[llvm] [AMDGPU] Add v2bf16 for opsel immediate folding (PR #82435)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-amdgpu

Author: Stanislav Mekhanoshin (rampitec)

<details>
<summary>Changes</summary>

This was previously enabled since v2bf16 was represented by v2f16. As of now it is NFC since we only have dot instructions which could use it, but currently folding is guarded by the hasDOTOpSelHazard().

---
Full diff: https://github.com/llvm/llvm-project/pull/82435.diff


1 Files Affected:

- (modified) llvm/lib/Target/AMDGPU/SIFoldOperands.cpp (+2) 


``````````diff
diff --git a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
index 8bf05682cbe7ea..d16d8ebd41a54f 100644
--- a/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
+++ b/llvm/lib/Target/AMDGPU/SIFoldOperands.cpp
@@ -219,8 +219,10 @@ bool SIFoldOperands::canUseImmWithOpSel(FoldCandidate &Fold) const {
   default:
     return false;
   case AMDGPU::OPERAND_REG_IMM_V2FP16:
+  case AMDGPU::OPERAND_REG_IMM_V2BF16:
   case AMDGPU::OPERAND_REG_IMM_V2INT16:
   case AMDGPU::OPERAND_REG_INLINE_C_V2FP16:
+  case AMDGPU::OPERAND_REG_INLINE_C_V2BF16:
   case AMDGPU::OPERAND_REG_INLINE_C_V2INT16:
     break;
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/82435