Index: softfloat/generic/sub.c
===================================================================
--- softfloat/generic/sub.c	(revision 12c6f2dd96214d6bf7bc23f4e96554f665e93934)
+++ softfloat/generic/sub.c	(revision 12c6f2dd96214d6bf7bc23f4e96554f665e93934)
@@ -0,0 +1,139 @@
+/*
+ * Copyright (C) 2005 Josef Cejka
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "sftypes.h"
+#include "sub.h"
+
+/** Subtract two float32 numbers with same signs
+ */
+float32 subFloat32(float32 a, float32 b)
+{
+	int expdiff;
+	__u32 exp1,exp2,mant1,mant2;
+	float32 result;
+
+	result.f = 0;
+	
+	expdiff=a.parts.exp - b.parts.exp;
+	if ((expdiff<0)||((expdiff==0)&&(a.parts.mantisa<b.parts.mantisa))) {
+		if (isFloat32NaN(b)) {
+			//TODO: fix SigNaN
+			if (isFloat32SigNaN(b)) {
+			};
+			return b;
+		};
+		
+		if (b.parts.exp==0xFF) { 
+			b.parts.sign=!b.parts.sign; /* num -(+-inf) = -+inf */
+			return b;
+		}
+		
+		result.parts.sign = !a.parts.sign; 
+		
+		mant1=b.parts.mantisa;
+		exp1=b.parts.exp;
+		mant2=a.parts.mantisa;
+		exp2=a.parts.exp;
+		expdiff*=-1;
+	} else {
+		if (isFloat32NaN(a)) {
+			//TODO: fix SigNaN
+			if ((isFloat32SigNaN(a))||(isFloat32SigNaN(b))) {
+			};
+			return a;
+		};
+		
+		if (a.parts.exp==0xFF) { 
+			if (b.parts.exp==0xFF) {
+				/* inf - inf => nan */
+				//TODO: fix exception
+				result.binary = FLOAT32_NAN;
+				return result;
+			};
+			return a;
+		}
+		
+		result.parts.sign = a.parts.sign;
+		
+		mant1=a.parts.mantisa;
+		exp1=a.parts.exp;
+		mant2=b.parts.mantisa;
+		exp2=b.parts.exp;	
+	};
+	
+	if (exp1==0) {
+		//both are denormalized
+		result.parts.mantisa=mant1-mant2;
+		if (result.parts.mantisa>mant1) {
+			//TODO: underflow exception
+			return result;
+		};
+		result.parts.exp=0;
+		return result;
+	};
+	
+	// create some space for rounding
+	mant1<<=6;
+	mant2<<=6;
+	
+	mant1|=0x20000000; //add hidden bit
+	
+	
+	if (exp2==0) {
+		--expdiff;	
+	} else {
+		mant2|=0x20000000; //hidden bit
+	};
+	
+	if (expdiff>24) {
+	     goto done;	
+	     };
+	
+	mant1 = mant1-(mant2>>expdiff);
+done:
+	//TODO: find first nonzero digit and shift result and detect possibly underflow
+	while ((exp1>0)&&(!(mant1&0x20000000))) {
+		exp1--;
+		mant1 <<= 1;
+			/* TODO: fix underflow - mant1 == 0 does not necessary means underflow... */
+	};
+	
+	//rounding - if first bit after mantisa is set then round up	
+	mant1 += 0x20;
+
+	if (mant1&0x40000000) {
+		++exp1;
+		mant1>>=1;
+	};
+	
+	result.parts.mantisa = ((mant1&(~0x20000000))>>6); /*Clear hidden bit and shift */
+	result.parts.exp = exp1;
+	
+	return result;
+};
+
