Subzero: Add support for SSE4.1 instructions.

crosstest/crosstest.py

 #!/usr/bin/env python2
 
 import argparse
 import os
 import re
 import subprocess
 import sys
 import tempfile
 
 sys.path.insert(0, '../pydir')
@@ skipping 25 matching lines @@
                            help='Driver program')
     argparser.add_argument('--target', required=False, default='x8632',
                            choices=arch_map.keys(),
                            metavar='TARGET',
                            help='Translation target architecture')
     argparser.add_argument('-O', required=False, default='2', dest='optlevel',
                            choices=['m1', '-1', '0', '1', '2'],
                            metavar='OPTLEVEL',
                            help='Optimization level ' +
                                 '(m1 and -1 are equivalent)')
+    argparser.add_argument('--mattr',  required=False, default='sse2',
+                           dest='attr', choices=['sse2', 'sse4.1'],
+                           metavar='ATTRIBUTE', help='Target attribute')
     argparser.add_argument('--prefix', required=True,
                            metavar='SZ_PREFIX',
                            help='String prepended to Subzero symbol names')
     argparser.add_argument('--output', '-o', required=True,
                            metavar='EXECUTABLE',
                            help='Executable to produce')
     argparser.add_argument('--dir', required=False, default='.',
                            metavar='OUTPUT_DIR',
                            help='Output directory for all files')
     argparser.add_argument('--llvm-bin-path', required=False,
@@ skipping 30 matching lines @@
                 line = fix_target.sub('i686-pc-linux-gnu', line)
                 f.write(line)
             f.close()
 
         base_sz = '%s.O%s.%s' % (base, args.optlevel, args.target)
         asm_sz = os.path.join(args.dir, base_sz + '.sz.s')
         obj_sz = os.path.join(args.dir, base_sz + '.sz.o')
         obj_llc = os.path.join(args.dir, base + '.llc.o')
         shellcmd(['../llvm2ice',
                   '-O' + args.optlevel,
+                  '-mattr=' + args.attr,
                   '--target=' + args.target,
                   '--prefix=' + args.prefix,
                   '-o=' + asm_sz,
                   bitcode])
         shellcmd([os.path.join(llvm_bin_path, 'llvm-mc'),
                   '-arch=' + arch_map[args.target],
                   '-x86-asm-syntax=intel',
                   '-filetype=obj',
                   '-o=' + obj_sz,
                   asm_sz])
@@ skipping 21 matching lines @@
                       bitcode])
             objs.append(obj_llc)
         else:
             objs.append(bitcode)
 
     linker = 'clang' if os.path.splitext(args.driver)[1] == '.c' else 'clang++'
     # TODO: Remove -mstackrealign after Subzero supports stack alignment.
     shellcmd([os.path.join(llvm_bin_path, linker), '-g', '-m32',
               '-mstackrealign', args.driver] + objs +
              ['-lm', '-lpthread', '-o', os.path.join(args.dir, args.output)])