[Bug c/100473] O2 vs optimization flags

[schwab--- via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100473

--- Comment #1 from Andreas Schwab <sch...@linux-m68k.org> ---
$ git grep 'optimize >= 2'
gcc/ChangeLog-2008:     100 for optimize >= 2.
gcc/ChangeLog-2010:     only conditionally on optimize >= 2.
gcc/ada/gcc-interface/trans.c:        && optimize >= 2
gcc/c-family/c-opts.c:                 optimize >= 2 && cxx_dialect >= cxx11);
gcc/config/aarch64/aarch64-cc-fusion.cc:  virtual bool gate (function *) {
return TARGET_SVE && optimize >= 2; }
gcc/config/aarch64/cortex-a57-fma-steering.c:         && optimize >= 2;
gcc/config/aarch64/falkor-tag-collision-avoidance.c:          && optimize >=
2);
gcc/config/arm/arm.c:      else if (optimize >= 2)
gcc/config/arm/arm.h:                           ((optimize >= 2) \
gcc/config/msp430/msp430.c:  bool speed = (!optimize_size && optimize >= 2);
gcc/config/msp430/msp430.c:           && (optimize >= 2 && !optimize_size))))
gcc/config/msp430/msp430.c:           && (optimize >= 2 && !optimize_size)
gcc/config/msp430/msp430.h:#define NO_FUNCTION_CSE (optimize >= 2 &&
!optimize_size)
gcc/expr.c:      && optimize >= 2
gcc/expr.c:      if (SCALAR_INT_MODE_P (mode) && optimize >= 2)
gcc/opts.c:  opt2 = (opts->x_optimize >= 2);
gcc/tree-ssa-dce.c:  return perform_tree_ssa_dce (/*aggressive=*/optimize >=
2);
gcc/tree-ssa-loop-ivcanon.c:  virtual bool gate (function *) { return optimize
>= 2; }