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[riscv-isa-sim.git] / softfloat / s_roundPackToI64.c

diff --git a/softfloat/s_roundPackToI64.c b/softfloat/s_roundPackToI64.c
old mode 100755 (executable)
new mode 100644 (file)
index b2f5d63..ebef7f3
--- a/softfloat/s_roundPackToI64.c
+++ b/softfloat/s_roundPackToI64.c
@@ -1,52 +1,89 @@
 
+/*============================================================================
+
+This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
+Package, Release 3a+, 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 "platform.h"
 #include "internals.h"
+#include "specialize.h"
 #include "softfloat.h"
 
 int_fast64_t
  softfloat_roundPackToI64(
      bool sign,
-     uint_fast64_t sig64,
-     uint_fast64_t sig0,
-     int_fast8_t roundingMode,
+     uint_fast64_t sig,
+     uint_fast64_t sigExtra,
+     uint_fast8_t roundingMode,
      bool exact
  )
 {
-    bool roundNearestEven, increment;
+    bool roundNearEven, doIncrement;
     union { uint64_t ui; int64_t i; } uZ;
     int_fast64_t z;
 
-    roundNearestEven = ( roundingMode == softfloat_round_nearest_even );
-    increment = ( UINT64_C( 0x8000000000000000 ) <= sig0 );
-    if (
-           ! roundNearestEven
-        && ( roundingMode != softfloat_round_nearest_maxMag )
-    ) {
-        increment =
-               ( roundingMode != softfloat_round_minMag )
-            && ( roundingMode
-                     == ( sign ? softfloat_round_min : softfloat_round_max ) )
-            && sig0;
+    /*------------------------------------------------------------------------
+    *------------------------------------------------------------------------*/
+    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 ( increment ) {
-        ++sig64;
-        if ( ! sig64 ) goto invalid;
-        sig64 &=
-            ~ ( ! ( sig0 & UINT64_C( 0x7FFFFFFFFFFFFFFF ) )
-                    & roundNearestEven );
+    if ( doIncrement ) {
+        ++sig;
+        if ( ! sig ) goto invalid;
+        sig &=
+            ~(uint_fast64_t)
+                 (! (sigExtra & UINT64_C( 0x7FFFFFFFFFFFFFFF ))
+                      & roundNearEven);
     }
-    uZ.ui = sign ? - sig64 : sig64;
+    uZ.ui = sign ? -sig : sig;
     z = uZ.i;
-    if ( z && ( ( z < 0 ) ^ sign ) ) goto invalid;
-    if ( exact && sig0 ) softfloat_exceptionFlags |= softfloat_flag_inexact;
+    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 );
+    return sign ? i64_fromNegOverflow : i64_fromPosOverflow;
 
 }