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Re: [PATCH, i386]: Insert "cld" via optimize mode switching
On 12/4/06, Michael Matz <firstname.lastname@example.org> wrote:
> I think it would have been good that the ABI mandated that the flag be
It does, on function entry and exit (i386 and x86-64 ABI).
The we in fact need cld insn only after asm statements. MODE_ENTRY can
be set to CLD_FLAG_SET (actually CLD_FLAG_CLEARED...) and call insns
wouldn't set MODE_UNINITIALIZED anymore. If we specify MODE_EXIT as
CLD_FLAG_CLEARED, then optimize_mode_switching pass will automatically
emmit cld after every asm statement, fulfilling ABI requirement about
Is this thinking pushing cld optimization too far?