tools/testing/selftests/bpf/progs/pyperf600.c

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Facebook
#define STACK_MAX_LEN 600
/* clang will not unroll the loop 600 times.
 * Instead it will unroll it to the amount it deemed
 * appropriate, but the loop will still execute 600 times.
 * Total program size is around 90k insns
 */
#include "pyperf.h"
selftests/bpf: add realistic loop tests Add a bunch of loop tests. Most of them are created by replacing '#pragma unroll' with '#pragma clang loop unroll(disable)' Several tests are artificially large: /* partial unroll. llvm will unroll loop ~150 times. * C loop count -> 600. * Asm loop count -> 4. * 16k insns in loop body. * Total of 5 such loops. Total program size ~82k insns. / "./pyperf600.o", / no unroll at all. * C loop count -> 600. * ASM loop count -> 600. * ~110 insns in loop body. * Total of 5 such loops. Total program size ~1500 insns. / "./pyperf600_nounroll.o", / partial unroll. 19k insn in a loop. * Total program size 20.8k insn. * ~350k processed_insns */ "./strobemeta.o", Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> 2019-06-15 12:12:24 -07:00			`// SPDX-License-Identifier: GPL-2.0`
			`// Copyright (c) 2019 Facebook`
			`#define STACK_MAX_LEN 600`
			`/* clang will not unroll the loop 600 times.`
			`* Instead it will unroll it to the amount it deemed`
			`* appropriate, but the loop will still execute 600 times.`
			`* Total program size is around 90k insns`
			`*/`
			`#include "pyperf.h"`