mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-12-04 09:45:00 +00:00
1f3a59e29b
- The POD versions are slated for execution, but are still around until llvm.org machinery is in place. llvm-svn: 156384
57 lines
1.6 KiB
ReStructuredText
57 lines
1.6 KiB
ReStructuredText
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
|
|
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.
|
|
|
|
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
|
|
diagnostics are produced for globals which only appear in one module
|
|
or the other.
|
|
|
|
**llvm-diff** 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.
|
|
|
|
**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
|
|
attributes, are not diagnosed.
|
|
|
|
Changes in memory behavior (for example, coalescing loads) can cause
|
|
massive detected differences in blocks.
|