3a9d0de609
This patch adds Softfloat library for supporting RISCV float operation implement. Using SoftFloat Package to reinplement Riscv FPops. Jira Issue: https://gem5.atlassian.net/browse/GEM5-373 Change-Id: Ic96e6c8adec0713bdbd744d581c750034b88246c Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39357 Reviewed-by: Bobby R. Bruce <bbruce@ucdavis.edu> Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu> Tested-by: kokoro <noreply+kokoro@google.com>
38 lines
1.1 KiB
C
Executable File
38 lines
1.1 KiB
C
Executable File
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#include <stdbool.h>
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#include <stdint.h>
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#include "internals.h"
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#include "platform.h"
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#include "softfloat.h"
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#include "specialize.h"
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uint_fast16_t f64_classify( float64_t a )
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{
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union ui64_f64 uA;
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uint_fast64_t uiA;
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uA.f = a;
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uiA = uA.ui;
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uint_fast16_t infOrNaN = expF64UI( uiA ) == 0x7FF;
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uint_fast16_t subnormalOrZero = expF64UI( uiA ) == 0;
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bool sign = signF64UI( uiA );
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bool fracZero = fracF64UI( uiA ) == 0;
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bool isNaN = isNaNF64UI( uiA );
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bool isSNaN = softfloat_isSigNaNF64UI( 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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