[Bug tree-optimization/96370] ICE with -ffast-math since r7-950-g8a85cee26eabf5cf

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96370

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
More "complete" testcase:

void c(_Decimal128);
void a(_Decimal128 b)
{
  c(-b * b);
}