[llvm] [AArch64] Combine getActiveLaneMask with vector_extract (PR #81139)

[David Sherwood via llvm-commits]

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@@ -0,0 +1,90 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
+; RUN: llc -mattr=+sve    < %s | FileCheck %s -check-prefix CHECK-SVE
+; RUN: llc -mattr=+sve2p1 < %s | FileCheck %s -check-prefix CHECK-SVE2p1
+; RUN: llc -mattr=+sme2   < %s | FileCheck %s -check-prefix CHECK-SME2
+target triple = "aarch64-linux"
+
+; Test combining of getActiveLaneMask with a pair of extract_vector operations.
+
+define void @f0(i32 %i, i32 %n, ptr %p0, ptr %p1) #0 {
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david-arm wrote:

nit: Could you give the functions more meaningful names, such as `@lane_mask_2x_extract_nxv16i1_i32` or something like that? Not saying my suggestion is great, but it gives more detail about the operations.

https://github.com/llvm/llvm-project/pull/81139