diff options
| author | Han-Kuan Chen <hankuan.chen@sifive.com> | 2020-03-24 19:39:36 -0700 |
|---|---|---|
| committer | Chih-Min Chao <chihmin.chao@sifive.com> | 2020-05-04 09:50:05 -0700 |
| commit | 2b38341691cae78d1e06c9e80af1944d4c7aa0e5 (patch) | |
| tree | bb996497242425f1f21025f53c593c4cce744b52 /softfloat/f16_classify.c | |
| parent | b6432b1edf368b38661d00e0f2b7fe672d09bd72 (diff) | |
| download | spike-2b38341691cae78d1e06c9e80af1944d4c7aa0e5.zip spike-2b38341691cae78d1e06c9e80af1944d4c7aa0e5.tar.gz spike-2b38341691cae78d1e06c9e80af1944d4c7aa0e5.tar.bz2 | |
sf: fp16: add missing APIs
Signed-off-by: Chih-Min Chao <chihmin.chao@sifive.com>
Diffstat (limited to 'softfloat/f16_classify.c')
| -rwxr-xr-x | softfloat/f16_classify.c | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/softfloat/f16_classify.c b/softfloat/f16_classify.c new file mode 100755 index 0000000..9402ff1 --- /dev/null +++ b/softfloat/f16_classify.c @@ -0,0 +1,36 @@ + +#include <stdbool.h> +#include <stdint.h> +#include "platform.h" +#include "internals.h" +#include "specialize.h" +#include "softfloat.h" + +uint_fast16_t f16_classify( float16_t a ) +{ + union ui16_f16 uA; + uint_fast16_t uiA; + + uA.f = a; + uiA = uA.ui; + + uint_fast16_t infOrNaN = expF16UI( uiA ) == 0x1F; + uint_fast16_t subnormalOrZero = expF16UI( uiA ) == 0; + bool sign = signF16UI( uiA ); + bool fracZero = fracF16UI( uiA ) == 0; + bool isNaN = isNaNF16UI( uiA ); + bool isSNaN = softfloat_isSigNaNF16UI( uiA ); + + return + ( sign && infOrNaN && fracZero ) << 0 | + ( sign && !infOrNaN && !subnormalOrZero ) << 1 | + ( sign && subnormalOrZero && !fracZero ) << 2 | + ( sign && subnormalOrZero && fracZero ) << 3 | + ( !sign && infOrNaN && fracZero ) << 7 | + ( !sign && !infOrNaN && !subnormalOrZero ) << 6 | + ( !sign && subnormalOrZero && !fracZero ) << 5 | + ( !sign && subnormalOrZero && fracZero ) << 4 | + ( isNaN && isSNaN ) << 8 | + ( isNaN && !isSNaN ) << 9; +} + |