Benjamin Kramer eba5ed591b Cache the hash value of the operands in the MDNode. ... FoldingSet is implemented as a chained hash table. When there is a hash collision during insertion, which is common as we fill the table until a load factor of 2.0 is hit, we walk the chained elements, comparing every operand with the new element's operands. This can be very expensive if the MDNode has many operands. We sacrifice a word of space in MDNode to cache the full hash value, reducing compares on collision to a minimum. MDNode grows from 28 to 32 bytes + operands on x86. On x86_64 the new bits fit nicely into existing padding, not growing the struct at all. The actual speedup depends a lot on the test case and is typically between 1% and 2% for C++ code with clang -c -O0 -g. llvm-svn: 154497		2012-04-11 14:06:54 +00:00
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Analysis	Add two statistics to help track how we are computing the inline cost.	2012-04-11 10:15:10 +00:00
Archive	Include cstdio in a few place that depended on getting it transitively through StringExtras.h	2012-03-23 11:35:30 +00:00
AsmParser	Convert assert(0) to llvm_unreachable	2012-02-07 05:05:23 +00:00
Bitcode	llvm::SwitchInst	2012-03-11 06:09:17 +00:00
CodeGen	Reapply 154397. Original message:	2012-04-11 08:26:11 +00:00
DebugInfo	Fix a C++11 UDL conflict.	2012-04-04 20:33:56 +00:00
ExecutionEngine	EngineBuilder::create is expected to take ownership of the TargetMachine passed to it. Delete it on error or when we create an interpreter that doesn't need it.	2012-04-08 14:53:14 +00:00
Linker	It's possible for two types, which are isomorphic, to be added to the	2012-03-23 23:17:38 +00:00
MC	Compute hashes directly with hash_combine instead of taking a detour through FoldingSetNodeID.	2012-04-11 14:06:39 +00:00
Object	Add a constructor for DataRefImpl and remove excess initialization.	2012-04-10 01:54:44 +00:00
Support	FoldingSet: Push the hash through FoldingSetTraits::Equals, so clients can use it.	2012-04-11 14:06:47 +00:00
TableGen	Fix infinite loop in nested multiclasses.	2012-03-07 16:39:35 +00:00
Target	remove unused argument	2012-04-11 11:05:21 +00:00
Transforms	Add two statistics to help track how we are computing the inline cost.	2012-04-11 10:15:10 +00:00
VMCore	Cache the hash value of the operands in the MDNode.	2012-04-11 14:06:54 +00:00
CMakeLists.txt	Move TableGen's parser and entry point into a library	2011-10-01 16:41:13 +00:00
LLVMBuild.txt	LLVMBuild: Introduce a common section which currently has a list of the	2011-12-12 22:45:54 +00:00
Makefile	Remove more of llvmc and dependencies.	2011-09-20 00:34:27 +00:00