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LLVM-DIFF(1)			     LLVM			  LLVM-DIFF(1)

NAME
       llvm-diff - LLVM	structural 'diff'

SYNOPSIS
       llvm-diff [options] module 1 module 2 [global name ...]

DESCRIPTION
       llvm-diff  compares the structure of two	LLVM modules, primarily	focus-
       ing on differences in function definitions.  Insignificant differences,
       such  as	 changes  in  the ordering of globals or in the	names of local
       values, are ignored.

       An input	module will be interpreted as an assembly  file	 if  its  name
       ends in '.ll';  otherwise it will be read in as a bitcode file.

       If  a  list  of global names is given, just the values with those names
       are compared; otherwise,	all global values are compared,	 and  diagnos-
       tics  are  produced  for	globals	which only appear in one module	or the
       other.

       llvm-diff compares two functions	by comparing their basic  blocks,  be-
       ginning	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.

       llvm-diff is intended as	a debugging tool for writers  of  LLVM	passes
       and frontends.  It does not have	a stable output	format.

EXIT STATUS
       If  llvm-diff  finds  no	 differences between the modules, it will exit
       with 0 and produce no output.  Otherwise	it will	exit with  a  non-zero
       value.

BUGS
       Many  important	differences,  like  changes in linkage or function at-
       tributes, are not diagnosed.

       Changes in memory behavior (for example,	coalescing  loads)  can	 cause
       massive detected	differences in blocks.

AUTHOR
       Maintained by the LLVM Team (https://llvm.org/).

COPYRIGHT
       2003-2020, LLVM Project

10				  2020-08-27			  LLVM-DIFF(1)

NAME | SYNOPSIS | DESCRIPTION | EXIT STATUS | BUGS | AUTHOR | COPYRIGHT

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