[Qemu-ppc] Simple test case hits assert on ppc64 TCG mode

[Anton Blanchard]

Hi,

The test case below hits an assert:

qemu-system-ppc64: qemu/tcg/ppc/tcg-target.inc.c:2040: tcg_out_op: Assertion `c 
== (int16_t)c' failed. Aborted (core dumped)

Which is:

        if (USE_REG_TB) {
            /* For the unlinked case, need to reset TCG_REG_TB.  */
            c = -tcg_current_code_size(s);
            assert(c == (int16_t)c);
            tcg_out32(s, ADDI | TAI(TCG_REG_TB, TCG_REG_TB, c));
        }

I presume it's something to do with translation, since it doesn't
hit in user mode. I ran my tests on an Ubuntu 18.04 image (not that it
should make a difference).

Thanks,
Anton
--

#include <ppc-asm.h>

#define r2 2

FUNC_START(main)
        addis   r3,r2,address@hidden@ha
        addi    r3,r3,address@hidden@l
.rept 500
        lxvd2x  vs0,0,r3
.endr
        blr
FUNC_END(main)

        .section .data
        .balign 32
scratch1:
        .space 16