mirror of
https://github.com/c64scene-ar/llvm-6502.git
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b17201f1b8
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
71 lines
2.2 KiB
Python
71 lines
2.2 KiB
Python
#!/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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# This script runs with Python 2.6+ (including 3.x)
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from __future__ import print_function
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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):
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print(' .bundle_lock')
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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():
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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)
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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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if offset + instlen > BUNDLE_SIZE:
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# Padding needed
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print('# CHECK: {0:x}: nop'.format(inst_orig_offset))
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aligned_offset = (inst_orig_offset + instlen) & ~(BUNDLE_SIZE - 1)
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print('# CHECK: {0:x}: incl'.format(aligned_offset))
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else:
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# No padding needed
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print('# CHECK: {0:x}: incl'.format(inst_orig_offset))
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print()
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ntest += 1
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if __name__ == '__main__':
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generate()
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