| #!/usr/bin/env python |
| |
| from __future__ import print_function |
| |
| import os |
| import sys |
| import argparse |
| import subprocess |
| |
| parser = argparse.ArgumentParser() |
| |
| parser.add_argument("--start", type=int, default=0) |
| parser.add_argument("--end", type=int, default=(1 << 32)) |
| parser.add_argument("--optcmd", default=("opt")) |
| parser.add_argument("--filecheckcmd", default=("FileCheck")) |
| parser.add_argument("--prefix", default=("CHECK-BISECT")) |
| parser.add_argument("--test", default=("")) |
| |
| args = parser.parse_args() |
| |
| start = args.start |
| end = args.end |
| |
| opt_command = [args.optcmd, "-O2", "-opt-bisect-limit=%(count)s", "-S", args.test] |
| check_command = [args.filecheckcmd, args.test, "--check-prefix=%s" % args.prefix] |
| last = None |
| while start != end and start != end - 1: |
| count = int(round(start + (end - start) / 2)) |
| cmd = [x % {"count": count} for x in opt_command] |
| print("opt: " + str(cmd)) |
| opt_result = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE) |
| filecheck_result = subprocess.Popen(check_command, stdin=opt_result.stdout) |
| opt_result.stdout.close() |
| opt_result.stderr.close() |
| filecheck_result.wait() |
| if filecheck_result.returncode == 0: |
| start = count |
| else: |
| end = count |
| |
| print("Last good count: %d" % start) |