Fix CMakeLists and add a constexpr test

- ap_types should be correctly foundable now.
- A unit-test to check for constexpr rightness have been added.

CMakeLists.txt

@@ -15,12 +15,20 @@ project (
   VERSION 0.1
 )
 
-option (EXPORT_COMMANDS "Export compile commands, for use with clangd for example." ON)
+####################################################################################################
+# Options
+####################################################################################################
+
+option (EXPORT_COMMANDS "export compile commands, for use with clangd for example." ON)
+option (ENABLE_XILINX "use Xilinx provided and proprietary headers." OFF)
+
+option (ENABLE_TESTING "use Catch2 in conjunction with CTest as a test suite." ON)
+####################################################################################################
+
 if (EXPORT_COMMANDS)
   set (CMAKE_EXPORT_COMPILE_COMMANDS ON)
 endif ()
 
-option (ENABLE_XILINX "use Xilinx provided and proprietary headers." ON)
 if (ENABLE_XILINX)
   set (
     XILINX_HOME
@@ -30,7 +38,7 @@ if (ENABLE_XILINX)
   set (
     XILINX_VER
     "2020.2"
-    CACHE STRING "Xilinx software version to use." FORCE
+    CACHE STRING "Xilinx software version to use."
   )
 
   if (XILINX_VER VERSION_GREATER_EQUAL "2020.1")
@@ -40,39 +48,37 @@ if (ENABLE_XILINX)
   endif ()
   message (STATUS "AP headers must lie under ${AP_INCLUDE_DIR}")
 else ()
-  set (
+  find_file (AP_FIXED ap_fixed.h PATH_SUFFIXES ap_types hls_ap_types/include REQUIRED)
-    HLS_AP_T_DIR
+
-    ${CMAKE_SOURCE_DIR}/../../Utilities/C++/hls_ap_types
+  get_filename_component (AP_INCLUDE_DIR ${AP_FIXED} DIRECTORY)
-    CACHE PATH "path to a clone of HLS_arbitrary_Precision_Types."
-  )
-  set (AP_INCLUDE_DIR ${HLS_AP_T_DIR}/include)
 endif ()
 
-if ((NOT EXISTS ${AP_INCLUDE_DIR}/ap_int.h) OR (NOT EXISTS
+if ((NOT EXISTS ${AP_INCLUDE_DIR}/ap_int.h) OR (NOT EXISTS ${AP_INCLUDE_DIR}/ap_fixed.h))
-                                                ${AP_INCLUDE_DIR}/ap_fixed.h)
+  message (FATAL_ERROR "Arbitrary precision headers not found in ${AP_INCLUDE_DIR}.\n"
-)
-  message (
-    FATAL_ERROR
-      "Arbitrary precision headers not found in ${AP_INCLUDE_DIR}.\n"
                        "Please provide a suitable path to the headers."
   )
 endif ()
 
-add_subdirectory(RomGenerators)
+add_subdirectory (RomGenerators)
 
-add_library (cordic STATIC sources/CCordicRotate/CCordicRotate.cpp sources/CCordicRotateHalfPiRom/CCordicRotateHalfPiRom.cpp)
+add_library (
+  cordic STATIC sources/CCordicRotate/CCordicRotate.cpp
+                sources/CCordicRotateHalfPiRom/CCordicRotateHalfPiRom.cpp
+)
 target_include_directories (cordic PUBLIC sources)
 target_include_directories (cordic SYSTEM PUBLIC ${AP_INCLUDE_DIR})
-target_link_libraries(cordic PUBLIC romgen)
+target_link_libraries (cordic PUBLIC romgen)
 
-find_package(Catch2 REQUIRED)
+if (ENABLE_TESTING)
+  find_package (Catch2 REQUIRED)
 
-add_library (catch_common OBJECT sources/tb/main_catch2.cpp)
+  add_library (catch_common OBJECT sources/tb/main_catch2.cpp)
-target_link_libraries(catch_common PUBLIC Catch2::Catch2)
+  target_link_libraries (catch_common PUBLIC Catch2::Catch2)
 
-add_executable(cordic_tb sources/tb/cordic_tb.cpp)
+  add_executable (cordic_tb sources/tb/cordic_tb.cpp)
-target_link_libraries(cordic_tb PUBLIC cordic catch_common)
+  target_link_libraries (cordic_tb PUBLIC cordic catch_common)
 
