ARM: Add a postRA pass to legalize stack offsets. Greedy approach (reserve IP).

pydir/crosstest.py

 #!/usr/bin/env python2
 
 import argparse
 import os
 import subprocess
 import sys
 import tempfile
 
 import targets
 from utils import shellcmd
@@ skipping 11 matching lines @@
     the test functions with a variety of interesting inputs and compares their
     results.
 
     """
     # arch_map maps a Subzero target string to TargetInfo (e.g., triple).
     arch_map = { 'x8632': targets.X8632Target,
                  'x8664': targets.X8664Target,
                  'arm32': targets.ARM32Target }
     arch_sz_flags = { 'x8632': [],
                       'x8664': [],
-                      # TODO(jvoung): remove skip-unimplemented when implemented
-                      'arm32': ['--skip-unimplemented']
+                      # TODO(jvoung): remove skip-unimplemented when
+                      # implemented.
+                      # For ARM, test a large stack offset as well, until we
+                      # are more confident. +/- 4095 is the limit, so test
+                      # somewhere near that boundary.
+                      'arm32': ['--skip-unimplemented',
+                                '--test-stack-extra', '4084']
     }
     arch_llc_flags_extra = {
         # Use sse2 instructions regardless of input -mattr
         # argument to avoid differences in (undefined) behavior of
         # converting NaN to int.
         'x8632': ['-mattr=sse2'],
         'x8664': ['-mattr=sse2'],
         'arm32': [],
     }
     desc = 'Build a cross-test that compares Subzero and llc translation.'
@@ skipping 138 matching lines @@
                       if args.sandbox else
                       ['-g', '-target=' + triple,
                        '-lm', '-lpthread',
                        '-Wl,--defsym=__Sz_AbsoluteZero=0'] +
                       target_info.cross_headers)
     shellcmd([compiler, args.driver] + objs +
              ['-o', os.path.join(args.dir, args.output)] + sb_native_args)
 
 if __name__ == '__main__':
     main()