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Aligning section contents is not required, but only recommended, by the specification. Microsoft's documentation says (https://docs.microsoft.com/en-us/windows/desktop/debug/pe-format#section-table-section-headers): "For object files, the value should be aligned on a 4-byte boundary for best performance." However, according to my measurements, aligning section contents has a neutral to negative effect on performance. I measured the median run time of 100 links of Chromium's base_unittests on Linux with lld-link and on Windows with link.exe with both aligned and unaligned sections. On Linux I didn't see a measurable performance difference, and on Windows the link was slightly faster with unaligned sections (presumably because on Windows the bottleneck is I/O). Also, the sections created by cl.exe are unaligned, so we should expect tools to broadly accept unaligned sections. Differential Revision: https://reviews.llvm.org/D51149 llvm-svn: 340514