Steve Langasek <[EMAIL PROTECTED]> writes:
> On Mon, Aug 22, 2005 at 08:56:23PM -0700, Steve Langasek wrote:
>> Simple test case:
>
>> int main() {
>>
>> unsigned long a= 1UL << 63;
>> unsigned long b= 1UL << 63;
>>
>> exit (a/b != 1);
>> }
>
>> Appears to be a bug in the implementation of __divqu. Upgrading to 2.3.5-4,
>> to confirm whether the bug still exists.
>
> Yep, bug still present in 2.3.5-4. Someone who speaks alpha assembly will
> have to look at this, I think, to pinpoint the error.
probably something like
--- divqu.S~ 2005-07-09 21:55:07.000000000 +0200
+++ divqu.S 2005-08-23 10:04:09.000000000 +0200
@@ -240,7 +240,7 @@
/* If we get here, Y is so big that bit 63 is set. The results
from the divide will be completely wrong. Fortunately, the
quotient must be either 0 or 1, so just compute it directly. */
- cmpult Y, X, RV
+ cmpule Y, X, RV
excb
mt_fpcr $f3
ldt $f0, 0(sp)
but I don't have time for testing.
--
Falk
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