Sanjay Patel 1cbefe8aa1 [SimplifyCFG] don't create a no-op subtract ...

I noticed this inefficiency while investigating PR34603:
https://bugs.llvm.org/show_bug.cgi?id=34603

This fix will likely push another bug (we don't maintain state of 'LateSimplifyCFG') 
into hiding, but I'll try to clean that up with a follow-up patch anyway.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@313829 91177308-0d34-0410-b5e6-96231b3b80d8

2017-09-20 22:31:35 +00:00

..

AArch64

[SimplifyCFG] Rewrite SinkThenElseCodeToEnd

2016-08-22 19:07:15 +00:00

AMDGPU

AMDGPU: Remove -mcpu=SI

2017-08-07 18:30:35 +00:00

ARM

[ARM] Implement isTruncateFree

2017-09-18 14:28:51 +00:00

Hexagon

[SimplifyCFG] Make the no-jump-tables attribute also disable switch lookup tables

2017-07-28 22:25:40 +00:00

Mips

[MIPS] add overrides for isCheapToSpeculateCttz() and isCheapToSpeculateCtlz()

2015-11-11 17:24:56 +00:00

PowerPC

[CodeGenPrepare] Removed duplicate logic. SimplifyCFG already knows how to speculate calls to cttz/ctlz.

2015-02-13 14:15:48 +00:00

SPARC

Reduce verbiage of lit.local.cfg files

2014-06-09 22:42:55 +00:00

X86

[SimplifyCFG] don't create a no-op subtract

2017-09-20 22:31:35 +00:00

2002-05-21-PHIElimination.ll

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2002-09-24-PHIAssertion.ll

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2003-03-07-DominateProblem.ll

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2003-08-05-InvokeCrash.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

2003-08-17-BranchFold.ll

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2003-08-17-BranchFoldOrdering.ll

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2003-08-17-FoldSwitch-dbg.ll

[opaque pointer type] Add textual IR support for explicit type parameter to gep operator

2015-03-13 18:20:45 +00:00

2003-08-17-FoldSwitch.ll

regenerate checks

2016-03-28 22:12:21 +00:00

2004-12-10-SimplifyCFGCrash.ll

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2005-06-16-PHICrash.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2005-08-01-PHIUpdateFail.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

2005-10-02-InvokeSimplify.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

2005-12-03-IncorrectPHIFold.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2006-02-17-InfiniteUnroll.ll

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2006-06-12-InfLoop.ll

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2006-08-03-Crash.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2006-10-19-UncondDiv.ll

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2006-12-08-Ptr-ICmp-Branch.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2007-11-22-InvokeNoUnwind.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

2007-12-21-Crash.ll

[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction

2015-04-16 23:24:18 +00:00

2008-01-02-hoist-fp-add.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2008-05-16-PHIBlockMerge.ll

[SimlifyCFG] Prevent passes from destroying canonical loop structure, especially for nested loops

2016-03-29 04:08:57 +00:00

2008-07-13-InfLoopMiscompile.ll

remove the metadata added with r267827

2016-04-30 00:02:36 +00:00

2008-09-08-MultiplePred.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2008-09-17-SpeculativeHoist.ll

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2008-10-03-SpeculativelyExecuteBeforePHI.ll

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2008-12-06-SingleEntryPhi.ll

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2008-12-16-DCECond.ll

[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction

2015-04-16 23:24:18 +00:00

2009-01-18-PHIPropCrash.ll

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2009-05-12-externweak.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

2010-03-30-InvokeCrash.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

2011-03-08-UnreachableUse.ll

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2011-09-05-TrivialLPad.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

assume.ll

Add @llvm.assume, lowering, and some basic properties

2014-07-25 21:13:35 +00:00

attr-convergent.ll

[SimplifyCFG] Don't fold conditional branches that contain calls to convergent functions.

