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Commit 46dee4a3 authored by Philip Reames's avatar Philip Reames Committed by Philip Reames
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[RISCV][InsertVSETVLI] Split out demanded property for zero/non-zero of VL 

The scalar move instructions (vmv.s.x, and fvmv.s.f) depend solely on whether the VL is 0 or non-zero. By tracking the fact we only demand the zeroness and not the whole VL value, we can allow changing VL over a scalar move. This helps to eliminate vsetvli toggles.

Differential Revision: https://reviews.llvm.org/D140157
parent 609b7891
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