Commits on Sep 20, 2023

1. [SVE][CodeGenPrepare] Sink address calculations that match SVE gather… …

   …/scatter addressing modes.
   
   SVE supports scalar+vector and scalar+extw(vector) addressing modes.
   However, the masked gather/scatter intrinsics take a vector of
   addresses, which means address computations can be hoisted out of
   loops.  The is especially true for things like offsets where the
   true size of offsets is lost by the time you get to code generation.
   
   This is problematic because it forces the code generator to legalise
   towards `<vscale x 2 x ty>` vectors that will not maximise bandwidth
   if the main block datatypes is in fact i32 or smaller.
   
   This patch sinks GEPs and extends for cases where one of the above
   addressing modes can be used.
   
   NOTE: There are cases where it would be better to split the extend
   in two with one half hoisted out of a loop and the other within the
   loop.  Whilst true I think this switch of default is still better
   than before because the extra extends are an improvement over being
   forced to split a gather/scatter.

   

   paulwalker-arm committed Sep 20, 2023
   Configuration menu

   • View commit details
   • Copy full SHA for efb9e83
   • Browse repository at this point

   Copy the full SHA

   efb9e83 View commit details

   Browse the repository at this point in the history