[sim] integrated SoftFloat-3 with ISA sim; removed SoftFloat-2b

[riscv-isa-sim.git] / softfloat / s_roundPackToI32.cc

diff --git a/softfloat/s_roundPackToI32.cc b/softfloat/s_roundPackToI32.cc
new file mode 100755 (executable)
index 0000000..1c91497
--- /dev/null
+++ b/softfloat/s_roundPackToI32.cc
@@ -0,0 +1,48 @@
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "softfloat.h"
+
+int_fast32_t
+ softfloat_roundPackToI32(
+     bool sign, uint_fast64_t sig, int_fast8_t roundingMode, bool exact )
+{
+    bool roundNearestEven;
+    int roundIncrement, roundBits;
+    uint_fast32_t sig32;
+    union { uint32_t ui; int32_t i; } uZ;
+    int_fast32_t z;
+
+    roundNearestEven = ( roundingMode == softfloat_round_nearest_even );
+    roundIncrement = 0x40;
+    if (
+           ! roundNearestEven
+        && ( roundingMode != softfloat_round_nearest_maxMag )
+    ) {
+        roundIncrement =
+               ( roundingMode == softfloat_round_minMag )
+            || ( roundingMode
+                     == ( sign ? softfloat_round_max : softfloat_round_min ) )
+                ? 0
+                : 0x7F;
+    }
+    roundBits = sig & 0x7F;
+    sig += roundIncrement;
+    if ( sig & UINT64_C( 0xFFFFFF8000000000 ) ) goto invalid;
+    sig32 = sig>>7;
+    sig32 &= ~ ( ! ( roundBits ^ 0x40 ) & roundNearestEven );
+    uZ.ui = sign ? - sig32 : sig32;
+    z = uZ.i;
+    if ( z && ( ( z < 0 ) ^ sign ) ) goto invalid;
+    if ( exact && roundBits ) {
+        softfloat_exceptionFlags |= softfloat_flag_inexact;
+    }
+    return z;
+ invalid:
+    softfloat_raiseFlags( softfloat_flag_invalid );
+    return sign ? -0x7FFFFFFF - 1 : 0x7FFFFFFF;
+
+}
+