https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70961
Stefan "Bebbo" Franke <stefan at franke dot ms> changed:
What |Removed |Added
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CC| |stefan at franke dot ms
--- Comment #6 from Stefan "Bebbo" Franke <stefan at franke dot ms> ---
Simply remove the outer loop and iterate only once:
has_preferred_class = (preferred_class != NO_REGS);
for (new_reg = 0; new_reg < FIRST_PSEUDO_REGISTER; new_reg++)
{
if (has_preferred_class
&& !TEST_HARD_REG_BIT(reg_class_contents[preferred_class],
new_reg))
continue;
if (!check_new_reg_p (old_reg, new_reg, this_head, *unavailable))
continue;
if (!best_rename)
return new_reg;
/* In the first pass, we force the renaming of registers that
don't belong to PREFERRED_CLASS to registers that do, even
though the latters were used not very long ago.
Also use a register if no best_new_reg was found till now */
if ((tick[best_new_reg] > tick[new_reg]
|| (old_reg == best_new_reg && new_reg < old_reg)))
best_new_reg = new_reg;
}
The last "if" is my experimental version. I am also testing (with m68k) an
extended preferred_rename_class2 method, which uses the register to return a
maybe better class:
preferred_class = (enum reg_class) targetm.preferred_rename_class2 (
super_class, old_reg);
And yes, the code is smaller and faster.
