diff --git a/inc/math.h b/inc/math.h
index 2cc3ce4..e55d380 100644
--- a/inc/math.h
+++ b/inc/math.h
@@ -1,7 +1,7 @@
 
 #pragma once
 
-typedef float float_t;
+typedef float  float_t;
 typedef double double_t;
 
 #ifndef _HUGE_ENUF
diff --git a/inc/tgmath.h b/inc/tgmath.h
index 6e7feb2..26ad002 100644
--- a/inc/tgmath.h
+++ b/inc/tgmath.h
@@ -1,40 +1,63 @@
 
 #pragma once
 
-/*
-these are type generic so they're macrod and use C11's _Generic
+#include <math.h>
 
-acos
-asin
-atan
-acosh
-asinh
-atanh
-cos
-sin
-tan
-cosh
-sinh
-tanh
-exp
-log
-pow
-sqrt
-fabs
-atan2
-cbrt
-ceil
-copysign
+#define _tg_is_ld(x) (sizeof(x) == sizeof(long double))
+#define _tg_is_d (x) (sizeof(x) == sizeof(double))
+
+#define _tg_is_ld2(x,y) (_tg_is_ld(x) || _tg_is_ld(y))
+#define _tg_is_d2 (x,y) (_tg_is_d (x) || _tg_is_d (y))
+
+#define _tg_func1(func, x)    ( _tg_is_ld(x) ? (func ## l)(x) \
+                              : _tg_is_d(x)  ? (func)(x)      \
+                                             : (func ## f)(x) )
+
+#define _tf_func2(func, x, t) ( _tg_is_ld2(x,y) ? (func ## l)(x,y) \
+                              : _tg_is_d2(x,y)  ? (func)(x,y)      \
+                                                : (func ## f)(x,y) )
+
+#define cos   (x)   _tg_func1(cos,   x)
+#define sin   (x)   _tg_func1(sin,   x)
+#define tan   (x)   _tg_func1(tan,   x)
+#define acos  (x)   _tg_func1(acos,  x)
+#define asin  (x)   _tg_func1(asin,  x)
+#define atan  (x)   _tg_func1(atan,  x)
+#define atan2 (x,y) _tg_func2(atan2, x, y)
+
+#define cosh  (x)   _tg_func1(cosh,  x)
+#define sinh  (x)   _tg_func1(sinh,  x)
+#define tanh  (x)   _tg_func1(tanh,  x)
+#define acosh (x)   _tg_func1(acosh, x)
+#define asinh (x)   _tg_func1(asinh, x)
+#define atanh (x)   _tg_func1(atanh, x)
+
+#define exp   (x)   _tg_func1(exp,   x)
+#define exp2  (x)   _tg_func1(exp2,  x)
+#define pow   (x,y) _tg_func2(pow,   x, y)
+#define log   (x,y) _tg_func2(log,   x, y)
+#define sqrt  (x)   _tg_func1(sqrt,  x)
+#define cbrt  (x)   _tg_func1(cbrt,  x)
+#define fabs  (x)   _tg_func1(fabs,  x)
+
+#define ceil  (x)   _tg_func1(ceil,  x)
+#define floor (x)   _tg_func1(floor, x)
+#define round (x)   _tg_func1(round, x)
+#define trunc (x)   _tg_func1(trunc, x)
+
+#define copysign(x,y) _tg_func2(copysign, x, y)
+
+#define fmax  (x,y) _tg_func2(fmax, x, y)
+#define fmin  (x,y) _tg_func2(fmin, x, y)
+#define fmod  (x,y) _tg_func2(fmod, x, y)
+
+/*
 erf
 erfc
 exp2
 expm1
 fdim
-floor
 fma
-fmax
-fmin
-fmod
 frexp
 hypot
 ilogb
@@ -54,11 +77,9 @@ nexttoward
 remainder
 remquo
 rint
-round
 scalbn
 scalbln
 tgamma
-trunc
 carg
 cimag
 conj