[AIE2P] Combine G_SHUFFLE_VECTOR into Unmerge+Concat #357
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katerynamuts
requested review from
abhinay-anubola,
abnikant,
andcarminati,
F-Stuckmann,
gbossu,
khallouh,
konstantinschwarz,
martien-de-jong,
niwinanto,
SagarMaheshwari99 and
stephenneuendorffer
as code owners
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| // Check whether we can extract the subvector | ||
| if (!checkExtractSubvectorPrerequisites(TII, DstSubvecType, Src1Ty)) | ||
| return false; | ||
| bool canExtractSubvector = |
| ; CHECK-NEXT: [[COPY1:%[0-9]+]]:_(<64 x s32>) = COPY $dm1 | ||
| ; CHECK-NEXT: [[SHUF:%[0-9]+]]:_(<64 x s32>) = G_SHUFFLE_VECTOR [[COPY]](<64 x s32>), [[COPY1]], shufflemask(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef, undef) | ||
| ; CHECK-NEXT: PseudoRET implicit $lr, implicit [[SHUF]](<64 x s32>) | ||
| ; CHECK-NEXT: [[UV:%[0-9]+]]:_(<32 x s32>), [[UV1:%[0-9]+]]:_(<32 x s32>) = G_UNMERGE_VALUES [[COPY]](<64 x s32>) |
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This is a special case that can be handled with a single copy. As we have an undef anyway, we can copy the full vector. This will reduce one extra vmov in the end.
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true! and it will be like this once the PR #346 is merged
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