[llvm] [AMDGPU] Add OMOD folding for TRANS bfloat16 instructions (PR #208595)

[Shilei Tian via llvm-commits]

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@@ -2363,6 +2358,117 @@ SIFoldOperandsImpl::isOMod(const MachineInstr &MI) const {
 
     return std::pair(nullptr, SIOutMods::NONE);
   }
+  case AMDGPU::V_FMA_MIXLO_BF16:
+  case AMDGPU::V_FMA_MIX_BF16_t16: {
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shiltian wrote:

why only the true16 version?

https://github.com/llvm/llvm-project/pull/208595