128-bit float support for user mode

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@3740 c046a42c-6fe2-441c-8c8c-71466251a162

2 files changed, 46 insertions, 0 deletions

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index e30f22f918..3ec1e0de18 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -5421,6 +5421,50 @@ int float ## s ## _compare_quiet( float ## s a, float ## s b STATUS_PARAM )  \
 COMPARE(32, 0xff)
 COMPARE(64, 0x7ff)
 
+INLINE int float128_compare_internal( float128 a, float128 b,
+                                      int is_quiet STATUS_PARAM )
+{
+    flag aSign, bSign;
+
+    if (( ( extractFloat128Exp( a ) == 0x7fff ) &&
+          ( extractFloat128Frac0( a ) | extractFloat128Frac1( a ) ) ) ||
+        ( ( extractFloat128Exp( b ) == 0x7fff ) &&
+          ( extractFloat128Frac0( b ) | extractFloat128Frac1( b ) ) )) {
+        if (!is_quiet ||
+            float128_is_signaling_nan( a ) ||
+            float128_is_signaling_nan( b ) ) {
+            float_raise( float_flag_invalid STATUS_VAR);
+        }
+        return float_relation_unordered;
+    }
+    aSign = extractFloat128Sign( a );
+    bSign = extractFloat128Sign( b );
+    if ( aSign != bSign ) {
+        if ( ( ( ( a.high | b.high )<<1 ) | a.low | b.low ) == 0 ) {
+            /* zero case */
+            return float_relation_equal;
+        } else {
+            return 1 - (2 * aSign);
+        }
+    } else {
+        if (a.low == b.low && a.high == b.high) {
+            return float_relation_equal;
+        } else {
+            return 1 - 2 * (aSign ^ ( lt128( a.high, a.low, b.high, b.low ) ));
+        }
+    }
+}
+
+int float128_compare( float128 a, float128 b STATUS_PARAM )
+{
+    return float128_compare_internal(a, b, 0 STATUS_VAR);
+}
+
+int float128_compare_quiet( float128 a, float128 b STATUS_PARAM )
+{
+    return float128_compare_internal(a, b, 1 STATUS_VAR);
+}
+
 /* Multiply A by 2 raised to the power N.  */
 float32 float32_scalbn( float32 a, int n STATUS_PARAM )
 {
diff --git a/fpu/softfloat.h b/fpu/softfloat.h
index 84cffdd5d5..5f95d061e5 100644
--- a/fpu/softfloat.h
+++ b/fpu/softfloat.h
@@ -415,6 +415,8 @@ int float128_lt( float128, float128 STATUS_PARAM );
 int float128_eq_signaling( float128, float128 STATUS_PARAM );
 int float128_le_quiet( float128, float128 STATUS_PARAM );
 int float128_lt_quiet( float128, float128 STATUS_PARAM );
+int float128_compare( float128, float128 STATUS_PARAM );
+int float128_compare_quiet( float128, float128 STATUS_PARAM );
 int float128_is_nan( float128 );
 int float128_is_signaling_nan( float128 );
 float128 float128_scalbn( float128, int STATUS_PARAM );