File: splitstore-check-volatile.ll

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llvm-toolchain-9 1%3A9.0.1-16
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; Test that CodeGenPrepare respect the volatile flag when splitting a store.
;
; RUN: opt -S -codegenprepare -force-split-store < %s  | FileCheck %s

define void @fun(i16* %Src, i16* %Dst) {
; CHECK: store volatile i16 %8, i16* %Dst 
  %1 = load i16, i16* %Src
  %2 = trunc i16 %1 to i8
  %3 = lshr i16 %1, 8
  %4 = trunc i16 %3 to i8
  %5 = zext i8 %2 to i16
  %6 = zext i8 %4 to i16
  %7 = shl nuw i16 %6, 8
  %8 = or i16 %7, %5
  store volatile i16 %8, i16* %Dst
  ret void
}