test/Transforms/PhaseOrdering/dse-ephemeral-value-captures.ll

; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 2
; RUN: opt -passes='function(dse),cgscc(inline),function(sroa,gvn,sccp)' -S %s | FileCheck %s

declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture)

declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture)

declare void @llvm.assume(i1 noundef)

declare i1 @cond() #0

define internal i1 @check_cond(ptr %a) #0 {
  %l = load i32, ptr %a
  %c = icmp eq i32 %l, 1
  br i1 %c, label %then, label %else

then:
  %res = call i1 @cond()
  ret i1 %res

else:
  ret i1 0
}

define i32 @test() {
; CHECK-LABEL: define i32 @test() {
; CHECK-NEXT:  entry:
; CHECK-NEXT:    br label [[THEN_I:%.*]]
; CHECK:       then.i:
; CHECK-NEXT:    [[RES_I:%.*]] = call i1 @cond()
; CHECK-NEXT:    br label [[CHECK_COND_EXIT:%.*]]
; CHECK:       check_cond.exit:
; CHECK-NEXT:    call void @llvm.assume(i1 [[RES_I]])
; CHECK-NEXT:    ret i32 0
;
entry:
  %a = alloca i32, align 4
  call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %a)
  store i32 1, ptr %a, align 4
  %res = call i1 @check_cond(ptr %a)
  call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %a)
  call void @llvm.assume(i1 %res)
  ret i32 0
}

attributes #0 = { nounwind readonly willreturn }