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llvm-project/llvm/test/Transforms/InstCombine
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Takashi Idobe 1075a2fa7e
[Instcombine] Write Instcombine pass to strength reduce lock xadd to lock sub (#184715) 
Resolves: https://github.com/llvm/llvm-project/issues/174933

The issue goes into a case where fetch_sub(n) is properly optimized but
fetch_add(neg(n)) is not optimized to the same code.

Although the issue is tagged for x86 I assumed this be best handled
outside of the backends so I put this in InstCombine.
2026-03-21 20:45:29 +00:00
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AArch64
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AMDGPU
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ARM
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Hexagon
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NVPTX
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SystemZ
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2003-09-09-VolatileLoadElim.ll
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2003-10-29-CallSiteResolve.ll
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2004-01-13-InstCombineInvokePHI.ll
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2004-02-23-ShiftShiftOverflow.ll
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2004-03-13-InstCombineInfLoop.ll
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2004-04-04-InstCombineReplaceAllUsesWith.ll
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2008-04-29-VolatileLoadDontMerge.ll
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2008-11-27-IDivVector.ll
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2008-11-27-MultiplyIntVec.ll
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2008-12-17-SRemNegConstVec.ll
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2009-01-08-AlignAlloca.ll
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2009-01-31-InfIterate.ll
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2009-02-04-FPBitcast.ll
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2009-02-11-NotInitialized.ll
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2009-02-20-InstCombine-SROA.ll
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2009-02-21-LoadCST.ll
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2009-02-25-CrashZeroSizeArray.ll
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2009-03-18-vector-ashr-crash.ll
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2011-05-28-swapmulsub.ll
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2011-06-13-nsw-alloca.ll
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2011-09-03-Trampoline.ll
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2011-10-07-AlignPromotion.ll
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2012-3-15-or-xor-constant.ll
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2012-02-13-FCmp.ll
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2012-02-28-ICmp.ll
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2012-03-10-InstCombine.ll
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2012-04-24-vselect.ll
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distribute.ll
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memset-1.ll
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phi-merge-gep.ll
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phi-preserve-ir-flags.ll
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phi-shifts.ll
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phi-with-multiple-unsimplifiable-values.ll
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phi.ll
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pow_fp_int.ll
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pow-1.ll
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pow-2.ll
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pow-3.ll
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pow-4.ll
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pow-cbrt.ll
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pow-exp-nofastmath.ll
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pow-exp.ll
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pow-sqrt.ll
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pow-to-ldexp.ll
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powi.ll
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pr2645-0.ll
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pr2996.ll
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pr12251.ll
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pr35515.ll
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ptr-int-cast.ll
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ptr-int-ptr-icmp.ll
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redundant-left-shift-input-masking-pr49778.ll
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redundant-left-shift-input-masking-variant-a.ll
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redundant-left-shift-input-masking-variant-b.ll
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redundant-left-shift-input-masking-variant-c.ll
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redundant-left-shift-input-masking-variant-d.ll
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redundant-left-shift-input-masking-variant-e.ll
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redundant-left-shift-input-masking-variant-f.ll
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redundant-right-shift-input-masking.ll
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rem-mul-shl.ll
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rem.ll
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remove-loop-phi-multiply-by-zero.ll
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remquo.ll
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remquol-fp80.ll
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remquol-fp128.ll
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remquol-ppc-fp128.ll
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repack-ints-thru-zext.ll
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result-of-add-of-negative-is-non-zero-and-no-underflow.ll
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result-of-add-of-negative-or-zero-is-non-zero-and-no-underflow.ll
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result-of-usub-is-non-zero-and-no-overflow.ll
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reuse-constant-from-select-in-icmp.ll
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rotate.ll
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sadd_sat.ll
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sadd-with-overflow.ll
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saddo.ll
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salvage-dbg-declare.ll
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saturating-add-sub.ll
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scalable-bitcast-inseltpoison.ll
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scalable-bitcast.ll
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scalable-cast-of-alloc.ll
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scalable-const-fp-splat.ll
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scalable-extract-subvec-elt.ll
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scalable-select.ll
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scalable-trunc.ll
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scalable-vector-array.ll
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scalable-vector-struct.ll
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scalar_vector_gep.ll
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scalarization-inseltpoison.ll
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scalarization.ll
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scmp.ll
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sdiv-1.ll
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sdiv-2.ll
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sdiv-canonicalize.ll
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sdiv-exact-by-negative-power-of-two.ll
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sdiv-exact-by-power-of-two.ll
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sdiv-guard.ll
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sdiv-icmp.ll
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sdiv-of-non-negative-by-negative-power-of-two.ll
