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llvm-project/llvm/test/Transforms/InstSimplify
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Nikita Popov 7ecad2e4ce [InstSimplify] Don't fold gep p, -p to null 
This is a partial fix for https://bugs.llvm.org/show_bug.cgi?id=44403.
Folding gep p, q-p to q is only legal if p and q have the same
provenance. This fold should probably be guarded by something like
getUnderlyingObject(p) == getUnderlyingObject(q).

This patch is a partial fix that removes the special handling for
gep p, 0-p, which will fold to a null pointer, which would certainly
not pass an underlying object check (unless p is also null, in which
case this would fold trivially anyway). Folding to a null pointer
is particularly problematic due to the special handling it receives
in many places, making end-to-end miscompiles more likely.

Differential Revision: https://reviews.llvm.org/D93820
 		2021-01-12 20:24:23 +01:00
..
ConstProp [ConstProp] Constant propagation for get.active.lane.mask instrinsics 2021-01-08 16:10:01 +00:00
2010-12-20-Boolean.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2011-01-14-Thread.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2011-02-01-Vector.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2011-09-05-InsertExtractValue.ll [InstSimplify] Return poison for out of bounds extractelement 2021-01-03 18:15:58 +01:00
2011-10-27-BinOpCrash.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2011-11-23-MaskedBitsCrash.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2013-04-19-ConstantFoldingCrash.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
AndOrXor.ll [InstSimplify] reduce logic with inverted add/sub ops 2020-12-21 08:51:43 -05:00
abs_intrinsic.ll [InstSimplify] Don't miscompile `X == 0 ? abs(X) : -abs(X) --> -abs(X)` xform 2020-12-18 21:18:13 +03:00
add-mask.ll [ValueTracking] Add computeKnownBits DemandedElts support to masked add instructions (PR36319) 2020-03-18 21:50:56 +00:00
add.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
addsub.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
and-icmps-same-ops.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
and-or-icmp-min-max.ll [InstSimplify] peek through 'not' operand in logic-of-icmps fold 2020-10-25 11:13:30 -04:00
and-or-icmp-nullptr.ll [InstSimplify] fold and/or of compares with equality to min/max constant 2020-04-23 09:16:10 -04:00
and-or-icmp-zero.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
and.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
assume-non-zero.ll [ValueTracking] isKnownNonZero() should take non-null-ness assumptions into consideration (PR43267) 2019-12-20 01:47:57 +03:00
assume_icmp.ll [InstSimplify] Fold icmp with dominating assume 2020-07-03 18:53:58 +02:00
bitcast-vector-fold.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
bitreverse-fold.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
bitreverse.ll [ValueTracking] Add computeKnownBits DemandedElts support to EXTRACTELEMENT/OR/BSWAP/BITREVERSE instructions (PR36319) 2020-03-18 18:49:58 +00:00
bswap.ll [ValueTracking] Add computeKnownBits DemandedElts support to EXTRACTELEMENT/OR/BSWAP/BITREVERSE instructions (PR36319) 2020-03-18 18:49:58 +00:00
call.ll [InstSimplify] Fold call null/undef to poison 2021-01-06 21:09:30 +01:00
cast-unsigned-icmp-cmp-0.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
cast.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
cmp-vec-fast-path.ll [SVE] Take constant fold fast path for splatted vscale vectors 2020-11-17 12:45:31 -08:00
cmp_ext.ll [InstSimplify] Simplify comparison between zext(x) and sext(x) 2020-07-04 11:03:00 +02:00
cmp_of_min_max.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
compare.ll [InstSimplify] allow vector folds for (Pow2C << X) == NonPow2C 2020-11-08 09:52:05 -05:00
constantfold-add-nuw-allones-to-allones.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
constantfold-shl-nuw-C-to-C.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
constfold-constrained.ll [FEnv] Constfold some unary constrained operations 2020-03-28 12:28:33 +07:00
dead-code-removal.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
distribute.ll [InstSimplify] add tests for expandCommutativeBinOp; NFC 2020-07-29 23:21:39 +09:00
div-by-0-guard-before-smul_ov-not.ll [InstSimplify] Drop leftover "division-by-zero guard" around `@llvm.umul.with.overflow` inverted overflow bit 2019-08-29 12:48:04 +00:00
div-by-0-guard-before-smul_ov.ll [InstSimplify] Drop leftover "division-by-zero guard" around `@llvm.umul.with.overflow` overflow bit 2019-08-29 12:47:50 +00:00
div-by-0-guard-before-umul_ov-not.ll [InstSimplify] Drop leftover "division-by-zero guard" around `@llvm.umul.with.overflow` inverted overflow bit 2019-08-29 12:48:04 +00:00
div-by-0-guard-before-umul_ov.ll [InstSimplify] Drop leftover "division-by-zero guard" around `@llvm.umul.with.overflow` overflow bit 2019-08-29 12:47:50 +00:00
div.ll [InstSimplify] Fold division by zero to poison 2021-01-03 20:52:45 +01:00
exact-nsw-nuw.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
extract-element.ll [InstSimplify] Return poison for out of bounds extractelement 2021-01-03 18:15:58 +01:00
fast-math.ll [ValueTracking] fix CannotBeNegativeZero() to disregard 'nsz' FMF 2020-05-05 16:04:59 -04:00
fcmp-select.ll [InstSimplify] use FMF to improve fcmp+select fold 2019-11-04 08:29:56 -05:00
fcmp.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
fdiv.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
floating-point-arithmetic.ll [InstSimplify] add/move tests for fmin/fmax; NFC 2020-09-14 10:24:19 -04:00
floating-point-compare.ll [ValueTracking] enhance isKnownNeverInfinity to understand sitofp 2020-09-27 08:40:31 -04:00
fminmax-folds.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
fold-intrinsics.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
fp-nan.ll [InstSimplify] Fold nnan/ninf violation to poison 2021-01-03 22:05:40 +01:00
