| commit | ebcb4929004ae3f08b2ca3d5d246f29aa73600e1 | [log] [tgz] |
|---|---|---|
| author | Gaëtan Bossu <gaetan.bossu@arm.com> | Thu Jul 31 13:07:28 2025 +0000 |
| committer | Gaëtan Bossu <gaetan.bossu@arm.com> | Fri Aug 01 09:23:30 2025 +0000 |
| tree | 29324702b4575e221c0efb710a6bf580059188e4 | |
| parent | 73245b06b3da19ef70e04cf0f0a0d0df1ba82a57 [diff] |
[AArch64][ISel] Subvector extracts can use undef for second EXT input
This will later allow us to use the SVE2 constructive variant of EXT
without requiring a MOV. That is because that variant of EXT requires
two consecutive Z registers as input. As a consequence, extracting a
subvector from e.g. z2 into z0 would require:
z3 = MOV z2
z0 = EXT_ZZI_B { z2, z3 }, idx
With this change, the z3 part of the { z2, z3 } tuple will be marked as
undef, allowing the MOV to be simplified.
We just need to add patterns for EXT_ZZI_B now, currently only the the
destructive EXT_ZZI variant is selected.
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