If you were desperate, you could compile a perl with PERL_PRESERVE_IVUV turned off.

Hey ... that works!! (No, I'm not desperate - just anal :-)

Any arithmetic operation on IV's now seems to turn them into NV's so (-2 * 0) reports -0 even though the original operands are IV's.
(2 * -0) reports 0, but that's to be expected given the underlying events.
(2 * -0.0) does report -0, again as expected.

One thing I did find while building this perl was that 'dmake test' reported 2 failures in the Devel::Peek tests - all other tests passed. I suspect those 2 Devel::Peek tests might be overlooking the possibility of NO_PERL_PRESERVE_IVUV being defined. I'll check that out properly later today, and submit a bug report.

Cheers,
Rob

In reply to Re^4: Negative zero from a multiplication by a zero? by syphilis
in thread Negative zero from a multiplication by a zero? by Anonymous Monk

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