1 files changed, 70 insertions, 0 deletions
diff --git a/llvm/utils/testgen/mc-bundling-x86-gen.py b/llvm/utils/testgen/mc-bundling-x86-gen.py
new file mode 100644
index 00000000000..2088e876af7
--- /dev/null
+++ b/llvm/utils/testgen/mc-bundling-x86-gen.py
@@ -0,0 +1,70 @@
+#!/usr/bin/python
+
+# Auto-generates an exhaustive and repetitive test for correct bundle-locked
+# alignment on x86.
+# For every possible offset in an aligned bundle, a bundle-locked group of every
+# size in the inclusive range [1, bundle_size] is inserted. An appropriate CHECK
+# is added to verify that NOP padding occurred (or did not occur) as expected.
+
+# This script runs with Python 2.6+ (including 3.x)
+
+from __future__ import print_function
+
+BUNDLE_SIZE_POW2 = 4
+BUNDLE_SIZE = 2 ** BUNDLE_SIZE_POW2
+
+PREAMBLE = '''
+# RUN: llvm-mc -filetype=obj -triple i386-pc-linux-gnu %s -o - \\
+# RUN:   | llvm-objdump -triple i386 -disassemble -no-show-raw-insn - | FileCheck %s
+
+# !!! This test is auto-generated from utils/testgen/mc-bundling-x86-gen.py !!!
+#     It tests that bundle-aligned grouping works correctly in MC. Read the
+#     source of the script for more details.
+
+  .text
+  .bundle_align_mode {0}
+'''.format(BUNDLE_SIZE_POW2).lstrip()
+
+ALIGNTO = '  .align {0}, 0x90'
+NOPFILL = '  .fill {0}, 1, 0x90'
+
+def print_bundle_locked_sequence(len):
+  print('  .bundle_lock')
+  print('  .rept {0}'.format(len))
+  print('  inc %eax')
+  print('  .endr')
+  print('  .bundle_unlock')
+
+def generate():
+  print(PREAMBLE)
+  
+  ntest = 0
+  for instlen in range(1, BUNDLE_SIZE + 1):
+    for offset in range(0, BUNDLE_SIZE):
+      # Spread out all the instructions to not worry about cross-bundle
+      # interference.
+      print(ALIGNTO.format(2 * BUNDLE_SIZE))
+      print('INSTRLEN_{0}_OFFSET_{1}:'.format(instlen, offset))
+      if offset > 0:
+        print(NOPFILL.format(offset))
+      print_bundle_locked_sequence(instlen)
+
+      # Now generate an appropriate CHECK line
+      base_offset = ntest * 2 * BUNDLE_SIZE
+      inst_orig_offset = base_offset + offset  # had it not been padded...
+      
+      if offset + instlen > BUNDLE_SIZE:
+        # Padding needed
+        print('# CHECK: {0:x}: nop'.format(inst_orig_offset))
+        aligned_offset = (inst_orig_offset + instlen) & ~(BUNDLE_SIZE - 1)
+        print('# CHECK: {0:x}: incl'.format(aligned_offset))
+      else:
+        # No padding needed
+        print('# CHECK: {0:x}: incl'.format(inst_orig_offset))
+
+      print()
+      ntest += 1
+
+if __name__ == '__main__':
+  generate()
+