1#!/usr/bin/env python 2 3from __future__ import print_function 4 5import os 6import sys 7import argparse 8import subprocess 9 10parser = argparse.ArgumentParser() 11 12parser.add_argument('--start', type=int, default=0) 13parser.add_argument('--end', type=int, default=(1 << 32)) 14parser.add_argument('--optcmd', default=("opt")) 15parser.add_argument('--filecheckcmd', default=("FileCheck")) 16parser.add_argument('--prefix', default=("CHECK-BISECT")) 17parser.add_argument('--test', default=("")) 18 19args = parser.parse_args() 20 21start = args.start 22end = args.end 23 24opt_command = [args.optcmd, "-O2", "-opt-bisect-limit=%(count)s", "-S", args.test] 25check_command = [args.filecheckcmd, args.test, "--check-prefix=%s" % args.prefix] 26last = None 27while start != end and start != end-1: 28 count = int(round(start + (end - start)/2)) 29 cmd = [x % {'count':count} for x in opt_command] 30 print("opt: " + str(cmd)) 31 opt_result = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE) 32 filecheck_result = subprocess.Popen(check_command, stdin=opt_result.stdout) 33 opt_result.stdout.close() 34 opt_result.stderr.close() 35 filecheck_result.wait() 36 if filecheck_result.returncode == 0: 37 start = count 38 else: 39 end = count 40 41print("Last good count: %d" % start) 42