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LLVM backend for 6502
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Jakob Stoklund Olesen fcad79671f Compute secondary sub-registers. 
The sub-registers explicitly listed in SubRegs in the .td files form a
tree. In a complicated register bank, it is possible to have
sub-register relationships across sub-trees. For example, the ARM NEON
double vector Q0_Q1 is a tree:

  Q0_Q1 = [Q0, Q1],  Q0 = [D0, D1], Q1 = [D2, D3]

But we also define the DPair register D1_D2 = [D1, D2] which is fully
contained in Q0_Q1.

This patch teaches TableGen to find such sub-register relationships, and
assign sub-register indices to them. In the example, TableGen will
create a dsub_1_dsub_2 sub-register index, and add D1_D2 as a
sub-register of Q0_Q1.

This will eventually enable the coalescer to handle copies of skewed
sub-registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156587 91177308-0d34-0410-b5e6-96231b3b80d8
2012-05-10 23:27:10 +00:00
autoconf Revert r156393, "[tests] Remove some remaining DejaGNU related cruft.", this 2012-05-08 18:26:07 +00:00
bindings [python] Add negative MemoryBuffer testcase 2012-03-22 11:23:52 +00:00
cmake Adding -fcolor-diagnostics is causing problem to users that parse the build 2012-05-08 18:11:06 +00:00
docs change the objectsize intrinsic signature: add a 3rd parameter to denote the maximum runtime performance penalty that the user is willing to accept. 2012-05-09 15:52:43 +00:00
examples Remove llvm-ld and llvm-stub (which is only used by llvm-ld). 2012-04-19 19:27:54 +00:00
include Teach DeadStoreElimination to eliminate exit-block stores with phi addresses. 2012-05-10 18:57:38 +00:00
lib objectsize: add support for GEPs with non-constant indexes 2012-05-10 23:17:35 +00:00
projects Update all outdated autoconf files in the sample project. 2012-05-05 15:02:39 +00:00
runtime Switch to c-style comments in a C file. 2012-04-27 19:30:29 +00:00
test objectsize: add support for GEPs with non-constant indexes 2012-05-10 23:17:35 +00:00
tools Do not install llvm-config-host for cross-builds of clang. rdar://11317847 2012-05-09 00:07:02 +00:00
unittests Add unittests for Triple::getMacOSXVersion and Triple::getiOSVersion. 2012-05-09 19:31:41 +00:00
utils Compute secondary sub-registers. 2012-05-10 23:27:10 +00:00
.gitignore Add tools/lld to .gitignore. 2012-05-02 21:25:32 +00:00
CMakeLists.txt Make it possible to switch off solution folders. VS Express does not support 2012-05-09 15:10:54 +00:00
configure Revert r156393, "[tests] Remove some remaining DejaGNU related cruft.", this 2012-05-08 18:26:07 +00:00
CREDITS.TXT Update the documentation of CellSPU, in case it gets removed in 3.1. 2012-04-29 20:00:55 +00:00
LICENSE.TXT Add YAML parser to Support. 2012-04-03 23:09:22 +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 Do not install llvm-config-host for cross-builds of clang. rdar://11317847 2012-05-09 00:07:02 +00:00
Makefile.common Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
Makefile.config.in Make IntelJITEvents and OProfileJIT as optional libraries and add 2012-05-07 19:38:40 +00:00
Makefile.rules Make IntelJITEvents and OProfileJIT as optional libraries and add 2012-05-07 19:38:40 +00:00
README.txt test commit 2012-03-20 13:12:38 +00:00

README.txt 

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

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Please see the HTML documentation provided in docs/index.html for further
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