target/m68k: define floatx80_move()

This functions is needed by upcoming m68k softfloat functions.

Source code copied for WinUAE (tag 3500)
(The WinUAE file has been copied from QEMU and has
the QEMU licensing notice)

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180305203910.10391-2-laurent@vivier.eu>

diff --git a/target/m68k/softfloat.c b/target/m68k/softfloat.c
index 9cb141900c5494a759ae98b3716073d44d54b23e..55eb7a260a1b9d533c37e597e227d5179531b3d9 100644 (file)
--- a/target/m68k/softfloat.c
+++ b/target/m68k/softfloat.c
@@ -247,3 +247,30 @@ floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status)
     return roundAndPackFloatx80(status->floatx80_rounding_precision,
                                 aSign, aExp, aSig, 0, status);
 }
+
+floatx80 floatx80_move(floatx80 a, float_status *status)
+{
+    flag aSign;
+    int32_t aExp;
+    uint64_t aSig;
+
+    aSig = extractFloatx80Frac(a);
+    aExp = extractFloatx80Exp(a);
+    aSign = extractFloatx80Sign(a);
+
+    if (aExp == 0x7FFF) {
+        if ((uint64_t)(aSig << 1)) {
+            return propagateFloatx80NaNOneArg(a, status);
+        }
+        return a;
+    }
+    if (aExp == 0) {
+        if (aSig == 0) {
+            return a;
+        }
+        normalizeRoundAndPackFloatx80(status->floatx80_rounding_precision,
+                                      aSign, aExp, aSig, 0, status);
+    }
+    return roundAndPackFloatx80(status->floatx80_rounding_precision, aSign,
+                                aExp, aSig, 0, status);
+}

diff --git a/target/m68k/softfloat.h b/target/m68k/softfloat.h
index 78fbc0cd0cac02adf8f01cb031b55ef8a7dc0b02..18561b870dc59994582e0e7db464653ff3929bde 100644 (file)
--- a/target/m68k/softfloat.h
+++ b/target/m68k/softfloat.h
@@ -26,4 +26,5 @@ floatx80 floatx80_mod(floatx80 a, floatx80 b, float_status *status);
 floatx80 floatx80_getman(floatx80 a, float_status *status);
 floatx80 floatx80_getexp(floatx80 a, float_status *status);
 floatx80 floatx80_scale(floatx80 a, floatx80 b, float_status *status);
+floatx80 floatx80_move(floatx80 a, float_status *status);
 #endif