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authorGabriel F. T. Gomes <gabriel@inconstante.eti.br>2018-06-28 22:38:55 -0300
committerGabriel F. T. Gomes <gabriel@inconstante.eti.br>2018-07-02 10:51:01 -0300
commitb7b88cea4151d85eafd7ababc2e4b7ae1daeedf5 (patch)
tree9e39b1e246cf3201522aafdbe073d29281684334 /stdio-common/tst-printfsz-islongdouble.c
parent2b445206a1a450af0e6e66d78652e1ffd80685e2 (diff)
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ldbl-128ibm-compat: Add printf_size
Since the addition of the _Float128 API, strfromf128 and printf_size use __printf_fp to print _Float128 values. This is achieved by setting the 'is_binary128' member of the 'printf_info' structure to one. Now that the format of long double on powerpc64le is getting a third option, this mechanism is reused for long double values that have binary128 format (i.e.: when -mabi=ieeelongdouble). This patch adds __printf_sizeieee128 as an exported symbol, but doesn't provide redirections from printf_size, yet. All redirections will be installed in a future commit, once all other functions that print or read long double values with binary128 format are ready. In __printf_fp, when 'is_binary128' is one, the floating-point argument is treated as if it was of _Float128 type, regardless of the value of 'is_long_double', thus __printf_sizeieee128 sets 'is_binary128' to the same value of 'is_long_double'. Otherwise, double values would not be printed correctly. Tested for powerpc64le.
Diffstat (limited to 'stdio-common/tst-printfsz-islongdouble.c')
-rw-r--r--stdio-common/tst-printfsz-islongdouble.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/stdio-common/tst-printfsz-islongdouble.c b/stdio-common/tst-printfsz-islongdouble.c
new file mode 100644
index 0000000000..a6a534bb3d
--- /dev/null
+++ b/stdio-common/tst-printfsz-islongdouble.c
@@ -0,0 +1,51 @@
+/* Test for the behaviour of 'is_long_double' in printf_size.
+ Copyright (C) 2018 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <printf.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <support/check.h>
+
+static int
+do_test (void)
+{
+ double d = 2000;
+ double *dptr = &d;
+ long double ld = 4000;
+ long double *ldptr = & ld;
+ struct printf_info info;
+
+ memset (&info, 0, sizeof (info));
+ info.spec = L'f';
+
+ /* Print a value with double type. */
+ printf_size (stdout, &info, (void *) &dptr);
+
+ /* Printf a value with long double type. */
+ info.is_long_double = 1;
+ printf_size (stdout, &info, (void *) &ldptr);
+
+ /* Setting both 'is_long_double' and 'is_binary128' to one is out of
+ the scope of this test, because such configuration is only valid
+ when _Float128 and long double are ABI-distinct (which is not
+ always true in this arch-independent test). */
+ return 0;
+}
+
+#include <support/test-driver.c>