[llvm] [RISCV][GlobalISel] Legalize G_ADD, G_SUB, G_AND, G_OR, G_XOR on RISC-V Vector Extension (PR #71400)

[Michael Maitland via llvm-commits]

================
@@ -31,15 +31,55 @@ RISCVLegalizerInfo::RISCVLegalizerInfo(const RISCVSubtarget &ST) {
   const LLT s32 = LLT::scalar(32);
   const LLT s64 = LLT::scalar(64);
 
+  const LLT nxv1s8 = LLT::scalable_vector(1, s8);
+  const LLT nxv2s8 = LLT::scalable_vector(2, s8);
+  const LLT nxv4s8 = LLT::scalable_vector(4, s8);
+  const LLT nxv8s8 = LLT::scalable_vector(8, s8);
+  const LLT nxv16s8 = LLT::scalable_vector(16, s8);
+  const LLT nxv32s8 = LLT::scalable_vector(32, s8);
+  const LLT nxv64s8 = LLT::scalable_vector(64, s8);
+
+  const LLT nxv1s16 = LLT::scalable_vector(1, s16);
+  const LLT nxv2s16 = LLT::scalable_vector(2, s16);
+  const LLT nxv4s16 = LLT::scalable_vector(4, s16);
+  const LLT nxv8s16 = LLT::scalable_vector(8, s16);
+  const LLT nxv16s16 = LLT::scalable_vector(16, s16);
+  const LLT nxv32s16 = LLT::scalable_vector(32, s16);
+
+  const LLT nxv1s32 = LLT::scalable_vector(1, s32);
+  const LLT nxv2s32 = LLT::scalable_vector(2, s32);
+  const LLT nxv4s32 = LLT::scalable_vector(4, s32);
+  const LLT nxv8s32 = LLT::scalable_vector(8, s32);
+  const LLT nxv16s32 = LLT::scalable_vector(16, s32);
+
+  const LLT nxv1s64 = LLT::scalable_vector(1, s64);
+  const LLT nxv2s64 = LLT::scalable_vector(2, s64);
+  const LLT nxv4s64 = LLT::scalable_vector(4, s64);
+  const LLT nxv8s64 = LLT::scalable_vector(8, s64);
+
   using namespace TargetOpcode;
 
+  const std::initializer_list<LLT> scalarLegalTypes = {s32, sXLen};
+  const std::initializer_list<LLT> vExtendedLegalTypes = {
+      s32,     sXLen,    nxv1s8,   nxv2s8,  nxv4s8,  nxv8s8,
+      nxv16s8, nxv32s8,  nxv64s8,  nxv1s16, nxv2s16, nxv4s16,
+      nxv8s16, nxv16s16, nxv32s16, nxv1s32, nxv2s32, nxv4s32,
+      nxv8s32, nxv16s32, nxv1s64,  nxv2s64, nxv4s64, nxv8s64};
+
+  auto LegalTypes = [&]() -> const std::initializer_list<LLT> & {
+    if (ST.hasVInstructions()) {
+      return vExtendedLegalTypes;
+    } else {
+      return scalarLegalTypes;
+    }
+  }();
----------------
michaelmaitland wrote:

Can this lambda be simplified to `auto LegalTypes = ST.hasVInstructions() ? vExtendedLegalTypes : scalarLegalTypes;`?

https://github.com/llvm/llvm-project/pull/71400