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1bc7315c02
llvm-6502/test/Transforms/GVN
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Shuxin Yang 1bc7315c02 GVN proceeds in the presence of dead code. 
This is how it ignores the dead code:
1) When a dead branch target, say block B, is identified, all the
    blocks dominated by B is dead as well.

2) The PHIs of those blocks in dominance-frontier(B) is updated such
   that the operands corresponding to dead predecessors are replaced
   by "UndefVal".

   Using lattice's jargon, the "UndefVal" is the "Top" in essence.
   Phi node like this "phi(v1 bb1, undef xx)" will be optimized into
   "v1" if v1 is constant, or v1 is an instruction which dominate this
   PHI node.

3) When analyzing the availability of a load L, all dead mem-ops which
   L depends on disguise as a load which evaluate exactly same value as L.

4) The dead mem-ops will be materialized as "UndefVal" during code motion.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191017 91177308-0d34-0410-b5e6-96231b3b80d8
2013-09-19 17:22:51 +00:00
..
2007-07-25-DominatedLoop.ll
2007-07-25-InfiniteLoop.ll
2007-07-25-Loop.ll
2007-07-25-NestedLoop.ll
2007-07-25-SinglePredecessor.ll
2007-07-26-InterlockingLoops.ll GVN proceeds in the presence of dead code. 2013-09-19 17:22:51 +00:00
2007-07-26-NonRedundant.ll
2007-07-26-PhiErasure.ll
2007-07-30-PredIDom.ll
2007-07-31-NoDomInherit.ll
2007-07-31-RedundantPhi.ll
2008-02-12-UndefLoad.ll
2008-02-13-NewPHI.ll
2008-07-02-Unreachable.ll GVN proceeds in the presence of dead code. 2013-09-19 17:22:51 +00:00
2008-12-09-SelfRemove.ll
2008-12-12-RLE-Crash.ll
2008-12-14-rle-reanalyze.ll
2008-12-15-CacheVisited.ll
2009-01-21-SortInvalidation.ll
2009-01-22-SortInvalidation.ll
2009-02-17-LoadPRECrash.ll
2009-03-10-PREOnVoid.ll
2009-06-17-InvalidPRE.ll
2009-07-13-MemDepSortFail.ll
2009-11-12-MemDepMallocBitCast.ll
2010-03-31-RedundantPHIs.ll
2010-05-08-OneBit.ll
2010-11-13-Simplify.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
2011-04-27-phioperands.ll
2011-06-01-NonLocalMemdepMiscompile.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
2011-07-07-MatchIntrinsicExtract.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
2011-09-07-TypeIdFor.ll
2012-05-22-PreCrash.ll
atomic.ll
basic.ll
bitcast-of-call.ll
calls-nonlocal.ll
calls-readonly.ll
commute.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
cond_br2.ll GVN proceeds in the presence of dead code. 2013-09-19 17:22:51 +00:00
cond_br.ll GVN proceeds in the presence of dead code. 2013-09-19 17:22:51 +00:00
condprop.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
crash-no-aa.ll
crash.ll
edge.ll Catch more CHECK that can be converted to CHECK-LABEL in Transforms for easier debugging. No functionality change. 2013-07-14 01:50:49 +00:00
fpmath.ll
lifetime-simple.ll
load-constant-mem.ll
load-pre-align.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
load-pre-licm.ll
local-pre.ll GVN proceeds in the presence of dead code. 2013-09-19 17:22:51 +00:00
lpre-call-wrap-2.ll
lpre-call-wrap.ll
malloc-load-removal.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
MemdepMiscompile.ll
non-local-offset.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
nonescaping-malloc.ll
null-aliases-nothing.ll
phi-translate-partial-alias.ll
phi-translate.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
pr10820.ll
pr12979.ll
pr14166.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
pre-basic-add.ll
pre-compare.ll
pre-load.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
pre-single-pred.ll
preserve-tbaa.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
range.ll
readattrs.ll Catch more CHECK that can be converted to CHECK-LABEL in Transforms for easier debugging. No functionality change. 2013-07-14 01:50:49 +00:00
rle-must-alias.ll
rle-no-phi-translate.ll
rle-nonlocal.ll GVN proceeds in the presence of dead code. 2013-09-19 17:22:51 +00:00
rle-phi-translate.ll Update Transforms tests to use CHECK-LABEL for easier debugging. No functionality change. 2013-07-14 01:42:54 +00:00
rle-semidominated.ll GVN proceeds in the presence of dead code. 2013-09-19 17:22:51 +00:00
rle.ll GVN proceeds in the presence of dead code. 2013-09-19 17:22:51 +00:00
tbaa.ll
unreachable_block_infinite_loop.ll Fix unchecked uses of DominatorTree in MemoryDependenceAnalysis. 2013-05-06 02:07:24 +00:00