[llvm] [LoongArch] Simplily fix extractelement on LA32 (PR #159564)

[via llvm-commits]

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@@ -2855,6 +2855,10 @@ LoongArchTargetLowering::lowerEXTRACT_VECTOR_ELT(SDValue Op,
   case MVT::v16i16:
   case MVT::v4i64:
   case MVT::v4f64: {
+    // TODO: Similar optimization can be applied for la32.
+    if (!Subtarget.is64Bit())
+      return SDValue();
+
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zhaoqi5 wrote:

Great suggestions. I will modify it later.

https://github.com/llvm/llvm-project/pull/159564