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>
37 lines
1.1 KiB
C
Executable File
37 lines
1.1 KiB
C
Executable File
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include "platform.h"
|
|
#include "internals.h"
|
|
#include "specialize.h"
|
|
#include "softfloat.h"
|
|
|
|
uint_fast16_t f64_classify( float64_t a )
|
|
{
|
|
union ui64_f64 uA;
|
|
uint_fast64_t uiA;
|
|
|
|
uA.f = a;
|
|
uiA = uA.ui;
|
|
|
|
uint_fast16_t infOrNaN = expF64UI( uiA ) == 0x7FF;
|
|
uint_fast16_t subnormalOrZero = expF64UI( uiA ) == 0;
|
|
bool sign = signF64UI( uiA );
|
|
bool fracZero = fracF64UI( uiA ) == 0;
|
|
bool isNaN = isNaNF64UI( uiA );
|
|
bool isSNaN = softfloat_isSigNaNF64UI( 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;
|
|
}
|
|
|