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stdlib: Add testcases for llabs(). (BZ #30263)

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Test minimum and maximum long long values, zero, 32bit crossover points, and
part of the range of long long values.  Use '-fno-builtin' to ensure we are
testing the implementation.

Reviewed-by: Wilco Dijkstra  <Wilco.Dijkstra@arm.com>
This commit is contained in:
Joe Simmons-Talbott 2023-04-04 09:57:47 -04:00 committed by Siddhesh Poyarekar
parent b11db301e1
commit d877b52d58
2 changed files with 57 additions and 0 deletions
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2
stdlib/Makefile
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@ -200,6 +200,7 @@ tests := \
tst-getrandom \
tst-labs \
tst-limits \
tst-llabs \
tst-makecontext \
tst-makecontext-align \
tst-makecontext2 \
@ -291,6 +292,7 @@ LDLIBS-test-dlclose-exit-race-helper.so = $(libsupport) $(shared-thread-library)
CFLAGS-tst-abs.c += -fno-builtin
CFLAGS-tst-labs.c += -fno-builtin
CFLAGS-tst-llabs.c += -fno-builtin
ifeq ($(have-cxx-thread_local),yes)
CFLAGS-tst-quick_exit.o = -std=c++11

55
stdlib/tst-llabs.c Normal file
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@ -0,0 +1,55 @@
/* Basic tests for llabs.
Copyright (C) 2023 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
<https://www.gnu.org/licenses/>. */
#include <limits.h>
#include <stdlib.h>
#include <support/check.h>
#define LARGE_PRIME 49999
static int do_test (void)
{
long i;
TEST_COMPARE(llabs(LLONG_MAX), LLONG_MAX);
TEST_COMPARE(llabs(LLONG_MIN + 1), LLONG_MAX);
TEST_COMPARE(llabs(0x00000000ffffffffL), 0x00000000ffffffffL);
TEST_COMPARE(llabs(0x0000000100000000L), 0x0000000100000000L);
TEST_COMPARE(llabs(0x80000000ffffffffL), 0x7fffffff00000001L);
TEST_COMPARE(llabs(0x8000000100000000L), 0x7fffffff00000000L);
TEST_COMPARE(llabs(-1), 1);
TEST_COMPARE(llabs(0), 0);
TEST_COMPARE(llabs(1), 1);
for (i = LLONG_MIN + 1; i < LLONG_MIN + INT_MAX; i += LARGE_PRIME)
TEST_COMPARE(llabs(i), -i);
for (i = LLONG_MAX - INT_MAX; i < LLONG_MAX - LARGE_PRIME; i += LARGE_PRIME)
TEST_COMPARE(llabs(i), i);
for (i = INT_MIN + 1; i < 0; i += LARGE_PRIME)
TEST_COMPARE(llabs(i), -i);
for (i = 0; i < INT_MAX; i += LARGE_PRIME)
TEST_COMPARE(llabs(i), i);
return EXIT_SUCCESS;
}
#include <support/test-driver.c>