RFR: Add support for ARMv6 to ARM JIT

[Edward Nevill]

On Wed, Jan 21, 2015 at 5:16 PM, Andrew Haley <aph at redhat.com> wrote:

> On 01/21/2015 05:06 PM, Edward Nevill wrote:
>
> > Because of the size of the changes I have introduced a new file
> > arm32JIT.cpp rather than modifying the existing thumb2.cpp. This is
> > switched on a symbol ARM32JIT. By default it will continue to build
> > the Thumb2 JIT. To change it to build the ARM32 JIT by default add
> > -DARM32JIT to CFLAGS in zeroshark.make as in the following patch.
>
> I don't get this.  Surely we should have both, switchable at runtime.
>


arm32jit.cpp supports generation for ARMV6, ARMV6K and ARMV6T2+.

For ARMV6 and ARMV6K it will generate 32 bit ARM instructions.

For ARMV6T2 and later it will generate Thumb2 instructions by defaulty, but
this can be changed by setting the T2_COMPILE_ARM environment variable.

All the best,
Ed.
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