replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
hanchenye-llvm-project/clang
History
Bradley Smith 9ff64332a0 [AArch64] Add workaround for Cortex-A53 erratum (835769) 
Some early revisions of the Cortex-A53 have an erratum (835769) whereby it is
possible for a 64-bit multiply-accumulate instruction in AArch64 state to
generate an incorrect result.  The details are quite complex and hard to
determine statically, since branches in the code may exist in some
circumstances, but all cases end with a memory (load, store, or prefetch)
instruction followed immediately by the multiply-accumulate operation.

The safest work-around for this issue is to make the compiler avoid emitting
multiply-accumulate instructions immediately after memory instructions and the
simplest way to do this is to insert a NOP.

This patch implements clang options to enable this workaround in the backend.

The work-around code generation is not enabled by default.

llvm-svn: 219604
 		2014-10-13 10:16:06 +00:00
..
INPUTS
…
bindings Add libclang capabilities to retriete template arguments from specializations. 2014-10-10 20:01:05 +00:00
docs Fix documentation typo. 2014-10-10 16:09:48 +00:00
examples Driver: Update clang-interpreter example for r218938 2014-10-03 01:08:27 +00:00
include [AArch64] Add workaround for Cortex-A53 erratum (835769) 2014-10-13 10:16:06 +00:00
lib [AArch64] Add workaround for Cortex-A53 erratum (835769) 2014-10-13 10:16:06 +00:00
runtime Unify the name of compiler-rt builtins library on Linux. 2014-05-22 21:13:30 +00:00
test [AArch64] Add workaround for Cortex-A53 erratum (835769) 2014-10-13 10:16:06 +00:00
tools Correctly handle reading locations from serialized diagnostics 2014-10-10 22:20:26 +00:00
unittests clang-format: [ObjC] Wrap ObjC method declarations before annotations. 2014-10-11 08:24:56 +00:00
utils Allow constant expressions in pragma loop hints. 2014-10-12 20:46:07 +00:00
www Tests for DR600-640. 2014-09-29 06:03:56 +00:00
.arcconfig
…
.clang-format
…
.clang-tidy Add .clang-tidy configuration file to provide LLVM-optimized defaults for clang-tidy. 2014-09-08 13:33:32 +00:00
.gitignore
…
CMakeLists.txt Make clang's rewrite engine a core feature 2014-07-16 16:48:33 +00:00
CODE_OWNERS.TXT Every code owner should be reachable via email, so add one for 2014-09-12 08:05:51 +00:00
INSTALL.txt
…
LICENSE.TXT
…
Makefile
…
ModuleInfo.txt
…
NOTES.txt Remove trailing spaces 2014-07-13 17:11:45 +00:00
README.txt Remove whitespace from test commit. 2014-07-16 19:10:36 +00:00

README.txt 

//===----------------------------------------------------------------------===//
// C Language Family Front-end
//===----------------------------------------------------------------------===//

Welcome to Clang.  This is a compiler front-end for the C family of languages
(C, C++, Objective-C, and Objective-C++) which is built as part of the LLVM
compiler infrastructure project.

Unlike many other compiler frontends, Clang is useful for a number of things
beyond just compiling code: we intend for Clang to be host to a number of
different source-level tools.  One example of this is the Clang Static Analyzer.

If you're interested in more (including how to build Clang) it is best to read
the relevant web sites.  Here are some pointers:

Information on Clang:              http://clang.llvm.org/
Building and using Clang:          http://clang.llvm.org/get_started.html
Clang Static Analyzer:             http://clang-analyzer.llvm.org/
Information on the LLVM project:   http://llvm.org/

If you have questions or comments about Clang, a great place to discuss them is
on the Clang development mailing list:
  http://lists.cs.uiuc.edu/mailman/listinfo/cfe-dev

If you find a bug in Clang, please file it in the LLVM bug tracker:
  http://llvm.org/bugs/