[PATCH] D54719: [Intrinsic] Signed Fixed Point Multiplication Intrinsic

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

Do we have examples of real hardware that implements this sort of instruction?

Right now this intrinsic looks like its just reimplementing what you would get if you just emitted this IR

  %a = sext iX %x to i2X
  %b = sext iX %y to i2X
  %c = mul i2X %a, %b
  %d = lshr i2X %c, PRECISION
  %e = trunc i2X %d to iX

So I'm not sure if there's a need for an intrinsic unless that pattern is difficult to match to an instruction.


Repository:
  rL LLVM

https://reviews.llvm.org/D54719