Dehao Chen fd167cf907 Enable vectorizer-maximize-bandwidth by default. ... Summary: vectorizer-maximize-bandwidth is generally useful in terms of performance. I've tested the impact of changing this to default on speccpu benchmarks on sandybridge machines. The result shows non-negative impact: spec/2006/fp/C++/444.namd 26.84 -0.31% spec/2006/fp/C++/447.dealII 46.19 +0.89% spec/2006/fp/C++/450.soplex 42.92 -0.44% spec/2006/fp/C++/453.povray 38.57 -2.25% spec/2006/fp/C/433.milc 24.54 -0.76% spec/2006/fp/C/470.lbm 41.08 +0.26% spec/2006/fp/C/482.sphinx3 47.58 -0.99% spec/2006/int/C++/471.omnetpp 22.06 +1.87% spec/2006/int/C++/473.astar 22.65 -0.12% spec/2006/int/C++/483.xalancbmk 33.69 +4.97% spec/2006/int/C/400.perlbench 33.43 +1.70% spec/2006/int/C/401.bzip2 23.02 -0.19% spec/2006/int/C/403.gcc 32.57 -0.43% spec/2006/int/C/429.mcf 40.35 +0.27% spec/2006/int/C/445.gobmk 26.96 +0.06% spec/2006/int/C/456.hmmer 24.4 +0.19% spec/2006/int/C/458.sjeng 27.91 -0.08% spec/2006/int/C/462.libquantum 57.47 -0.20% spec/2006/int/C/464.h264ref 46.52 +1.35% geometric mean +0.29% The regression on 453.povray seems real, but is due to secondary effects as all hot functions are bit-identical with and without the flag. I started this patch to consult upstream opinions on this. It will be greatly appreciated if the community can help test the performance impact of this change on other architectures so that we can decided if this should be target-dependent. Reviewers: hfinkel, mkuper, davidxl, chandlerc Reviewed By: chandlerc Subscribers: rengolin, sanjoy, javed.absar, bjope, dorit, magabari, RKSimon, llvm-commits, mzolotukhin Differential Revision: https://reviews.llvm.org/D33341 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306336 91177308-0d34-0410-b5e6-96231b3b80d8		2017-06-26 21:41:09 +00:00
..
Analysis	[CFL-AA] Remove unneeded function declaration. NFCI.	2017-06-26 03:55:41 +00:00
AsmParser
BinaryFormat	Replace trivial use of external rc.exe by writing our own .res file.	2017-06-26 17:43:30 +00:00
Bitcode
CodeGen	RenameIndependentSubregs: Fix iterator problem	2017-06-26 21:33:36 +00:00
DebugInfo	[DWARF] NFC: Give DwarfFormat a 1-byte base type.	2017-06-26 19:52:32 +00:00
Demangle
ExecutionEngine	[ORC] Re-apply r306166 and r306168 with fix for regression test.	2017-06-23 23:25:28 +00:00
Fuzzer
IR	[IR] Rename BinaryOperator::init to AssertOK and remove argument. Replace default case in switch with llvm_unreachable since all valid opcodes are covered.	2017-06-26 07:15:59 +00:00
IRReader
LineEditor
Linker
LTO	[ThinLTO] Remove unnecessary include of Linker.h (NFC)	2017-06-22 16:18:48 +00:00
MC	Simplify the processFixupValue interface. NFC.	2017-06-24 06:00:03 +00:00
Object	Replace trivial use of external rc.exe by writing our own .res file.	2017-06-26 17:43:30 +00:00
ObjectYAML	[codeview] respect signedness of APSInts when printing to YAML	2017-06-21 22:31:52 +00:00
Option	[GSoC] Flag value completion for clang	2017-06-20 16:31:31 +00:00
Passes	[PGO] Implementate profile counter regiser promotion	2017-06-25 00:26:43 +00:00
ProfileData	[ProfileData, Support] Fix some Clang-tidy modernize-use-using and Include What You Use warnings; other minor fixes (NFC).	2017-06-21 23:19:47 +00:00
Support	Add support for Ananas platform	2017-06-25 08:19:37 +00:00
TableGen
Target	Fix the bug when handling shufflevector for aarch64.	2017-06-26 21:33:51 +00:00
Testing
ToolDrivers	[GSoC] Flag value completion for clang	2017-06-20 16:31:31 +00:00
Transforms	Enable vectorizer-maximize-bandwidth by default.	2017-06-26 21:41:09 +00:00
XRay
CMakeLists.txt
LLVMBuild.txt