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
..
Analysis	Add @llvm.assume, lowering, and some basic properties	2014-07-25 21:13:35 +00:00
AsmParser
Bitcode	UseListOrder: Visit global values	2014-07-30 17:51:09 +00:00
CodeGen	Refactor duplicated code.	2014-07-30 19:42:16 +00:00
DebugInfo
ExecutionEngine	[MCJIT] Fix the ARM BR24 relocation in RuntimeDyldMachO.	2014-07-30 03:35:05 +00:00
IR	Feedback on r214189, no functionality change.	2014-07-29 22:58:13 +00:00
IRReader
LineEditor
Linker
LTO	Refactor duplicated code.	2014-07-30 19:42:16 +00:00
MC
Object
Option
ProfileData	llvm-profdata: Clean up and reorganize some tests	2014-07-29 22:29:23 +00:00
Support	Remove dead code.	2014-07-25 19:06:39 +00:00
TableGen
Target	Add rfdi and rfmci from the e500/e500mc ISA.	2014-07-30 21:09:03 +00:00
Transforms	InstCombine: Simplify (A ^ B) or/and (A ^ B ^ C)	2014-07-30 21:26:37 +00:00
CMakeLists.txt
LLVMBuild.txt
Makefile