/*
* QEMU float support macros
*
- * Derived from SoftFloat.
+ * The code in this source file is derived from release 2a of the SoftFloat
+ * IEC/IEEE Floating-point Arithmetic Package. Those parts of the code (and
+ * some later contributions) are provided under that license, as detailed below.
+ * It has subsequently been modified by contributors to the QEMU Project,
+ * so some portions are provided under:
+ * the SoftFloat-2a license
+ * the BSD license
+ * GPL-v2-or-later
+ *
+ * Any future contributions to this file after December 1st 2014 will be
+ * taken to be licensed under the Softfloat-2a license unless specifically
+ * indicated otherwise.
*/
-/*============================================================================
-
+/*
+===============================================================================
This C source fragment is part of the SoftFloat IEC/IEEE Floating-point
-Arithmetic Package, Release 2b.
+Arithmetic Package, Release 2a.
Written by John R. Hauser. This work was made possible in part by the
International Computer Science Institute, located at Suite 600, 1947 Center
of this code was written as part of a project to build a fixed-point vector
processor in collaboration with the University of California at Berkeley,
overseen by Profs. Nelson Morgan and John Wawrzynek. More information
-is available through the Web page `http://www.cs.berkeley.edu/~jhauser/
+is available through the Web page `http://HTTP.CS.Berkeley.EDU/~jhauser/
arithmetic/SoftFloat.html'.
-THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort has
-been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT TIMES
-RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO PERSONS
-AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ALL LOSSES,
-COSTS, OR OTHER PROBLEMS THEY INCUR DUE TO THE SOFTWARE, AND WHO FURTHERMORE
-EFFECTIVELY INDEMNIFY JOHN HAUSER AND THE INTERNATIONAL COMPUTER SCIENCE
-INSTITUTE (possibly via similar legal notice) AGAINST ALL LOSSES, COSTS, OR
-OTHER PROBLEMS INCURRED BY THEIR CUSTOMERS AND CLIENTS DUE TO THE SOFTWARE.
+THIS SOFTWARE IS DISTRIBUTED AS IS, FOR FREE. Although reasonable effort
+has been made to avoid it, THIS SOFTWARE MAY CONTAIN FAULTS THAT WILL AT
+TIMES RESULT IN INCORRECT BEHAVIOR. USE OF THIS SOFTWARE IS RESTRICTED TO
+PERSONS AND ORGANIZATIONS WHO CAN AND WILL TAKE FULL RESPONSIBILITY FOR ANY
+AND ALL LOSSES, COSTS, OR OTHER PROBLEMS ARISING FROM ITS USE.
Derivative works are acceptable, even for commercial purposes, so long as
-(1) the source code for the derivative work includes prominent notice that
-the work is derivative, and (2) the source code includes prominent notice with
-these four paragraphs for those parts of this code that are retained.
+(1) they include prominent notice that the work is derivative, and (2) they
+include prominent notice akin to these four paragraphs for those parts of
+this code that are retained.
+
+===============================================================================
+*/
+
+/* BSD licensing:
+ * Copyright (c) 2006, Fabrice Bellard
+ * 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 copyright holder 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ */
+
+/* Portions of this work are licensed under the terms of the GNU GPL,
+ * version 2 or later. See the COPYING file in the top-level directory.
+ */
+
+/*----------------------------------------------------------------------------
+| This macro tests for minimum version of the GNU C compiler.
+*----------------------------------------------------------------------------*/
+#if defined(__GNUC__) && defined(__GNUC_MINOR__)
+# define SOFTFLOAT_GNUC_PREREQ(maj, min) \
+ ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+#else
+# define SOFTFLOAT_GNUC_PREREQ(maj, min) 0
+#endif
-=============================================================================*/
/*----------------------------------------------------------------------------
| Shifts `a' right by the number of bits given in `count'. If any nonzero
| The result is stored in the location pointed to by `zPtr'.
*----------------------------------------------------------------------------*/
-INLINE void shift32RightJamming( uint32_t a, int16 count, uint32_t *zPtr )
+static inline void shift32RightJamming(uint32_t a, int count, uint32_t *zPtr)
{
uint32_t z;
| The result is stored in the location pointed to by `zPtr'.
