[Bug target/88877] rs6000 emits signed extension for unsigned int type(__floatunsidf).

[amodra at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88877

--- Comment #12 from Alan Modra <amodra at gmail dot com> ---
I suspect that the patch in comment #1 will break libcalls in other situations,
eg.

void f1 (int y)
{
  extern double d;
  d = y;
}