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https://github.com/riscv-software-src/riscv-isa-sim.git
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37 lines
1.1 KiB
C
37 lines
1.1 KiB
C
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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 bf16_classify( bfloat16_t a )
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{
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union ui16_f16 uA;
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uint_fast16_t uiA;
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uA.f = a;
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uiA = uA.ui;
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uint_fast16_t infOrNaN = expBF16UI( uiA ) == 0xFF;
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uint_fast16_t subnormalOrZero = expBF16UI( uiA ) == 0;
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bool sign = signBF16UI( uiA );
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bool fracZero = fracBF16UI( uiA ) == 0;
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bool isNaN = isNaNBF16UI( uiA );
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bool isSNaN = softfloat_isSigNaNBF16UI( uiA );
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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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