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Re: RFC -- update_equiv_regs and friends
- To: amylaar at cambridge dot redhat dot com
- Subject: Re: RFC -- update_equiv_regs and friends
- From: John Wehle <john at feith dot com>
- Date: Thu, 1 Mar 2001 21:44:04 -0500 (EST)
- Cc: law at redhat dot com, gcc at gcc dot gnu dot org, rth at redhat dot com
> > 2) Change update_equiv_regs so it doesn't promote a REG_EQUAL note
> > to a REG_EQUIV if there's a register mentioned.
>
> Promoting REG_EQUAL to REG_EQUIV is an important optimization for some
> procesors for sums involving the stack pointer, the frame pointer,
> virtual_stack_var_rtx and the argument pointer.
So allow the promation if the register is FIXED_REGISTERS?
-- John
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