From 9fd2f21c38944c8a605020d6662bb5935c5bbee2 Mon Sep 17 00:00:00 2001
From: Kostis Sagonas <kostis@it.uu.se>
Date: Mon, 3 Mar 2014 01:40:39 +0100
Subject: First part of the basic test suite for the HiPE compiler

---
 lib/hipe/test/basic_SUITE_data/basic_floats.erl | 156 ++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 lib/hipe/test/basic_SUITE_data/basic_floats.erl

(limited to 'lib/hipe/test/basic_SUITE_data/basic_floats.erl')

diff --git a/lib/hipe/test/basic_SUITE_data/basic_floats.erl b/lib/hipe/test/basic_SUITE_data/basic_floats.erl
new file mode 100644
index 0000000000..a3df73b928
--- /dev/null
+++ b/lib/hipe/test/basic_SUITE_data/basic_floats.erl
@@ -0,0 +1,156 @@
+%%% -*- erlang-indent-level: 2 -*-
+%%%-------------------------------------------------------------------
+%%% Author: Kostis Sagonas
+%%%
+%%% Contains tests that manipulate floating point numbers.
+%%%-------------------------------------------------------------------
+-module(basic_floats).
+
+-export([test/0]).
+
+test() ->
+  ok = test_arith_ops(),
+  ok = test_fp_ebb(),
+  ok = test_fp_phi(),
+  ok = test_big_bad_float(),
+  ok = test_catch_bad_fp_arith(),
+  ok = test_catch_fp_conv(),
+  ok = test_fp_with_fp_exceptions(),
+  ok.
+
+%%--------------------------------------------------------------------
+
+test_arith_ops() ->
+  E = 2.5617,
+  5.703200000000001  = add(E),
+  0.5798000000000001 = sub(E),
+  8.047580550000001 = mult(E),
+  -6.023e23 = negate(6.023e23),
+  ok.
+
+add(X) ->
+  3.1415 + X.
+
+sub(X) ->
+  3.1415 - X.
+
+mult(X) ->
+  3.1415 * X.
+        
+%% tests the translation of the fnegate BEAM instruction.
+negate(X) ->
+  - (X + 0.0).
+
+%%--------------------------------------------------------------------
+%% Test the construction of overlapping extended basic blocks where
+%% BEAM has constructed one and hipe_icode_fp constructs the other.
+%%--------------------------------------------------------------------
+
+test_fp_ebb() ->
+  1.0 = foo(2*math:pi()),
+  1.0 = bar(2*math:pi()),
+  ok.
+
+foo(X) ->
+  X / (2 * math:pi()).
+
+bar(X) ->
+  F = float_two(),
+  case F < 3.0 of
+    true -> (X * F) / ((2 * F) * math:pi());
+    false -> weird
+  end.
+
+float_two() ->
+  2.0.
+
+%%--------------------------------------------------------------------
+
+test_fp_phi() ->
+  10 = fp_phi(10, 100),
+  undefined = fp_phi(1.1e302, 0.000000001),
+  ok.
+
+fp_phi(A, B) ->
+  case catch A / B of
+    {'EXIT', _Reason} -> undefined;
+    _ -> round(100 * (A / B))
+  end.
+
+%%--------------------------------------------------------------------
+
+-define(BS, "93904329458954829589425849258998492384932849328493284932849328493284932389248329432932483294832949245827588578423578435783475834758375837580745807304258924584295924588459834958349589348589345934859384958349583945893458934859438593485995348594385943859438593458934589345938594385934859483958348934589435894859485943859438594594385938459438595034950439504395043950495043593485943758.0").
+
+test_big_bad_float() ->
+  ok = try f2l(?BS) catch error:badarg -> ok end,
+  ok = case catch f2l(?BS) of {'EXIT', {badarg, _}} -> ok end,
+  ok.
+
+f2l(F) ->
+  float_to_list(list_to_float(F)).
+
+%%--------------------------------------------------------------------
+%% Tests catching of floating point bad arithmetic.
+
+test_catch_bad_fp_arith() ->
+ 5.7 = f(2.56),
+ {'EXIT', {badarith, _}} = bad_arith(9.9),
+ ok.
+
+f(F) when is_float(F) -> F + 3.14.
+
+bad_arith(F) when is_float(F) ->
+  catch F * 1.70000e+308.
+
+%%--------------------------------------------------------------------
+%% Tests proper catching of exceptions due to illegal convertion of
+%% bignums to floating point numbers.
+
+test_catch_fp_conv() ->
+  F = 1.7e308, %% F is a number very close to a maximum float.
+  ok = big_arith(F),
+  ok = big_const_float(F),
+  ok.
+
+big_arith(F) ->
+  I = trunc(F),
+  {'EXIT', {badarith, _}} = big_int_arith(I),
+  ok.
+
+big_int_arith(I) when is_integer(I) ->
+  catch(3.0 + 2*I).
+
+big_const_float(F) ->
+  I = trunc(F),
+  badarith = try (1/(2*I)) catch error:Err -> Err end,
+  _Ignore = 2/I,
+  {'EXIT', _} = (catch 4/(2*I)),
+  ok.
+
+%%--------------------------------------------------------------------
+%% Forces floating point exceptions and tests that subsequent, legal,
+%% operations are calculated correctly.
+
+test_fp_with_fp_exceptions() ->
+  0.0 = math:log(1.0),
+  badarith = try math:log(minus_one_float()) catch error:E1 -> E1 end,
+  0.0 = math:log(1.0),
+  badarith = try math:log(zero_float()) catch error:E2 -> E2 end,
+  0.0 = math:log(1.0),
+  %% An old-fashioned exception here just so as to test this case also
+  {'EXIT',_} = (catch fp_mult(3.23e133, 3.57e257)),
+  0.0 = math:log(1.0),
+  badarith = try fp_div(5.0,0.0) catch error:E3 -> E3 end,
+  0.0 = math:log(1.0),
+  ok.
+
+fp_mult(X, Y) -> X * Y.
+
+fp_div(X, Y) -> X / Y.
+
+%% The following two function definitions appear here just to shut
+%% off 'expression will fail with a badarg' warnings from the compiler
+
+zero_float() -> 0.0.
+
+minus_one_float() -> -1.0.
-- 
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