target-ppc: Add xvxexpdp instruction

xvxexpdp: VSX Vector Extract Exponent Dual Precision
Signed-off-by: NNikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

target/ppc/translate/vsx-impl.inc.c

@@ -1413,6 +1413,23 @@ static void gen_xvxexpsp(DisasContext *ctx)
     tcg_gen_andi_i64(xtl, xtl, 0xFF000000FF);
 }
 
+static void gen_xvxexpdp(DisasContext *ctx)
+{
+    TCGv_i64 xth = cpu_vsrh(xT(ctx->opcode));
+    TCGv_i64 xtl = cpu_vsrl(xT(ctx->opcode));
+    TCGv_i64 xbh = cpu_vsrh(xB(ctx->opcode));
+    TCGv_i64 xbl = cpu_vsrl(xB(ctx->opcode));
+
+    if (unlikely(!ctx->vsx_enabled)) {
+        gen_exception(ctx, POWERPC_EXCP_VSXU);
+        return;
+    }
+    tcg_gen_shri_i64(xth, xbh, 52);
+    tcg_gen_andi_i64(xth, xth, 0x7FF);
+    tcg_gen_shri_i64(xtl, xbl, 52);
+    tcg_gen_andi_i64(xtl, xtl, 0x7FF);
+}
+
 #undef GEN_XX2FORM
 #undef GEN_XX3FORM
 #undef GEN_XX2IFORM

target/ppc/translate/vsx-ops.inc.c

@@ -126,6 +126,7 @@ GEN_VSX_XFORM_300(xsiexpqp, 0x4, 0x1B, 0x00000001),
 
 GEN_XX3FORM(xviexpsp, 0x00, 0x1B, PPC2_ISA300),
 GEN_XX3FORM(xviexpdp, 0x00, 0x1F, PPC2_ISA300),
+GEN_XX2FORM_EO(xvxexpdp, 0x16, 0x1D, 0x00, PPC2_ISA300),
 GEN_XX2FORM_EO(xvxexpsp, 0x16, 0x1D, 0x08, PPC2_ISA300),
 
 GEN_XX2FORM(xvabsdp, 0x12, 0x1D, PPC2_VSX),