Subject: Re: [PATCH 1/2] powerpc: rewrite LOAD_REG_IMMEDIATE() as an intelligent macro

From: Segher Boessenkool <[email-masked]>
Date: Wed, 14 Aug 2019 15:10:42 -0500

Hi Christophe,

On Tue, Aug 13, 2019 at 09:59:35AM +0000, Christophe Leroy wrote:
> +		rldicr	\r, \r, 32, 31

Could you please write this as
		sldi	\r, \r, 32
?  It's much easier to read, imo (it's the exact same instruction).

You can do a lot cheaper sequences if you have a temporary reg, as well
(longest path of 3 insns instead of 5):
	lis rt,A
	ori rt,B
	lis rd,C
	ori rd,D
	rldimi rd,rt,32,0
to load ABCD.

Segher