llvm/test/CodeGen/SystemZ/merge-stores.ll

; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=s390x-linux-gnu -pre-RA-sched=list-ilp -disable-sched-live-uses=false | FileCheck %s

target datalayout = "E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-v128:64-a:8:16-n32:64"

%struct.a = type { i16, i32 }

@e = dso_local global %struct.a { i16 9, i32 0 }, align 8
@f = dso_local local_unnamed_addr global ptr @e, align 8
@d = dso_local local_unnamed_addr global i32 0, align 4

; This shows a miscompile caused by merging truncated
; stores if the store of 0 (sthrl) to 'e' happens before
; a 64-bit store (stg) of r0. The store of r0 can follow
; the store to 'e' only if it is a 32-bit store (st).

define signext i32 @main() {
; CHECK-LABEL: main:
; CHECK:       # %bb.0:
; CHECK-NEXT:    lgrl %r0, e
; CHECK-NEXT:    lgrl %r1, f
; CHECK-NEXT:    srlg %r2, %r0, 32
; CHECK-NEXT:    st %r2, 0(%r1)
; CHECK-NEXT:    lhi %r2, 0
; CHECK-NEXT:    sthrl %r2, e
; CHECK-NEXT:    st %r0, 4(%r1)
; CHECK-NEXT:    lghi %r2, 0
; CHECK-NEXT:    strl %r0, d
; CHECK-NEXT:    br %r14
  %e = load i64, ptr @e, align 8
  %esh = lshr i64 %e, 32
  %ehi = trunc i64 %esh to i32
  %elo = trunc i64 %e to i32
  %t1 = load ptr, ptr @f, align 8
  store i32 %ehi, ptr %t1, align 4
  %f4 = getelementptr inbounds i8, ptr %t1, i64 4
  store i32 %elo, ptr %f4, align 4
  store i16 0, ptr @e, align 8
  store i32 %elo, ptr @d, align 4
  ret i32 0
}