-include(CTest)
+  include (CTest)
-include(Catch)
+  include (Catch)
-catch_discover_tests(cordic_tb)
+  catch_discover_tests (cordic_tb)
+endif ()

cmake_format_conf.py

@@ -0,0 +1,240 @@
+# ----------------------------------
+# Options affecting listfile parsing
+# ----------------------------------
+with section("parse"):
+
+    # Specify structure for custom cmake functions
+    # additional_commands = {'foo': {'flags': ['BAR', 'BAZ'],
+    #                                'kwargs': {'DEPENDS': '*', 'HEADERS': '*', 'SOURCES': '*'}}}
+
+    # Override configurations per-command where available
+    override_spec = {}
+
+    # Specify variable tags.
+    vartags = []
+
+    # Specify property tags.
+    proptags = []
+
+# -----------------------------
+# Options affecting formatting.
+# -----------------------------
+with section("format"):
+
+    # Disable formatting entirely, making cmake-format a no-op
+    disable = False
+
+    # How wide to allow formatted cmake files
+    line_width = 100
+
+    # How many spaces to tab for indent
+    tab_size = 2
+
+    # If true, lines are indented using tab characters (utf-8 0x09) instead of
+    # <tab_size> space characters (utf-8 0x20). In cases where the layout would
+    # require a fractional tab character, the behavior of the  fractional
+    # indentation is governed by <fractional_tab_policy>
+    use_tabchars = False
+
+    # If <use_tabchars> is True, then the value of this variable indicates how
+    # fractional indentions are handled during whitespace replacement. If set to
+    # 'use-space', fractional indentation is left as spaces (utf-8 0x20). If set
+    # to `round-up` fractional indentation is replaced with a single tab character
+    # (utf-8 0x09) effectively shifting the column to the next tabstop
+    fractional_tab_policy = 'round-up'
+
+    # If an argument group contains more than this many sub-groups (parg or kwarg
+    # groups) then force it to a vertical layout.
+    max_subgroups_hwrap = 2
+
+    # If a positional argument group contains more than this many arguments, then
+    # force it to a vertical layout.
+    max_pargs_hwrap = 3
+
+    # If a cmdline positional group consumes more than this many lines without
+    # nesting, then invalidate the layout (and nest)
+    max_rows_cmdline = 2
+
+    # If true, separate flow control names from their parentheses with a space
+    separate_ctrl_name_with_space = True
+
+    # If true, separate function names from parentheses with a space
+    separate_fn_name_with_space = True
+
+    # If a statement is wrapped to more than one line, than dangle the closing
+    # parenthesis on its own line.
+    dangle_parens = True
+
+    # If the trailing parenthesis must be 'dangled' on its on line, then align it
+    # to this reference: `prefix`: the start of the statement,  `prefix-indent`:
+    # the start of the statement, plus one indentation  level, `child`: align to
+    # the column of the arguments
+    dangle_align = 'prefix'
+
+    # If the statement spelling length (including space and parenthesis) is
+    # smaller than this amount, then force reject nested layouts.
+    min_prefix_chars = 4
+
+    # If the statement spelling length (including space and parenthesis) is larger
+    # than the tab width by more than this amount, then force reject un-nested
+    # layouts.
+    max_prefix_chars = 10
+
+    # If a candidate layout is wrapped horizontally but it exceeds this many
+    # lines, then reject the layout.
+    max_lines_hwrap = 2
+
+    # What style line endings to use in the output.
+    line_ending = 'unix'
+
+    # Format command names consistently as 'lower' or 'upper' case
+    command_case = 'lower'
+
+    # Format keywords consistently as 'lower' or 'upper' case
+    keyword_case = 'upper'
+
+    # A list of command names which should always be wrapped
+    always_wrap = []
+
+    # If true, the argument lists which are known to be sortable will be sorted
+    # lexicographicall
+    enable_sort = True
+
+    # If true, the parsers may infer whether or not an argument list is sortable
+    # (without annotation).
+    autosort = False
+
+    # By default, if cmake-format cannot successfully fit everything into the
+    # desired linewidth it will apply the last, most agressive attempt that it
+    # made. If this flag is True, however, cmake-format will print error, exit
+    # with non-zero status code, and write-out nothing
+    require_valid_layout = False
+
+    # A dictionary mapping layout nodes to a list of wrap decisions. See the
+    # documentation for more information.
+    layout_passes = {}
+
+# ------------------------------------------------
+# Options affecting comment reflow and formatting.
+# ------------------------------------------------
+with section("markup"):
+
+    # What character to use for bulleted lists
+    bullet_char = '*'
+
+    # What character to use as punctuation after numerals in an enumerated list
+    enum_char = '.'
+
+    # If comment markup is enabled, don't reflow the first comment block in each
+    # listfile. Use this to preserve formatting of your copyright/license
+    # statements.
+    first_comment_is_literal = False
+
+    # If comment markup is enabled, don't reflow any comment block which matches
+    # this (regex) pattern. Default is `None` (disabled).
+    literal_comment_pattern = None
+
+    # Regular expression to match preformat fences in comments default=
+    # ``r'^\s*([`~]{3}[`~]*)(.*)$'``
+    fence_pattern = '^\\s*([`~]{3}[`~]*)(.*)$'
+
+    # Regular expression to match rulers in comments default=
+    # ``r'^\s*[^\w\s]{3}.*[^\w\s]{3}$'``
+    ruler_pattern = '^\\s*[^\\w\\s]{3}.*[^\\w\\s]{3}$'
+
+    # If a comment line matches starts with this pattern then it is explicitly a
+    # trailing comment for the preceeding argument. Default is '#<'
+    explicit_trailing_pattern = '#<'
+
+    # If a comment line starts with at least this many consecutive hash
+    # characters, then don't lstrip() them off. This allows for lazy hash rulers
+    # where the first hash int8_t is not separated by space
+    hashruler_min_length = 10
+
+    # If true, then insert a space between the first hash int8_t and remaining hash
+    # chars in a hash ruler, and normalize its length to fill the column
+    canonicalize_hashrulers = True
+
+    # enable comment markup parsing and reflow
+    enable_markup = True
+
+# ----------------------------
+# Options affecting the linter
+# ----------------------------
+with section("lint"):
+
+    # a list of lint codes to disable
+    disabled_codes = []
+
+    # regular expression pattern describing valid function names
+    function_pattern = '[0-9a-z_]+'
+
+    # regular expression pattern describing valid macro names
+    macro_pattern = '[0-9A-Z_]+'
+
+    # regular expression pattern describing valid names for variables with global
+    # (cache) scope
+    global_var_pattern = '[A-Z][0-9A-Z_]+'
+
+    # regular expression pattern describing valid names for variables with global
+    # scope (but internal semantic)
+    internal_var_pattern = '_[A-Z][0-9A-Z_]+'
+
+    # regular expression pattern describing valid names for variables with local
+    # scope
+    local_var_pattern = '[a-z][a-z0-9_]+'
+
+    # regular expression pattern describing valid names for privatedirectory
+    # variables
+    private_var_pattern = '_[0-9a-z_]+'
+
+    # regular expression pattern describing valid names for public directory
+    # variables
+    public_var_pattern = '[A-Z][0-9A-Z_]+'
+
+    # regular expression pattern describing valid names for function/macro
+    # arguments and loop variables.
+    argument_var_pattern = '[a-z][a-z0-9_]+'
+
+    # regular expression pattern describing valid names for keywords used in
+    # functions or macros
+    keyword_pattern = '[A-Z][0-9A-Z_]+'
+
+    # In the heuristic for C0201, how many conditionals to match within a loop in
+    # before considering the loop a parser.
+    max_conditionals_custom_parser = 2
+
+    # Require at least this many newlines between statements
+    min_statement_spacing = 1
+
+    # Require no more than this many newlines between statements
+    max_statement_spacing = 2
+    max_returns = 6
+    max_branches = 12
+    max_arguments = 5
+    max_localvars = 15
+    max_statements = 50
+
+# -------------------------------
+# Options affecting file encoding
+# -------------------------------
+with section("encode"):
+
+    # If true, emit the unicode byte-order mark (BOM) at the start of the file
+    emit_byteorder_mark = False
+
+    # Specify the encoding of the input file. Defaults to utf-8
+    input_encoding = 'utf-8'
+
+    # Specify the encoding of the output file. Defaults to utf-8. Note that cmake
+    # only claims to support utf-8 so be careful when using anything else
+    output_encoding = 'utf-8'
+
+# -------------------------------------
+# Miscellaneous configurations options.
+# -------------------------------------
+with section("misc"):
+
+    # A dictionary containing any per-command configuration overrides. Currently
+    # only `command_case` is supported.
+    per_command = {}

