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LLVM backend for 6502
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4d628e200f
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Chandler Carruth 4d628e200f We really want to hash pairs of directly-hashable data as directly 
hashable data. This matters when we have pair<T*, U*> as a key, which is
quite common in DenseMap, etc. To that end, we need to detect when this
is safe. The requirements on a generic std::pair<T, U> are:

1) Both T and U must satisfy the existing is_hashable_data trait. Note
   that this includes the requirement that T and U have no internal
   padding bits or other bits not contributing directly to equality.
2) The alignment constraints of std::pair<T, U> do not require padding
   between consecutive objects.
3) The alignment constraints of U and the size of T do not conspire to
   require padding between the first and second elements.

Grow two somewhat magical traits to detect this by forming a pod
structure and inspecting offset artifacts on it. Hopefully this won't
cause any compilers to panic.

Added and adjusted tests now that pairs, even nested pairs, are treated
as just sequences of data.

Thanks to Jeffrey Yasskin for helping me sort through this and reviewing
the somewhat subtle traits.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151883 91177308-0d34-0410-b5e6-96231b3b80d8
2012-03-02 09:26:36 +00:00
autoconf Enable -Wcovered-switch-default again, but add -Werror to the checks to make 2012-02-28 23:32:06 +00:00
bindings ocaml bindings: landing pad is now the last opcode. 2012-02-07 18:58:19 +00:00
cmake Minimal changes for LLVM to compile under VS11. 2012-03-01 22:42:52 +00:00
docs rplace Alpha with ARM in docs/WritingAnLLVMBackend.html, patch by chenwj 2012-03-01 15:14:19 +00:00
examples Switch to a more idiomatic way of silencing unused variable warnings in 2012-02-20 00:02:49 +00:00
include We really want to hash pairs of directly-hashable data as directly 2012-03-02 09:26:36 +00:00
lib Prevent obscure and incorrect tail-call optimization. 2012-03-02 02:50:46 +00:00
projects Enable -Wcovered-switch-default again, but add -Werror to the checks to make 2012-02-28 23:32:06 +00:00
runtime Fixing a warning in MSVC (this is also a test commit) 2012-02-05 19:43:39 +00:00
test Prevent obscure and incorrect tail-call optimization. 2012-03-02 02:50:46 +00:00
tools [Object] 2012-03-01 22:19:54 +00:00
unittests We really want to hash pairs of directly-hashable data as directly 2012-03-02 09:26:36 +00:00
utils Move getSubRegIndex out of generated code into MCRegisterInfo, devirtualize it. 2012-03-01 18:16:35 +00:00
.gitignore git: Add tools/lldb to the ignore list. 2011-11-10 22:55:50 +00:00
CMakeLists.txt add LLVM_VERSION_MAJOR and _MINOR defines 2012-02-13 18:48:10 +00:00
configure Enable -Wcovered-switch-default again, but add -Werror to the checks to make 2012-02-28 23:32:06 +00:00
CREDITS.TXT Add myself to the credits file 2012-02-29 16:43:11 +00:00
LICENSE.TXT Happy new year 2012! 2012-01-01 08:16:56 +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 Makefile: add missing files to FilesToConfig 2012-01-17 02:56:49 +00:00
Makefile.common Removed trailing whitespace from Makefiles. 2009-01-09 16:44:42 +00:00
Makefile.config.in Enable -Wcovered-switch-default again, but add -Werror to the checks to make 2012-02-28 23:32:06 +00:00
Makefile.rules Enable -Wcovered-switch-default again, but add -Werror to the checks to make 2012-02-28 23:32:06 +00:00
README.txt test commit 2012-02-07 08:18:05 +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 HTML documentation provided in docs/index.html for further
assistance with LLVM.

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