Aleksandar Markovic <aleksandar.qemu.de...@gmail.com> writes:
> 11:53 Pet, 27.03.2020. Alex Bennée <alex.ben...@linaro.org> је написао/ла:
>>
>> The undefined behaviour checker
>
> Alex, what exactly is "undefined behaviour checker"? If this is a test, can
> you give us a link?
It's enabled by our sanitizers build:
../../configure --cc=clang-8 --cxx=clang++-8 --enable-sanitizers
>
> Sincerely,
> Aleksandar
>
>> pointed out that a shift of 64 would
>> lead to undefined behaviour.
>>
>> Signed-off-by: Alex Bennée <alex.ben...@linaro.org>
>> ---
>> fpu/softfloat.c | 11 ++++++++---
>> 1 file changed, 8 insertions(+), 3 deletions(-)
>>
>> diff --git a/fpu/softfloat.c b/fpu/softfloat.c
>> index 301ce3b537b..444d35920dd 100644
>> --- a/fpu/softfloat.c
>> +++ b/fpu/softfloat.c
>> @@ -3834,9 +3834,14 @@ void normalizeFloatx80Subnormal(uint64_t aSig,
> int32_t *zExpPtr,
>> {
>> int8_t shiftCount;
>>
>> - shiftCount = clz64(aSig);
>> - *zSigPtr = aSig<<shiftCount;
>> - *zExpPtr = 1 - shiftCount;
>> + if (aSig) {
>> + shiftCount = clz64(aSig);
>> + *zSigPtr = aSig << shiftCount;
>> + *zExpPtr = 1 - shiftCount;
>> + } else {
>> + *zSigPtr = 0;
>> + *zExpPtr = 1 - 64;
>> + }
>> }
>>
>>
>
> /*----------------------------------------------------------------------------
>> --
>> 2.20.1
>>
>>
--
Alex Bennée