sources/tb/cordic_tb.cpp

@@ -186,7 +186,6 @@ TEST_CASE("ROM-based Cordic works with AP-Types", "[CORDIC]") {
         out_stream.open("results_ap.dat");
         // FILE * romf = fopen("rom.dat", "w");
 
-
         constexpr double abs_margin = double(1 << cordic.Out_I) * 2. / 100.;
 
         // Executing the encoder
@@ -300,3 +299,27 @@ TEST_CASE("ROM-based Cordic works with AP-Types", "[CORDIC]") {
         // Return 0 if the test passed
     }
 }
+
+TEST_CASE("ROM-based Cordic constexpr are evaluated during compilation.", "[CORDIC]") {
+    constexpr unsigned n_lines = 100000;
+
+    SECTION("W:16 - I:4 - Stages:6 - q:64 - C-Types") {
+
+        static constexpr cordic_rom cordic {};
+
+        constexpr double   rotation   = cordic_rom::rom_cordic.rotation;
+        constexpr double   q          = cordic_rom::rom_cordic.q;
+        constexpr uint64_t max_length = cordic_rom::rom_cordic.max_length;
+
+        constexpr complex<int64_t> value_in = (1U << 12) * 97;
+        constexpr uint8_t          angle    = 169;
+
+        double results_re[n_lines];
+        double results_im[n_lines];
+
+        constexpr complex<int64_t> res = cordic.cordic(value_in, angle);
+        static_assert(res == cordic.cordic(value_in, angle), "Test");
+        REQUIRE_FALSE(res == cordic.cordic(complex<int64_t>(1, 0), angle));
+        REQUIRE(res == cordic.cordic(value_in, angle));
+    }
+}