File: rotate.ll

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llvm-toolchain-19 1%3A19.1.7-3~deb12u1
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; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=thumbv8--linux-gnueabihf | FileCheck %s

;; This used to cause a backend crash about not being able to
;; select ROTL. Make sure if generates the basic VSHL/VSHR.
define <2 x i64> @testcase(ptr %in) {
; CHECK-LABEL: testcase:
; CHECK:       @ %bb.0:
; CHECK-NEXT:    vld1.64 {d16, d17}, [r0]
; CHECK-NEXT:    vshr.u64 q9, q8, #8
; CHECK-NEXT:    vshl.i64 q8, q8, #56
; CHECK-NEXT:    vorr q0, q8, q9
; CHECK-NEXT:    bx lr
  %1 = load <2 x i64>, ptr %in
  %2 = lshr <2 x i64> %1, <i64 8, i64 8>
  %3 = shl <2 x i64> %1, <i64 56, i64 56>
  %4 = or <2 x i64> %2, %3
  ret <2 x i64> %4
}