Upgrade to softfloat3e.

This should solve licensing problems as well.
2024-06-09 23:08:46 +02:00
parent 4b77ef6823
commit 0f29bcddf1
271 changed files with 25882 additions and 10441 deletions
--- a/src/cpu/softfloat3e/f32_getMant.c
+++ b/src/cpu/softfloat3e/f32_getMant.c
@@ -0,0 +1,108 @@
+/*============================================================================
+
+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"
+
+/*----------------------------------------------------------------------------
+| Extracts the mantissa of single-precision floating-point value 'a' and
+| returns the result as a single-precision floating-point after applying
+| the mantissa interval normalization and sign control. The operation is
+| performed according to the IEC/IEEE Standard for Binary Floating-Point
+| Arithmetic.
+*----------------------------------------------------------------------------*/
+
+float32 f32_getMant(float32 a, struct softfloat_status_t *status, int sign_ctrl, int interv)
+{
+    bool signA;
+    int16_t expA;
+    uint32_t sigA;
+    struct exp16_sig32 normExpSig;
+
+    signA = signF32UI(a);
+    expA  = expF32UI(a);
+    sigA  = fracF32UI(a);
+
+    if (expA == 0xFF) {
+        if (sigA) return softfloat_propagateNaNF32UI(a, 0, status);
+        if (signA) {
+            if (sign_ctrl & 0x2) {
+                softfloat_raiseFlags(status, softfloat_flag_invalid);
+                return defaultNaNF32UI;
+            }
+        }
+        return packToF32UI(~sign_ctrl & signA, 0x7F, 0);
+    }
+
+    if (! expA && (! sigA || softfloat_denormalsAreZeros(status))) {
+        return packToF32UI(~sign_ctrl & signA, 0x7F, 0);
+    }
+
+    if (signA) {
+        if (sign_ctrl & 0x2) {
+            softfloat_raiseFlags(status, softfloat_flag_invalid);
+            return defaultNaNF32UI;
+        }
+    }
+
+    if (! expA) {
+        softfloat_raiseFlags(status, softfloat_flag_denormal);
+        normExpSig = softfloat_normSubnormalF32Sig(sigA);
+        expA = normExpSig.exp;
+        sigA = normExpSig.sig;
+        sigA &= 0x7FFFFF;
+    }
+
+    switch(interv) {
+    case 0x0: // interval [1,2)
+        expA = 0x7F;
+        break;
+    case 0x1: // interval [1/2,2)
+        expA -= 0x7F;
+        expA  = 0x7F - (expA & 0x1);
+        break;
+    case 0x2: // interval [1/2,1)
+        expA = 0x7E;
+        break;
+    case 0x3: // interval [3/4,3/2)
+        expA = 0x7F - ((sigA >> 22) & 0x1);
+        break;
+    }
+
+    return packToF32UI(~sign_ctrl & signA, expA, sigA);
+}