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llvm-mirror/test/Transforms/GVN
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Philip Reames 70941d66be Allow value forwarding past release fences in GVN 
A release fence acts as a publication barrier for stores within the current thread to become visible to other threads which might observe the release fence. It does not require the current thread to observe stores performed on other threads. As a result, we can allow store-load and load-load forwarding across a release fence.  

We choose to be much more conservative about stores.  In theory, nothing prevents us from shifting a store from after a release fence to before it, and then eliminating the preceeding (previously fenced) store.  Doing this without actually moving the second store is likely also legal, but we chose to be conservative at this time.

The LangRef indicates only atomic loads and stores are effected by fences. This patch chooses to be far more conservative then that. 

This is the GVN companion to http://reviews.llvm.org/D11434 which applied the same logic in EarlyCSE and has been baking in tree for a while now.

Differential Revision: http://reviews.llvm.org/D11436

llvm-svn: 264472
2016-03-25 22:40:35 +00:00
..
2007-07-25-DominatedLoop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-25-InfiniteLoop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-25-Loop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-25-NestedLoop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-25-SinglePredecessor.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-26-InterlockingLoops.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2007-07-26-NonRedundant.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-26-PhiErasure.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-30-PredIDom.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2007-07-31-NoDomInherit.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2007-07-31-RedundantPhi.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-02-12-UndefLoad.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2008-02-13-NewPHI.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-07-02-Unreachable.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-12-09-SelfRemove.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-12-12-RLE-Crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2008-12-14-rle-reanalyze.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2008-12-15-CacheVisited.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-01-21-SortInvalidation.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-01-22-SortInvalidation.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-02-17-LoadPRECrash.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
2009-03-10-PREOnVoid.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
2009-06-17-InvalidPRE.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-07-13-MemDepSortFail.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2009-11-12-MemDepMallocBitCast.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2010-03-31-RedundantPHIs.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
2010-05-08-OneBit.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
2010-11-13-Simplify.ll
2011-04-27-phioperands.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2011-06-01-NonLocalMemdepMiscompile.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
2011-07-07-MatchIntrinsicExtract.ll
2011-09-07-TypeIdFor.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
2012-05-22-PreCrash.ll
assume-equal.ll Fix for two constant propagation problems in GVN with the assume intrinsic 2016-01-21 21:32:35 +00:00
atomic.ll MemoryDependenceAnalysis: Don't miscompile atomics 2015-03-21 06:19:17 +00:00
basic-undef-test.ll Update BasicAliasAnalysis to understand that nothing aliases with undef values. 2015-05-05 18:10:49 +00:00
basic.ll [PM] Port GVN to the new pass manager, wire it up, and teach a couple of 2016-03-11 08:50:55 +00:00
bitcast-of-call.ll
br-identical.ll GVN: If a branch has two identical successors, we cannot declare either dead. 2015-06-25 18:32:02 +00:00
calloc-load-removal.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
calls-nonlocal.ll
calls-readonly.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
commute.ll
cond_br2.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
cond_br.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
condprop.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
crash-no-aa.ll [PM/AA] Rebuild LLVM's alias analysis infrastructure in a way compatible 2015-09-09 17:55:00 +00:00
crash.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
edge.ll only propagate equality comparisons of FP values that we are certain are non-zero 2015-02-25 22:46:08 +00:00
fence.ll Allow value forwarding past release fences in GVN 2016-03-25 22:40:35 +00:00
fpmath.ll IR: Make metadata typeless in assembly 2014-12-15 19:07:53 +00:00
funclet.ll [IR] Reformulate LLVM's EH funclet IR 2015-12-12 05:38:55 +00:00
invariant-load.ll [PRE] Preserve !invariant.load metadata 2015-11-17 00:15:09 +00:00
invariant.group.ll inariant.group handling in GVN 2015-10-02 22:12:22 +00:00
lifetime-simple.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-constant-mem.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-from-unreachable-predecessor.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-pre-align.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-pre-licm.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
load-pre-nonlocal.ll DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
local-pre.ll
lpre-call-wrap-2.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
lpre-call-wrap.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
malloc-load-removal.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
MemdepMiscompile.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
no_speculative_loads_with_asan.ll Disable gvn non-local speculative loads under asan. 2015-11-18 20:43:00 +00:00
noalias.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
non-local-offset.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
nonescaping-malloc.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
null-aliases-nothing.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
phi-translate-partial-alias.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
phi-translate.ll DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
pr10820.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
pr12979.ll [GVN] Intersect the IR flags when CSE'ing two instructions 2015-06-24 21:52:25 +00:00
pr14166.ll [PM/AA] Rebuild LLVM's alias analysis infrastructure in a way compatible 2015-09-09 17:55:00 +00:00
pr17732.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
pr17852.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
pr24397.ll [PHITransAddr] Don't assume that instruction operands are translatable 2015-08-09 15:43:02 +00:00
pr24426.ll Preserve CFG in MergedLoadStoreMotion. This fixes PR24426. 2015-10-18 19:34:10 +00:00
pr25440.ll Fix bug 25440: GVN assertion after coercing loads 2015-11-19 02:45:18 +00:00
pre-basic-add.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
pre-compare.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
pre-gep-load.ll [PM] Port GVN to the new pass manager, wire it up, and teach a couple of 2016-03-11 08:50:55 +00:00
pre-load.ll [IR] Reformulate LLVM's EH funclet IR 2015-12-12 05:38:55 +00:00
pre-new-inst.ll GVN: tolerate an instruction being replaced without existing in the leaderboard 2015-07-14 21:03:18 +00:00
pre-no-cost-phi.ll Allow PRE to insert no-cost phi nodes 2015-02-03 20:37:08 +00:00
pre-single-pred.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
preserve-tbaa.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
range.ll [GVN] Make a test case more robust 2015-10-28 03:20:05 +00:00
readattrs.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle-must-alias.ll [opaque pointer type] Add textual IR support for explicit type parameter to the call instruction 2015-04-16 23:24:18 +00:00
rle-no-phi-translate.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle-nonlocal.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle-phi-translate.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle-semidominated.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
rle.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
tbaa.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
unreachable_block_infinite_loop.ll [PHITransAddr] Don't translate unreachable values 2015-06-01 00:15:08 +00:00
volatile-nonvolatile.ll More detailed dependence test between volatile and non-volatile accesses 2016-02-22 23:07:43 +00:00
volatile.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00