[Qemu-devel] [Bug 1841592] [NEW] ppc: softfloat float implementation issues

[Paul Clarke]

Public bug reported:

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...

** Affects: qemu
     Importance: Undecided
         Status: New

** Attachment added: "float test case"
   
https://bugs.launchpad.net/bugs/1841592/+attachment/5284928/+files/test-ffma.c

** Description changed:

  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.
- > 
+ > 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...

** Description changed:

  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.
+ > but incorrect numerical results from the double rounding.
  >
  > This should probably be split to a separate bug...

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https://bugs.launchpad.net/bugs/1841592

Title:
  ppc: softfloat float implementation issues

Status in QEMU:
  New

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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