linux-kernel - Re: [PATCH 8/9] x86/bpf: Convert asm comments to AT&T syntax

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Date:   Fri, 14 Jun 2019 09:42:45 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Song Liu <songliubraving@...com>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        Kairui Song <kasong@...hat.com>
Subject: Re: [PATCH 8/9] x86/bpf: Convert asm comments to AT&T syntax

On Thu, Jun 13, 2019 at 06:52:24PM +0000, Song Liu wrote:
> > On Jun 13, 2019, at 6:21 AM, Josh Poimboeuf <jpoimboe@...hat.com> wrote:

> > @@ -403,11 +403,11 @@ static void emit_mov_imm64(u8 **pprog, u32 dst_reg,
> > 		 * For emitting plain u32, where sign bit must not be
> > 		 * propagated LLVM tends to load imm64 over mov32
> > 		 * directly, so save couple of bytes by just doing
> > -		 * 'mov %eax, imm32' instead.
> > +		 * 'mov imm32, %eax' instead.
> > 		 */
> > 		emit_mov_imm32(&prog, false, dst_reg, imm32_lo);
> > 	} else {
> > -		/* movabsq %rax, imm64 */
> > +		/* movabs imm64, %rax */
> 
> 		^^^^^ Should this be moveabsq? 
> 
> > 		EMIT2(add_1mod(0x48, dst_reg), add_1reg(0xB8, dst_reg));
> > 		EMIT(imm32_lo, 4);
> > 		EMIT(imm32_hi, 4);

Song, can you please trim replies; I only found what you said because of
Josh's reply.