[Bug target/89746] powerpc-none-eabi-gcc emits code using stfiwx to misaligned address

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89746

--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(This is on a PowerPC 750).

The compiler makes an unaligned store for this, because it knows no better
than it is just a SImode store:

  d_5 = (int) f_4(D);
  _10 = (unsigned int) d_5;
  MEM[(short int *)p_7(D) + 6B] = _10;

and *normal* unaligned stores of SImode are just fine -- they just cause
an extra access if crossing an 8B boundary.  OTOH, floating point load/store
cause a misalignment interrupt if unaligned.