Craig Topper 1d8bbe3d25 [RISCV] Implement a basic version of AArch64RedundantCopyElimination pass. ...

Using AArch64's original implementation for reference, this patch
implements a pass to remove unneeded copies of X0. This pass runs
after register allocation and looks to see if a register is implied
to be 0 by a branch in the predecessor basic block.

Reviewed By: asb

Differential Revision: https://reviews.llvm.org/D118160

2022-02-04 10:43:46 -08:00

100 KiB

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