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| author | Andrew Waterman <waterman@s141.Millennium.Berkeley.EDU> | 2011-06-19 21:45:58 -0700 |
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| committer | Andrew Waterman <waterman@s141.Millennium.Berkeley.EDU> | 2011-06-19 21:45:58 -0700 |
| commit | 1e163c715550e20e239976a22e00869884713e54 (patch) | |
| tree | dbcf7b10e35421c72758df098057014fef7ffff7 /softfloat/s_countLeadingZeros64.c | |
| parent | 0edaecc54329048eb91ad6a45338265ef1a4569c (diff) | |
| download | riscv-pk-1e163c715550e20e239976a22e00869884713e54.zip riscv-pk-1e163c715550e20e239976a22e00869884713e54.tar.gz riscv-pk-1e163c715550e20e239976a22e00869884713e54.tar.bz2 | |
fixed build after repo split
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; + +} + |