Antonio Frighetto d27cbc5fa9

[DSE] Introduce eliminateRedundantStoresViaDominatingConditions (#181709) ...

While optimizing tautological assignments, if there exists a dominating
condition that implies the value being stored in a pointer, and such a
condition appears in a node that dominates the store via equality edge,
then subsequent stores may be redundant, if no write occurs in between.
This is achieved via a DFS top-down walk of the dom-tree, collecting
dominating conditions and propagating them to each subtree, popping them
upon backtracking.

This also generalizes `dominatingConditionImpliesValue` transform, which
was previously taking into account only the immediate dominator.

Compile-time:
https://llvm-compile-time-tracker.com/compare.php?from=f8906704104e446a7482aeca32d058b91867e05c&to=24c5d61f1e28acbe6a59ea4e9a5da0ffcee3bf1a&stat=instructions:u.

Compile-time w/ limit on recursion:
https://llvm-compile-time-tracker.com/compare.php?from=24c5d61f1e28acbe6a59ea4e9a5da0ffcee3bf1a&to=9889567fe8a0515ab895b22003c93fabfd9ac4e5&stat=instructions:u.
Seems to alleviate the small regression in stage2-O3, but seemingly adds
one in stage2-O0-g.

2026-04-04 10:55:25 +00:00

..

X86

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2011-03-25-DSEMiscompile.ll

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2011-09-06-EndOfFunction.ll

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2011-09-06-MemCpy.ll

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2016-07-17-UseAfterFree.ll

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assume.ll

[DSE] Only consider provenance captures (#138286)

2025-05-05 09:22:15 +02:00

atomic-overlapping.ll

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atomic-todo.ll

Revert "[AA] Improve precision for monotonic atomic load/store operations" (#173135)

2026-01-07 14:06:50 +01:00

atomic.ll

Revert "[AA] Improve precision for monotonic atomic load/store operations" (#173135)

2026-01-07 14:06:50 +01:00

batchaa-caching-new-pointers.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

calloc-store.ll

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captures-before-call.ll

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captures-before-load.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

captures.ll

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combined-partial-overwrites.ll

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const-pointers.ll

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crash.ll

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cs-cs-aliasing.ll

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dead-stores-via-dom-conditions.ll

[DSE] Introduce eliminateRedundantStoresViaDominatingConditions (#181709)

2026-04-04 10:55:25 +00:00

dead-vp.store.ll

[DSE] Add predicated vector length store support for masked store elimination (#134175)

2025-04-09 18:12:15 -07:00

debug-counter.ll

[Support] Support debug counters in non-assertion builds (#170468)

2025-12-03 16:21:47 +01:00

debuginfo.ll

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dependent-capture.ll

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dominate.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

fence-todo.ll

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fence.ll

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free.ll

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inst-limits.ll

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int_sideeffect.ll

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inter-procedural.ll

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invariant.start.ll

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launder.invariant.group.ll

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libcalls-chk.ll

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libcalls-darwin.ll

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libcalls.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

lifetime.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

loop-invariant-entry-block.ll

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malloc-earliest-escape-info-invalidation.ll

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malloc-to-calloc-with-nonzero-default-as.ll

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masked-dead-store-inseltpoison.ll

[IR] Replace alignment argument with attribute on masked intrinsics (#163802)

2025-10-20 08:50:09 +00:00

masked-dead-store.ll

[IR] Replace alignment argument with attribute on masked intrinsics (#163802)

2025-10-20 08:50:09 +00:00

matrix-intrinsics.ll

[MemoryLocation] Support strided matrix loads / stores (#163368)

2025-10-22 20:41:39 +01:00

mda-with-dbg-values.ll

[test][Transforms] Remove unsafe-fp-math uses part 2 (NFC) (#164786)

2025-10-23 20:31:31 +08:00

memcpy-complete-overwrite.ll

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memcpy-lifetimes.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

memintrinsics.ll

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memory-intrinsics-sizes.ll

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memoryssa-scan-limit.ll

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memset-and-memcpy.ll

[DSE/GVN] Continue to improve memset.pattern testing [nfc]

2025-05-05 09:25:23 -07:00

memset-missing-debugloc.ll

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memset-unknown-sizes.ll

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merge-stores-big-endian.ll

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merge-stores.ll

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multiblock-captures.ll

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multiblock-exceptions.ll

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multiblock-loop-carried-dependence.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

multiblock-loops.ll

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multiblock-malloc-free.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

multiblock-memintrinsics.ll

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multiblock-memoryphis.ll

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multiblock-multipath-throwing.ll

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multiblock-multipath.ll

[IR] Only allow lifetime.start/end on allocas (#149310)

2025-07-21 15:04:50 +02:00

multiblock-overlap.ll

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multiblock-partial.ll

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multiblock-simple.ll

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multiblock-throwing.ll

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multiblock-unreachable.ll

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no-targetdata.ll

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noop-stores.ll

[DSE] Handle provenance when eliminating tautological assignments

2026-03-04 10:35:52 +01:00

nounwind-invoke.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

offsetted-overlapping-stores.ll

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opaque-ptr.ll

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operand-bundles.ll

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out-of-bounds-stores.ll

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overlap.ll

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OverwriteStoreBegin.ll

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OverwriteStoreEnd.ll

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PartialStore2.ll

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PartialStore.ll

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phi-translation.ll

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pr11390.ll

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pr47285-not-overwritten-on-all-exit-paths.ll

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read-clobber-after-overwrite.ll

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scoped-noalias.ll

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simple-preservation.ll

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simple.ll

[DSE] Handle variable offsets with sized dead_on_return (#180364)

2026-02-07 11:43:56 -08:00

stats.ll

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store-after-loop.ll

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stores-of-existing-values.ll

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tail-byval.ll

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trivial-dse-calls.ll

[IR] Remove size argument from lifetime intrinsics (#150248)

2025-08-08 11:09:34 +02:00

wrong-malloc-size.ll

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zeroed-missing.ll

[DSE] Remove uninitialized from allockind when creating dummy zeroed variant function (#149336)

2025-07-18 09:30:23 +02:00