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[RISCV] Add isel patterns for fshl with immediate to select FSRI/FSRIW

Authored by craig.topper on Nov 4 2020, 11:25 PM.



There is no FSLI instruction, but we can emulate it using FSRI by swapping operands and subtracting the immediate from the bitwidth.

Hopefully I've accounted for the operand order correctly here.

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craig.topper created this revision.Nov 4 2020, 11:25 PM
Herald added a project: Restricted Project. · View Herald TranscriptNov 4 2020, 11:25 PM
craig.topper requested review of this revision.Nov 4 2020, 11:25 PM
This revision is now accepted and ready to land.Nov 5 2020, 12:27 AM