[Qemu-devel] [PATCH 1/2] softfloat: Fix uint64_to_float64

[Richard Henderson]

The interface to normalizeRoundAndPackFloat64 requires that the
high bit be clear.  Perform one shift-right-and-jam if needed.

Reviewed-by: Peter Maydell <address@hidden>
Signed-off-by: Richard Henderson <address@hidden>
---
 fpu/softfloat.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 0cfa6b4..20b05d4 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -1271,11 +1271,18 @@ float64 int64_to_float64( int64 a STATUS_PARAM )
 
 }
 
-float64 uint64_to_float64( uint64 a STATUS_PARAM )
+float64 uint64_to_float64(uint64 a STATUS_PARAM)
 {
-    if ( a == 0 ) return float64_zero;
-    return normalizeRoundAndPackFloat64( 0, 0x43C, a STATUS_VAR );
+    int exp =  0x43C;
 
+    if (a == 0) {
+        return float64_zero;
+    }
+    if ((int64_t)a < 0) {
+        shift64RightJamming(a, 1, &a);
+        exp += 1;
+    }
+    return normalizeRoundAndPackFloat64(0, exp, a STATUS_VAR);
 }
 
 /*----------------------------------------------------------------------------
-- 
1.7.11.7