[llvm-branch-commits] [llvm] [X86] Manage atomic load of fp -> int promotion in DAG (PR #120386)

[Matt Arsenault via llvm-branch-commits]

================
@@ -2639,6 +2639,10 @@ X86TargetLowering::X86TargetLowering(const 
X86TargetMachine &TM,
         setOperationAction(Op, MVT::f32, Promote);
   }
 
+  setOperationPromotedToType(ISD::ATOMIC_LOAD, MVT::f16, MVT::i16);
+  setOperationPromotedToType(ISD::ATOMIC_LOAD, MVT::f32, MVT::i32);
+  setOperationPromotedToType(ISD::ATOMIC_LOAD, MVT::f64, MVT::i64);
----------------
arsenm wrote:

This won't do anything without also overriding shouldCastAtomicLoadInIR. 
AtomicExpand will cast these, and these FP typed ATOMIC_LOADS will never form 

https://github.com/llvm/llvm-project/pull/120386
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