Jakob Stoklund Olesen 58e9ee85fd Teach SimplifyCFG about magic pointer constants. ... Weird code sometimes uses pointer constants other than null. This patch teaches SimplifyCFG to build switch instructions in those cases. Code like this: void f(const char *x) { if (!x) puts("null"); else if ((uintptr_t)x == 1) puts("one"); else if (x == (char*)2 || x == (char*)3) puts("two"); else if ((intptr_t)x == 4) puts("four"); else puts(x); } Now becomes a switch: define void @f(i8* %x) nounwind ssp { entry: %magicptr23 = ptrtoint i8* %x to i64 ; <i64> [#uses=1] switch i64 %magicptr23, label %if.else16 [ i64 0, label %if.then i64 1, label %if.then2 i64 2, label %if.then9 i64 3, label %if.then9 i64 4, label %if.then14 ] Note that LLVM's own DenseMap uses magic pointers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95439 91177308-0d34-0410-b5e6-96231b3b80d8		2010-02-05 22:03:18 +00:00
..
ABCD.cpp	Change errs() to dbgs().	2010-01-05 01:27:39 +00:00
ADCE.cpp	Use do+while instead of while for loops which obviously have a	2010-01-05 16:27:25 +00:00
BasicBlockPlacement.cpp
CMakeLists.txt	move instcombine to its own library, it's past time.	2010-01-04 06:23:24 +00:00
CodeGenPrepare.cpp	Implement releaseMemory in CodeGenPrepare and free the BackEdges	2010-02-05 19:24:11 +00:00
ConstantProp.cpp	remove a bunch of extraneous LLVMContext arguments	2009-11-06 04:27:31 +00:00
DCE.cpp
DeadStoreElimination.cpp	Use do+while instead of while for loops which obviously have a	2010-01-05 16:27:25 +00:00
GEPSplitter.cpp	Check in the experimental GEP splitter pass. This pass splits complex	2009-10-26 19:12:14 +00:00
GVN.cpp	Fix some comment typos.	2010-02-03 00:33:21 +00:00
IndVarSimplify.cpp	Re-implement the main strength-reduction portion of LoopStrengthReduction.	2010-01-21 02:09:26 +00:00
JumpThreading.cpp	third bug from PR6119: the xor dupe extension allows	2010-01-23 19:21:31 +00:00
LICM.cpp	Change errs() to dbgs().	2010-01-05 01:27:30 +00:00
LoopDeletion.cpp	LoopDeletion depends on loops having dedicated exits.	2009-11-05 21:47:04 +00:00
LoopIndexSplit.cpp	Use do+while instead of while for loops which obviously have a	2010-01-05 16:27:25 +00:00
LoopRotation.cpp	Update various Loop optimization passes to cope with the possibility that	2009-11-05 21:11:53 +00:00
LoopStrengthReduce.cpp	Generic reformatting and comment fixing. No functionality change.	2010-01-29 00:52:43 +00:00
LoopUnrollPass.cpp	Change errs() to dbgs().	2010-01-05 01:27:44 +00:00
LoopUnswitch.cpp	fix a crash in loop unswitch on a loop invariant vector condition.	2010-02-02 02:26:54 +00:00
Makefile	make -fno-rtti the default unless a directory builds with REQUIRES_RTTI.	2010-01-24 20:43:08 +00:00
MemCpyOptimizer.cpp	Convert a ton of simple integer type equality tests to the new predicate.	2010-01-05 20:07:06 +00:00
Reassociate.cpp	Do not reassociate expressions with i1 type. SimplifyCFG converts some	2010-02-04 23:32:37 +00:00
Reg2Mem.cpp
Scalar.cpp	remove the now dead condprop pass, PR3906.	2009-11-11 05:56:35 +00:00
ScalarReplAggregates.cpp	Adjust the heuristics used to decide when SROA is likely to be profitable.	2010-02-03 17:23:56 +00:00
SCCP.cpp	Change errs() to dbgs().	2010-01-05 01:27:15 +00:00
SCCVN.cpp	Use do+while instead of while for loops which obviously have a	2010-01-05 16:27:25 +00:00
SimplifyCFGPass.cpp	Teach SimplifyCFG about magic pointer constants.	2010-02-05 22:03:18 +00:00
SimplifyHalfPowrLibCalls.cpp	improve portability to avoid conflicting with std::next in c++'0x.	2009-12-03 00:50:42 +00:00
SimplifyLibCalls.cpp	Recommit this, looks like it wasn't the cause.	2010-02-03 00:21:58 +00:00
TailDuplication.cpp	Change errs() to dbgs().	2010-01-05 01:27:33 +00:00
TailRecursionElimination.cpp	Revert 94937 and move the noreturn check to codegen.	2010-02-03 03:55:59 +00:00