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softfloat: Fix uint64_to_float64

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

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
This commit is contained in:
Richard Henderson 2012-12-31 10:09:03 -08:00 committed by Blue Swirl
parent a4c7ecd8ca
commit 17ed229379
1 changed files with 10 additions and 3 deletions
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13
fpu/softfloat.c
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@ -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);
}
/*----------------------------------------------------------------------------