From 45669fecef45695a68481d3298b4c2d81e2afb40 Mon Sep 17 00:00:00 2001
From: niravthakkar <thakkarniravb@gmail.com>
Date: Wed, 14 Dec 2016 12:34:11 +0530
Subject: [PATCH] Added RRF-b mode support

---
 dynasm/dasm_s390x.lua | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/dynasm/dasm_s390x.lua b/dynasm/dasm_s390x.lua
index 8d30c93b..e0c47331 100644
--- a/dynasm/dasm_s390x.lua
+++ b/dynasm/dasm_s390x.lua
@@ -1167,6 +1167,8 @@ map_op = {
   cfebra_4 =	"0000b3980000RRF-e",
   -- RXE instructions
   sqdb_2 =     "ed0000000015RXE",
+  -- RRF-b instructions
+  didbr_4 =    "0000b3580000RRF-b",
 }
 for cond,c in pairs(map_cond) do
   -- Extended mnemonics for branches.
@@ -1292,6 +1294,10 @@ local function parse_template(params, template, nparams, pos)
     wputhw(op1);
     if a then a() end
     wputhw(op2);
+  elseif p == "RRF-b" then
+    wputhw(op1);
+    op2 = op2 + shl(parse_reg(params[1]),4) + shl(parse_reg(params[2]),12) + parse_reg(params[3]) + parse_mask(params[4])
+    wputhw(op2)
   elseif p == "w" then
     local mode, n, s = parse_label(params[1])
     wputhw(op1)