JF Bastien 6470102728 Accelerate MergeFunctions with hashing ... This patch makes the Merge Functions pass faster by calculating and comparing a hash value which captures the essential structure of a function before performing a full function comparison. The hash is calculated by hashing the function signature, then walking the basic blocks of the function in the same order as the main comparison function. The opcode of each instruction is hashed in sequence, which means that different functions according to the existing total order cannot have the same hash, as the comparison requires the opcodes of the two functions to be the same order. The hash function is a static member of the FunctionComparator class because it is tightly coupled to the exact comparison function used. For example, functions which are equivalent modulo a single variant callsite might be merged by a more aggressive MergeFunctions, and the hash function would need to be insensitive to these differences in order to exploit this. The hashing function uses a utility class which accumulates the values into an internal state using a standard bit-mixing function. Note that this is a different interface than a regular hashing routine, because the values to be hashed are scattered amongst the properties of a llvm::Function, not linear in memory. This scheme is fast because only one word of state needs to be kept, and the mixing function is a few instructions. The main runOnModule function first computes the hash of each function, and only further processes functions which do not have a unique function hash. The hash is also used to order the sorted function set. If the hashes differ, their values are used to order the functions, otherwise the full comparison is done. Both of these are helpful in speeding up MergeFunctions. Together they result in speedups of 9% for mysqld (a mostly C application with little redundancy), 46% for libxul in Firefox, and 117% for Chromium. (These are all LTO builds.) In all three cases, the new speed of MergeFunctions is about half that of the module verifier, making it relatively inexpensive even for large LTO builds with hundreds of thousands of functions. The same functions are merged, so this change is free performance. Author: jrkoenig Reviewers: nlewycky, dschuff, jfb Subscribers: llvm-commits, aemerson Differential revision: http://reviews.llvm.org/D11923 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@245140 91177308-0d34-0410-b5e6-96231b3b80d8		2015-08-15 01:18:18 +00:00
..
ArgumentPromotion.cpp	Use foreach loops for StructType::elements(). NFC.	2015-07-24 18:55:49 +00:00
BarrierNoopPass.cpp
CMakeLists.txt
ConstantMerge.cpp
DeadArgumentElimination.cpp
ElimAvailExtern.cpp	Remove unused variable.	2015-07-13 14:43:33 +00:00
ExtractGV.cpp
FunctionAttrs.cpp	Remove unused variable. NFC.	2015-07-24 19:18:32 +00:00
GlobalDCE.cpp	Rangify for loops in GlobalDCE, NFC.	2015-07-18 19:57:34 +00:00
GlobalOpt.cpp	Revert "Improve merging of stores from static constructors in GlobalOpt"	2015-07-22 22:26:54 +00:00
InlineAlways.cpp
Inliner.cpp	Variable names should start with an upper case letter; NFC	2015-08-11 16:05:43 +00:00
InlineSimple.cpp
Internalize.cpp	Internalize: internalize comdat members as a group, and drop comdat on such members.	2015-07-16 17:42:21 +00:00
IPConstantPropagation.cpp
IPO.cpp
LLVMBuild.txt
LoopExtractor.cpp	Drive-by fixes for LandingPad -> EHPad	2015-08-04 08:21:40 +00:00
LowerBitSets.cpp	LowerBitSets: Add debugging output.	2015-07-29 18:12:36 +00:00
Makefile
MergeFunctions.cpp	Accelerate MergeFunctions with hashing	2015-08-15 01:18:18 +00:00
PartialInlining.cpp
PassManagerBuilder.cpp	[PM/AA] Extract the interface for GlobalsModRef into a header along with	2015-08-14 03:48:20 +00:00
PruneEH.cpp
StripDeadPrototypes.cpp
StripSymbols.cpp