[llvm] [AMDGPU] Don't fold an i64 immediate value if it can't be replicated from its lower 32-bit (PR #168458)

[Stanislav Mekhanoshin via llvm-commits]

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@@ -766,6 +771,34 @@ static void appendFoldCandidate(SmallVectorImpl<FoldCandidate> &FoldList,
                       FoldCandidate(MI, OpNo, FoldOp, Commuted, ShrinkOp));
 }
 
+// Returns true if the instruction is a packed f32 instruction that only reads
+// 32 bits from a scalar operand (SGPR or literal) and replicates the bits to
+// both channels.
+static bool isPKF32Instr(const GCNSubtarget *ST, MachineInstr *MI) {
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rampitec wrote:

The name of the helper is not sound. It shall have something about the replication behavior.

https://github.com/llvm/llvm-project/pull/168458