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7c9c296915
The sign_extend we insert here can get turned into a zero_extend if the sign bit is known zero. This can enable a setcc combine that shrinks compares with zero_extend. This reduces the use count of the zero_extend allowing other combines to turn it back into an any_extend. This restricts the combine to only cases where the result is used by a CopyToReg. This works for my original motivating case. I hope the CopyToReg use will prevent any converted extends from turning back into an any_extend. Reviewed By: luismarques Differential Revision: https://reviews.llvm.org/D106754 (cherry picked from commit 54588bcc052e5b08f90e672c33d0c1ad4eda2424) |
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