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Richard Sandiford 4850b2341b [SystemZ] Rework handling of constant PC-relative operands 
The GNU assembler treats things like:

        brasl   %r14, 100

in the same way as:

        brasl   %r14, .+100

rather than as a branch to absolute address 100.  We implemented this in
LLVM by creating an immediate operand rather than the usual expr operand,
and by handling immediate operands specially in the code emitter.
This was undesirable for (at least) three reasons:

- the specialness of immediate operands was exposed to the backend MC code,
  rather than being limited to the assembler parser.

- in disassembly, an immediate operand really is an absolute address.
  (Note that this means reassembling printed disassembly can't recreate
  the original code.)

- it would interfere with any assembly manipulation that we might
  try in future.  E.g. operations like branch shortening can change
  the relative position of instructions, but any code that updates
  sym+offset addresses wouldn't update an immediate "100" operand
  in the same way as an explicit ".+100" operand.

This patch changes the implementation so that the assembler creates
a "." label for immediate PC-relative operands, so that the operand
to the MCInst is always the absolute address.  The patch also adds
some error checking of the offset.

llvm-svn: 181773
2013-05-14 09:47:26 +00:00
autoconf We're in 3.4 land now. 2013-05-07 20:31:28 +00:00
bindings We're in 3.4 land now. 2013-05-07 20:31:28 +00:00
cmake [SystemZ] Add configure bits 2013-05-06 16:22:34 +00:00
docs Better output for long help strings for command-line options. 2013-05-10 17:15:51 +00:00
examples Remove exception handling support from the old JIT. 2013-05-07 20:53:59 +00:00
include Remove the MachineMove class. 2013-05-13 01:16:13 +00:00
lib [SystemZ] Rework handling of constant PC-relative operands 2013-05-14 09:47:26 +00:00
projects [SystemZ] Add to --enable-targets=all 2013-05-06 16:23:07 +00:00
runtime Remove GCDAProfiling.c. This copy is old, the copy in compiler-rt is newer and 2013-03-07 02:03:08 +00:00
test [SystemZ] Rework handling of constant PC-relative operands 2013-05-14 09:47:26 +00:00
tools Remove the MachineMove class. 2013-05-13 01:16:13 +00:00
unittests Fix a bug that APFloat::fusedMultiplyAdd() mistakenly evaluate "14.5f * -14.5f + 225.0f" to 225.0f. 2013-05-13 18:03:12 +00:00
utils Add libcxx and clang-tools-extra to the testing thing. 2013-05-08 09:31:10 +00:00
.arcconfig Add .arcconfig to the repository. Useful if someone wants to use phabricator's command line tool. 2012-12-01 12:07:58 +00:00
.gitignore Add extra vim swap file pattern 2012-10-09 23:48:34 +00:00
CMakeLists.txt Change version to 3.4 in the cmake build too. 2013-05-07 20:44:22 +00:00
CODE_OWNERS.TXT Add myself as SystemZ code owner 2013-05-08 14:41:29 +00:00
configure We're in 3.4 land now. 2013-05-07 20:31:28 +00:00
CREDITS.TXT Test commit. 2013-05-09 12:32:36 +00:00
LICENSE.TXT Add LICENSE.TXT covering contributions made by ARM. 2013-01-07 10:04:49 +00:00
llvm.spec.in Tidy up. s/Low Level Virtual Machine/LLVM/. 2012-01-25 22:00:23 +00:00
LLVMBuild.txt LLVMBuild: Introduce a common section which currently has a list of the 2011-12-12 22:45:54 +00:00
Makefile Improved svn repo searching for 'make update' 2013-01-28 03:19:57 +00:00
Makefile.common Makefile.common: Update a description, s/Source/SOURCES/ , according to MakefileGuide.html#control-variables . 2012-12-07 01:43:23 +00:00
Makefile.config.in Add basic zlib support to LLVM. This would allow to use compression/uncompression in selected LLVM tools. 2013-04-23 08:28:39 +00:00
Makefile.rules Remove this hack. We can support this better with function attributes. 2013-05-03 21:53:50 +00:00
README.txt test 2013-04-17 05:34:03 +00:00

README.txt 

Low Level Virtual Machine (LLVM)
================================

This directory and its subdirectories contain source code for the Low Level
Virtual Machine, a toolkit for the construction of highly optimized compilers,
optimizers, and runtime environments.

LLVM is open source software. You may freely distribute it under the terms of
the license agreement found in LICENSE.txt.

Please see the documentation provided in docs/ for further
assistance with LLVM, and in particular docs/GettingStarted.rst for getting
started with LLVM and docs/README.txt for an overview of LLVM's
documentation setup.

If you're writing a package for LLVM, see docs/Packaging.rst for our
suggestions.