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37 lines
1.2 KiB
37 lines
1.2 KiB
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#include <stdbool.h>
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#include <stdint.h>
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#include "platform.h"
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#include "internals.h"
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#include "specialize.h"
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#include "softfloat.h"
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uint_fast16_t f128_classify( float128_t a )
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{
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union ui128_f128 uA;
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uint_fast64_t uiA64, uiA0;
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uA.f = a;
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uiA64 = uA.ui.v64;
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uiA0 = uA.ui.v0;
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uint_fast16_t infOrNaN = expF128UI64( uiA64 ) == 0x7FFF;
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uint_fast16_t subnormalOrZero = expF128UI64( uiA64 ) == 0;
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bool sign = signF128UI64( uiA64 );
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bool fracZero = fracF128UI64( uiA64 ) == 0 && uiA0 == 0;
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bool isNaN = isNaNF128UI( uiA64, uiA0 );
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bool isSNaN = softfloat_isSigNaNF128UI( uiA64, uiA0 );
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return
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( sign && infOrNaN && fracZero ) << 0 |
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( sign && !infOrNaN && !subnormalOrZero ) << 1 |
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( sign && subnormalOrZero && !fracZero ) << 2 |
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( sign && subnormalOrZero && fracZero ) << 3 |
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( !sign && infOrNaN && fracZero ) << 7 |
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( !sign && !infOrNaN && !subnormalOrZero ) << 6 |
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( !sign && subnormalOrZero && !fracZero ) << 5 |
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( !sign && subnormalOrZero && fracZero ) << 4 |
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( isNaN && isSNaN ) << 8 |
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( isNaN && !isSNaN ) << 9;
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}
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