2016-02-12 21:01:36 +00:00

attr-noduplicate.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

basictest.ll

[Verifier] Add verification for TBAA metadata

2016-12-11 20:07:15 +00:00

branch-cond-merge.ll

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branch-cond-prop.ll

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branch-fold-dbg.ll

Remove the obsolete offset parameter from @llvm.dbg.value

2017-07-28 20:21:02 +00:00

branch-fold-test.ll

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branch-fold-threshold.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

branch-fold.ll

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branch-phi-thread.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

BrUnwind.ll

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bug-25299.ll

[SimplifyCFG] Extend SimplifyResume to handle phi of trivial landing pad.

2016-01-10 05:48:01 +00:00

clamp.ll

[SimplifyCFG] Add test for r229099

2015-02-13 11:08:40 +00:00

combine-parallel-mem-md.ll

[SimplifyCFG] Preserve !llvm.mem.parallel_loop_access when merging

2016-04-26 02:06:06 +00:00

common-dest-folding.ll

[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction

2015-04-16 23:24:18 +00:00

ConditionalTrappingConstantExpr.ll

[Constant] remove fdiv and frem from canTrap()

2016-08-29 15:27:17 +00:00

CoveredLookupTable.ll

Split the SimplifyCFG pass into two variants.

2017-03-26 06:44:08 +00:00

critedge-assume.ll

Add address space mangling to lifetime intrinsics

2017-04-10 20:18:21 +00:00

dbginfo.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

dce-cond-after-folding-terminator.ll

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DeadSetCC.ll

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div-rem-pairs.ll

[SimplifyCFG] update test comments; NFC

2017-09-12 23:28:11 +00:00

duplicate-landingpad.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

duplicate-phis.ll

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empty-catchpad.ll

[WinEH] Simplify unreachable catchpads

2016-01-05 02:37:41 +00:00

empty-cleanuppad.ll

Add address space mangling to lifetime intrinsics

2017-04-10 20:18:21 +00:00

EmptyBlockMerge.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

EqualPHIEdgeBlockMerge.ll

[SimlifyCFG] Prevent passes from destroying canonical loop structure, especially for nested loops

2016-03-29 04:08:57 +00:00

extract-cost.ll

Add ExtractValue instruction to SimplifyCFG's ComputeSpeculationCost

2014-05-09 17:02:46 +00:00

ForwardSwitchConditionToPHI.ll

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gepcost.ll

[TTI] Fix getGEPCost() for geps with a single operand.

2017-09-01 19:54:08 +00:00

guards.ll

[SimplifyCFG] Fold llvm.guard(false) to unreachable

2016-04-21 05:09:12 +00:00

hoist-common-code.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

hoist-dbgvalue.ll

Remove the obsolete offset parameter from @llvm.dbg.value

2017-07-28 20:21:02 +00:00

hoist-with-range.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

HoistCode.ll

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implied-and-or.ll

[ValueTracking] Support icmps fed by 'and' and 'or'.

2017-07-06 20:00:25 +00:00

implied-cond-matching-false-dest.ll

[ValueTracking] Improve isImpliedCondition when the dominating cond is false.

2016-04-25 17:23:36 +00:00

implied-cond-matching-imm.ll

[ValueTracking] Improve isImpliedCondition for matching LHS and Imm RHSs.

2016-05-05 15:39:18 +00:00

implied-cond-matching.ll

Fix typo from r267432.

2016-04-25 18:20:27 +00:00

implied-cond.ll

[SimplifyCFG] Constant fold a branch implied by it's incoming edge

2015-10-29 03:11:49 +00:00

indirectbr.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

InfLoop.ll

[SimplifyCFG] Fix for "endless" loop after dead code removal (Alternative to

2016-02-03 23:54:25 +00:00

inline-asm-sink.ll

[SimplifyCFG] Be even more conservative in SinkThenElseCodeToEnd

2016-09-11 09:00:03 +00:00

invoke_unwind.ll

[SimplifyCFG] Extend SimplifyResume to handle phi of trivial landing pad.

2016-01-10 05:48:01 +00:00

invoke.ll

Revert "[SimplifyCFG] Stop inserting calls to llvm.trap for UB"

2016-06-25 08:19:55 +00:00

iterative-simplify.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

lifetime.ll

Add address space mangling to lifetime intrinsics

2017-04-10 20:18:21 +00:00

MagicPointer.ll

[opaque pointer type] Add textual IR support for explicit type parameter to gep operator

2015-03-13 18:20:45 +00:00

merge-cleanuppads.ll

[SimplifyCFG] Merge together cleanuppads

2016-02-20 01:07:45 +00:00

merge-cond-stores-2.ll

Tweak unnamed label syntax in textual IR for easier matching in tests.

