I'm confused by this testcase as it's not a fused multiply-add but as
you say two combined operations.

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  ppc: softfloat float implementation issues

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Bug description:
  Per bug #1841491, Richard Henderson (rth) said:
  > The float test failure is part of a larger problem for target/powerpc
  > in which all float routines are implemented incorrectly. They are all
  > implemented as double operations with rounding to float as a second
  > step. Which not only produces incorrect exceptions, as in this case,
  > but incorrect numerical results from the double rounding.
  > This should probably be split to a separate bug...

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