target-ppc: Altivec's mtvscr Decodes Wrong Register

The Move to Vector Status and Control Register (mtvscr) instruction uses VRB as the source register. Fix the code generator to correctly decode the VRB field. That is, use "rB(ctx->opcode)" instead of "rD(ctx->opcode)".

---
 target-ppc/translate.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

index 910ce56..d381632 100644
@@ -6848,7 +6848,7 @@ static void gen_mtvscr(DisasContext *ctx)
         gen_exception(ctx, POWERPC_EXCP_VPU);
         return;
     }
-    p = gen_avr_ptr(rD(ctx->opcode));
+    p = gen_avr_ptr(rB(ctx->opcode));
     gen_helper_mtvscr(cpu_env, p);
     tcg_temp_free_ptr(p);
 }

1.7.1

Thanks, applied to ppc-next (for 2.2)

Alex