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llvm-project/llvm/test/Transforms/LoopStrengthReduce
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Nikita Popov 835104a114 [LSR] Drop potentially invalid nowrap flags when switching to post-inc IV (PR46943) 
When LSR converts a branch on the pre-inc IV into a branch on the
post-inc IV, the nowrap flags on the addition may no longer be valid.
Previously, a poison result of the addition might have been ignored,
in which case the program was well defined. After branching on the
post-inc IV, we might be branching on poison, which is undefined behavior.

Fix this by discarding nowrap flags which are not present on the SCEV
expression. Nowrap flags on the SCEV expression are proven by SCEV
to always hold, independently of how the expression will be used.
This is essentially the same fix we applied to IndVars LFTR, which
also performs this kind of pre-inc to post-inc conversion.

I believe a similar problem can also exist for getelementptr inbounds,
but I was not able to come up with a problematic test case. The
inbounds case would have to be addressed in a differently anyway
(as SCEV does not track this property).

Fixes https://bugs.llvm.org/show_bug.cgi?id=46943.

Differential Revision: https://reviews.llvm.org/D95286
 		2021-01-25 23:13:48 +01:00
..
AArch64 Mark FMOV constant materialization as being as cheap as a move. 2020-09-10 16:38:59 +00:00
AMDGPU Precommit tests that have poison as shufflevector's placeholder 2020-12-29 17:09:31 +09:00
ARM Precommit tests that have poison as shufflevector's placeholder 2020-12-29 17:09:31 +09:00
NVPTX Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
Power [PowerPC] implement target hook getTgtMemIntrinsic 2020-10-07 00:02:44 -04:00
X86 [LSR] Drop potentially invalid nowrap flags when switching to post-inc IV (PR46943) 2021-01-25 23:13:48 +01:00
2005-08-15-AddRecIV.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2005-08-17-OutOfLoopVariant.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2005-09-12-UsesOutOutsideOfLoop.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2007-04-23-UseIterator.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2008-08-13-CmpStride.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2008-09-09-Overflow.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2009-01-13-nonconstant-stride-outside-loop.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2009-04-28-no-reduce-mul.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2011-07-19-CritEdgeBreakCrash.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2011-10-03-CritEdgeMerge.ll [NFC][LSR] Autogenerate check lines in tests being affected by upcoming patch 2020-10-15 23:15:04 +03:00
2011-10-06-ReusePhi.ll [SCEV] Use NoWrapFlags when expanding a simple mul 2019-06-17 10:05:18 +00:00
2011-10-13-SCEVChain.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2011-10-14-IntPtr.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2011-12-19-PostincQuadratic.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2012-01-02-nopreheader.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2012-01-16-nopreheader.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2012-03-15-nopreheader.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2012-03-26-constexpr.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2012-07-13-ExpandUDiv.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2012-07-18-LimitReassociate.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2013-01-05-IndBr.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
2013-01-14-ReuseCast.ll [SCEV] Add explicit representations of umin/smin 2019-05-07 15:28:47 +00:00
addrec-gep-address-space.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
addrec-gep.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
address-space-loop.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
callbr-critical-edge-splitting.ll BreakCriticalEdges: do not split the critical edge from a CallBr indirect successor 2021-01-15 13:51:47 -08:00
callbr-critical-edge-splitting2.ll BreakCriticalEdges: do not split the critical edge from a CallBr indirect successor 2021-01-15 13:51:47 -08:00
count-to-zero.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
dbg-preserve-0.ll Reland [DebugInfo] Improve dbg preservation in LSR. 2020-12-14 16:15:18 +01:00
dbg-preserve-1.ll [DebugInfo] Avoid LSR crash on large integer inputs 2021-01-05 10:25:37 +00:00
dead-phi.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
different-type-ivs.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
dominate-assert.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
dont-hoist-simple-loop-constants.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
dont_insert_redundant_ops.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
dont_reduce_bytes.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
dont_reverse.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ephemeral.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
exit_compare_live_range.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
funclet.ll Revert D71539 "Recommit "[SCEV] Look through single value PHIs."" 2020-09-21 17:21:43 -07:00
gnarly-setupcost.ll [LSR] Limit the recursion for setup cost 2019-04-23 08:52:21 +00:00
hoist-parent-preheader.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
illegal-addr-modes.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
invariant_value_first.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
invariant_value_first_arg.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ivchain.ll [NewPM][LSR] Rename strength-reduce -> loop-reduce 2020-07-02 11:15:29 -07:00
lsr-comp-time.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
lsr-overflow.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
missing-phi-operand-update.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
negative-scale.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
nested-reduce.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
nonintegral.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
nonlinear-postinc.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
ops_after_indvar.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
phi_node_update_multiple_preds.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
post-inc-icmpzero.ll Revert "Return "[SCEV] Use isBasicBlockEntryGuardedByCond in isLoopBackedgeGuardedByCond", 2nd try" 2020-11-26 18:12:51 +07:00
post-inc-optsize.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr2537.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr2570.ll [NFC][LSR] Avoid undefined grep in pr2570.ll 2019-06-19 16:02:54 +00:00
pr3086.ll [test] Fix tests using -analyze that fail under NPM 2020-10-21 21:54:30 -07:00
pr3399.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr3571.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr12018.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr12048.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr12691.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr18165.ll Migrate function attribute "no-frame-pointer-elim" to "frame-pointer"="all" as cleanups after D56351 2019-12-24 15:57:33 -08:00
pr25541.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
pr27056.ll [SCEVExpander] Avoid re-using existing casts if it means updating users. 2020-08-09 13:25:17 +01:00
pr31627.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
preserve-gep-loop-variant.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
related_indvars.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
remove_indvar.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
scaling_factor_cost_crash.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
scev-after-loopinstsimplify.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
scev-expander-lcssa.ll [SCEV] Add additional tests. 2020-07-28 16:15:57 +01:00
scev-insertpt-bug.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
sext-ind-var.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
share_code_in_preheader.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
share_ivs.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
shl.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
two-combinations-bug.ll Migrate function attribute "no-frame-pointer-elim"="false" to "frame-pointer"="none" as cleanups after D56351 2019-12-24 16:27:51 -08:00
uglygep-address-space.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
uglygep.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
use_postinc_value_outside_loop.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
var_stride_used_by_compare.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00
variable_stride.ll Revert "Temporarily Revert "Add basic loop fusion pass."" 2019-04-17 04:52:47 +00:00