tests += tst-get-cpu-features tst-get-cpu-features-static \
tst-cpu-features-cpuinfo tst-cpu-features-supports
tests-static += tst-get-cpu-features-static
+ifeq (yes,$(have-ifunc))
+tests += \
+ tst-ifunc-isa-1 \
+ tst-ifunc-isa-1-static \
+ tst-ifunc-isa-2 \
+ tst-ifunc-isa-2-static
+tests-static += \
+ tst-ifunc-isa-1-static \
+ tst-ifunc-isa-2-static
+endif
ifeq (yes,$(enable-x86-isa-level))
tests += tst-isa-level-1
modules-names += tst-isa-level-mod-1-baseline \
$(objpfx)tst-isa-level-mod-1-v3.so \
$(objpfx)tst-isa-level-mod-1-v4.so
endif
+ifneq ($(have-tunables),no)
+tst-ifunc-isa-2-ENV = GLIBC_TUNABLES=glibc.cpu.hwcaps=-SSE4_2,-AVX,-AVX2,-AVX512F
+tst-ifunc-isa-2-static-ENV = $(tst-ifunc-isa-2-ENV)
+endif
endif
ifeq ($(subdir),math)
--- /dev/null
+#include "tst-ifunc-isa-1.c"
--- /dev/null
+/* Check IFUNC resolver with CPU_FEATURE_USABLE.
+ Copyright (C) 2021 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 <stdlib.h>
+#include "tst-ifunc-isa.h"
+
+static int
+do_test (void)
+{
+ enum isa value = foo ();
+ enum isa expected = get_isa ();
+ return value == expected ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
+#include <support/test-driver.c>
--- /dev/null
+#include "tst-ifunc-isa-2.c"
--- /dev/null
+/* Check IFUNC resolver with CPU_FEATURE_USABLE and tunables.
+ Copyright (C) 2021 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 <stdlib.h>
+#include "tst-ifunc-isa.h"
+#include <support/test-driver.h>
+
+static int
+do_test (void)
+{
+ /* CPU must support SSE2. */
+ if (!__builtin_cpu_supports ("sse2"))
+ return EXIT_UNSUPPORTED;
+ enum isa value = foo ();
+ /* All ISAs, but SSE2, are disabled by tunables. */
+ return value == sse2 ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
+#include <support/test-driver.c>
--- /dev/null
+/* IFUNC resolver with CPU_FEATURE_USABLE.
+ Copyright (C) 2021 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 <sys/platform/x86.h>
+
+enum isa
+{
+ none,
+ sse2,
+ sse4_2,
+ avx,
+ avx2,
+ avx512f
+};
+
+enum isa
+get_isa (void)
+{
+ if (CPU_FEATURE_USABLE (AVX512F))
+ return avx512f;
+ if (CPU_FEATURE_USABLE (AVX2))
+ return avx2;
+ if (CPU_FEATURE_USABLE (AVX))
+ return avx;
+ if (CPU_FEATURE_USABLE (SSE4_2))
+ return sse4_2;
+ if (CPU_FEATURE_USABLE (SSE2))
+ return sse2;
+ return none;
+}
+
+static int
+isa_sse2 (void)
+{
+ return sse2;
+}
+
+static int
+isa_sse4_2 (void)
+{
+ return sse4_2;
+}
+
+static int
+isa_avx (void)
+{
+ return avx;
+}
+
+static int
+isa_avx2 (void)
+{
+ return avx2;
+}
+
+static int
+isa_avx512f (void)
+{
+ return avx512f;
+}
+
+static int
+isa_none (void)
+{
+ return none;
+}
+
+int foo (void) __attribute__ ((ifunc ("foo_ifunc")));
+
+void *
+foo_ifunc (void)
+{
+ switch (get_isa ())
+ {
+ case avx512f:
+ return isa_avx512f;
+ case avx2:
+ return isa_avx2;
+ case avx:
+ return isa_avx;
+ case sse4_2:
+ return isa_sse4_2;
+ case sse2:
+ return isa_sse2;
+ default:
+ break;
+ }
+ return isa_none;
+}