linux-kernel - Re: [PATCH] ARCv2: build: use mcpu=hs38 iso generic mcpu=archs

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Date:   Thu, 11 Oct 2018 14:47:20 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Alexey Brodkin <alexey.brodkin@...opsys.com>
Cc:     "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Vineet Gupta <vineet.gupta1@...opsys.com>
Subject: Re: [PATCH] ARCv2: build: use mcpu=hs38 iso generic mcpu=archs

Hi Alexey,

On Thu, Oct 11, 2018 at 09:22:50PM +0000, Alexey Brodkin wrote:
> Hu Guenter,
> 
> > -----Original Message-----
> > From: linux-snps-arc [mailto:linux-snps-arc-bounces@...ts.infradead.org] On Behalf Of Guenter Roeck
> > Sent: Wednesday, September 12, 2018 7:58 PM
> > To: Vineet Gupta <vineet.gupta1@...opsys.com>
> > Cc: linux-snps-arc@...ts.infradead.org; linux-kernel@...r.kernel.org
> > Subject: Re: [PATCH] ARCv2: build: use mcpu=hs38 iso generic mcpu=archs
> > 
> > Hi,
> > 
> > On Fri, Sep 07, 2018 at 03:13:10PM -0700, Vineet Gupta wrote:
> > > helps gcc with better instruction selections such as 64-bit multiply MPYD
> > >
> > > before
> > > ------
> > > 82c34b58 <sched_clock>:
> > > 82c34b58:	ld	r2,[0x83068d00]
> > > 82c34b60:	add_s	r2,r2,0x7530
> > > 82c34b66:	mov_s	r0,0x989680
> > > 82c34b6c:	mpymu	r5,r2,r0
> > > 82c34b70:	mpy	r4,r2,r0
> > > 82c34b74:	mov_s	r0,r4
> > > 82c34b76:	j_s.d	[blink]
> > > 82c34b78:	mov_s	r1,r5
> > > 82c34b7a:	nop_s
> > >
> > > after
> > > ------
> > > 82c34b7c <sched_clock>:
> > > 82c34b7c:	ld	r0,[0x83064d00]
> > > 82c34b84:	add_s	r0,r0,0x7530
> > > 82c34b8a:	mpydu	r0,r0,0x989680
> > > 82c34b92:	j_s	[blink]
> > >
> > > Signed-off-by: Vineet Gupta <vgupta@...opsys.com>
> > 
> > This patch causes my arc2 test builds to fail
> > 
> > Building arc:axs103_defconfig ... failed
> > --------------
> > Error log:
> > 
> > standard input}: Assembler messages:
> > {standard input}:154: Error: inappropriate arguments for opcode 'st'
> > {standard input}:157: Error: Insn j_s has a jump/branch instruction j_s in its delay slot.
> > {standard input}:186: Error: inappropriate arguments for opcode 'st'
> > make[3]: *** [net/core/dev.o] Error 1
> > make[2]: *** [net/core] Error 2
> > 
> > Building arc:nsim_hs_smp_defconfig ... failed
> > --------------
> > Error log:
> > {standard input}: Assembler messages:
> > {standard input}:218: Error: inappropriate arguments for opcode 'st'
> > {standard input}:9329: Error: inappropriate arguments for opcode 'st'
> > 
> > Building arc:vdk_hs38_smp_defconfig ... failed
> > --------------
> > Error log:
> > 
> > {standard input}: Assembler messages:
> > {standard input}:9629: Error: inappropriate arguments for opcode 'st'
> > {standard input}:9883: Error: inappropriate arguments for opcode 'st'
> > 
> > I use a toolchain based on gcc 7.3.0 and binutils 2.30. What version
> > of gcc and binutils do I need for the builds to complete ?
> 
> I would strongly recommend to use GCC 8.2+ for ARC as there were
> quite some improvements and fixes done for ARC.
> 
> You may use master branch of Crosstool-NG for building uClibc multilib toolchain
> for ARC based on Binutils 2.31.1 and GCC 8.2.0.
> 

Yes, I had figured that out a couple of weeks ago and already switched
to those revisions.

Thanks,
Guenter