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cpw_sr
2019 Aug 23
2
Using [GlobalISel] to provide peephole optimizations
...tructions to exist on the input side of Pat<>, and using the same
InstructionSelector we already have to reselect.
To my surprise... not many changes are required to seemingly make this work:
// fold loads in to compare instructions
def : Pat<(CPw_sr i32:$k, (MOVw_wf iPTR:$s)), (CPw_sf i32:$k, iPTR:$s)>;
And it looks like SDNodeXForms will work off the bat, along with complex
renderers. The main catches being with constants that require checking (due
G_CONSTANT being handled differently to immediates), along with needing to
add checks that the instruction has the same implici...