[llvm] [ConstantFolding] Add folding for [de]interleave2, insert and extract (PR #141301)

[Luke Lau via llvm-commits]

================
@@ -0,0 +1,100 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt < %s -passes=instsimplify,verify -disable-verify -S | FileCheck %s
+
+define <3 x i32> @fold_vector_extract() {
+; CHECK-LABEL: define <3 x i32> @fold_vector_extract() {
+; CHECK-NEXT:    ret <3 x i32> <i32 3, i32 4, i32 5>
+;
+  %1 = call <3 x i32> @llvm.vector.extract.v3i32.v8i32(<8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>, i64 3)
+  ret <3 x i32> %1
+}
+
+ at a = external global i16, align 1
+
+define <3 x i32> @fold_vector_extract_constexpr() {
+; CHECK-LABEL: define <3 x i32> @fold_vector_extract_constexpr() {
+; CHECK-NEXT:    ret <3 x i32> <i32 ptrtoint (ptr @a to i32), i32 1, i32 2>
+;
+  %1 = call <3 x i32> @llvm.vector.extract.v3i32.v8i32(<8 x i32> <i32 ptrtoint (ptr @a to i32), i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>, i64 0)
+  ret <3 x i32> %1
+}
+
+define <3 x i32> @fold_vector_extract_last_poison() {
+; CHECK-LABEL: define <3 x i32> @fold_vector_extract_last_poison() {
+; CHECK-NEXT:    ret <3 x i32> <i32 6, i32 7, i32 poison>
+;
+  %1 = call <3 x i32> @llvm.vector.extract.v3i32.v8i32(<8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>, i64 6)
+  ret <3 x i32> %1
+}
+
+define <3 x i32> @fold_vector_extract_poison() {
+; CHECK-LABEL: define <3 x i32> @fold_vector_extract_poison() {
+; CHECK-NEXT:    ret <3 x i32> poison
+;
+  %1 = call <3 x i32> @llvm.vector.extract.v3i32.v8i32(<8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>, i64 8)
+  ret <3 x i32> %1
+}
+
+define <8 x i32> @fold_vector_extract_nop() {
+; CHECK-LABEL: define <8 x i32> @fold_vector_extract_nop() {
+; CHECK-NEXT:    ret <8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>
+;
+  %1 = call <8 x i32> @llvm.vector.extract.v3i32.v8i32(<8 x i32> <i32 0, i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7>, i64 0)
+  ret <8 x i32> %1
+}
+
+define <8 x i32> @fold_vector_insert() {
+; CHECK-LABEL: define <8 x i32> @fold_vector_insert() {
+; CHECK-NEXT:    ret <8 x i32> <i32 9, i32 10, i32 11, i32 12, i32 5, i32 6, i32 7, i32 8>
+;
+  %1 = call <8 x i32> @llvm.vector.insert.v8i32(<8 x i32> <i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8>, <4 x i32> <i32 9, i32 10, i32 11, i32 12>, i64 0)
+  ret <8 x i32> %1
+}
+
+define <8 x i32> @fold_vector_insert_nop() {
+; CHECK-LABEL: define <8 x i32> @fold_vector_insert_nop() {
+; CHECK-NEXT:    ret <8 x i32> <i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18>
+;
+  %1 = call <8 x i32> @llvm.vector.insert.v8i32(<8 x i32> <i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8>, <8 x i32> <i32 11, i32 12, i32 13, i32 14, i32 15, i32 16, i32 17, i32 18>, i64 0)
+  ret <8 x i32> %1
+}
+
+define <8 x i32> @fold_vector_insert_poison_idx_range() {
+; CHECK-LABEL: define <8 x i32> @fold_vector_insert_poison_idx_range() {
+; CHECK-NEXT:    ret <8 x i32> poison
+;
+  %1 = call <8 x i32> @llvm.vector.insert.v8i32(<8 x i32> <i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8>, <6 x i32> <i32 9, i32 10, i32 11, i32 12, i32 13, i32 14>, i64 6)
+  ret <8 x i32> %1
+}
+
+define <8 x i32> @fold_vector_insert_poison_large_idx() {
+; CHECK-LABEL: define <8 x i32> @fold_vector_insert_poison_large_idx() {
+; CHECK-NEXT:    ret <8 x i32> poison
+;
+  %1 = call <8 x i32> @llvm.vector.insert.v8i32(<8 x i32> <i32 1, i32 2, i32 3, i32 4, i32 5, i32 6, i32 7, i32 8>, <6 x i32> <i32 9, i32 10, i32 11, i32 12, i32 13, i32 14>, i64 -2)
+  ret <8 x i32> %1
+}
+
+define <8 x i32> @fold_vector_interleave2() {
+; CHECK-LABEL: define <8 x i32> @fold_vector_interleave2() {
+; CHECK-NEXT:    ret <8 x i32> <i32 1, i32 5, i32 2, i32 6, i32 3, i32 7, i32 4, i32 8>
+;
+  %1 = call<8 x i32> @llvm.vector.interleave2.v8i32(<4 x i32> <i32 1, i32 2, i32 3, i32 4>, <4 x i32> <i32 5, i32 6, i32 7, i32 8>)
----------------
lukel97 wrote:

```suggestion
  %1 = call <8 x i32> @llvm.vector.interleave2.v8i32(<4 x i32> <i32 1, i32 2, i32 3, i32 4>, <4 x i32> <i32 5, i32 6, i32 7, i32 8>)
```

https://github.com/llvm/llvm-project/pull/141301