From patchwork Fri Dec 7 21:52:06 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [1/2] softfloat: Fix uint64_to_float64 Date: Fri, 07 Dec 2012 11:52:06 -0000 From: Richard Henderson X-Patchwork-Id: 204613 Message-Id: <1354917127-29718-2-git-send-email-rth@twiddle.net> To: qemu-devel@nongnu.org The interface to normalizeRoundAndPackFloat64 requires that the high bit be clear. Perform one shift-right-and-jam if needed. Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- 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 ); } /*----------------------------------------------------------------------------