ext: Include libfputils

This changeset includes libfputils from revision bbf0d61d75. This
library can be used to convert to and from 80-bit floats and query the
type of an 80-bit float, which is needed to support the x87 FPU.

1 files changed, 82 insertions, 0 deletions

diff --git a/ext/fputils/tests/fp80_cvtf.c b/ext/fputils/tests/fp80_cvtf.c
new file mode 100644
index 000000000..0edfb2ded
--- /dev/null
+++ b/ext/fputils/tests/fp80_cvtf.c
@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2013, Andreas Sandberg
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above
+ *    copyright notice, this list of conditions and the following
+ *    disclaimer in the documentation and/or other materials provided
+ *    with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <fputils/fp80.h>
+
+#include "test_helper.h"
+
+#include <assert.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static void
+test_cvtf(const char *name, double fin)
+{
+    fp80_t v80 = fp80_cvfd(fin);
+    double v64 = fp80_cvtd(v80);
+
+    test_diag("Conversion '%e' -> fp80 -> double: %e", fin, v64);
+
+    printf("# ");
+    fp80_debug_dump(stdout, v80);
+    if (v64 == fin ||
+        (isnan(fin) && isnan(v64) && signbit(fin) == signbit(v64))) {
+        test_ok(name);
+    } else {
+        test_diag("MISMATCH: %e != %e", fin, v64);
+        test_fail(name);
+    }
+}
+
+static void
+test_cvtf_exp(const char *name, double x, int exp)
+{
+    double val = ldexp(x, exp);
+    test_cvtf(name, val);
+}
+
+int
+main(int argc, char *argv[])
+{
+    test_init(9);
+
+    test_cvtf("+inf", -INFINITY);
+    test_cvtf("-inf", INFINITY);
+    test_cvtf("+nan", NAN);
+    test_cvtf("-nan", -NAN);
+    test_cvtf("+0", 0);
+    test_cvtf("PI", M_PI);
+
+    test_cvtf_exp("smallest normal", 1.0, -1022);
+    test_cvtf_exp("denormal1", 0.5, -1022);
+    test_cvtf_exp("denormal2", 0.25, -1022);
+
+    test_exit();
+}