From 8f59d925353145a65c09301dea6c47da1f1311b1 Mon Sep 17 00:00:00 2001
From: John Hauser <jhauser@eecs.berkeley.edu>
Date: Fri, 28 Nov 2014 19:49:28 -0800
Subject: First draft of RC for Release 3, to start review process.

---
 source/s_roundPackToI64.c | 81 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 source/s_roundPackToI64.c

(limited to 'source/s_roundPackToI64.c')

diff --git a/source/s_roundPackToI64.c b/source/s_roundPackToI64.c
new file mode 100644
index 0000000..dca0778
--- /dev/null
+++ b/source/s_roundPackToI64.c
@@ -0,0 +1,81 @@
+
+/*============================================================================
+
+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 "softfloat.h"
+
+int_fast64_t
+ softfloat_roundPackToI64(
+     bool sign,
+     uint_fast64_t sig,
+     uint_fast64_t sigExtra,
+     uint_fast8_t roundingMode,
+     bool exact
+ )
+{
+    bool roundNearEven, doIncrement;
+    union { uint64_t ui; int64_t i; } uZ;
+    int_fast64_t z;
+
+    roundNearEven = (roundingMode == softfloat_round_near_even);
+    doIncrement = (UINT64_C( 0x8000000000000000 ) <= sigExtra);
+    if ( ! roundNearEven && (roundingMode != softfloat_round_near_maxMag) ) {
+        doIncrement =
+            (roundingMode
+                 == (sign ? softfloat_round_min : softfloat_round_max))
+                && sigExtra;
+    }
+    if ( doIncrement ) {
+        ++sig;
+        if ( ! sig ) goto invalid;
+        sig &=
+            ~(! (sigExtra & UINT64_C( 0x7FFFFFFFFFFFFFFF )) & roundNearEven);
+    }
+    uZ.ui = sign ? -sig : sig;
+    z = uZ.i;
+    if ( z && ((z < 0) ^ sign) ) goto invalid;
+    if ( exact && sigExtra ) {
+        softfloat_exceptionFlags |= softfloat_flag_inexact;
+    }
+    return z;
+ invalid:
+    softfloat_raiseFlags( softfloat_flag_invalid );
+    return
+        sign ? -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1
+            : INT64_C( 0x7FFFFFFFFFFFFFFF );
+
+}
+
-- 
cgit v1.1