*----------------------------------------------------------------------------*/
-INLINE void shift64RightJamming( uint64_t a, int16 count, uint64_t *zPtr )
+static inline void shift64RightJamming(uint64_t a, int count, uint64_t *zPtr)
{
uint64_t z;
| 63 bits of the extra result are all zero if and only if _all_but_the_last_
| bits shifted off were all zero. This extra result is stored in the location
| pointed to by `z1Ptr'. The value of `count' can be arbitrarily large.
-| (This routine makes more sense if `a0' and `a1' are considered to form
-| a fixed-point value with binary point between `a0' and `a1'. This fixed-
-| point value is shifted right by the number of bits given in `count', and
-| the integer part of the result is returned at the location pointed to by
+| (This routine makes more sense if `a0' and `a1' are considered to form a
+| fixed-point value with binary point between `a0' and `a1'. This fixed-point
+| value is shifted right by the number of bits given in `count', and the
+| integer part of the result is returned at the location pointed to by
| `z0Ptr'. The fractional part of the result may be slightly corrupted as
| described above, and is returned at the location pointed to by `z1Ptr'.)
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
shift64ExtraRightJamming(
- uint64_t a0, uint64_t a1, int16 count, uint64_t *z0Ptr, uint64_t *z1Ptr )
+ uint64_t a0, uint64_t a1, int count, uint64_t *z0Ptr, uint64_t *z1Ptr)
{
uint64_t z0, z1;
- int8 negCount = ( - count ) & 63;
+ int8_t negCount = ( - count ) & 63;
if ( count == 0 ) {
z1 = a1;
| which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
shift128Right(
- uint64_t a0, uint64_t a1, int16 count, uint64_t *z0Ptr, uint64_t *z1Ptr )
+ uint64_t a0, uint64_t a1, int count, uint64_t *z0Ptr, uint64_t *z1Ptr)
{
uint64_t z0, z1;
- int8 negCount = ( - count ) & 63;
+ int8_t negCount = ( - count ) & 63;
if ( count == 0 ) {
z1 = a1;
z0 = a0>>count;
}
else {
- z1 = ( count < 64 ) ? ( a0>>( count & 63 ) ) : 0;
+ z1 = (count < 128) ? (a0 >> (count & 63)) : 0;
z0 = 0;
}
*z1Ptr = z1;
| the locations pointed to by `z0Ptr' and `z1Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
shift128RightJamming(
- uint64_t a0, uint64_t a1, int16 count, uint64_t *z0Ptr, uint64_t *z1Ptr )
+ uint64_t a0, uint64_t a1, int count, uint64_t *z0Ptr, uint64_t *z1Ptr)
{
uint64_t z0, z1;
- int8 negCount = ( - count ) & 63;
+ int8_t negCount = ( - count ) & 63;
if ( count == 0 ) {
z1 = a1;
| `z2Ptr'.)
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
shift128ExtraRightJamming(
uint64_t a0,
uint64_t a1,
uint64_t a2,
- int16 count,
+ int count,
uint64_t *z0Ptr,
uint64_t *z1Ptr,
uint64_t *z2Ptr
)
{
uint64_t z0, z1, z2;
- int8 negCount = ( - count ) & 63;
+ int8_t negCount = ( - count ) & 63;
if ( count == 0 ) {
z2 = a2;
| pieces which are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
shortShift128Left(
- uint64_t a0, uint64_t a1, int16 count, uint64_t *z0Ptr, uint64_t *z1Ptr )
+ uint64_t a0, uint64_t a1, int count, uint64_t *z0Ptr, uint64_t *z1Ptr)
{
*z1Ptr = a1<<count;
| `z1Ptr', and `z2Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
shortShift192Left(
uint64_t a0,
uint64_t a1,
uint64_t a2,
- int16 count,
+ int count,
uint64_t *z0Ptr,
uint64_t *z1Ptr,
uint64_t *z2Ptr
)
{
uint64_t z0, z1, z2;
- int8 negCount;
+ int8_t negCount;
z2 = a2<<count;
z1 = a1<<count;
| are stored at the locations pointed to by `z0Ptr' and `z1Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
add128(
uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1, uint64_t *z0Ptr, uint64_t *z1Ptr )
{
| `z1Ptr', and `z2Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
add192(
uint64_t a0,
uint64_t a1,
)
{
uint64_t z0, z1, z2;
- int8 carry0, carry1;
+ int8_t carry0, carry1;
z2 = a2 + b2;
carry1 = ( z2 < a2 );
| `z1Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
sub128(
uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1, uint64_t *z0Ptr, uint64_t *z1Ptr )
{
| pointed to by `z0Ptr', `z1Ptr', and `z2Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
sub192(
uint64_t a0,
uint64_t a1,
)
{
uint64_t z0, z1, z2;
- int8 borrow0, borrow1;
+ int8_t borrow0, borrow1;
z2 = a2 - b2;
borrow1 = ( a2 < b2 );
| `z0Ptr' and `z1Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void mul64To128( uint64_t a, uint64_t b, uint64_t *z0Ptr, uint64_t *z1Ptr )
+static inline void mul64To128( uint64_t a, uint64_t b, uint64_t *z0Ptr, uint64_t *z1Ptr )
{
uint32_t aHigh, aLow, bHigh, bLow;
uint64_t z0, zMiddleA, zMiddleB, z1;
| `z2Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
mul128By64To192(
uint64_t a0,
uint64_t a1,
| the locations pointed to by `z0Ptr', `z1Ptr', `z2Ptr', and `z3Ptr'.
