First draft of RC for Release 3, to start review process.

1 files changed, 108 insertions, 0 deletions

diff --git a/source/f32_roundToInt.c b/source/f32_roundToInt.c
new file mode 100644
index 0000000..8bbf157
--- /dev/null
+++ b/source/f32_roundToInt.c
@@ -0,0 +1,108 @@
+
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3, by John R. Hauser.
+
+Copyright 2011, 2012, 2013, 2014 The Regents of the University of California
+(Regents).  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 two paragraphs of disclaimer.
+Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions, and the following two paragraphs of disclaimer in the
+documentation and/or other materials provided with the distribution.  Neither
+the name of the Regents nor the names of its contributors may be used to
+endorse or promote products derived from this software without specific prior
+written permission.
+
+IN NO EVENT SHALL REGENTS BE LIABLE TO ANY PARTY FOR DIRECT, INDIRECT,
+SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING LOST PROFITS, ARISING
+OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF REGENTS HAS
+BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+REGENTS SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE SOFTWARE AND ACCOMPANYING DOCUMENTATION, IF ANY, PROVIDED
+HEREUNDER IS PROVIDED "AS IS".  REGENTS HAS NO OBLIGATION TO PROVIDE
+MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+
+=============================================================================*/
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float32_t f32_roundToInt( float32_t a, uint_fast8_t roundingMode, bool exact )
+{
+    union ui32_f32 uA;
+    uint_fast32_t uiA;
+    int_fast16_t exp;
+    uint_fast32_t uiZ, lastBitMask, roundBitsMask;
+    union ui32_f32 uZ;
+
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uA.f = a;
+    uiA = uA.ui;
+    exp = expF32UI( uiA );
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( exp <= 0x7E ) {
+        if ( ! (uint32_t) (uiA<<1) ) return a;
+        if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
+        uiZ = uiA & packToF32UI( 1, 0, 0 );
+        switch ( roundingMode ) {
+         case softfloat_round_near_even:
+            if ( ! fracF32UI( uiA ) ) break;
+         case softfloat_round_near_maxMag:
+            if ( exp == 0x7E ) uiZ |= packToF32UI( 0, 0x7F, 0 );
+            break;
+         case softfloat_round_min:
+            if ( uiZ ) uiZ = packToF32UI( 1, 0x7F, 0 );
+            break;
+         case softfloat_round_max:
+            if ( ! uiZ ) uiZ = packToF32UI( 0, 0x7F, 0 );
+            break;
+        }
+        goto uiZ;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    if ( 0x96 <= exp ) {
+        if ( (exp == 0xFF) && fracF32UI( uiA ) ) {
+            uiZ = softfloat_propagateNaNF32UI( uiA, 0 );
+            goto uiZ;
+        }
+        return a;
+    }
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    uiZ = uiA;
+    lastBitMask = (uint_fast32_t) 1<<(0x96 - exp);
+    roundBitsMask = lastBitMask - 1;
+    if ( roundingMode == softfloat_round_near_maxMag ) {
+        uiZ += lastBitMask>>1;
+    } else if ( roundingMode == softfloat_round_near_even ) {
+        uiZ += lastBitMask>>1;
+        if ( ! (uiZ & roundBitsMask) ) uiZ &= ~lastBitMask;
+    } else if ( roundingMode != softfloat_round_minMag ) {
+        if ( signF32UI( uiZ ) ^ (roundingMode == softfloat_round_max) ) {
+            uiZ += roundBitsMask;
+        }
+    }
+    uiZ &= ~roundBitsMask;
+    if ( exact && (uiZ != uiA) ) {
+        softfloat_exceptionFlags |= softfloat_flag_inexact;
+    }
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+