[libc] [llvm] [libcxx] [compiler-rt] [flang] [lld] [clang] Fix ISel crash when lowering BUILD_VECTOR (PR #73186)

[Phoebe Wang via cfe-commits]

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@@ -7254,6 +7255,10 @@ static SDValue lowerBuildVectorAsBroadcast(BuildVectorSDNode *BVOp,
     EVT CVT = Ld.getValueType();
     assert(!CVT.isVector() && "Must not broadcast a vector type");
 
+    // 512 bit vpbroadcastw is only available with AVX512BW
+    if (ScalarSize == 16 && IsGT256 && !Subtarget.hasBWI())
+      return SDValue();
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phoebewang wrote:

The problem only exists for `v32f16` which is not handled by `PreprocessISelDAG`. Maybe we need add `v32f16` support there.

https://github.com/llvm/llvm-project/pull/73186