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


From: Richard Henderson
Subject: [Qemu-devel] [PATCH 1/2] softfloat: Fix uint64_to_float64
Date: Fri, 7 Dec 2012 15:52:06 -0600

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

Signed-off-by: Richard Henderson <address@hidden>
---
 fpu/softfloat.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 8413146..62830d7 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -1273,9 +1273,14 @@ float64 int64_to_float64( int64 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




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