461520d0ab
* Add all softfloat source files without any change.
* Remove useless file softfloat.mk.in, since gem5 use Scons.
* Add `use_fast_int64` in SConscript to distinguish src of two strategies for data
larger than 64 bits.
* The SoftFloat library uses two strategies to handle data larger than 64bit. One is
spliting data into `fast_int64`, and the other is using pointer. Two strategies
are distinguished by macro `SOFTFLOAT_FAST_INT64`. But not all "*.c" files are
guarded by this macro, which leads to including useless files in compiling progress
and compiling error. `use_fast_int64` used in SConscript can exclude unnecessary
files.
Change-Id: I7cec10412c00a35c247299cd92d83cdee9066410
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/66552
Maintainer: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: Hoa Nguyen <hoanguyen@ucdavis.edu>
38 lines
1.2 KiB
C
Executable File
38 lines
1.2 KiB
C
Executable File
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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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