llvm-project/llvm/test/Transforms/InstCombine/vscale_alloca.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -S -instcombine -verify < %s | FileCheck %s

define <vscale x 4 x i32> @alloca(<vscale x 4 x i32> %z) {
; CHECK-LABEL: @alloca(
; CHECK-NEXT:    ret <vscale x 4 x i32> [[Z:%.*]]
;
  %a = alloca <vscale x 4 x i32>
  store <vscale x 4 x i32> %z, <vscale x 4 x i32>* %a
  %load = load <vscale x 4 x i32>, <vscale x 4 x i32>* %a
  ret <vscale x 4 x i32> %load
}

define void @alloca_dead_store(<vscale x 4 x i32> %z) {
; CHECK-LABEL: @alloca_dead_store(
; CHECK-NEXT:    ret void
;
  %a = alloca <vscale x 4 x i32>
  store <vscale x 4 x i32> %z, <vscale x 4 x i32>* %a
  ret void
}

declare void @use(...)
define void @alloca_zero_byte_move_first_inst() {
; CHECK-LABEL: @alloca_zero_byte_move_first_inst(
; CHECK-NEXT:    [[B:%.*]] = alloca {}, align 8
; CHECK-NEXT:    [[A:%.*]] = alloca <vscale x 16 x i8>, align 16
; CHECK-NEXT:    call void (...) @use(<vscale x 16 x i8>* nonnull [[A]])
; CHECK-NEXT:    call void (...) @use({}* nonnull [[B]])
; CHECK-NEXT:    ret void
;
  %a = alloca <vscale x 16 x i8>
  call void (...) @use( <vscale x 16 x i8>* %a )
  %b = alloca {  }
  call void (...) @use( {  }* %b )
  ret void
}