Upgrade to softfloat3e.

This should solve licensing problems as well.

src/cpu/softfloat3e/f32_compare.c

@@ -0,0 +1,92 @@
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3e, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014, 2015, 2016 The Regents of the University of
+California.  All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ 1. Redistributions of source code must retain the above copyright notice,
+    this list of conditions, and the following disclaimer.
+
+ 2. 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.
+
+ 3. Neither the name of the University nor the names of its contributors may
+    be used to endorse or promote products derived from this software without
+    specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "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 REGENTS OR CONTRIBUTORS 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 <stdbool.h>
+#include <stdint.h>
+#include "internals.h"
+#include "softfloat.h"
+
+/*----------------------------------------------------------------------------
+| Compare  between  two  single  precision  floating  point  numbers. Returns
+| 'float_relation_equal'  if the operands are equal, 'float_relation_less' if
+| the    value    'a'   is   less   than   the   corresponding   value   `b',
+| 'float_relation_greater' if the value 'a' is greater than the corresponding
+| value `b', or 'float_relation_unordered' otherwise.
+*----------------------------------------------------------------------------*/
+
+int f32_compare(float32 a, float32 b, bool quiet, struct softfloat_status_t *status)
+{
+    softfloat_class_t aClass;
+    softfloat_class_t bClass;
+    bool signA;
+    bool signB;
+
+    aClass = f32_class(a);
+    bClass = f32_class(b);
+
+    if (aClass == softfloat_SNaN || bClass == softfloat_SNaN) {
+        softfloat_raiseFlags(status, softfloat_flag_invalid);
+        return softfloat_relation_unordered;
+    }
+
+    if (aClass == softfloat_QNaN || bClass == softfloat_QNaN) {
+        if (! quiet) softfloat_raiseFlags(status, softfloat_flag_invalid);
+        return softfloat_relation_unordered;
+    }
+
+    if (aClass == softfloat_denormal) {
+        if (softfloat_denormalsAreZeros(status))
+            a = a & 0x80000000;
+        else
+            softfloat_raiseFlags(status, softfloat_flag_denormal);
+    }
+
+    if (bClass == softfloat_denormal) {
+        if (softfloat_denormalsAreZeros(status))
+            b = b & 0x80000000;
+        else
+            softfloat_raiseFlags(status, softfloat_flag_denormal);
+    }
+
+    if ((a == b) || ((uint32_t) ((a | b)<<1) == 0)) return softfloat_relation_equal;
+
+    signA = signF32UI(a);
+    signB = signF32UI(b);
+    if (signA != signB)
+        return (signA) ? softfloat_relation_less : softfloat_relation_greater;
+
+    if (signA ^ (a < b)) return softfloat_relation_less;
+    return softfloat_relation_greater;
+}