On 09/05/2018 04:48 AM, a...@codesourcery.com wrote: > @@ -1198,6 +1198,10 @@ see the files COPYING3 and COPYING.RUNTIME > respectively. If not, see > #define NO_FUNCTION_CSE false > #endif > > +#ifndef SPECIAL_REGNO_P > +#define SPECIAL_REGNO_P(REGNO) false > +#endif > + > #ifndef HARD_REGNO_RENAME_OK > #define HARD_REGNO_RENAME_OK(FROM, TO) true > #endif ...
> @@ -320,6 +320,7 @@ check_new_reg_p (int reg ATTRIBUTE_UNUSED, int new_reg, > if (TEST_HARD_REG_BIT (this_unavailable, new_reg + i) > || fixed_regs[new_reg + i] > || global_regs[new_reg + i] > + || SPECIAL_REGNO_P (new_reg + i) > /* Can't use regs which aren't saved by the prologue. */ > || (! df_regs_ever_live_p (new_reg + i) > && ! call_used_regs[new_reg + i]) How is this different from HARD_REGNO_RENAME_OK via the TO argument? Seems like the hook you're looking for already exists... r~