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select_arithmetic.ll
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select_frexp.ll
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select_meta.ll
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select_with_identical_phi.ll
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select-2.ll
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select-and-cmp.ll
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select-and-or.ll
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select-binop-cmp.ll
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select-binop-foldable-floating-point.ll
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select-bitext-bitwise-ops.ll
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select-bitext.ll
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select-cmp-br.ll
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select-cmp-cttz-ctlz.ll
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select-cmp-eq-op-fold.ll
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select-cmp.ll
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select-cmpxchg.ll
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select-crash.ll
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select-ctlz-to-cttz.ll
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select-divrem.ll
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select-extractelement-inseltpoison.ll
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select-extractelement.ll
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select-factorize.ll
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select-fcmp-fmul-zero-absorbing-value.ll
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select-fixed-zero.ll
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select-gep.ll
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select-icmp-and-zero-shl.ll
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select-icmp-and.ll
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select-icmp-xor.ll
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select-imm-canon.ll
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select-load-call.ll
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select-load.ll
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select-masked_gather.ll
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select-masked_load.ll
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select-min-max.ll
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select-obo-peo-ops.ll
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select-of-bittest.ll
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select-of-symmetric-selects.ll
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select-or-cmp.ll
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select-pr39595.ll
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select-safe-bool-transforms.ll
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select-safe-impliedcond-transforms.ll
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select-safe-transforms.ll
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select-select.ll
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select-to-cmp.ll
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select-value-equivalence.ll
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select-with-bitwise-ops.ll
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select-with-extreme-eq-cond.ll
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select.ll
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set-lowbits-mask-canonicalize.ll
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set.ll
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setcc-strength-reduce.ll
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sext-a-lt-b-plus-zext-a-gt-b-to-uscmp.ll
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sext-and.ll
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sext-nonneg-sub.ll
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sext-of-trunc-nsw.ll
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sext.ll
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shift-add-inseltpoison.ll
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shift-add.ll
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shift-amount-reassociation-in-bittest-with-truncation-lshr.ll
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shift-amount-reassociation-in-bittest-with-truncation-shl.ll
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shift-amount-reassociation-in-bittest.ll
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shift-amount-reassociation-with-truncation-ashr.ll
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shift-amount-reassociation-with-truncation-lshr.ll
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shift-amount-reassociation-with-truncation-shl.ll
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shift-amount-reassociation.ll
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shift-by-signext.ll
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shift-cttz-ctlz.ll
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shift-direction-in-bit-test.ll
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shift-flags.ll
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shift-logic.ll
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shift-shift.ll
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shift-sra.ll
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shift-uminmax.ll
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shift.ll
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shl-and-negC-icmpeq-zero.ll
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shl-and-signbit-icmpeq-zero.ll
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shl-bo.ll
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shl-demand.ll
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shl-factor.ll
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shl-sub.ll
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shl-twice-constant.ll
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shl-unsigned-cmp-const.ll
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should-change-type.ll
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shuffle_select-inseltpoison.ll
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shuffle_select.ll
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shuffle-binop.ll
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shuffle-cast-dist.ll
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shuffle-cast-inseltpoison.ll
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shuffle-cast.ll
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shuffle-select-narrow-inseltpoison.ll
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shuffle-select-narrow.ll
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shufflevec-bitcast-inseltpoison.ll
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shufflevec-bitcast.ll
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shufflevec-constant-inseltpoison.ll
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shufflevec-constant.ll
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shufflevector_freezepoison.ll
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shufflevector-div-rem-inseltpoison.ll
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shufflevector-div-rem.ll
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sign-bit-test-via-right-shifting-all-other-bits.ll
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sign-test-and-or.ll
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signbit-lshr-and-icmpeq-zero.ll
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signbit-shl-and-icmpeq-zero.ll
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signed-comparison.ll
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signed-mul-lack-of-overflow-check-via-mul-sdiv.ll
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signed-mul-overflow-check-via-mul-sdiv.ll
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signed-truncation-check.ll
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signext.ll
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signmask-of-sext-vs-of-shl-of-zext.ll
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simple_phi_condition.ll
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simplify-demanded-bits-pointer.ll
