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authorRichard Henderson <rth@twiddle.net>2012-12-31 10:09:03 -0800
committerBlue Swirl <blauwirbel@gmail.com>2013-01-05 10:12:49 +0000
commit17ed229379d971ae117245b353324115a62b0014 (patch)
tree14550aafa433d95e3f7d1e12e2fd71642aa06216 /fpu/softfloat.c
parenta4c7ecd8ca998044bfafa0bdd7ea47270e7ebad6 (diff)
softfloat: Fix uint64_to_float64
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>
Diffstat (limited to 'fpu/softfloat.c')
-rw-r--r--fpu/softfloat.c13
1 files changed, 10 insertions, 3 deletions
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 0cfa6b4831..20b05d4392 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);
}
/*----------------------------------------------------------------------------