llvm-project/llvm/test/CodeGen/SystemZ/int-const-04.ll

; Test moves of integers to 2-byte memory locations.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s

; Check the low end of the unsigned range.
define void @f1(i16 *%ptr) {
; CHECK: f1:
; CHECK: mvhhi 0(%r2), 0
; CHECK: br %r14
  store i16 0, i16 *%ptr
  ret void
}

; Check the high end of the signed range.
define void @f2(i16 *%ptr) {
; CHECK: f2:
; CHECK: mvhhi 0(%r2), 32767
; CHECK: br %r14
  store i16 32767, i16 *%ptr
  ret void
}

; Check the next value up.
define void @f3(i16 *%ptr) {
; CHECK: f3:
; CHECK: mvhhi 0(%r2), -32768
; CHECK: br %r14
  store i16 -32768, i16 *%ptr
  ret void
}

; Check the high end of the unsigned range.
define void @f4(i16 *%ptr) {
; CHECK: f4:
; CHECK: mvhhi 0(%r2), -1
; CHECK: br %r14
  store i16 65535, i16 *%ptr
  ret void
}

; Check -1.
define void @f5(i16 *%ptr) {
; CHECK: f5:
; CHECK: mvhhi 0(%r2), -1
; CHECK: br %r14
  store i16 -1, i16 *%ptr
  ret void
}

; Check the low end of the signed range.
define void @f6(i16 *%ptr) {
; CHECK: f6:
; CHECK: mvhhi 0(%r2), -32768
; CHECK: br %r14
  store i16 -32768, i16 *%ptr
  ret void
}

; Check the next value down.
define void @f7(i16 *%ptr) {
; CHECK: f7:
; CHECK: mvhhi 0(%r2), 32767
; CHECK: br %r14
  store i16 -32769, i16 *%ptr
  ret void
}

; Check the high end of the MVHHI range.
define void @f8(i16 *%a) {
; CHECK: f8:
; CHECK: mvhhi 4094(%r2), 42
; CHECK: br %r14
  %ptr = getelementptr i16 *%a, i64 2047
  store i16 42, i16 *%ptr
  ret void
}

; Check the next halfword up, which needs separate address logic.
; Other sequences besides this one would be OK.
define void @f9(i16 *%a) {
; CHECK: f9:
; CHECK: aghi %r2, 4096
; CHECK: mvhhi 0(%r2), 42
; CHECK: br %r14
  %ptr = getelementptr i16 *%a, i64 2048
  store i16 42, i16 *%ptr
  ret void
}

; Check negative displacements, which also need separate address logic.
define void @f10(i16 *%a) {
; CHECK: f10:
; CHECK: aghi %r2, -2
; CHECK: mvhhi 0(%r2), 42
; CHECK: br %r14
  %ptr = getelementptr i16 *%a, i64 -1
  store i16 42, i16 *%ptr
  ret void
}

; Check that MVHHI does not allow an index
define void @f11(i64 %src, i64 %index) {
; CHECK: f11:
; CHECK: agr %r2, %r3
; CHECK: mvhhi 0(%r2), 42
; CHECK: br %r14
  %add = add i64 %src, %index
  %ptr = inttoptr i64 %add to i16 *
  store i16 42, i16 *%ptr
  ret void
}