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Commit d70e9195 authored by luxufan's avatar luxufan Committed by Craig Topper
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[RISCV] Optimize getVLENFactoredAmount function. 

If the local variable `NumOfVReg` isPowerOf2_32(NumOfVReg - 1) or isPowerOf2_32(NumOfVReg + 1), the ADDI and MUL instructions can be replaced with SLLI and ADD(or SUB) instructions.

Based on original patch by StephenFan.

Reviewed By: frasercrmck, StephenFan

Differential Revision: https://reviews.llvm.org/D100577
parent d35bd986
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