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Date: Sun, 22 Nov 2015 21:36:45 -0500 (EST)
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Arnd Bergmann <arnd@...db.de>
cc: Russell King - ARM Linux <linux@....linux.org.uk>,
Peter Maydell <peter.maydell@...aro.org>,
Måns Rullgård <mans@...sr.com>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
Stephen Boyd <sboyd@...eaurora.org>,
lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>,
Steven Rostedt <rostedt@...dmis.org>,
arm-mail-list <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC/PATCH 0/3] ARM: Use udiv/sdiv for __aeabi_{u}idiv library
functions
On Sun, 22 Nov 2015, Arnd Bergmann wrote:
> I've also found some /proc/cpuinfo output to cross-reference SoCs
> to their core names.
>
> variant part revision name features
> dove: 0 0x581 5 PJ4 idivt
I just managed to boot my dusty Dove DB and ran a quick test programon
it. Its cpuinfo corresponds to the above.
$ cat m.c
#include <stdio.h>
int mydiv(int, int);
int main()
{
printf("div test\n");
printf("%d\n", mydiv(12345678, 37));
return 0;
}
$ cat d.c
int mydiv(int x, int y)
{
return x/y;
}
$ gcc -o test m.c d.c
$ ./test
div test
333666
$ gcc -o test m.c d.c -march=armv7ve -mthumb
$ ./test
div test
333666
$ gcc -o test m.c d.c -march=armv7ve -marm
$ ./test
div test
Illegal instruction (core dumped)
$
Nicolas
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