David Majnemer 5624046453 InstCombine: Simplify (A ^ B) or/and (A ^ B ^ C) ... While we can already transform A | (A ^ B) into A | B, things get bad once we have (A ^ B) | (A ^ B ^ Cst) because reassociation will morph this into (A ^ B) | ((A ^ Cst) ^ B). Our existing patterns fail once this happens. To fix this, we add a new pattern which looks through the tree of xor binary operators to see that, in fact, there exists a redundant xor operation. What follows bellow is a correctness proof of the transform using CVC3. $ cat t.cvc A, B, C : BITVECTOR(64); QUERY BVXOR(A, B) | BVXOR(BVXOR(B, C), A) = BVXOR(A, B) | C; QUERY BVXOR(BVXOR(A, C), B) | BVXOR(A, B) = BVXOR(A, B) | C; QUERY BVXOR(A, B) & BVXOR(BVXOR(B, C), A) = BVXOR(A, B) & ~C; QUERY BVXOR(BVXOR(A, C), B) & BVXOR(A, B) = BVXOR(A, B) & ~C; $ cvc3 < t.cvc Valid. Valid. Valid. Valid. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214342 91177308-0d34-0410-b5e6-96231b3b80d8		2014-07-30 21:26:37 +00:00
..
Hello	[CMake] Add LLVM_LINK_COMPONENTS to loadable modules, LLVMHello and BugpointPasses, on Win32.	2014-07-13 13:36:48 +00:00
InstCombine	InstCombine: Simplify (A ^ B) or/and (A ^ B ^ C)	2014-07-30 21:26:37 +00:00
Instrumentation	[Debug Info] add DISubroutineType and its creation takes DITypeArray.	2014-07-28 22:24:06 +00:00
IPO	Fixing a few -Woverloaded-virtual warnings by exposing the hidden virtual function as well. No functional changes intended.	2014-07-30 19:23:59 +00:00
ObjCARC	AA metadata refactoring (introduce AAMDNodes)	2014-07-24 12:16:19 +00:00
Scalar	Fixing a few -Woverloaded-virtual warnings by exposing the hidden virtual function as well. No functional changes intended.	2014-07-30 19:23:59 +00:00
Utils	SimplifyCFG: Avoid miscompilations due to removed lifetime intrinsics.	2014-07-30 21:04:00 +00:00
Vectorize	SLP Vectorizer: Canonicalize tree operands of commutitive binary operands.	2014-07-30 21:07:56 +00:00
CMakeLists.txt	Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.	2013-01-28 01:35:51 +00:00
LLVMBuild.txt	Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.	2013-01-28 01:35:51 +00:00
Makefile	Extracted ObjCARC.cpp into its own library libLLVMObjCARCOpts in preparation for refactoring the ARC Optimizer.	2013-01-28 01:35:51 +00:00