[Bug target/63408] [4.9/5/6 regression] GCC emits incorrect fixed->fp conversion instruction on Cortex-M4 target

[ramana at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63408

--- Comment #12 from Ramana Radhakrishnan <ramana at gcc dot gnu.org> ---
Created attachment 35833
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35833&action=edit
current patch.

Patch I'm testing - this is based on a 4.9 tree where I could easily replicate
the problem but applies cleanly to trunk.