diff options
Diffstat (limited to 'softfloat/s_countLeadingZeros64.c')
-rwxr-xr-x | softfloat/s_countLeadingZeros64.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/softfloat/s_countLeadingZeros64.c b/softfloat/s_countLeadingZeros64.c new file mode 100755 index 0000000..79f4280 --- /dev/null +++ b/softfloat/s_countLeadingZeros64.c @@ -0,0 +1,32 @@ + +#include <stdint.h> +#include "primitives.h" +#include "platform.h" + +int softfloat_countLeadingZeros64( uint64_t a ) +{ + int count; + uint32_t a32; + + count = 32; + a32 = a; + if ( UINT64_C( 0x100000000 ) <= a ) { + count = 0; + a32 = a>>32; + } + /*------------------------------------------------------------------------ + | 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; + +} + |