[PATCH] D103903: [ARM] Transform a fixed-point to floating-point conversion into a VCVT_fix

[Sam Tebbs via Phabricator via llvm-commits]

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Conversion from a fixed-point number to a floating-point number is done by multiplying the fixed-point number by 2^(-n) where n is the number of fractional bits. Currently this is lowered to a vcvt (integer to floating-point) then a vmul, but it can instead be lowered directly to a vcvt (fixed-point to floating-point). This patch enables such transformations as long as the multiplication factor is a power of 2.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D103903

Files:
  llvm/lib/Target/ARM/ARMISelDAGToDAG.cpp
  llvm/test/CodeGen/ARM/arm_q15_to_float_autovec.ll

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