Add fclass.{s|d} instructions

[riscv-isa-sim.git] / softfloat / f32_classify.c

diff --git a/softfloat/f32_classify.c b/softfloat/f32_classify.c
new file mode 100755 (executable)
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;
+}
+