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Nirav Dave da8f221273 Elide stores which are overwritten without being observed. 
Summary:
In SelectionDAG, when a store is immediately chained to another store
to the same address, elide the first store as it has no observable
effects. This is causes small improvements dealing with intrinsics
lowered to stores.

Test notes:

* Many testcases overwrite store addresses multiple times and needed
  minor changes, mainly making stores volatile to prevent the
  optimization from optimizing the test away.

* Many X86 test cases optimized out instructions associated with
  associated with va_start.

* Note that test_splat in CodeGen/AArch64/misched-stp.ll no longer has
  dependencies to check and can probably be removed and potentially
  replaced with another test.

Reviewers: rnk, john.brawn

Subscribers: aemerson, rengolin, qcolombet, jyknight, nemanjai, nhaehnle, javed.absar, llvm-commits

Differential Revision: https://reviews.llvm.org/D33206

llvm-svn: 303198
 		2017-05-16 19:43:56 +00:00
..
2009-07-17-CrossRegClassCopy.ll
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2009-07-21-ISelBug.ll
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2009-07-23-CPIslandBug.ll
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2009-07-30-PEICrash.ll
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2009-08-01-WrongLDRBOpc.ll
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2009-08-02-CoalescerBug.ll
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2009-08-04-CoalescerAssert.ll
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2009-08-04-CoalescerBug.ll
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2009-08-04-ScavengerAssert.ll
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2009-08-04-SubregLoweringBug.ll
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2009-08-04-SubregLoweringBug2.ll
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2009-08-04-SubregLoweringBug3.ll
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2009-08-06-SpDecBug.ll
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2009-08-07-CoalescerBug.ll
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2009-08-07-NeonFPBug.ll
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2009-08-08-ScavengerAssert.ll
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2009-08-10-ISelBug.ll
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2009-08-21-PostRAKill4.ll
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2009-09-01-PostRAProlog.ll
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2009-09-28-ITBlockBug.ll
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2009-10-15-ITBlockBranch.ll
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2009-11-01-CopyReg2RegBug.ll
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2009-11-11-ScavengerAssert.ll
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2009-11-13-STRDBug.ll
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2009-12-01-LoopIVUsers.ll
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2010-01-06-TailDuplicateLabels.ll
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2010-01-19-RemovePredicates.ll
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2010-02-11-phi-cycle.ll
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2010-02-24-BigStack.ll
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2010-03-08-addi12-ccout.ll
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2010-03-15-AsmCCClobber.ll
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2010-04-15-DynAllocBug.ll
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2010-04-26-CopyRegCrash.ll
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2010-05-24-rsbs.ll
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2010-06-14-NEONCoalescer.ll
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2010-06-19-ITBlockCrash.ll
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2010-06-21-TailMergeBug.ll
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2010-08-10-VarSizedAllocaBug.ll
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2010-11-22-EpilogueBug.ll
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2010-12-03-AddSPNarrowing.ll
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2011-04-21-FILoweringBug.ll
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2011-06-07-TwoAddrEarlyClobber.ll
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2011-12-16-T2SizeReduceAssert.ll
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2012-01-13-CBNZBug.ll
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2013-02-19-tail-call-register-hint.ll
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2013-03-02-vduplane-nonconstant-source-index.ll
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2013-03-06-vector-sext-operand-scalarize.ll
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aapcs.ll
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aligned-constants.ll
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aligned-spill.ll
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bfi.ll
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bfx.ll
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bicbfi.ll
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buildvector-crash.ll
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carry.ll
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cbnz.ll CodeGen: Allow small copyable blocks to "break" the CFG. 2017-01-31 23:48:32 +00:00
constant-islands-jump-table.ll
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constant-islands-new-island-padding.ll
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constant-islands-new-island.ll
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constant-islands.ll
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cortex-fp.ll
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crash.ll
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cross-rc-coalescing-1.ll
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cross-rc-coalescing-2.ll
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div.ll
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emit-unwinding.ll
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float-cmp.ll [ARM] Use VCMP, not VCMPE, for floating point equality comparisons 2017-02-13 12:32:47 +00:00
float-intrinsics-double.ll ARM: match GCC's behaviour for builtins 2017-01-13 16:25:33 +00:00
float-intrinsics-float.ll ARM: match GCC's behaviour for builtins 2017-01-13 16:25:33 +00:00
float-ops.ll [Thumb] Teach ISel how to lower compares of AND bitmasks efficiently 2016-12-15 09:38:59 +00:00
frame-pointer.ll Re-land "[Thumb] Save/restore high registers in Thumb1 pro/epilogues" 2016-10-11 21:14:03 +00:00
frameless.ll
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frameless2.ll
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ifcvt-compare.ll CodeGen: Allow small copyable blocks to "break" the CFG. 2017-01-31 23:48:32 +00:00
ifcvt-neon.ll
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ifcvt-rescan-bug-2016-08-22.ll Add address space mangling to lifetime intrinsics 2017-04-10 20:18:21 +00:00
ifcvt-rescan-diamonds.ll
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inflate-regs.ll
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inlineasm.ll
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intrinsics-cc.ll ARM: match GCC's behaviour for builtins 2017-01-13 16:25:33 +00:00
intrinsics-coprocessor.ll [ARM] Avoid using ARM instructions in Thumb mode 2017-01-31 14:35:01 +00:00
large-call.ll
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large-stack.ll
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ldr-str-imm12.ll Elide stores which are overwritten without being observed. 2017-05-16 19:43:56 +00:00
lit.local.cfg