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simplify-demanded-fpclass-aggregates.ll
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simplify-demanded-fpclass-canonicalize.ll
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simplify-demanded-fpclass-exp.ll
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simplify-demanded-fpclass-extractelement.ll
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simplify-demanded-fpclass-fadd.ll
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simplify-demanded-fpclass-fdiv.ll
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simplify-demanded-fpclass-fma.ll
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simplify-demanded-fpclass-fmul.ll
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simplify-demanded-fpclass-fpext.ll
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simplify-demanded-fpclass-fptrunc-round.ll
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simplify-demanded-fpclass-fptrunc.ll
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simplify-demanded-fpclass-frexp.ll
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simplify-demanded-fpclass-fsub.ll
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simplify-demanded-fpclass-insertelement.ll
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simplify-demanded-fpclass-ldexp.ll
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simplify-demanded-fpclass-log.ll
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simplify-demanded-fpclass-maximum.ll
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simplify-demanded-fpclass-maximumnum.ll
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simplify-demanded-fpclass-maxnum.ll
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simplify-demanded-fpclass-minimum.ll
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simplify-demanded-fpclass-minimumnum.ll
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simplify-demanded-fpclass-minnum.ll
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simplify-demanded-fpclass-phi.ll
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simplify-demanded-fpclass-rounding-intrinsics.ll
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simplify-demanded-fpclass-shufflevector.ll
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simplify-demanded-fpclass-sqrt.ll
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simplify-demanded-fpclass.ll
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simplify-intrinsics.ll
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simplify-libcalls-erased.ll
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simplify-libcalls-i16.ll
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simplify-libcalls-inreg.ll
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simplify-libcalls-new.ll
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simplify-libcalls.ll
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sincospi.ll
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sink_instruction.ll
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sink_sideeffecting_instruction.ll
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sink_to_unreachable.ll
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sink-alloca.ll
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sink-dereferenceable-assume.ll
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sink-instruction-introduces-unnecessary-poison-value.ll
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sink-into-catchswitch.ll
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sink-into-ncd.ll
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sink-into-resume-block.ll
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sink-not-into-and.ll
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sink-not-into-another-hand-of-and.ll
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sink-not-into-another-hand-of-logical-and.ll
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sink-not-into-another-hand-of-logical-or.ll
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sink-not-into-another-hand-of-or.ll
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sink-not-into-logical-and.ll
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sink-not-into-logical-or.ll
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sink-not-into-or.ll
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sitofp.ll
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skip-opt-void-to-non-void-conversion.ll
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smax-icmp.ll
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smin-icmp.ll
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smulo.ll
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snprintf-2.ll
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snprintf-3.ll
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snprintf-4.ll
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snprintf.ll
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sprintf-1.ll
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sprintf-2.ll
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sprintf-3.ll
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sprintf-void.ll
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sqrt-nofast.ll
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sqrt.ll
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srem1.ll
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srem-canonicalize.ll
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srem-simplify-bug.ll
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srem-via-sdiv-mul-sub.ll
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ssub-with-overflow.ll
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ssubo.ll
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stack-overalign.ll
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stacksave-debuginfo.ll
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stacksaverestore.ll
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statepoint-cleanup.ll
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statepoint-iter.ll
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statepoint.ll
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stdio-custom-dl.ll
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stdiocall-bad-sig.ll
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store-load-unaliased-gep.ll
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store.ll
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storemerge-dbg.ll
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StoreToNull-DbgCheck.ll
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stpcpy_chk-1.ll
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stpcpy_chk-2.ll
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stpcpy-1.ll
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stpcpy-2.ll
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stpncpy-1.ll
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str-int-2.ll
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str-int-3.ll
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str-int-4.ll
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str-int-5.ll
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str-int.ll
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strcall-bad-sig.ll
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strcall-no-nul.ll
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strcat-1.ll
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strcat-2.ll
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strcat-3.ll
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strchr-1.ll
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strchr-2.ll
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strchr-3.ll
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strchr-4.ll
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strcmp-1.ll
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strcmp-2.ll
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strcmp-3.ll
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strcmp-4.ll
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strcmp-memcmp.ll
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strcpy_chk-1.ll
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strcpy_chk-2.ll
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strcpy_chk-64.ll
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strcpy-1.ll
