llvm/test/CodeGen/AArch64/sve-fixed-length-shuffles.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s | FileCheck %s

target triple = "aarch64-unknown-linux-gnu"

; Currently there is no custom lowering for vector shuffles operating on types
; bigger than NEON. However, having no support opens us up to a code generator
; hang when expanding BUILD_VECTOR. Here we just validate the promblematic case
; successfully exits code generation.
define void @hang_when_merging_stores_after_legalisation(ptr %a, <2 x i32> %b) vscale_range(2,2) #0 {
; CHECK-LABEL: hang_when_merging_stores_after_legalisation:
; CHECK:       // %bb.0:
; CHECK-NEXT:    // kill: def $d0 killed $d0 def $z0
; CHECK-NEXT:    mov z0.s, s0
; CHECK-NEXT:    movprfx z1, z0
; CHECK-NEXT:    ext z1.b, z1.b, z0.b, #16
; CHECK-NEXT:    st2 { v0.4s, v1.4s }, [x0]
; CHECK-NEXT:    ret
  %splat = shufflevector <2 x i32> %b, <2 x i32> poison, <8 x i32> zeroinitializer
  %interleaved.vec = shufflevector <8 x i32> %splat, <8 x i32> poison, <8 x i32> <i32 0, i32 4, i32 1, i32 5, i32 2, i32 6, i32 3, i32 7>
  store <8 x i32> %interleaved.vec, ptr %a, align 4
  ret void
}

; Ensure we don't crash when trying to lower a shuffle via an extract
define void @crash_when_lowering_extract_shuffle(ptr %dst, i1 %cond) vscale_range(2,2) #0 {
; CHECK-LABEL: crash_when_lowering_extract_shuffle:
; CHECK:       // %bb.0:
; CHECK-NEXT:    ret
  %broadcast.splat = shufflevector <32 x i1> zeroinitializer, <32 x i1> zeroinitializer, <32 x i32> zeroinitializer
  br i1 %cond, label %exit, label %vector.body

vector.body:
  %1 = load <32 x i32>, ptr %dst, align 16
  %predphi = select <32 x i1> %broadcast.splat, <32 x i32> zeroinitializer, <32 x i32> %1
  store <32 x i32> %predphi, ptr %dst, align 16
  br label %exit

exit:
  ret void
}

attributes #0 = { "target-features"="+sve" }