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
..
AddrModeMatcher.cpp
BasicBlockUtils.cpp
BasicInliner.cpp
BreakCriticalEdges.cpp
CloneFunction.cpp	Don't bother with sprintf, just pass the Twine through.	2010-01-27 19:58:47 +00:00
CloneLoop.cpp
CloneModule.cpp
CMakeLists.txt
CodeExtractor.cpp
DemoteRegToStack.cpp
InlineFunction.cpp
InstructionNamer.cpp
LCSSA.cpp
Local.cpp	Fix pr6198 by moving the isSized() check to an outer conditional.	2010-02-01 17:41:44 +00:00
LoopSimplify.cpp	Use a SmallSetVector instead of a SetVector; this code showed up as a	2010-02-05 19:20:15 +00:00
LoopUnroll.cpp	Don't bother with sprintf, just pass the Twine through.	2010-01-27 19:58:47 +00:00
LowerInvoke.cpp
LowerSwitch.cpp
Makefile
Mem2Reg.cpp
PromoteMemoryToRegister.cpp	mem2reg erases the dbg.declare intrinsics that it converts to dbg.val intrinsics	2010-01-29 00:01:35 +00:00
SimplifyCFG.cpp	Teach SimplifyCFG about magic pointer constants.	2010-02-05 22:03:18 +00:00
SSAUpdater.cpp	Avoid creating redundant PHIs in SSAUpdater::GetValueInMiddleOfBlock.	2010-01-27 22:01:02 +00:00
SSI.cpp
UnifyFunctionExitNodes.cpp
ValueMapper.cpp