tree e92c1ca35495235a12af03babf0ecac389c3cf2b
parent af03d6b5186235620316640b58006b51301d316d
author Ricardo Jesus <rjj@nvidia.com> 1747043838 +0100
committer GitHub <noreply@github.com> 1747043838 +0100
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[AArch64][SVE] Add patterns for bit-select instructions. (#138689)

This patch adds patterns to select SVE2 bit-sel instructions such as BSL
from (or (and a, c), (and b, (vnot c)))) and other similar patterns. For
example:
```cpp
svuint64_t bsl(svuint64_t a, svuint64_t b, svuint64_t c) {
  return (a & c) | (b & ~c);
}
```
Currently:
```gas
bsl:
  and     z0.d, z2.d, z0.d
  bic     z1.d, z1.d, z2.d
  orr     z0.d, z0.d, z1.d
  ret
```
Becomes:
```gas
bsl:
  bsl     z0.d, z0.d, z1.d, z2.d
  ret
```