2016-01-27 21:53:08 +00:00

merge-cond-stores.ll

[SimplifyCFG] Fix the determination of PostBB in conditional store merging to handle the targets on the second branch being commuted

2017-04-21 15:53:42 +00:00

multiple-phis.ll

[SimplifyCFG] Defer folding unconditional branches to LateSimplifyCFG if it can destroy canonical loop structure.

2017-07-19 08:53:34 +00:00

no_speculative_loads_with_asan.ll

[asan] Disabling speculative loads under asan. Patch by Mike Aizatsky

2015-10-14 00:21:05 +00:00

no_speculative_loads_with_tsan.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

no-md-sink.ll

[SimplifyCFG] Don't try to create metadata-valued PHIs

2016-09-07 21:38:22 +00:00

noreturn-call.ll

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phi-undef-loadstore.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

PhiBlockMerge2.ll

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PhiBlockMerge.ll

regenerate checks

2016-03-28 22:12:21 +00:00

PhiEliminate2.ll

propagate 'unpredictable' metadata on select instructions

2016-03-17 15:30:52 +00:00

PhiEliminate3.ll

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PhiEliminate.ll

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PHINode.ll

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PhiNoEliminate.ll

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pr33605.ll

[SimplifyCFG] Defer folding unconditional branches to LateSimplifyCFG if it can destroy canonical loop structure.

2017-07-19 08:53:34 +00:00

pr34131.ll

[SimplifyCFG] remove checks for crasher test from r310481

2017-08-09 18:56:26 +00:00

PR9946.ll

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PR16069.ll

regenerate checks

2016-03-28 22:12:21 +00:00

PR17073.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

PR25267.ll

[SimplifyCFG] Don't use-after-free an SSA value

2015-10-21 18:22:24 +00:00

PR27615-simplify-cond-br.ll

Canonicalize the representation of empty an expression in DIGlobalVariableExpression

2017-08-30 18:06:51 +00:00

PR29163.ll

[SimplifyCFG] Hoisting invalidates metadata

2016-08-29 17:14:08 +00:00

PR30210.ll

Add a test for r280191

2016-09-16 02:43:36 +00:00

preserve-branchweights-partial.ll

IR: Make metadata typeless in assembly

2014-12-15 19:07:53 +00:00

preserve-branchweights-switch-create.ll

IR: Make metadata typeless in assembly

2014-12-15 19:07:53 +00:00

preserve-branchweights.ll

Follow-up patch of http://reviews.llvm.org/D19948 to handle missing profiles when simplifying CFG.

2016-05-18 22:41:03 +00:00

preserve-llvm-loop-metadata.ll

[SimplifyCFG] Defer folding unconditional branches to LateSimplifyCFG if it can destroy canonical loop structure.

2017-07-19 08:53:34 +00:00

preserve-load-metadata-2.ll

Preserve load alignment and dereferenceable metadata during some transformations

2015-11-02 17:53:51 +00:00

preserve-load-metadata-3.ll

Preserve load alignment and dereferenceable metadata during some transformations

2015-11-02 17:53:51 +00:00

preserve-load-metadata.ll

Preserve load alignment and dereferenceable metadata during some transformations

2015-11-02 17:53:51 +00:00

preserve-make-implicit-on-switch-to-br.ll

[ConstantFoldTerminator] Preserve make.implicit metadata when converting SwitchInst to BranchInst

2015-08-07 19:30:12 +00:00

preserve-store-alignment.ll

[SimplifyCFG] Fix for PR34219: Preserve alignment after merging conditional stores.

2017-08-29 20:06:24 +00:00

rangereduce.ll

[SimplifyCFG] don't create a no-op subtract

2017-09-20 22:31:35 +00:00

remove-debug-2.ll

[InstCombine] Merge DebugLoc when speculatively hoisting store instruction

2017-01-28 07:05:43 +00:00

remove-debug.ll

Remove debug info when hoisting instruction from then/else branch.

