Add lxsdx

This patch adds the Load VSX Scalar Doubleowrd Indexed (lxsdx)
instruction.

The lower 8 bytes of the target register are undefined; this
implementation leaves those bytes unaltered.
Signed-off-by: NTom Musta <tommusta@gmail.com>
Reviewed-by: NRichard Henderson <rth@twiddle.net>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAlexander Graf <agraf@suse.de>

target-ppc/translate.c

@@ -7003,6 +7003,21 @@ static inline TCGv_i64 cpu_vsrl(int n)
     }
 }
 
+static void gen_lxsdx(DisasContext *ctx)
+{
+    TCGv EA;
+    if (unlikely(!ctx->vsx_enabled)) {
+        gen_exception(ctx, POWERPC_EXCP_VSXU);
+        return;
+    }
+    gen_set_access_type(ctx, ACCESS_INT);
+    EA = tcg_temp_new();
+    gen_addr_reg_index(ctx, EA);
+    gen_qemu_ld64(ctx, cpu_vsrh(xT(ctx->opcode)), EA);
+    /* NOTE: cpu_vsrl is undefined */
+    tcg_temp_free(EA);
+}
+
 static void gen_lxvd2x(DisasContext *ctx)
 {
     TCGv EA;
@@ -9502,6 +9517,7 @@ GEN_VAFORM_PAIRED(vmsumshm, vmsumshs, 20),
 GEN_VAFORM_PAIRED(vsel, vperm, 21),
 GEN_VAFORM_PAIRED(vmaddfp, vnmsubfp, 23),
 
+GEN_HANDLER_E(lxsdx, 0x1F, 0x0C, 0x12, 0, PPC_NONE, PPC2_VSX),
 GEN_HANDLER_E(lxvd2x, 0x1F, 0x0C, 0x1A, 0, PPC_NONE, PPC2_VSX),
 
 GEN_HANDLER_E(stxvd2x, 0x1F, 0xC, 0x1E, 0, PPC_NONE, PPC2_VSX),