[llvm] [RISCV][llvm] Preliminary P extension codegen support (PR #162668)

[via llvm-commits]

github-actions[bot] wrote:

<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


:warning: C/C++ code formatter, clang-format found issues in your code. :warning:

<details>
<summary>
You can test this locally with the following command:
</summary>

``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/RISCV/RISCVISelLowering.cpp llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
``````````

:warning:
The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
:warning:

</details>

<details>
<summary>
View the diff from clang-format here.
</summary>

``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
index e669175a3..a07d441b4 100644
--- a/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
+++ b/llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
@@ -1635,7 +1635,8 @@ InstructionCost RISCVTTIImpl::getCastInstrCost(unsigned Opcode, Type *Dst,
   // TODO: Add proper cost model for P extension fixed vectors (e.g., v4i16)
   // For now, skip all fixed vector cost analysis when P extension is available
   // to avoid crashes in getMinRVVVectorSizeInBits()
-  if (ST->hasStdExtP() && (isa<FixedVectorType>(Dst) || isa<FixedVectorType>(Src))) {
+  if (ST->hasStdExtP() &&
+      (isa<FixedVectorType>(Dst) || isa<FixedVectorType>(Src))) {
     return 1; // Treat as single instruction cost for now
   }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/162668