--- Additional Comments From rth at gcc dot gnu dot org 2005-03-31 21:38
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I'm going to assume there's no bug here. Re-open if you disagree.
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--- Additional Comments From Thomas dot Koenig at online dot de 2005-02-17
13:52 ---
Another datapoint - the fact that slarrb "has problems"
has been confirmed by a Lapack developer. A new version is
slated to appear as a patch soon. Hopefully, this will reduce
the potential hang in th
--- Additional Comments From Thomas dot Koenig at online dot de 2005-02-17
09:42 ---
(In reply to comment #7)
> Using Mathematica I get for
> (10^20 + 10^12 I)/(1 - 10^-8) = 10^20 + 2 * 10^12 I
>
> so really neither of them are mathematically correct.
The test case was (10^20-10^12*I)/
--- Additional Comments From pinskia at gcc dot gnu dot org 2005-02-17
03:30 ---
Using Mathematica I get for
(10^20 + 10^12 I)/(1 - 10^-8) = 10^20 + 2 * 10^12 I
so really neither of them are mathematically correct.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19974
--- Additional Comments From rth at gcc dot gnu dot org 2005-02-17 02:47
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The "problem" is the use of the fused multiply-and-add instructions.
1672 y = (b - (a * ratio)) / denom;
d6: 70 70 24 0c 54 00 fms.s.s0 f7=f9,f6,f14
This computes the intermedi
--- Additional Comments From rth at gcc dot gnu dot org 2005-02-16 23:17
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Confirmed. It's an ia64-specific miscompilation. Doesn't happen if libgcc
is built with -O0 instead of -O2.
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