[llvm] [LV] Support generating masks for switch terminators. (PR #99808)

[via llvm-commits]

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@@ -231,9 +412,25 @@ define void @switch_all_to_default(ptr %start) {
 ; IC1-LABEL: define void @switch_all_to_default(
 ; IC1-SAME: ptr [[START:%.*]]) {
 ; IC1-NEXT:  [[ENTRY:.*]]:
+; IC1-NEXT:    br i1 false, label %[[SCALAR_PH:.*]], label %[[VECTOR_PH:.*]]
+; IC1:       [[VECTOR_PH]]:
+; IC1-NEXT:    br label %[[VECTOR_BODY:.*]]
+; IC1:       [[VECTOR_BODY]]:
+; IC1-NEXT:    [[INDEX:%.*]] = phi i64 [ 0, %[[VECTOR_PH]] ], [ [[INDEX_NEXT:%.*]], %[[VECTOR_BODY]] ]
+; IC1-NEXT:    [[TMP0:%.*]] = add i64 [[INDEX]], 0
+; IC1-NEXT:    [[TMP1:%.*]] = getelementptr inbounds i64, ptr [[START]], i64 [[TMP0]]
+; IC1-NEXT:    [[TMP2:%.*]] = getelementptr inbounds i64, ptr [[TMP1]], i32 0
+; IC1-NEXT:    store <2 x i64> <i64 42, i64 42>, ptr [[TMP2]], align 1
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ayalz wrote:

Nice!

https://github.com/llvm/llvm-project/pull/99808