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strcpy-2.ll
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strcpy-nonzero-as.ll
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strcspn-1.ll
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strcspn-2.ll
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strict-sub-underflow-check-to-comparison-of-sub-operands.ll
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strlcpy-1.ll
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strlen_chk.ll
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strlen-1.ll
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strlen-2.ll
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strlen-3.ll
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strlen-4.ll
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strlen-5.ll
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strlen-6.ll
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strlen-7.ll
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strlen-8.ll
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strlen-9.ll
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strncat-1.ll
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strncat-2.ll
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strncat-3.ll
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strncmp-1.ll
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strncmp-2.ll
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strncmp-3.ll
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strncmp-4.ll
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strncmp-5.ll
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strncmp-6.ll
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strncmp-wrong-datalayout.ll
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strncpy_chk-1.ll
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strncpy_chk-2.ll
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strncpy-1.ll
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strncpy-2.ll
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strncpy-3.ll
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strncpy-4.ll
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strndup.ll
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strnlen-1.ll
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strnlen-2.ll
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strnlen-3.ll
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strnlen-4.ll
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strnlen-5.ll
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strnlen-6.ll
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strpbrk-1.ll
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strpbrk-2.ll
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strrchr-1.ll
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strrchr-2.ll
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strrchr-3.ll
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strspn-1.ll
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strstr-1.ll
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strstr-2.ll
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strto-1.ll
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struct-assign-tbaa-2.ll
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struct-assign-tbaa-new.ll
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struct-assign-tbaa.ll
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sub-after-sle-is-non-negative.ll
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sub-and-or-neg-xor.ll
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sub-ashr-and-to-icmp-select.ll
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sub-ashr-or-to-icmp-select.ll
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sub-from-sub.ll
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sub-gep.ll
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sub-lshr-or-to-icmp-select.ll
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sub-minmax.ll
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sub-not.ll
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sub-of-negatible-inseltpoison.ll
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sub-of-negatible.ll
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sub-or-and-xor.ll
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sub-sext-add.ll
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sub-xor-cmp.ll
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sub-xor-or-neg-and.ll
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sub-xor.ll
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sub.ll
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subtract-from-one-hand-of-select.ll
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subtract-of-one-hand-of-select.ll
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swifterror-argument-bitcast-fold.ll
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switch-constant-expr.ll
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switch-select.ll
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switch-shl.ll
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switch-sub.ll
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switch-truncate-crash.ll
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switch-xor.ll
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switch-zext-sext.ll
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tbaa-store-to-load.ll
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threadlocal_address.ll
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tmp-alloca-bypass.ll
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toascii-1.ll
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token.ll
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trig.ll
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trivial-dse-calls.ll
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trunc-binop-ext.ll
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trunc-demand.ll
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trunc-extractelement-inseltpoison.ll
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trunc-extractelement.ll
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trunc-fp-to-int.ll
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trunc-inseltpoison.ll
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trunc-load.ll
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trunc-lshr.ll
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trunc-sext.ll
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trunc-shift-trunc.ll
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trunc-shl-zext.ll
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trunc.ll
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truncating-saturate.ll
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type_pun-inseltpoison.ll
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type_pun.ll
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uadd-with-overflow.ll
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uaddo2.ll
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uaddo.ll
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ucmp.ll
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udiv_select_to_select_shift.ll
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udiv-pow2-vscale-inseltpoison.ll
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udiv-pow2-vscale.ll
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udiv-simplify.ll
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udivrem-change-width.ll
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umax-icmp.ll
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umin_cttz_ctlz.ll
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umin-icmp.ll
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umul-sign-check.ll
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umulo-square.ll
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umulo.ll
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unavailable-debug.ll
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unfold-masked-merge-with-const-mask-scalar.ll
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unfold-masked-merge-with-const-mask-vector.ll
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unordered-compare-and-ordered.ll
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unordered-fcmp-select.ll
