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#!/usr/bin/env python3
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)
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