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all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
78 lines
2.5 KiB
Groff
78 lines
2.5 KiB
Groff
.\" $FreeBSD$
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.\" Man page generated from reStructuredText.
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.TH "LLVM-DIFF" "1" "2014-01-01" "3.4" "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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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 (http://llvm.org/).
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.SH COPYRIGHT
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2003-2013, LLVM Project
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.\" Generated by docutils manpage writer.
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