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longMACt.ll
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lsr-deficiency.ll
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machine-licm.ll Make the canonicalisation on shifts benifit to more case. 2016-12-23 02:56:07 +00:00
mul_const.ll
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pic-load.ll
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segmented-stacks.ll
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setjmp_longjmp.ll
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stack_guard_remat.ll Add address space mangling to lifetime intrinsics 2017-04-10 20:18:21 +00:00
tail-call-r9.ll
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tbb-removeadd.mir [ARM] Remove a dead ADD during the creation of TBBs 2017-04-06 08:32:47 +00:00
thumb2-adc.ll
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thumb2-add.ll
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thumb2-add2.ll
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thumb2-add3.ll
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thumb2-add4.ll
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thumb2-add5.ll
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thumb2-add6.ll
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thumb2-and.ll
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thumb2-and2.ll
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thumb2-asr.ll
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thumb2-asr2.ll
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thumb2-bcc.ll
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thumb2-bfc.ll
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thumb2-bic.ll
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thumb2-branch.ll
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thumb2-call-tc.ll
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thumb2-call.ll
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thumb2-cbnz.ll
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thumb2-clz.ll
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thumb2-cmn.ll
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thumb2-cmn2.ll
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thumb2-cmp.ll
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thumb2-cmp2.ll
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thumb2-cpsr-liveness.ll
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thumb2-eor.ll
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thumb2-eor2.ll
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thumb2-ifcvt1-tc.ll
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thumb2-ifcvt1.ll
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thumb2-ifcvt2.ll
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thumb2-ifcvt3.ll
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thumb2-jtb.ll [Thumb-1] Synthesize TBB/TBH instructions to make use of compressed jump tables 2016-11-01 13:37:41 +00:00
thumb2-ldm.ll
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thumb2-ldr.ll
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thumb2-ldr_ext.ll
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thumb2-ldr_post.ll
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thumb2-ldr_pre.ll
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thumb2-ldrb.ll
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thumb2-ldrd.ll
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thumb2-ldrh.ll
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thumb2-lsl.ll
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thumb2-lsl2.ll
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thumb2-lsr.ll
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thumb2-lsr2.ll
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thumb2-lsr3.ll
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thumb2-mla.ll
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thumb2-mls.ll
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thumb2-mov.ll
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thumb2-mul.ll
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thumb2-mulhi.ll
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thumb2-mvn.ll
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thumb2-mvn2.ll
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thumb2-neg.ll
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thumb2-orn.ll
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thumb2-orn2.ll
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thumb2-orr.ll
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thumb2-orr2.ll
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thumb2-pack.ll [ARM] Remove t2xtpk feature from tests 2017-03-09 15:14:32 +00:00
thumb2-rev.ll [ARM] Remove t2xtpk feature from tests 2017-03-09 15:14:32 +00:00
thumb2-rev16.ll
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thumb2-ror.ll
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thumb2-rsb.ll
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thumb2-rsb2.ll
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thumb2-sbc.ll
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thumb2-select.ll
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thumb2-select_xform.ll
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thumb2-shifter.ll
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thumb2-smla.ll [ARM] Remove t2xtpk feature from tests 2017-03-09 15:14:32 +00:00
thumb2-smul.ll [ARM] Remove t2xtpk feature from tests 2017-03-09 15:14:32 +00:00
thumb2-spill-q.ll
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thumb2-str.ll
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thumb2-str_post.ll
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thumb2-str_pre.ll
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thumb2-strb.ll
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thumb2-strh.ll
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thumb2-sub.ll
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thumb2-sub2.ll
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thumb2-sub3.ll
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thumb2-sub4.ll
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thumb2-sub5.ll
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thumb2-sxt-uxt.ll [ARM] Replace HasT2ExtractPack with HasDSP 2017-02-17 15:42:44 +00:00
thumb2-sxt_rot.ll [ARM] Replace HasT2ExtractPack with HasDSP 2017-02-17 15:42:44 +00:00
thumb2-tbb.ll [Thumb-1] Synthesize TBB/TBH instructions to make use of compressed jump tables 2016-11-01 13:37:41 +00:00
thumb2-tbh.ll [Thumb-1] Synthesize TBB/TBH instructions to make use of compressed jump tables 2016-11-01 13:37:41 +00:00
thumb2-teq.ll
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thumb2-teq2.ll
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thumb2-tst.ll
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thumb2-tst2.ll
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thumb2-uxt_rot.ll [ARM] Replace HasT2ExtractPack with HasDSP 2017-02-17 15:42:44 +00:00
thumb2-uxtb.ll [ARM] Replace HasT2ExtractPack with HasDSP 2017-02-17 15:42:44 +00:00
tls1.ll
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tls2.ll
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tpsoft.ll
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v8_IT_1.ll
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v8_IT_2.ll
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v8_IT_3.ll
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v8_IT_4.ll CodeGen: Allow small copyable blocks to "break" the CFG. 2017-01-31 23:48:32 +00:00
v8_IT_5.ll [ShrinkWrapping] Handle restores on no-return paths 2017-05-15 23:13:35 +00:00
v8_IT_6.ll
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