*----------------------------------------------------------------------------*/
-INLINE void
+static inline void
mul128To256(
uint64_t a0,
uint64_t a1,
| value.
*----------------------------------------------------------------------------*/
-static uint32_t estimateSqrt32( int16 aExp, uint32_t a )
+static uint32_t estimateSqrt32(int aExp, uint32_t a)
{
static const uint16_t sqrtOddAdjustments[] = {
0x0004, 0x0022, 0x005D, 0x00B1, 0x011D, 0x019F, 0x0236, 0x02E0,
0x0A2D, 0x08AF, 0x075A, 0x0629, 0x051A, 0x0429, 0x0356, 0x029E,
0x0200, 0x0179, 0x0109, 0x00AF, 0x0068, 0x0034, 0x0012, 0x0002
};
- int8 index;
+ int8_t index;
uint32_t z;
index = ( a>>27 ) & 15;
| `a'. If `a' is zero, 32 is returned.
*----------------------------------------------------------------------------*/
-static int8 countLeadingZeros32( uint32_t a )
+static int8_t countLeadingZeros32( uint32_t a )
{
- static const int8 countLeadingZerosHigh[] = {
+#if SOFTFLOAT_GNUC_PREREQ(3, 4)
+ if (a) {
+ return __builtin_clz(a);
+ } else {
+ return 32;
+ }
+#else
+ static const int8_t countLeadingZerosHigh[] = {
8, 7, 6, 6, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4,
3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
- int8 shiftCount;
+ int8_t shiftCount;
shiftCount = 0;
if ( a < 0x10000 ) {
}
shiftCount += countLeadingZerosHigh[ a>>24 ];
return shiftCount;
-
+#endif
}
/*----------------------------------------------------------------------------
| `a'. If `a' is zero, 64 is returned.
*----------------------------------------------------------------------------*/
-static int8 countLeadingZeros64( uint64_t a )
+static int8_t countLeadingZeros64( uint64_t a )
{
- int8 shiftCount;
+#if SOFTFLOAT_GNUC_PREREQ(3, 4)
+ if (a) {
+ return __builtin_clzll(a);
+ } else {
+ return 64;
+ }
+#else
+ int8_t shiftCount;
shiftCount = 0;
if ( a < ( (uint64_t) 1 )<<32 ) {
}
shiftCount += countLeadingZeros32( a );
return shiftCount;
-
+#endif
}
/*----------------------------------------------------------------------------
| Otherwise, returns 0.
*----------------------------------------------------------------------------*/
-INLINE flag eq128( uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1 )
+static inline flag eq128( uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1 )
{
return ( a0 == b0 ) && ( a1 == b1 );
| Otherwise, returns 0.
*----------------------------------------------------------------------------*/
-INLINE flag le128( uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1 )
+static inline flag le128( uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1 )
{
return ( a0 < b0 ) || ( ( a0 == b0 ) && ( a1 <= b1 ) );
| returns 0.
*----------------------------------------------------------------------------*/
-INLINE flag lt128( uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1 )
+static inline flag lt128( uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1 )
{
return ( a0 < b0 ) || ( ( a0 == b0 ) && ( a1 < b1 ) );
| Otherwise, returns 0.
*----------------------------------------------------------------------------*/
-INLINE flag ne128( uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1 )
+static inline flag ne128( uint64_t a0, uint64_t a1, uint64_t b0, uint64_t b1 )
{
return ( a0 != b0 ) || ( a1 != b1 );
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