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Jingyue Wu 41c8aefa76 SelectionDAG: Prefer to combine multiplication with less uses for fma 
Summary:
For example:

  s6 = s0*s5;
  s2 = s6*s6 + s6;
  ...
  s4 = s6*s3;

We notice that it is possible for s2 is folded to fma (s0, s5, fmul (s6 s6)).
This only happens when Aggressive is true, otherwise hasOneUse() check
already prevents from folding the multiplication with more uses.

Test Plan: test/CodeGen/NVPTX/fma-assoc.ll

Patch by Xuetian Weng

Reviewers: hfinkel, apazos, jingyue, ohsallen, arsenm

Subscribers: arsenm, jholewinski, llvm-commits

Differential Revision: http://reviews.llvm.org/D11855

llvm-svn: 244649
2015-08-11 19:21:46 +00:00
autoconf We're actually -Wmissing-field-initializers clean thanks to the cmake 2015-08-07 16:44:47 +00:00
bindings Revert "Fix llvm-config to emit the linker flag for the combined shared object built by autoconfig/make instead of the individual components." 2015-08-05 20:03:26 +00:00
cmake Revert "[cmake] Add helper for finding potentially external projects" 2015-08-11 19:02:57 +00:00
docs [libFuzzer] fix docs build 2015-08-11 04:16:37 +00:00
examples [PM/AA] Hoist the interface for BasicAA into a header file. 2015-08-06 07:33:15 +00:00
include Revert "Add non-member begin and end so that drop_begin works on iterator_range." 2015-08-11 16:26:06 +00:00
lib SelectionDAG: Prefer to combine multiplication with less uses for fma 2015-08-11 19:21:46 +00:00
projects build: make libunwind a proper project 2015-04-25 01:47:39 +00:00
resources In MSVC builds embed a VERSIONINFO resource in our exe and DLL files. 2015-06-12 15:58:29 +00:00
test SelectionDAG: Prefer to combine multiplication with less uses for fma 2015-08-11 19:21:46 +00:00
tools [llvm-symbolizer] Remove underscores and other C mangling on Windows 2015-08-10 21:47:11 +00:00
unittests Fix UB in MCJIT test cases that relied on union type punning 2015-08-11 18:17:45 +00:00
utils Explicitly clear the MI operand list when getInstruction() is called. Call MI.clear() within MCD::OPC_Decode case and inside of translateInstruction() for the X86 target. Remove now unnecessary MI.clear() from ARMDisassembler. 2015-08-11 01:15:07 +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 Minor updates to gitignore so that symlinks are ignored in the projects dir. 2015-07-07 20:24:58 +00:00
CMakeLists.txt Re-apply "cmake: Make CMAKE_BUILD_TYPE check case-insensitive" 2015-08-11 18:17:41 +00:00
CODE_OWNERS.TXT [WebAssembly] Initial WebAssembly backend 2015-06-29 23:51:55 +00:00
configure We're actually -Wmissing-field-initializers clean thanks to the cmake 2015-08-07 16:44:47 +00:00
CREDITS.TXT [WebAssembly] Initial WebAssembly backend 2015-06-29 23:51:55 +00:00
LICENSE.TXT Update for a new year. 2015-03-12 01:25:29 +00:00
llvm.spec.in [Sparc] Implement i64 load/store support for 32-bit sparc. 2015-08-10 19:11:39 +00:00
LLVMBuild.txt Remove the very substantial, largely unmaintained legacy PGO 2013-10-02 15:42:23 +00:00
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 We're actually -Wmissing-field-initializers clean thanks to the cmake 2015-08-07 16:44:47 +00:00
Makefile.rules We're actually -Wmissing-field-initializers clean thanks to the cmake 2015-08-07 16:44:47 +00:00
README.txt Revert test commit at revision 233535. 2015-03-30 12:39:03 +00:00

README.txt 

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

This directory and its subdirectories contain source code for LLVM,
a toolkit for the construction of highly optimized compilers,
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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
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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.