summaryrefslogtreecommitdiffstats
path: root/src/libs/softfloat-3e/source/s_countLeadingZeros64.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libs/softfloat-3e/source/s_countLeadingZeros64.c')
-rw-r--r--src/libs/softfloat-3e/source/s_countLeadingZeros64.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/src/libs/softfloat-3e/source/s_countLeadingZeros64.c b/src/libs/softfloat-3e/source/s_countLeadingZeros64.c
new file mode 100644
index 00000000..34745b12
--- /dev/null
+++ b/src/libs/softfloat-3e/source/s_countLeadingZeros64.c
@@ -0,0 +1,73 @@
+
+/*============================================================================
+
+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 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"
+
+#ifndef softfloat_countLeadingZeros64
+
+#define softfloat_countLeadingZeros64 softfloat_countLeadingZeros64
+#include "primitives.h"
+
+uint_fast8_t softfloat_countLeadingZeros64( uint64_t a )
+{
+ uint_fast8_t count;
+ uint32_t a32;
+
+ count = 0;
+ a32 = a>>32;
+ if ( ! a32 ) {
+ count = 32;
+ a32 = a;
+ }
+ /*------------------------------------------------------------------------
+ | From here, result is current count + count leading zeros of `a32'.
+ *------------------------------------------------------------------------*/
+ if ( a32 < 0x10000 ) {
+ count += 16;
+ a32 <<= 16;
+ }
+ if ( a32 < 0x1000000 ) {
+ count += 8;
+ a32 <<= 8;
+ }
+ count += softfloat_countLeadingZeros8[a32>>24];
+ return count;
+
+}
+
+#endif
+