Chris Lattner 079236d1c9 My faith in programmers has been found to be totally misplaced. One would ... assume that if they don't intend to write to a global variable, that they would mark it as constant. However, there are people that don't understand that the compiler can do nice things for them if they give it the information it needs. This pass looks for blatently obvious globals that are only ever read from. Though it uses a trivially simple "alias analysis" of sorts, it is still able to do amazing things to important benchmarks. 253.perlbmk, for example, contains several ***GIANT*** function pointer tables that are not marked constant and should be. Marking them constant allows the optimizer to turn a whole bunch of indirect calls into direct calls. Note that only a link-time optimizer can do this transformation, but perlbmk does have several strings and other minor globals that can be marked constant by this pass when run from GCCAS. 176.gcc has a ton of strings and large tables that are marked constant, both at compile time (38 of them) and at link time (48 more). Other benchmarks give similar results, though it seems like big ones have disproportionally more than small ones. This pass is extremely quick and does good things. I'm going to enable it in gccas & gccld. Not bad for 50 SLOC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11836 91177308-0d34-0410-b5e6-96231b3b80d8		2004-02-25 21:34:36 +00:00
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ConstantMerge.cpp	Merging constants can cause further room for improvement. Iterate until	2003-12-28 07:19:08 +00:00
DeadArgumentElimination.cpp	rename the "exceptional" destination of an invoke instruction to the 'unwind' dest	2004-02-08 21:44:31 +00:00
DeadTypeElimination.cpp	Finegrainify namespacification	2003-11-21 21:54:22 +00:00
ExtractFunction.cpp	Finegrainify namespacification	2003-11-21 21:54:22 +00:00
FunctionResolution.cpp	Start using the new and improve interface to FunctionType arguments	2004-02-09 04:14:01 +00:00
GlobalDCE.cpp	Finegrainify namespacification	2003-11-21 21:54:22 +00:00
GlobalOpt.cpp	My faith in programmers has been found to be totally misplaced. One would	2004-02-25 21:34:36 +00:00
Inliner.cpp	Finegrainify namespacification	2003-11-21 21:45:31 +00:00
Inliner.h	Put all LLVM code into the llvm namespace, as per bug 109.	2003-11-11 22:41:34 +00:00
InlineSimple.cpp	Considering that CI is not even IN SCOPE here, I wooda thought the compiler	2003-11-21 21:57:29 +00:00
Internalize.cpp	Finegrainify namespacification	2003-11-21 21:54:22 +00:00
IPConstantPropagation.cpp	Finegrainify namespacification	2003-11-21 21:54:22 +00:00
LowerSetJmp.cpp	rename the "exceptional" destination of an invoke instruction to the 'unwind' dest	2004-02-08 21:44:31 +00:00
Makefile	Added LLVM copyright notice to Makefiles.	2003-10-20 22:26:57 +00:00
MutateStructTypes.cpp	Adjust to the changed StructType interface. In particular, getElementTypes() is gone.	2004-02-09 04:37:31 +00:00
Parallelize.cpp	Finegrainify namespacification	2003-11-21 21:54:22 +00:00
PruneEH.cpp	Intrinsic functions cannot throw	2004-02-13 16:46:46 +00:00
RaiseAllocations.cpp	Implement RaiseAllocations/FreeCastConstantExpr.ll	2003-12-07 01:42:08 +00:00
SimpleStructMutation.cpp	Don't depend on auto data conversion	2004-02-09 05:16:30 +00:00