d409305fa3
This updates llvm, clang, compiler-rt, libc++, libunwind, lld, lldb and openmp to llvmorg-12.0.0-0-gd28af7c654d8, a.k.a. 12.0.0 release. PR: 255570 MFC after: 6 weeks
78 lines
2.5 KiB
Groff
78 lines
2.5 KiB
Groff
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.TH "LLVM-DIFF" "1" "2021-06-07" "12" "LLVM"
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.SH NAME
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llvm-diff \- LLVM structural 'diff'
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.SH SYNOPSIS
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.sp
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\fBllvm\-diff\fP [\fIoptions\fP] \fImodule 1\fP \fImodule 2\fP [\fIglobal name ...\fP]
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.SH DESCRIPTION
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.sp
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\fBllvm\-diff\fP compares the structure of two LLVM modules, primarily
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focusing on differences in function definitions. Insignificant
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differences, such as changes in the ordering of globals or in the
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names of local values, are ignored.
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.sp
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An input module will be interpreted as an assembly file if its name
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ends in \(aq.ll\(aq; otherwise it will be read in as a bitcode file.
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.sp
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If a list of global names is given, just the values with those names
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are compared; otherwise, all global values are compared, and
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diagnostics are produced for globals which only appear in one module
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or the other.
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.sp
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\fBllvm\-diff\fP compares two functions by comparing their basic blocks,
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beginning with the entry blocks. If the terminators seem to match,
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then the corresponding successors are compared; otherwise they are
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ignored. This algorithm is very sensitive to changes in control flow,
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which tend to stop any downstream changes from being detected.
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.sp
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\fBllvm\-diff\fP is intended as a debugging tool for writers of LLVM
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passes and frontends. It does not have a stable output format.
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.SH EXIT STATUS
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.sp
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If \fBllvm\-diff\fP finds no differences between the modules, it will exit
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with 0 and produce no output. Otherwise it will exit with a non\-zero
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value.
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.SH BUGS
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.sp
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Many important differences, like changes in linkage or function
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attributes, are not diagnosed.
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.sp
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Changes in memory behavior (for example, coalescing loads) can cause
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massive detected differences in blocks.
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.SH AUTHOR
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Maintained by the LLVM Team (https://llvm.org/).
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.SH COPYRIGHT
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2003-2021, LLVM Project
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