fp-undef-poison.ll [InstSimplify] Fold nnan/ninf violation to poison 2021-01-03 22:05:40 +01:00
fptoi-sat.ll [ConstantFold] Fold fptoi.sat intrinsics 2021-01-10 17:37:27 +01:00
freeze-noundef.ll Add support for !noundef metatdata on loads 2020-10-17 13:50:10 +09:00
freeze.ll [ValueTracking] Instruction::isBinaryOp should be used for constexprs 2020-07-26 21:48:51 +09:00
gep.ll [InstSimplify] Don't fold gep p, -p to null 2021-01-12 20:24:23 +01:00
icmp-abs-nabs.ll [ValueTracking] When calculating known bits for integer abs, make sure we're looking at a negate and not just any instruction with the nsw flag set. 2019-08-07 18:28:16 +00:00
icmp-bool-constant.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
icmp-constant.ll [InstSimplify] avoid crashing by trying to rem-by-zero 2020-08-06 16:06:31 -04:00
icmp-ranges.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
icmp.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
implies.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
insertelement.ll [InstSimplify] Fold insertelement vec, poison, idx into vec 2021-01-07 10:10:14 +09:00
insertvalue.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
known-never-nan.ll [FPEnv] Intrinsic llvm.roundeven 2020-05-26 19:24:58 +07:00
known-non-zero.ll [ValueTracking] isKnownNonZero, computeKnownBits for freeze 2020-09-10 08:07:38 +09:00
load-relative-32.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
load-relative.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
load.ll [AssumeBundles] add cannonicalisation to the assume builder 2020-06-19 10:32:26 +02:00
log-exp-intrinsic.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
log2-pow2-intrinsic.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
log10-pow10-intrinsic.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
logic-of-fcmps.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
maxmin.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
maxmin_intrinsics.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
mul.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
negate.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
noalias-ptr.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
null-ptr-is-valid-attribute.ll ValueTracking: Fix isKnownNonZero for non-0 null pointers for byval 2020-07-16 13:50:49 -04:00
null-ptr-is-valid.ll ValueTracking: Fix isKnownNonZero for non-0 null pointers for byval 2020-07-16 13:50:49 -04:00
or-icmps-same-ops.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
or.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
past-the-end.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
phi-cse.ll [NFC][InstSimplify] Add a note to PHI CSE tests that they are all negative tests 2020-08-29 13:13:06 +03:00
phi.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
pr28725.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr33957.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ptr_diff.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
reassociate.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
redundant-null-check-in-uadd_with_overflow-of-nonnull-ptr.ll [InstSimplify] Pass SimplifyQuery into simplifyUnsignedRangeCheck() and use it for isKnownNonZero() 2019-09-11 15:32:46 +00:00
rem.ll [InstSimplify] Fold division by zero to poison 2021-01-03 20:52:45 +01:00
remove-dead-call.ll [NewPM] Pin tests with -debug-pass to legacy PM 2020-09-22 17:54:25 -07:00
require-dominator.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
result-of-add-of-negative-is-non-zero-and-no-underflow.ll [NFC][InstSimplify] Add some more tests for D67498/D67502 2019-09-13 17:58:24 +00:00
result-of-usub-by-nonzero-is-non-zero-and-no-overflow.ll [InstSimplify] simplifyUnsignedRangeCheck(): handle more cases (PR43251) 2019-09-12 09:26:17 +00:00
result-of-usub-is-non-zero-and-no-overflow.ll [InstSimplify] Handle more 'A </>/>=/<= B &&/|| (A - B) !=/== 0' patterns (PR43251) 2019-09-25 22:59:41 +00:00
returned.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
round-intrinsics.ll [FPEnv] Intrinsic llvm.roundeven 2020-05-26 19:24:58 +07:00
saturating-add-sub.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
sdiv.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
select-and-cmp.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
select-implied.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
select-inseltpoison.ll Precommit transform tests that have poison as insertelement's placeholder 2020-12-24 11:46:17 +09:00
select-or-cmp.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
select.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
shift-128-kb.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
shift-knownbits.ll [InstSimplify] Fold out-of-bounds shift to poison 2021-01-06 20:41:37 +01:00
shift.ll [InstSimplify] Fold out-of-bounds shift to poison 2021-01-06 20:41:37 +01:00
shr-nop.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
shr-scalar-vector-consistency.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
shufflevector-inseltpoison.ll Precommit tests that have poison as shufflevector's placeholder 2020-12-29 17:09:31 +09:00
shufflevector.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
signed-div-rem.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
simplify-nested-bitcast.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
srem.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
sub.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00
undef.ll [InstSimplify] Fold call null/undef to poison 2021-01-06 21:09:30 +01:00
vec-cmp.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
vector_gep.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
vector_ptr_bitcast.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
vscale-inseltpoison.ll [InstSimplify] Return poison for out of bounds extractelement 2021-01-03 18:15:58 +01:00
vscale.ll [InstSimplify] Return poison for out of bounds extractelement 2021-01-03 18:15:58 +01:00
xor.ll [InstSimplify] Add tests that fold instructions with poison operands (NFC) 2020-12-02 01:01:59 +09:00