[sim] made softfloat files C instead of C++

[riscv-isa-sim.git] / softfloat / s_roundPackToF64.c

diff --git a/softfloat/s_roundPackToF64.c b/softfloat/s_roundPackToF64.c
new file mode 100755 (executable)
index 0000000..fb0ef1d
--- /dev/null
+++ b/softfloat/s_roundPackToF64.c
@@ -0,0 +1,66 @@
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "primitives.h"
+#include "internals.h"
+#include "softfloat.h"
+
+float64_t
+ softfloat_roundPackToF64( bool sign, int_fast16_t exp, uint_fast64_t sig )
+{
+    int roundingMode;
+    bool roundNearestEven;
+    int roundIncrement, roundBits;
+    bool isTiny;
+    uint_fast64_t uiZ;
+    union ui64_f64 uZ;
+
+    roundingMode = softfloat_roundingMode;
+    roundNearestEven = ( roundingMode == softfloat_round_nearest_even );
+    roundIncrement = 0x200;
+    if (
+           ! roundNearestEven
+        && ( roundingMode != softfloat_round_nearest_maxMag )
+    ) {
+        roundIncrement =
+               ( roundingMode == softfloat_round_minMag )
+            || ( roundingMode
+                     == ( sign ? softfloat_round_max : softfloat_round_min ) )
+                ? 0
+                : 0x3FF;
+    }
+    roundBits = sig & 0x3FF;
+    if ( 0x7FD <= (uint16_t) exp ) {
+        if ( exp < 0 ) {
+            isTiny =
+                   ( softfloat_detectTininess
+                         == softfloat_tininess_beforeRounding )
+                || ( exp < -1 )
+                || ( sig + roundIncrement < UINT64_C( 0x8000000000000000 ) );
+            sig = softfloat_shift64RightJam( sig, - exp );
+            exp = 0;
+            roundBits = sig & 0x3FF;
+            if ( isTiny && roundBits ) {
+                softfloat_raiseFlags( softfloat_flag_underflow );
+            }
+        } else if (
+            ( 0x7FD < exp )
+                || ( UINT64_C( 0x8000000000000000 ) <= sig + roundIncrement )
+        ) {
+            softfloat_raiseFlags(
+                softfloat_flag_overflow | softfloat_flag_inexact );
+            uiZ = packToF64UI( sign, 0x7FF, 0 ) - ! roundIncrement;
+            goto uiZ;
+        }
+    }
+    if ( roundBits ) softfloat_exceptionFlags |= softfloat_flag_inexact;
+    sig = ( sig + roundIncrement )>>10;
+    sig &= ~ ( ! ( roundBits ^ 0x200 ) & roundNearestEven );
+    uiZ = packToF64UI( sign, sig ? exp : 0, sig );
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+