[llvm] [RISCV][NFC] Simplify ISD::SELECT Legality (PR #142650)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-risc-v

Author: Sam Elliott (lenary)

<details>
<summary>Changes</summary>

ISD::SELECT is legal by default, so this change to the conditional makes it clearer that XTHeadCondMov and XMipsCMove both leave this operation legal rather than custom expanding it.

---
Full diff: https://github.com/llvm/llvm-project/pull/142650.diff


1 Files Affected:

- (modified) llvm/lib/Target/RISCV/RISCVISelLowering.cpp (+1-3) 


``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 6e8e4ac1c6a95..6158e51346d77 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -434,9 +434,7 @@ RISCVTargetLowering::RISCVTargetLowering(const TargetMachine &TM,
     setOperationAction(ISD::ABS, MVT::i32, Custom);
   }
 
-  if (Subtarget.useCCMovInsn())
-    setOperationAction(ISD::SELECT, XLenVT, Legal);
-  else if (!Subtarget.hasVendorXTHeadCondMov())
+  if (!Subtarget.useCCMovInsn() && !Subtarget.hasVendorXTHeadCondMov())
     setOperationAction(ISD::SELECT, XLenVT, Custom);
 
   if (Subtarget.hasVendorXqcia() && !Subtarget.is64Bit()) {

``````````

</details>


https://github.com/llvm/llvm-project/pull/142650