3 files changed, 108 insertions, 0 deletions
diff --git a/usr.bin/clang/llvm-diff/Makefile b/usr.bin/clang/llvm-diff/Makefile
new file mode 100644
index 000000000000..90eddc9551d9
--- /dev/null
+++ b/usr.bin/clang/llvm-diff/Makefile
@@ -0,0 +1,9 @@
+PROG_CXX=	llvm-diff
+
+SRCDIR=		llvm/tools/llvm-diff
+SRCS+=		lib/DiffConsumer.cpp
+SRCS+=		lib/DiffLog.cpp
+SRCS+=		lib/DifferenceEngine.cpp
+SRCS+=		llvm-diff.cpp
+
+.include "../llvm.prog.mk"
diff --git a/usr.bin/clang/llvm-diff/Makefile.depend b/usr.bin/clang/llvm-diff/Makefile.depend
new file mode 100644
index 000000000000..73df5dd192a7
--- /dev/null
+++ b/usr.bin/clang/llvm-diff/Makefile.depend
@@ -0,0 +1,23 @@
+# Autogenerated - do NOT edit!
+
+DIRDEPS = \
+	gnu/lib/csu \
+	include \
+	include/xlocale \
+	lib/${CSU_DIR} \
+	lib/clang/libllvm \
+	lib/libc \
+	lib/libc++ \
+	lib/libcompiler_rt \
+	lib/libcxxrt \
+	lib/libthr \
+	lib/libz \
+	lib/msun \
+	lib/ncurses/ncursesw \
+
+
+.include <dirdeps.mk>
+
+.if ${DEP_RELDIR} == ${_DEP_RELDIR}
+# local dependencies - needed for -jN in clean tree
+.endif
diff --git a/usr.bin/clang/llvm-diff/llvm-diff.1 b/usr.bin/clang/llvm-diff/llvm-diff.1
new file mode 100644
index 000000000000..93439bd08dad
--- /dev/null
+++ b/usr.bin/clang/llvm-diff/llvm-diff.1
@@ -0,0 +1,76 @@
+.\" Man page generated from reStructuredText.
+.
+.
+.nr rst2man-indent-level 0
+.
+.de1 rstReportMargin
+\\$1 \\n[an-margin]
+level \\n[rst2man-indent-level]
+level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
+-
+\\n[rst2man-indent0]
+\\n[rst2man-indent1]
+\\n[rst2man-indent2]
+..
+.de1 INDENT
+.\" .rstReportMargin pre:
+. RS \\$1
+. nr rst2man-indent\\n[rst2man-indent-level] \\n[an-margin]
+. nr rst2man-indent-level +1
+.\" .rstReportMargin post:
+..
+.de UNINDENT
+. RE
+.\" indent \\n[an-margin]
+.\" old: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.nr rst2man-indent-level -1
+.\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
+.in \\n[rst2man-indent\\n[rst2man-indent-level]]u
+..
+.TH "LLVM-DIFF" "1" "2023-05-24" "16" "LLVM"
+.SH NAME
+llvm-diff \- LLVM structural 'diff'
+.SH SYNOPSIS
+.sp
+\fBllvm\-diff\fP [\fIoptions\fP] \fImodule 1\fP \fImodule 2\fP [\fIglobal name ...\fP]
+.SH DESCRIPTION
+.sp
+\fBllvm\-diff\fP compares the structure of two LLVM modules, primarily
+focusing on differences in function definitions.  Insignificant
+differences, such as changes in the ordering of globals or in the
+names of local values, are ignored.
+.sp
+An input module will be interpreted as an assembly file if its name
+ends in \(aq.ll\(aq;  otherwise it will be read in as a bitcode file.
+.sp
+If a list of global names is given, just the values with those names
+are compared; otherwise, all global values are compared, and
+diagnostics are produced for globals which only appear in one module
+or the other.
+.sp
+\fBllvm\-diff\fP compares two functions by comparing their basic blocks,
+beginning with the entry blocks.  If the terminators seem to match,
+then the corresponding successors are compared; otherwise they are
+ignored.  This algorithm is very sensitive to changes in control flow,
+which tend to stop any downstream changes from being detected.
+.sp
+\fBllvm\-diff\fP is intended as a debugging tool for writers of LLVM
+passes and frontends.  It does not have a stable output format.
+.SH EXIT STATUS
+.sp
+If \fBllvm\-diff\fP finds no differences between the modules, it will exit
+with 0 and produce no output.  Otherwise it will exit with a non\-zero
+value.
+.SH BUGS
+.sp
+Many important differences, like changes in linkage or function
+attributes, are not diagnosed.
+.sp
+Changes in memory behavior (for example, coalescing loads) can cause
+massive detected differences in blocks.
+.SH AUTHOR
+Maintained by the LLVM Team (https://llvm.org/).
+.SH COPYRIGHT
+2003-2023, LLVM Project
+.\" Generated by docutils manpage writer.
+.