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104 lines
3.7 KiB
Python
104 lines
3.7 KiB
Python
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#!/usr/bin/python
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# Auto-generates an exhaustive and repetitive test for correct bundle-locked
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# alignment on x86.
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# For every possible offset in an aligned bundle, a bundle-locked group of every
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# size in the inclusive range [1, bundle_size] is inserted. An appropriate CHECK
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# is added to verify that NOP padding occurred (or did not occur) as expected.
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# Run with --align-to-end to generate a similar test with align_to_end for each
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# .bundle_lock directive.
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# This script runs with Python 2.7 and 3.2+
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from __future__ import print_function
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import argparse
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BUNDLE_SIZE_POW2 = 4
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BUNDLE_SIZE = 2 ** BUNDLE_SIZE_POW2
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PREAMBLE = '''
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# RUN: llvm-mc -filetype=obj -triple i386-pc-linux-gnu %s -o - \\
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# RUN: | llvm-objdump -triple i386 -disassemble -no-show-raw-insn - | FileCheck %s
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# !!! This test is auto-generated from utils/testgen/mc-bundling-x86-gen.py !!!
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# It tests that bundle-aligned grouping works correctly in MC. Read the
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# source of the script for more details.
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.text
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.bundle_align_mode {0}
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'''.format(BUNDLE_SIZE_POW2).lstrip()
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ALIGNTO = ' .align {0}, 0x90'
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NOPFILL = ' .fill {0}, 1, 0x90'
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def print_bundle_locked_sequence(len, align_to_end=False):
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print(' .bundle_lock{0}'.format(' align_to_end' if align_to_end else ''))
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print(' .rept {0}'.format(len))
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print(' inc %eax')
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print(' .endr')
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print(' .bundle_unlock')
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def generate(align_to_end=False):
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print(PREAMBLE)
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ntest = 0
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for instlen in range(1, BUNDLE_SIZE + 1):
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for offset in range(0, BUNDLE_SIZE):
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# Spread out all the instructions to not worry about cross-bundle
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# interference.
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print(ALIGNTO.format(2 * BUNDLE_SIZE))
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print('INSTRLEN_{0}_OFFSET_{1}:'.format(instlen, offset))
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if offset > 0:
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print(NOPFILL.format(offset))
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print_bundle_locked_sequence(instlen, align_to_end)
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# Now generate an appropriate CHECK line
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base_offset = ntest * 2 * BUNDLE_SIZE
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inst_orig_offset = base_offset + offset # had it not been padded...
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def print_check(adjusted_offset=None, nop_split_offset=None):
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if adjusted_offset is not None:
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print('# CHECK: {0:x}: nop'.format(inst_orig_offset))
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if nop_split_offset is not None:
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print('# CHECK: {0:x}: nop'.format(nop_split_offset))
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print('# CHECK: {0:x}: incl'.format(adjusted_offset))
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else:
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print('# CHECK: {0:x}: incl'.format(inst_orig_offset))
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if align_to_end:
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if offset + instlen == BUNDLE_SIZE:
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# No padding needed
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print_check()
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elif offset + instlen < BUNDLE_SIZE:
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# Pad to end at nearest bundle boundary
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offset_to_end = base_offset + (BUNDLE_SIZE - instlen)
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print_check(offset_to_end)
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else: # offset + instlen > BUNDLE_SIZE
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# Pad to end at next bundle boundary, splitting the nop sequence
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# at the nearest bundle boundary
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offset_to_nearest_bundle = base_offset + BUNDLE_SIZE
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offset_to_end = base_offset + (BUNDLE_SIZE * 2 - instlen)
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if offset_to_nearest_bundle == offset_to_end:
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offset_to_nearest_bundle = None
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print_check(offset_to_end, offset_to_nearest_bundle)
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else:
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if offset + instlen > BUNDLE_SIZE:
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# Padding needed
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aligned_offset = (inst_orig_offset + instlen) & ~(BUNDLE_SIZE - 1)
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print_check(aligned_offset)
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else:
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# No padding needed
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print_check()
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print()
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ntest += 1
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if __name__ == '__main__':
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argparser = argparse.ArgumentParser()
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argparser.add_argument('--align-to-end',
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action='store_true',
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help='generate .bundle_lock with align_to_end option')
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args = argparser.parse_args()
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generate(align_to_end=args.align_to_end)
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