Anton Afanasyev cfb6dfcbd1 [AggressiveInstCombine] Add logical shift right instr to TruncInstCombine DAG ...

Add `lshr` instruction to the DAG post-dominated by `trunc`, allowing
TruncInstCombine to reduce bitwidth of expressions containing
these instructions.

We should be shifting by less than the target bitwidth.
Also it is sufficient to require that all truncated bits
of the value-to-be-shifted are zeros: https://alive2.llvm.org/ce/z/_LytbB

Alive2 variable-length proof:
https://godbolt.org/z/1srE1aqzf => s/32/8/ => https://alive2.llvm.org/ce/z/StwPia

Part of https://reviews.llvm.org/D107766

Differential Revision: https://reviews.llvm.org/D108201

2021-08-18 22:20:58 +03:00

..

addsub-inseltpoison.ll

[NewPM][opt] Run the "default" AA pipeline by default

2021-01-21 21:08:54 -08:00

addsub.ll

[NewPM][opt] Run the "default" AA pipeline by default

2021-01-21 21:08:54 -08:00

ctlz-loop.ll

Reapply [InstCombine] Fold multiuse shr eq zero

2021-05-22 14:46:50 +02:00

earlycse-after-simplifycfg-two-entry-phi-node-folding.ll

[SimplifyCFG] Rerun PHI deduplication after common code sinkinkg (PR51092)

2021-07-15 16:34:34 +03:00

horiz-math-inseltpoison.ll

[InstCombine] use poison as placeholder for undemanded elems

2020-12-28 08:58:15 +09:00

horiz-math.ll

[InstCombine] use poison as placeholder for undemanded elems

2020-12-28 08:58:15 +09:00

lit.local.cfg

…

loop-idiom-vs-indvars.ll

[NewPM][opt] Run the "default" AA pipeline by default

2021-01-21 21:08:54 -08:00

masked-memory-ops.ll

[NewPM][opt] Run the "default" AA pipeline by default

2021-01-21 21:08:54 -08:00

nancvt.ll

…

peel-before-lv-to-enable-vectorization.ll

[PhaseOrdering] Update tests after 23c2f2e6b2.

2021-06-07 10:59:30 +01:00

pixel-splat.ll

[PhaseOrdering] Update tests after 23c2f2e6b2.

2021-06-07 10:59:30 +01:00

pr48844-br-to-switch-vectorization.ll

[PhaseOrdering] Add tests for PR44461 and PR48844 (NFC)

2021-01-23 21:24:54 +01:00

pr50555.ll

[AggressiveInstCombine] Add logical shift right instr to TruncInstCombine DAG

2021-08-18 22:20:58 +03:00

scalarization-inseltpoison.ll

[IR] Let IRBuilder's CreateVectorSplat/CreateShuffleVector use poison as placeholder

2020-12-30 04:21:04 +09:00

scalarization.ll

Update InstCombine to use undef matcher instead

2021-04-18 11:05:36 +09:00

shuffle-inseltpoison.ll

[IR] Let IRBuilder's CreateVectorSplat/CreateShuffleVector use poison as placeholder

2020-12-30 04:21:04 +09:00

shuffle.ll

[IR] Let IRBuilder's CreateVectorSplat/CreateShuffleVector use poison as placeholder

2020-12-30 04:21:04 +09:00

simplifycfg-late.ll

[SimplifyCFG] SwitchToLookupTable(): don't increase ret count

2021-07-26 23:29:55 +03:00

spurious-peeling.ll

[PassManager] Run additional LICM before LoopRotate

2021-04-02 11:11:42 +03:00

SROA-after-loop-unrolling.ll

[NewPM][opt] Run the "default" AA pipeline by default

2021-01-21 21:08:54 -08:00

vdiv-nounroll.ll

[PhaseOrdering] Update tests after 23c2f2e6b2.

2021-06-07 10:59:30 +01:00

vdiv.ll

[PhaseOrdering] Update tests after 23c2f2e6b2.

2021-06-07 10:59:30 +01:00

vector-reductions-expanded.ll

[InstCombine] fold reassociative FP add into start value of fadd reduction

2021-07-18 06:26:20 -04:00

vector-reductions-logical.ll

[InstCombine] canonicalize cmp-of-bitcast-of-vector-cmp to use zero constant

2021-07-31 13:31:12 -04:00

vector-reductions.ll

[SimplifyCFG] SimplifyCondBranchToTwoReturns(): really only deal with different ret blocks

2021-07-23 00:36:59 +03:00