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unpack-fca.ll
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unreachable-alloca-lifetime-markers.ll
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unreachable-code.ll
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unreachable-dbg-info-modified.ll
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unrecognized_three-way-comparison.ll
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unsigned_saturated_sub.ll
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unsigned-add-lack-of-overflow-check-via-add.ll
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unsigned-add-lack-of-overflow-check-via-xor.ll
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unsigned-add-lack-of-overflow-check.ll
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unsigned-add-overflow-check-via-add.ll
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unsigned-add-overflow-check-via-xor.ll
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unsigned-add-overflow-check.ll
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unsigned-mul-lack-of-overflow-check-via-mul-udiv.ll
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unsigned-mul-lack-of-overflow-check-via-udiv-of-allones.ll
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unsigned-mul-overflow-check-via-mul-udiv.ll
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unsigned-mul-overflow-check-via-udiv-of-allones.ll
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unsigned-sub-lack-of-overflow-check.ll
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unsigned-sub-overflow-check.ll
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unused-nonnull.ll
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unwind-inline-asm.ll
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update-bpi.ll
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urem-simplify-bug.ll
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urem-via-cmp-select.ll
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urem-via-udiv-mul-sub.ll
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usub_sat_to_msb_mask.ll
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usub-overflow-known-by-implied-cond.ll
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usubo.ll
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vararg.ll
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variable-signext-of-variable-high-bit-extraction.ll
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vec_demanded_elts-inseltpoison.ll
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vec_demanded_elts.ll
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vec_extract_2elts.ll
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vec_extract_through_broadcast.ll
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vec_extract_var_elt.ll
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vec_gep_scalar_arg-inseltpoison.ll
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vec_gep_scalar_arg.ll
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vec_phi_extract-inseltpoison.ll
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vec_phi_extract.ll
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vec_sext.ll
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vec_shuffle-inseltpoison.ll
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vec_shuffle-phi-multiuse.ll
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vec_shuffle.ll
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vec_udiv_to_shift.ll
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vec-binop-select-inseltpoison.ll
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vec-binop-select.ll
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vector_gep1-inseltpoison.ll
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vector_gep1.ll
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vector_gep2.ll
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vector_insertelt_shuffle-inseltpoison.ll
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vector_insertelt_shuffle.ll
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vector-casts-inseltpoison.ll
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vector-casts.ll
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vector-concat-binop-inseltpoison.ll
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vector-concat-binop.ll
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vector-logical-reductions.ll
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vector-mul.ll
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vector-reduce-add-known-bits.ll
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vector-reduce-min-max-known.ll
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vector-reductions.ll
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vector-reverse.ll
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vector-splice.ll
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vector-trunc.ll
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vector-type.ll
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vector-udiv.ll
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vector-urem.ll
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vector-xor.ll
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vectorgep-crash.ll
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volatile_load_cast.ll
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volatile_store.ll
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vp-reverse.ll
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vscale_alloca.ll
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vscale_cmp.ll
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vscale_extractelement-inseltpoison.ll
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vscale_extractelement.ll
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vscale_gep.ll
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vscale_insertelement-inseltpoison.ll
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vscale_insertelement.ll
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vscale_load.ll
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vscale_sext_and_zext.ll
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vscale_trunc.ll
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vscale_zero.ll
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vscale.ll
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wcslen-1.ll
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wcslen-2.ll
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wcslen-3.ll
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wcslen-4.ll
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wcslen-5.ll
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wcslen-6.ll
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weak-symbols.ll
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widenable-conditions.ll
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win-fdim.ll
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win-math.ll
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with_overflow.ll
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xor2.ll
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xor-and-or.ll
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xor-ashr.ll
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xor-icmps.ll
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xor-of-icmps-with-extra-uses.ll
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xor-of-or.ll
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xor-undef.ll
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xor.ll
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zero-point-zero-add.ll
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zeroext-and-reduce.ll
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zext-bool-add-sub.ll
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zext-ctlz-trunc-to-ctlz-add.ll
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zext-fold.ll
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zext-or-icmp.ll
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zext-phi.ll
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zext.ll
…

README.txt 

This directory contains test cases for the instcombine transformation.  The
dated tests are actual bug tests, whereas the named tests are used to test
for features that the this pass should be capable of performing.