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Mirror of https://github.com/RPCS3/llvm-mirror
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9c01dd36f8
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Juergen Ributzka 9c01dd36f8 [CodeGenPrepare] Split branch conditions into multiple conditional branches. 
This optimization transforms code like:
bb1:
  %0 = icmp ne i32 %a, 0
  %1 = icmp ne i32 %b, 0
  %or.cond = or i1 %0, %1
  br i1 %or.cond, label %TrueBB, label %FalseBB

into a multiple branch instructions like:

bb1:
  %0 = icmp ne i32 %a, 0
  br i1 %0, label %TrueBB, label %bb2
bb2:
  %1 = icmp ne i32 %b, 0
  br i1 %1, label %TrueBB, label %FalseBB

This optimization is already performed by SelectionDAG, but not by FastISel.
FastISel cannot perform this optimization, because it cannot generate new
MachineBasicBlocks.

Performing this optimization at CodeGenPrepare time makes it available to both -
SelectionDAG and FastISel - and the implementation in SelectiuonDAG could be
removed. There are currenty a few differences in codegen for X86 and PPC, so
this commmit only enables it for FastISel.

Reviewed by Jim Grosbach

This fixes rdar://problem/19034919.

llvm-svn: 223786
2014-12-09 16:36:13 +00:00
autoconf Expose LLVM version string via macro in llvm-config.h, and modify Go bindings 2014-11-19 03:34:17 +00:00
bindings Add bindings for the rest of the MCJIT options that we previously 2014-12-02 21:09:01 +00:00
cmake Make GetSVN.cmake do its VCS queries with native CMake code. 2014-12-05 00:50:15 +00:00
docs Add argument variable support to the debug info tutorial 2014-12-09 00:28:24 +00:00
examples Once more on the cmake build. nativecodegen->native on the dependencies. 2014-12-08 18:24:06 +00:00
include Add more pattern matchers for compares, instructions, and BinaryOperators. NFC. 2014-12-09 16:36:10 +00:00
lib [CodeGenPrepare] Split branch conditions into multiple conditional branches. 2014-12-09 16:36:13 +00:00
projects [cmake] Use the external project machinery for libcxxabi so that it can 2014-07-25 10:27:40 +00:00
test [CodeGenPrepare] Split branch conditions into multiple conditional branches. 2014-12-09 16:36:13 +00:00
tools Don't lookup an object symbol name in the module. 2014-12-09 16:13:59 +00:00
unittests IR: Drop uniquing for self-referencing MDNodes 2014-12-07 19:52:06 +00:00
utils Improve emacs coding style 2014-12-09 08:58:31 +00:00
.arcconfig Updated phabricator server. 2014-04-07 03:57:04 +00:00
.clang-format Test commit. 2014-03-02 13:08:46 +00:00
.clang-tidy Enable display of compiler diagnostics in clang-tidy by default. 2014-10-29 17:29:38 +00:00
.gitignore Initial version of Go bindings. 2014-10-16 22:48:02 +00:00
CMakeLists.txt [OCaml] [cmake] Add CMake buildsystem for OCaml. 2014-12-01 19:50:23 +00:00
CODE_OWNERS.TXT Make myself the code owner for llgo. 2014-12-08 20:30:39 +00:00
configure Expose LLVM version string via macro in llvm-config.h, and modify Go bindings 2014-11-19 03:34:17 +00:00
CREDITS.TXT Rise from the dead and update personal info 2014-08-25 17:51:04 +00:00
LICENSE.TXT Remove projects/sample. 2014-03-12 22:40:22 +00:00
llvm.spec.in
LLVMBuild.txt
Makefile [configure/make] Propagate names of build host tools when making BuildTools 2014-03-25 21:45:41 +00:00
Makefile.common
Makefile.config.in Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
Makefile.rules Add a check for misbehaving -Wcomment from gcc-4.7 and add 2014-11-05 00:35:15 +00:00
README.txt [TEST-COMMIT] As per Developer Policy, Added a blank line. 2014-12-06 00:38:39 +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.