[RFC/PATCH 0/3] ARM: Use udiv/sdiv for __aeabi_{u}idiv library functions

Nicolas Pitre
2015-11-23T02:36:45Z

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