Upgrade to softfloat3e.

This should solve licensing problems as well.

src/cpu/softfloat3e/f32_range.c

@@ -0,0 +1,134 @@
+/*============================================================================
+
+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 "specialize.h"
+#include "softfloat.h"
+
+float32 f32_range(float32 a, float32 b, bool is_max, bool is_abs, int sign_ctrl, struct softfloat_status_t *status)
+{
+    bool signA;
+    int16_t expA;
+    uint32_t sigA;
+    bool signB;
+    int16_t expB;
+    uint32_t sigB;
+    bool aIsNaN, bIsNaN;
+    uint32_t z;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    signA = signF32UI(a);
+    expA  = expF32UI(a);
+    sigA  = fracF32UI(a);
+    signB = signF32UI(b);
+    expB  = expF32UI(b);
+    sigB  = fracF32UI(b);
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if (softfloat_isSigNaNF32UI(a)) {
+        return softfloat_propagateNaNF32UI(a, 0, status);
+    }
+    if (softfloat_isSigNaNF32UI(b)) {
+        return softfloat_propagateNaNF32UI(b, 0, status);
+    }
+
+    aIsNaN = isNaNF32UI(a);
+    bIsNaN = isNaNF32UI(b);
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if (! expA && sigA) {
+        if (softfloat_denormalsAreZeros(status)) {
+            a = packToF32UI(signA, 0, 0);
+        }
+        else if (! bIsNaN) {
+            softfloat_raiseFlags(status, softfloat_flag_denormal);
+        }
+    }
+
+    if (! expB && sigB) {
+        if (softfloat_denormalsAreZeros(status)) {
+            b = packToF32UI(signB, 0, 0);
+        }
+        else if (! aIsNaN) {
+            softfloat_raiseFlags(status, softfloat_flag_denormal);
+        }
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if (bIsNaN) {
+        z = a;
+    }
+    else if (aIsNaN) {
+        z = b;
+    }
+    else if (signA != signB && ! is_abs) {
+        if (! is_max) {
+            z = signA ? a : b;
+        } else {
+            z = signA ? b : a;
+        }
+    } else {
+        float32 tmp_a = a, tmp_b = b;
+        if (is_abs) {
+            tmp_a = tmp_a & ~0x80000000; // clear the sign bit
+            tmp_b = tmp_b & ~0x80000000;
+            signA = 0;
+        }
+        if (! is_max) {
+            z = (signA ^ (tmp_a < tmp_b)) ? a : b;
+        } else {
+            z = (signA ^ (tmp_a < tmp_b)) ? b : a;
+        }
+    }
+
+    switch(sign_ctrl) {
+    case 0:
+        z = (z & ~0x80000000) | (a & 0x80000000); // keep sign of a
+        break;
+    case 1:
+        break; // preserve sign of compare result
+    case 2:
+        z = z & ~0x80000000; // zero out the sign bit
+        break;
+    case 3:
+        z = z | 0x80000000;  // set the sign bit
+        break;
+    }
+
+    return z;
+}