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Re: [RFC] patch: Re: reg+reg addressing mode on SPARC
On Mon, Aug 13, 2001 at 09:51:34AM -0700, Dan Nicolaescu wrote:
> Are you sure? (I have no idea...)
> Is anything taking into account that reg+reg is using 2 registers,
> thus increases the register pressure?
By setting ADDRESS_COST to 2 for reg+reg and 1 otherwise you say that
add %reg1, %reg2, %reg3
ld [%reg3], %reg4
is as fast as
ld [%reg1 + %reg2], %reg4
which is not true. All addressing modes are expensive equally on all chips
I know of.