From: Steve Peters <steve@fisharerojo.org>
Date: Fri, 15 Apr 2005 09:10:54 +0000 (-0500)
Subject: IEEE math for the masses
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=0630166f39b2fc31415e8078cd74fafef99606af;p=p5sagit%2Fp5-mst-13.2.git

IEEE math for the masses
Message-ID: <20050415141054.GA12749@mccoy.peters.homeunix.org>

(tests added to t/op/exp.t)

p4raw-id: //depot/perl@24371
---

diff --git a/pp.c b/pp.c
index d107ab5..2ba5b61 100644
--- a/pp.c
+++ b/pp.c
@@ -35,6 +35,14 @@
 extern Pid_t getpid (void);
 #endif
 
+/*
+ * Some BSDs and Cygwin default to POSIX math instead of IEEE.
+ * This switches them over to IEEE.
+ */
+#if defined(LIBM_LIB_VERSION)
+    _LIB_VERSION_TYPE _LIB_VERSION = _IEEE_;
+#endif
+
 /* variations on pp_null */
 
 PP(pp_stub)
diff --git a/t/op/exp.t b/t/op/exp.t
index 689f367..927c5da 100755
--- a/t/op/exp.t
+++ b/t/op/exp.t
@@ -6,7 +6,7 @@ BEGIN {
     require './test.pl';
 }
 
-plan tests => 6;
+plan tests => 22;
 
 # compile time evaluation
 
@@ -29,3 +29,35 @@ $s = exp($x1);
 is(substr($s,0,7), '2.71828');
 
 ok(exp(log($x1)) == 1);
+
+# tests for transcendental functions
+
+my $pi = 3.1415926535897931160;
+my $pi_2 = 1.5707963267948965580;
+
+sub round {
+   my $result = shift;
+   return sprintf("%.9f", $result);
+}
+
+# sin() tests
+ok(sin(0) == 0.0);
+ok(round(sin($pi)) == 0.0);
+ok(round(sin(-1 * $pi)) == 0.0);
+ok(round(sin($pi_2)) == 1.0);
+ok(round(sin(-1 * $pi_2)) == -1.0);
+
+# cos() tests
+ok(cos(0) == 1.0);
+ok(round(cos($pi)) == -1.0);
+ok(round(cos(-1 * $pi)) == -1.0);
+ok(round(cos($pi_2)) == 0.0);
+ok(round(cos(-1 * $pi_2)) == 0.0);
+
+# atan2() tests
+ok(round(atan2(-0.0, 0.0)) == 0);
+ok(round(atan2(0.0, 0.0)) == 0);
+ok(round(atan2(-0.0, -0.0)) == round(-1 * $pi));
+ok(round(atan2(0.0, -0.0)) == round($pi));
+ok(round(atan2(-1.0, 0.0)) == round(-1 * $pi_2));
+ok(round(atan2(1.0, 0.0)) == round($pi_2));