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; RUN: opt -codegenprepare -S < %s | FileCheck %s
target triple = "armv8m.main-none-eabi"
declare ptr @f0()
declare ptr @f1()
declare void @llvm.lifetime.start.p0(i64, ptr nocapture) nounwind
declare void @llvm.lifetime.end.p0(i64, ptr nocapture) nounwind
define ptr @tail_dup() {
; CHECK-LABEL: tail_dup
; CHECK: tail call ptr @f0()
; CHECK-NEXT: ret ptr
; CHECK: tail call ptr @f1()
; CHECK-NEXT: ret ptr
bb0:
%a = alloca i32
call void @llvm.lifetime.start.p0(i64 -1, ptr %a) nounwind
%tmp0 = tail call ptr @f0()
br label %return
bb1:
%tmp1 = tail call ptr @f1()
br label %return
return:
%retval = phi ptr [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
call void @llvm.lifetime.end.p0(i64 -1, ptr %a) nounwind
ret ptr %retval
}
define nonnull ptr @nonnull_dup() {
; CHECK-LABEL: nonnull_dup
; CHECK: tail call ptr @f0()
; CHECK-NEXT: ret ptr
; CHECK: tail call ptr @f1()
; CHECK-NEXT: ret ptr
bb0:
%tmp0 = tail call ptr @f0()
br label %return
bb1:
%tmp1 = tail call ptr @f1()
br label %return
return:
%retval = phi ptr [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
ret ptr %retval
}
define ptr @noalias_dup() {
; CHECK-LABEL: noalias_dup
; CHECK: tail call noalias ptr @f0()
; CHECK-NEXT: ret ptr
; CHECK: tail call noalias ptr @f1()
; CHECK-NEXT: ret ptr
bb0:
%tmp0 = tail call noalias ptr @f0()
br label %return
bb1:
%tmp1 = tail call noalias ptr @f1()
br label %return
return:
%retval = phi ptr [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
ret ptr %retval
}
; Use inreg as a way of testing that attributes (other than nonnull and
; noalias) disable the tailcall duplication in cgp.
define inreg ptr @inreg_nodup() {
; CHECK-LABEL: inreg_nodup
; CHECK: tail call ptr @f0()
; CHECK-NEXT: br label %return
; CHECK: tail call ptr @f1()
; CHECK-NEXT: br label %return
bb0:
%tmp0 = tail call ptr @f0()
br label %return
bb1:
%tmp1 = tail call ptr @f1()
br label %return
return:
%retval = phi ptr [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
ret ptr %retval
}
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