[Bug target/79593] [6/7 Regression] Poor/Worse code generation for FPU on versions after 6

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79593

Uroš Bizjak <ubizjak at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |rguenth at gcc dot gnu.org

--- Comment #8 from Uroš Bizjak <ubizjak at gmail dot com> ---
The remaining fld %st(0) is there due to multiple uses of global_data+0, once
in XFmode and once in SFmode. But this is what tree optimizers give us:

  long double min;
  long double delta;

  float _2;

  <bb 3> [54.00%]:
  _2 = global_data[0];
  delta_13 = (long double) _2;
  _3 = global_data[1];
  min_14 = (long double) _3;
  pretmp_28 = *e_11(D).D.2291.f;
  if (_2 < 0.0)
    goto <bb 4>; [36.00%]
  else
    goto <bb 5>; [64.00%]

Please note the comparison (_2 < 0.0). I don't know why, looking at the source,
delta_13 should be used there. Let's ask tree experts.