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

[riscv-isa-sim.git] / softfloat / f32_roundToInt.cc

diff --git a/softfloat/f32_roundToInt.cc b/softfloat/f32_roundToInt.cc
new file mode 100755 (executable)
index 0000000..f8f9114
--- /dev/null
+++ b/softfloat/f32_roundToInt.cc
@@ -0,0 +1,78 @@
+
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+float32_t f32_roundToInt( float32_t a, int_fast8_t roundingMode, bool exact )
+{
+    union ui32_f32 uA;
+    uint_fast32_t uiA;
+    int_fast16_t expA;
+    uint_fast32_t uiZ;
+    bool signA;
+    uint_fast32_t lastBitMask, roundBitsMask;
+    union ui32_f32 uZ;
+
+    uA.f = a;
+    uiA = uA.ui;
+    expA = expF32UI( uiA );
+    if ( 0x96 <= expA ) {
+        if ( ( expA == 0xFF ) && fracF32UI( uiA ) ) {
+            uiZ = softfloat_propagateNaNF32UI( uiA, 0 );
+            goto uiZ;
+        }
+        return a;
+    }
+    if ( expA <= 0x7E ) {
+        if ( ! (uint32_t) ( uiA<<1 ) ) return a;
+        if ( exact ) softfloat_exceptionFlags |= softfloat_flag_inexact;
+        signA = signF32UI( uiA );
+        switch ( roundingMode ) {
+         case softfloat_round_nearest_even:
+            if ( ( expA == 0x7E ) && fracF32UI( uiA ) ) {
+                uiZ = packToF32UI( signA, 0x7F, 0 );
+                goto uiZ;
+            }
+            break;
+         case softfloat_round_min:
+            uiZ = signA ? 0xBF800000 : 0;
+            goto uiZ;
+         case softfloat_round_max:
+            uiZ = signA ? 0x80000000 : 0x3F800000;
+            goto uiZ;
+         case softfloat_round_nearest_maxMag:
+            if ( expA == 0x7E ) {
+                uiZ = packToF32UI( signA, 0x7F, 0 );
+                goto uiZ;
+            }
+            break;
+        }
+        uiZ = packToF32UI( signA, 0, 0 );
+        goto uiZ;
+    }
+    lastBitMask = (uint_fast32_t) 1<<( 0x96 - expA );
+    roundBitsMask = lastBitMask - 1;
+    uiZ = uiA;
+    if ( roundingMode == softfloat_round_nearest_maxMag ) {
+        uiZ += lastBitMask>>1;
+    } else if ( roundingMode == softfloat_round_nearest_even ) {
+        uiZ += lastBitMask>>1;
+        if ( ! ( uiZ & roundBitsMask ) ) uiZ &= ~ lastBitMask;
+    } else if ( roundingMode != softfloat_round_minMag ) {
+        if ( signF32UI( uiZ ) ^ ( roundingMode == softfloat_round_max ) ) {
+            uiZ += roundBitsMask;
+        }
+    }
+    uiZ &= ~ roundBitsMask;
+    if ( exact && ( uiZ != uiA ) ) {
+        softfloat_exceptionFlags |= softfloat_flag_inexact;
+    }
+ uiZ:
+    uZ.ui = uiZ;
+    return uZ.f;
+
+}
+