From 40a11a7155bc474d85ded1fef183baae2007f101 Mon Sep 17 00:00:00 2001
From: Wojciech Kosior <kwojtus@protonmail.com>
Date: Sat, 5 Sep 2020 16:43:32 +0200
Subject: add tee instruction together with bench

---
 Makefile                                    |  3 ++-
 design/stack_machine.v                      | 12 ++++++++++--
 tclasm.tcl                                  |  5 +++++
 tests/stack_machine_tee/instructions.s.tcl  | 14 ++++++++++++++
 tests/stack_machine_tee/test.v              |  1 +
 tests/stack_machine_tee/words_to_verify.mem |  4 ++++
 6 files changed, 36 insertions(+), 3 deletions(-)
 create mode 100755 tests/stack_machine_tee/instructions.s.tcl
 create mode 120000 tests/stack_machine_tee/test.v
 create mode 100644 tests/stack_machine_tee/words_to_verify.mem

diff --git a/Makefile b/Makefile
index dfc8aab..8f4e729 100644
--- a/Makefile
+++ b/Makefile
@@ -35,7 +35,8 @@ STACK_MACHINE_OLD_TESTS := \
 STACK_MACHINE_TESTS := \
 	store \
 	load_store \
-	multiinstructions_load_store
+	multiinstructions_load_store \
+	tee
 
 # Add other tests here if You need
 TESTS := \
diff --git a/design/stack_machine.v b/design/stack_machine.v
index d0ca36b..04b1285 100644
--- a/design/stack_machine.v
+++ b/design/stack_machine.v
@@ -183,9 +183,14 @@ module stack_machine_new
    assign instr_set_sp = use_im && stack_same_size &&
 			 instruction[11:7] == 5'd0;
 
-   /* Instructions, that grom stack */
+   /* Instructions, that grow stack */
+   wire 	      instr_tee;
+   assign instr_tee = !set_im && !use_im && stack_grows &&
+		      instruction[11:0] == 12'd0;
+
    wire 	      instr_const;
-   assign instr_const = use_im && stack_grows && instruction[11:7] == 5'd0;
+   assign instr_const = use_im && stack_grows &&
+			instruction[11:7] == 5'd0;
 
    /* Instructions, that shrink stack */
    /* none now */
@@ -423,6 +428,9 @@ module stack_machine_new
 	      if (instr_const && first_execution_tick)
 		r1 <= im_effective;
 
+	      if (instr_tee)
+		r1 <= r1;
+
 	      if (instr_set_sp)
 		`SET_SP(im_effective);
 	   end // case: STEP_EXECUTING
diff --git a/tclasm.tcl b/tclasm.tcl
index fd45456..c00fe18 100644
--- a/tclasm.tcl
+++ b/tclasm.tcl
@@ -91,6 +91,11 @@ proc const {value} {
 }
 
 
+proc tee {} {
+    puts 0001000000000000
+}
+
+
 proc _store {address_part} {
     puts 011111100[__to_binary $address_part 7]
 }
diff --git a/tests/stack_machine_tee/instructions.s.tcl b/tests/stack_machine_tee/instructions.s.tcl
new file mode 100755
index 0000000..98117c7
--- /dev/null
+++ b/tests/stack_machine_tee/instructions.s.tcl
@@ -0,0 +1,14 @@
+#!/usr/bin/env tclsh
+
+source tclasm.tcl
+
+### All three stores should write the hABCDEF
+
+set_sp 0
+const hABCDEF
+tee
+store h000100
+tee
+store h000200
+store h000300
+halt
diff --git a/tests/stack_machine_tee/test.v b/tests/stack_machine_tee/test.v
new file mode 120000
index 0000000..f5b6a59
--- /dev/null
+++ b/tests/stack_machine_tee/test.v
@@ -0,0 +1 @@
+../stack_machine_store/test.v
\ No newline at end of file
diff --git a/tests/stack_machine_tee/words_to_verify.mem b/tests/stack_machine_tee/words_to_verify.mem
new file mode 100644
index 0000000..6be240d
--- /dev/null
+++ b/tests/stack_machine_tee/words_to_verify.mem
@@ -0,0 +1,4 @@
+// address  value
+   00100    ABCDEF
+   00200    ABCDEF
+   00300    ABCDEF
-- 
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