aboutsummaryrefslogtreecommitdiff
path: root/softfloat/i64_to_f128.c
diff options
context:
space:
mode:
Diffstat (limited to 'softfloat/i64_to_f128.c')
-rw-r--r--softfloat/i64_to_f128.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/softfloat/i64_to_f128.c b/softfloat/i64_to_f128.c
new file mode 100644
index 0000000..a2b6dea
--- /dev/null
+++ b/softfloat/i64_to_f128.c
@@ -0,0 +1,72 @@
+
+/*============================================================================
+
+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 <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "softfloat.h"
+
+float128_t i64_to_f128( int64_t a )
+{
+ uint_fast64_t uiZ64, uiZ0;
+ bool sign;
+ uint_fast64_t absA;
+ int_fast8_t shiftDist;
+ struct uint128 zSig;
+ union ui128_f128 uZ;
+
+ if ( ! a ) {
+ uiZ64 = 0;
+ uiZ0 = 0;
+ } else {
+ sign = (a < 0);
+ absA = sign ? -(uint_fast64_t) a : (uint_fast64_t) a;
+ shiftDist = softfloat_countLeadingZeros64( absA ) + 49;
+ if ( 64 <= shiftDist ) {
+ zSig.v64 = absA<<(shiftDist - 64);
+ zSig.v0 = 0;
+ } else {
+ zSig = softfloat_shortShiftLeft128( 0, absA, shiftDist );
+ }
+ uiZ64 = packToF128UI64( sign, 0x406E - shiftDist, zSig.v64 );
+ uiZ0 = zSig.v0;
+ }
+ uZ.ui.v64 = uiZ64;
+ uZ.ui.v0 = uiZ0;
+ return uZ.f;
+
+}
+