2016-09-08 21:53:33 +00:00

return-merge.ll

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seh-nounwind.ll

Move the personality function from LandingPadInst to Function

2015-06-17 20:52:32 +00:00

select-gep.ll

[opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction

2015-02-27 19:29:02 +00:00

sink-common-code.ll

Remove the obsolete offset parameter from @llvm.dbg.value

2017-07-28 20:21:02 +00:00

speculate-call.ll

[ValueTracking] Teach isSafeToSpeculativelyExecute() about the speculatable attribute

2017-04-28 21:13:09 +00:00

speculate-math.ll

Revert "Revert "[SimplifyCFG] allow speculation of exactly one expensive instruction (PR24818)""

2016-01-27 02:59:41 +00:00

speculate-store.ll

[SimplifyCFG] propagate branch metadata when creating select (PR26636)

2016-03-26 23:30:50 +00:00

speculate-vector-ops.ll

Make bitcast, extractelement, and insertelement considered cheap for speculation.

2014-05-30 18:34:43 +00:00

speculate-with-offset.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

SpeculativeExec.ll

Revert "Revert "Strip metadata when speculatively hoisting instructions (r252604)"

2015-11-18 14:50:18 +00:00

statepoint-invoke-unwind.ll

[gc.statepoint] Change gc.statepoint intrinsic's return type to token type instead of i32 type

2015-12-26 07:54:32 +00:00

switch_create.ll

opt: Rename -default-data-layout flag to -data-layout and make it always override the layout.

2017-02-17 17:36:52 +00:00

switch_switch_fold.ll

use FileCheck for tighter checking

2016-03-16 23:39:37 +00:00

switch_thread.ll

reduce check strings; no need to check IR comments

2016-03-16 23:22:01 +00:00

switch-dead-default.ll

Revert @llvm.assume with operator bundles (r289755-r289757)

2016-12-19 08:22:17 +00:00

switch-masked-bits.ll

[SimplifyCFG] eliminate switch cases based on known range of switch condition

2016-05-20 14:53:09 +00:00

switch-on-const-select.ll

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switch-range-to-icmp.ll

SimplifyCFG: don't remove unreachable default switch destinations

2015-01-26 19:52:32 +00:00

switch-simplify-crash.ll

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switch-to-br.ll

Add some tests for SimplifyCFG's ConstantFoldTerminator(). NFC.

2014-12-04 22:19:25 +00:00

switch-to-icmp.ll

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switch-to-select-multiple-edge-per-block-phi.ll

[SimplifyCFG] auto-generate better checks; NFC

2016-11-25 21:12:39 +00:00

switch-to-select-two-case.ll

[SimplifyCFG] auto-generate better checks; NFC

2016-11-25 21:12:39 +00:00

trap-debugloc.ll

Revert "[SimplifyCFG] Stop inserting calls to llvm.trap for UB"

2016-06-25 08:19:55 +00:00

trapping-load-unreachable.ll

Revert "[SimplifyCFG] Stop inserting calls to llvm.trap for UB"

2016-06-25 08:19:55 +00:00

two-entry-phi-return.ll

[SimplifyCFG] propagate branch metadata when creating select (PR27344)

2016-04-15 15:32:12 +00:00

UncondBranchToReturn.ll

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unreachable-blocks.ll

[opaque pointer type] Add textual IR support for explicit type parameter to load instruction

2015-02-27 21:17:42 +00:00

unreachable-cleanuppad.ll

[SimplifyCFG] Do not blindly remove unreachable blocks

2016-02-24 10:02:16 +00:00

UnreachableEliminate.ll

[SimplifyCFG] Replace calls to null/undef with unreachable

2016-06-25 07:37:27 +00:00

volatile-phioper.ll

[opaque pointer type] Add textual IR support for explicit type parameter to the call instruction

2015-04-16 23:24:18 +00:00

wineh-unreachable.ll

[SimplifyCFG] Further improve our ability to remove redundant catchpads

2016-01-05 07:42:17 +00:00