linux-kernel - Re: [PATCH v3 3/3] powerpc/64: optimise LOAD_REG_IMMEDIATE

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Date:   Mon, 19 Aug 2019 09:24:59 -0500
From:   Segher Boessenkool <segher@...nel.crashing.org>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v3 3/3] powerpc/64: optimise LOAD_REG_IMMEDIATE_SYM()

On Mon, Aug 19, 2019 at 01:58:12PM +0000, Christophe Leroy wrote:
> -#define LOAD_REG_IMMEDIATE_SYM(reg,expr)	\
> -	lis     reg,(expr)@highest;		\
> -	ori     reg,reg,(expr)@higher;	\
> -	rldicr  reg,reg,32,31;		\
> -	oris    reg,reg,(expr)@__AS_ATHIGH;	\
> -	ori     reg,reg,(expr)@l;
> +#define LOAD_REG_IMMEDIATE_SYM(reg, tmp, expr)	\
> +	lis	reg, (expr)@highest;		\
> +	lis	tmp, (expr)@__AS_ATHIGH;	\
> +	ori	reg, reg, (expr)@higher;	\
> +	ori	tmp, reg, (expr)@l;		\
> +	rldimi	reg, tmp, 32, 0

That should be

#define LOAD_REG_IMMEDIATE_SYM(reg, tmp, expr)	\
	lis	tmp, (expr)@highest;		\
	ori	tmp, tmp, (expr)@higher;	\
	lis	reg, (expr)@__AS_ATHIGH;	\
	ori	reg, reg, (expr)@l;		\
	rldimi	reg, tmp, 32, 0

(tmp is the high half, reg is the low half, as inputs to that rldimi).


Segher