0xffff);
+	testdigdiv("effffffff", 0xffff);
+	testdigdiv("ffffffff", 0x1);
+	testdigdiv("ffffffff", 0);
+	testdigdiv("200000000", 2);
+	testdigdiv("ffffff00fffffff1", 0xfffffff1);
+	testvecdigmuladd("fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 2);
+	testconv("0");
+	testconv("-abc0123456789abcedf");
+	testconv("abc0123456789abcedf");
+	testconv("ffffffff");
+	testconv("aaaaaaaaaaaaaaaaa");
+	testconv("1111111111111111");
+	testconv("33333333333333333333333333333333");
+
+	testvecdigmulsub("fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", 2);
+	testsub1("1FFFFFFFE00000000", "FFFFFFFE00000001");
+	testmul1("ffffffff", "f");
+	testmul("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");
+	testmul1("100000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000030000000000000000000000000000000000000000000000000000000400000000000000000000000000000000000000000000000000000004FFFFFFFFFFFFFFFE0000000200000000000000000000000000000003FFFFFFFFFFFFFFFE0000000200000000000000000000000000000002FFFFFFFFFFFFFFFE0000000200000000000000000000000000000001FFFFFFFFFFFFFFFE0000000200000000000000000000000000000000FFFFFFFFFFFFFFFE0000000200000000FFFFFFFE00000001", "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
+	testmul1("1000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001", "1000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001");
+	testmul1("1000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001", "1000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001000000000000000000000001");
+	testmul1("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000");
+	x = mprand(256, prng, nil);
+	y = mprand(128, prng, nil);
+	testdiv(x, y);
+	x = mprand(2048, prng, nil);
+	y = mprand(1024, prng, nil);
+	testdiv(x, y);
+//	x = mprand(4*1024, prng, nil);
+//	y = mprand(4*1024, prng, nil);
+//	testmul2(x, y);
+	testsub1("677132C9", "-A26559B6");
+	testgcd();
+	x = mprand(512, prng, nil);
+	x->sign = -1;
+	y = mprand(256, prng, nil);
+	testdiv(x, y);
+	testmod(x, y);
+	x->sign = 1;
+	testinvert(y, x);
+	testexp("111111111", "222", "1000000000000000000000");
+	testexp("ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", "100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000");
+#ifdef asdf
+#endif adsf
+	print("done\n");
+	exits(0);
+}