[X86] Remove X86Subtarget::isAtom and replace with tuning flags

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[X86] Remove X86Subtarget::isAtom and replace with tuning flags #62952

Open RKSimon opened 1 year ago

RKSimon commented 1 year ago

We still have special case handling for Atom (Bonnell) CPUs, behind a ST->isAtom() check - some of these might be entirely redundant (disabling vector interleaving might be better now with decent cost tables?), while others should be replaced with tuning flags:

[x] Disable promotion of i16 comparisons
[ ] Use ILP scheduling
[ ] Vector Interleaving
[ ] Optimal AntiDepBreakMode (#62875)

This would rid us of the last remaining CPU specific feature flag (ProcIntelAtom)

llvmbot commented 1 year ago

@llvm/issue-subscribers-backend-x86