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authorAndrew Waterman <waterman@eecs.berkeley.edu>2014-03-06 18:49:41 -0800
committerAndrew Waterman <waterman@eecs.berkeley.edu>2014-03-06 18:49:41 -0800
commita43d87cf0ae16acff8763130f0c7e40014616cff (patch)
tree44cf0b2086be058f1d5eb0c6167adaab851bae9b /softfloat/f32_classify.c
parent07599f5833dcce1cf154b543da0cec46a0953c45 (diff)
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Add fclass.{s|d} instructions
Diffstat (limited to 'softfloat/f32_classify.c')
-rwxr-xr-xsoftfloat/f32_classify.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/softfloat/f32_classify.c b/softfloat/f32_classify.c
new file mode 100755
index 0000000..d16aa25
--- /dev/null
+++ b/softfloat/f32_classify.c
@@ -0,0 +1,33 @@
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+uint_fast16_t f32_classify( float32_t a )
+{
+ union ui32_f32 uA;
+ uint_fast32_t uiA;
+
+ uA.f = a;
+ uiA = uA.ui;
+
+ uint_fast16_t infOrNaN = expF32UI( uiA ) == 0xFF;
+ uint_fast16_t subnormalOrZero = expF32UI( uiA ) == 0;
+ bool sign = signF32UI( uiA );
+
+ return
+ ( sign && infOrNaN && fracF32UI( uiA ) == 0 ) << 0 |
+ ( sign && !infOrNaN && !subnormalOrZero ) << 1 |
+ ( sign && subnormalOrZero && fracF32UI( uiA ) ) << 2 |
+ ( sign && subnormalOrZero && fracF32UI( uiA ) == 0 ) << 3 |
+ ( !sign && infOrNaN && fracF32UI( uiA ) == 0 ) << 7 |
+ ( !sign && !infOrNaN && !subnormalOrZero ) << 6 |
+ ( !sign && subnormalOrZero && fracF32UI( uiA ) ) << 5 |
+ ( !sign && subnormalOrZero && fracF32UI( uiA ) == 0 ) << 4 |
+ ( isNaNF32UI( uiA ) && softfloat_isSigNaNF32UI( uiA )) << 8 |
+ ( isNaNF32UI( uiA ) && !softfloat_isSigNaNF32UI( uiA )) << 9;
+}
+