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llvm-project/llvm/test/Transforms/LoopUnroll
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Philip Reames 8d85e945b2 [SCEV] Canonicalize X - urem X, Y patterns 
There are multiple possible ways to represent the X - urem X, Y pattern. SCEV was not canonicalizing, and thus, depending on which you analyzed, you could get different results. The sub representation appears to produce strictly inferior results in practice, so I decided to canonicalize to the Y * X/Y version.

The motivation here is that runtime unroll produces the sub X - (and X, Y-1) pattern when Y is a power of two. SCEV is thus unable to recognize that an unrolled loop exits because we don't figure out that the new unrolled step evenly divides the trip count of the unrolled loop. After instcombine runs, we convert the the andn form which SCEV recognizes, so essentially, this is just fixing a nasty pass ordering dependency.

The ARM loop hardware interaction in the test diff is opague to me, but the comments in the review from others knowledge of the infrastructure appear to indicate these are improvements in loop recognition, not regressions.

Differential Revision: https://reviews.llvm.org/D114018
 		2021-11-16 11:59:21 -08:00
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AArch64 [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
AMDGPU [AMDGPU][CostModel] Refine cost model for control-flow instructions. 2021-04-10 09:20:24 +03:00
ARM [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
Hexagon
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PowerPC [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
WebAssembly [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
X86 [BasicTTIImpl][LoopUnroll] getUnrollingPreferences(): emit ORE remark when advising against unrolling due to a call in a loop 2021-08-03 00:57:26 +03:00
2004-05-13-DontUnrollTooMuch.ll
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2005-03-06-BadLoopInfoUpdate.ll
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2006-08-24-MultiBlockLoop.ll
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2007-04-16-PhiUpdate.ll
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2007-05-05-UnrollMiscomp.ll
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2007-05-09-UnknownTripCount.ll
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2007-11-05-Crash.ll
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2011-08-08-PhiUpdate.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
2011-08-09-IVSimplify.ll
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2011-08-09-PhiUpdate.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
2011-10-01-NoopTrunc.ll
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2012-04-09-unroll-indirectbr.ll [NFCI][SimplifyCFG] Mark all the SimplifyCFG tests that already don't invalidate DomTree as such 2020-12-17 01:03:49 +03:00
FullUnroll.ll [test] Fix FullUnroll.ll 2020-09-17 15:56:13 -07:00
assume-timeout.ll [ValueTracking] add scan limit for assumes 2021-02-15 15:24:20 -05:00
basic.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
callbr.ll
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complete_unroll_profitability_with_assume.ll
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convergent.ll
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dce.ll Do actual DCE in LoopUnroll (try 4) 2021-05-19 10:25:31 -07:00
debug-info.ll
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disable-full-unroll-by-opt.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
disable-loop-unrolling_forced.ll
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disable_nonforced.ll
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disable_nonforced_count.ll
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disable_nonforced_enable.ll
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disable_nonforced_full.ll
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ephemeral.ll
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epilog_const_phi.ll
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followup.ll
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full-unroll-bad-cost.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
full-unroll-crashers.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
full-unroll-heuristics-2.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
full-unroll-heuristics-cmp.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
full-unroll-heuristics-dce.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
full-unroll-heuristics-geps.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
full-unroll-heuristics-phi-prop.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
full-unroll-heuristics.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
full-unroll-invariant.ll Do actual DCE in LoopUnroll (try 4) 2021-05-19 10:25:31 -07:00
full-unroll-keep-first-exit.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
full-unroll-one-unpredictable-exit.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
high-cost-trip-count-computation.ll
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ignore-annotation-intrinsic-cost.ll
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invalidate_right_loop.ll
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loop-remarks-with-hotness.ll [LoopUnroll] Simplify optimization remarks 2021-06-18 23:47:03 +02:00
loop-remarks.ll
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multiple-exits.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
noalias.ll [LoopUnroll] Use llvm.experimental.noalias.scope.decl for duplicating noalias metadata as needed 2021-01-24 13:48:20 +01:00
nonlatchcondbr.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
not-rotated.ll
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opt-levels.ll [NewPM] Run non-trivial loop unswitching under -O2/3/s/z 2021-01-12 11:04:40 -08:00
optsize-loop-size.ll Do actual DCE in LoopUnroll (try 4) 2021-05-19 10:25:31 -07:00
partial-unroll-const-bounds.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
partial-unroll-dead-instructions.ll
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partial-unroll-non-latch-exit.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
partially-unroll-unconditional-latch.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
peel-loop-and-unroll.ll [LoopUnroll] Separate peeling from unrolling 2021-06-05 10:32:00 +02:00
