Alex MacLean
369d8148e0
[ValueTracking] use KnownBits to compute fpclass from bitcast ( #97762 )
...
When we encounter a bitcast from an integer type we can use the
information from `KnownBits` to glean some information about the
fpclass:
- If the sign bit is known, we can transfer this information over.
- If the float is IEEE format and enough of the bits are known, we may
be able to prove or rule out some fpclasses such as NaN, Zero, or Inf.
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