tree a35422e6ae1fa6d1290f157368dd8c9f6977bf1e
parent d7979c111ef80f77d1e04b1f49538f8946fe8f5f
author Simon Pilgrim <llvm-dev@redking.me.uk> 1730817735 +0000
committer GitHub <noreply@github.com> 1730817735 +0000
gpgsig -----BEGIN PGP SIGNATURE-----
 
 wsFcBAABCAAQBQJnKi7HCRC1aQ7uu5UhlAAA8esQAHfYlDZiO/xID+FwUJ2Gi0UG
 T9VdA2TiBT3XeGQyY99E3PK7+v8cNdKg1bJqwiRSnYpt/eQ7tz3na+i4I+6pCHTm
 Zrn7ObARpdYNw+sGI0Jdf+UG7Rp32ZW9T+KiPaJtb7v6mY7fmx96rJKBHwUvaJxj
 j2rVFQ8pLXzorstUTb1jDbv3EsZT95uzTXxyeTGeUD5ZUJf6MHuvo9ATXQtUciqN
 /mrplvSvI4mcKm3tXFZ3UJqVHBJl4F9XhT/UwjbTVgsjWVLDRJkF5ffHTcciVoOp
 n9PXJnR3Taza//2X/nM6DPIe3C4BD73rahfLGnRaxMNDkMqAN+hZrvUhbttztAeU
 dtpVtwCF3iK0AACka3AP4DNtNDcurhkFUT3imgJuO7ImOtQSX/3Pv3zWsixMJaKg
 aKUzgfRCE6UiwJKOaCofCwR2OX8W5QjdF97Kyp9VFNlFChdpOEMpdbfKe1Ln7ccO
 7lZlrBNnfxmYQpn8GzMetc4FJW1R5SSCYTjFPliaACen3952CPKKS5+ihtXUVaCq
 NTEoOTH7lAdzuu3bPfQcsZQAz3MvvCQ+iXRg7QaSs8b7j0dbi7+QLvy+RDuH9Mp0
 8GFVeE2PHga5srS78G9mQ/3KCwrH23aRGqOQ2Bs7qZ/Kkvqj8IgAMVjObrQdNvpz
 uiIAt7Wv3O2UWz3V34bQ
 =uNn9
 -----END PGP SIGNATURE-----
 

[DAG] visitAND - Fold (and (srl X, C), 1) -> (srl X, BW-1) for signbit extraction (#114992)

If we're masking the LSB of a SRL node result and that is shifting down an extended sign bit, see if we can change the SRL to shift down the MSB directly.

These patterns can occur during legalisation when we've sign extended to a wider type but the SRL is still shifting from the subreg.

Alternative to #114967

Fixes the remaining regression in #112588