peel-loop-conditions-pgo-1.ll
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peel-loop-conditions-pgo-2.ll
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peel-loop-conditions.ll Loop peeling: check that latch is conditional branch 2021-01-20 11:01:16 -05:00
peel-loop-inner.ll [SimplifyCFG] performBranchToCommonDestFolding(): require block-closed SSA form for bonus instructions (PR51125) 2021-09-09 12:28:09 +03:00
peel-loop-irreducible.ll
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peel-loop-negative.ll
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peel-loop-nests.ll
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peel-loop-noalias-scope-decl.ll [LoopPeel] Use llvm.experimental.noalias.scope.decl for duplicating noalias metadata as needed. 2021-02-01 10:01:17 +01:00
peel-loop-not-forced.ll
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peel-loop-pgo-deopt-idom-2.ll [LoopPeel] Allow peeling with multiple unreachable-terminated exit blocks. 2021-08-25 13:26:40 +01:00
peel-loop-pgo-deopt-idom.ll [LoopPeel] Allow peeling with multiple unreachable-terminated exit blocks. 2021-08-25 13:26:40 +01:00
peel-loop-pgo-deopt.ll [LoopPeel] Allow peeling with multiple unreachable-terminated exit blocks. 2021-08-25 13:26:40 +01:00
peel-loop-pgo.ll Revert "Use uint64_t for branch weights instead of uint32_t" 2020-10-31 00:25:32 -07:00
peel-loop-scev-invalidate.ll
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peel-loop.ll [NewPM] Consistently use 'simplifycfg' rather than 'simplify-cfg' 2021-07-09 09:47:03 +02:00
peel-loop2.ll
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peel-multiple-unreachable-exits.ll [LoopPeel] Peel loops with exits followed by an unreachable or deopt block 2021-11-02 23:12:04 +07:00
peel-to-turn-invariant-accesses-dereferenceable.ll [LoopPeel] Peel if it turns invariant loads dereferenceable. 2021-10-12 11:42:28 +01:00
pr10813.ll
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pr11361.ll
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pr14167.ll Re-land "[PowerPC] Remove QPX/A2Q BGQ/BGP CNK support" 2020-07-28 14:00:11 +00:00
pr18861.ll
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pr27157.ll
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pr28132.ll
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pr31718.ll [LoopUnroll] Make some tests more robust (NFC) 2021-04-17 20:59:20 +02:00
pr33437.ll [LoopUnroll] Separate peeling from unrolling 2021-06-05 10:32:00 +02:00
pr45939-peel-count-and-complete-unroll.ll [LoopUnroll] Separate peeling from unrolling 2021-06-05 10:32:00 +02:00
rebuild_lcssa.ll [LoopUnroll] Regenerate test checks (NFC) 2021-05-24 17:26:07 +02:00
revert-D110922.ll [Test] Add commit justifying revert of D110922 2021-10-09 14:32:46 +07:00
revisit.ll [runtime] Move prolog/epilog block to a post-simplify strategy 2021-08-31 09:29:36 -07:00
runtime-epilog-debuginfo.ll Revert "[NFC] remove explicit default value for strboolattr attribute in tests" 2021-05-24 19:43:40 +02:00
runtime-li.ll [LoopUnroll] Make some tests more robust (NFC) 2021-04-17 20:59:20 +02:00
runtime-loop-at-most-two-exits.ll [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
runtime-loop-branchweight.ll Revert "Use uint64_t for branch weights instead of uint32_t" 2020-10-31 00:25:32 -07:00
runtime-loop-known-exit.ll [LoopUnroll] Use smallest exact trip count from any exit 2021-06-20 20:58:26 +02:00
runtime-loop-multiexit-dom-verify.ll [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
runtime-loop-multiple-exits.ll Fix a misleading FIXME in an unroll test 2021-11-15 12:20:10 -08:00
runtime-loop-non-exiting-latch.ll
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runtime-loop.ll [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
runtime-loop1.ll [runtime] Move prolog/epilog block to a post-simplify strategy 2021-08-31 09:29:36 -07:00
runtime-loop2.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
runtime-loop3.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
runtime-loop4.ll
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runtime-loop5.ll [SCEV] Canonicalize X - urem X, Y patterns 2021-11-16 11:59:21 -08:00
runtime-multiexit-heuristic.ll [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
runtime-small-upperbound.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
runtime-unroll-assume-no-remainder.ll [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
runtime-unroll-remainder.ll [runtime-unroll] Use incrementing IVs instead of decrementing ones 2021-11-12 15:44:58 -08:00
scevunroll.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
shifted-tripcount.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
tripcount-overflow.ll
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unloop.ll [LoopUnroll] Use smallest exact trip count from any exit 2021-06-20 20:58:26 +02:00
unroll-after-peel.ll [LoopUnroll] Fix a crash 2021-01-11 10:19:26 +07:00
unroll-cleanup.ll
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unroll-cleanuppad.ll
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unroll-cost-symbolic-execute.ll [unroll] Use value domain for symbolic execution based cost model 2021-05-26 08:41:25 -07:00
unroll-count.ll
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unroll-header-exiting-with-phis-multiple-exiting-blocks.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
unroll-header-exiting-with-phis.ll Do actual DCE in LoopUnroll (try 4) 2021-05-19 10:25:31 -07:00
unroll-heuristics-pgo.ll
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unroll-loop-invalidation.ll [NewPM] Hide pass manager debug logging behind -debug-pass-manager-verbose 2021-05-07 21:51:47 -07:00
unroll-maxcount.ll
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unroll-opt-attribute.ll [PGO][PGSO] Let unroll hints take precedence over PGSO. 2021-01-07 10:10:31 -08:00
unroll-pragmas-disabled.ll
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unroll-pragmas.ll
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unroll-preserve-scev-lcssa.ll
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unroll-unconditional-latch.ll [unroll] Keep unrolled iterations with initial iteration 2021-11-12 11:40:50 -08:00
update-loop-info-in-subloops.ll [NewPM][LoopUnroll] Rename unroll* to loop-unroll* 2020-06-26 09:28:32 -07:00
wrong_assert_in_peeling.ll [LoopUnroll] Separate peeling from unrolling 2021-06-05 10:32:00 +02:00