third_party/llvm-7.0/llvm/test/CodeGen/SystemZ/atomicrmw-sub-06.ll

; Test 64-bit atomic subtractions, z196 version.
;
; RUN: llc < %s -mtriple=s390x-linux-gnu -mcpu=z196 | FileCheck %s

; Check addition of a variable.
define i64 @f1(i64 %dummy, i64 *%src, i64 %b) {
; CHECK-LABEL: f1:
; CHECK: lcgr [[NEG:%r[0-5]]], %r4
; CHECK: laag %r2, [[NEG]], 0(%r3)
; CHECK: br %r14
  %res = atomicrmw sub i64 *%src, i64 %b seq_cst
  ret i64 %res
}

; Check addition of 1, which needs a temporary.
define i64 @f2(i64 %dummy, i64 *%src) {
; CHECK-LABEL: f2:
; CHECK: lghi [[TMP:%r[0-5]]], -1
; CHECK: laag %r2, [[TMP]], 0(%r3)
; CHECK: br %r14
  %res = atomicrmw sub i64 *%src, i64 1 seq_cst
  ret i64 %res
}

; Check the high end of the LAAG range.
define i64 @f3(i64 %dummy, i64 *%src, i64 %b) {
; CHECK-LABEL: f3:
; CHECK: lcgr [[NEG:%r[0-5]]], %r4
; CHECK: laag %r2, [[NEG]], 524280(%r3)
; CHECK: br %r14
  %ptr = getelementptr i64, i64 *%src, i64 65535
  %res = atomicrmw sub i64 *%ptr, i64 %b seq_cst
  ret i64 %res
}

; Check the next doubleword up, which needs separate address logic.
define i64 @f4(i64 %dummy, i64 *%src, i64 %b) {
; CHECK-LABEL: f4:
; CHECK-DAG: lcgr [[NEG:%r[0-5]]], %r4
; CHECK-DAG: agfi %r3, 524288
; CHECK: laag %r2, [[NEG]], 0(%r3)
; CHECK: br %r14
  %ptr = getelementptr i64, i64 *%src, i64 65536
  %res = atomicrmw sub i64 *%ptr, i64 %b seq_cst
  ret i64 %res
}

; Check the low end of the LAAG range.
define i64 @f5(i64 %dummy, i64 *%src, i64 %b) {
; CHECK-LABEL: f5:
; CHECK: lcgr [[NEG:%r[0-5]]], %r4
; CHECK: laag %r2, [[NEG]], -524288(%r3)
; CHECK: br %r14
  %ptr = getelementptr i64, i64 *%src, i64 -65536
  %res = atomicrmw sub i64 *%ptr, i64 %b seq_cst
  ret i64 %res
}

; Check the next doubleword down, which needs separate address logic.
define i64 @f6(i64 %dummy, i64 *%src, i64 %b) {
; CHECK-LABEL: f6:
; CHECK-DAG: lcgr [[NEG:%r[0-5]]], %r4
; CHECK-DAG: agfi %r3, -524296
; CHECK: laag %r2, [[NEG]], 0(%r3)
; CHECK: br %r14
  %ptr = getelementptr i64, i64 *%src, i64 -65537
  %res = atomicrmw sub i64 *%ptr, i64 %b seq_cst
  ret i64 %res
}