Tim Northover 984ee65445 X86: elide comparisons after cmpxchg instructions. ...

The C++ and C semantics of the compare_and_swap operations actually
require us to return a boolean "success" value. In LLVM terms this
means a second comparison of the output of "cmpxchg" against the input
desired value.

However, x86's "cmpxchg" instruction sets all flags for the comparison
formed, so we can skip any secondary comparison. (N.b. this isn't true
for cmpxchg8b/16b, which only set ZF).

rdar://problem/13201607

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210523 91177308-0d34-0410-b5e6-96231b3b80d8

2014-06-10 10:49:07 +00:00

..

Analysis

Removing an "if (!this)" check from two print methods. The condition will

2014-06-09 22:53:16 +00:00

AsmParser

Allow aliases to be unnamed_addr.

2014-06-06 01:20:28 +00:00

Bitcode

Allow aliases to be unnamed_addr.

2014-06-06 01:20:28 +00:00

CodeGen

Removing an "if (!this)" check from two print methods. The condition will

2014-06-09 22:53:16 +00:00

DebugInfo

[modules] Add module maps for LLVM. These are not quite ready for prime-time

2014-05-21 02:46:14 +00:00

ExecutionEngine

Add a Constant version of stripPointerCasts.

2014-06-04 19:01:48 +00:00

IR

Reorder Value and User fields to save 8 bytes of padding on 64-bit

2014-06-09 23:32:20 +00:00

IRReader

[C++11] More 'nullptr' conversion. In some cases just using a boolean check instead of comparing to nullptr.

2014-04-15 06:32:26 +00:00

LineEditor

[CMake] Use LINK_LIBS instead of target_link_libraries().

2014-02-26 06:41:29 +00:00

Linker

Allow aliases to be unnamed_addr.

2014-06-06 01:20:28 +00:00

LTO

Build fix: remove initializeJumpInstrTablesPass() call from LTO

2014-06-07 20:39:53 +00:00

MC

Fix gcc warning (enumeral and non-enumeral type in conditional expression)

2014-06-09 07:35:07 +00:00

Object

[yaml2obj][obj2yaml] Support ELF symbol's visibility flags (default/hidden/protected).

2014-06-06 07:41:57 +00:00

Option

Options: Use erase_if to remove Args from the list.

2014-05-18 15:14:13 +00:00

ProfileData

Use an enum class.

2014-06-03 05:12:33 +00:00

Support

APFloat: x - NaN needs to flip the signbit of NaN when x is a number.

2014-06-08 16:53:31 +00:00

TableGen

Fix typos in tablegen error messages

2014-05-31 05:18:52 +00:00

Target

X86: elide comparisons after cmpxchg instructions.

2014-06-10 10:49:07 +00:00

Transforms

Removing an "if (!this)" check from two print methods. The condition will

2014-06-09 22:53:16 +00:00

CMakeLists.txt

ProfileData: Introduce the InstrProfReader interface and a text reader

2014-03-21 17:24:48 +00:00

LLVMBuild.txt

ProfileData: Introduce the InstrProfReader interface and a text reader

2014-03-21 17:24:48 +00:00

Makefile

ProfileData: Introduce the InstrProfReader interface and a text reader

2014-03-21 17:24:48 +00:00