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Add a largish auto-generated test for the aligned bundling feature, along with

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the script generating it. The test should never be modified manually. If anyone
needs to change it, please change the script and re-run it.

The script is placed into utils/testgen - I couldn't think of a better place,
and after some discussion on IRC this looked like a logical location.





git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170720 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eli Bendersky 2012-12-20 19:16:57 +00:00
parent 16996c4940
commit b17201f1b8
2 changed files with 2744 additions and 0 deletions
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2674
test/MC/X86/AlignedBundling/autogen-inst-offset-padding.s Normal file
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70
utils/testgen/mc-bundling-x86-gen.py Normal file
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#!/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()