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Add fast register allocator, enabled with -regalloc=fast.

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So far this is just a clone of -regalloc=local that has been lobotomized to run
25% faster. It drops the least-recently-used calculations, and is just plain
stupid when it runs out of registers.

The plan is to make this go even faster for -O0 by taking advantage of the short
live intervals in unoptimized code. It should not be necessary to calculate
liveness when most virtual registers are killed 2-3 instructions after they are
born.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102006 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-04-21 18:02:42 +00:00
parent 9cdb4109d5
commit 00207237dd
4 changed files with 1114 additions and 0 deletions
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1
lib/CodeGen/CMakeLists.txt
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@@ -50,6 +50,7 @@ add_llvm_library(LLVMCodeGen
ProcessImplicitDefs.cpp
PrologEpilogInserter.cpp
PseudoSourceValue.cpp
RegAllocFast.cpp
RegAllocLinearScan.cpp
RegAllocLocal.cpp
RegAllocPBQP.cpp

1107
lib/CodeGen/RegAllocFast.cpp Normal file
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