Paul Mackerras b8f7cbd894 FPU: Record bits shifted out of addend in fmadd-family instructions ...

If the addend is smaller than the product and thus needs to be shifted
right, record if any bits are lost from the right end in r.x, so that
the result gets rounded correctly.

Also add a test that checks one such case.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

2025-12-15 08:45:23 +11:00

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