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; RUN: opt -codegenprepare -S < %s | FileCheck %s
target triple = "armv8m.main-none-eabi"
declare i8* @f0()
declare i8* @f1()
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind
define i8* @tail_dup() {
; CHECK-LABEL: tail_dup
; CHECK: tail call i8* @f0()
; CHECK-NEXT: ret i8*
; CHECK: tail call i8* @f1()
; CHECK-NEXT: ret i8*
bb0:
%a = alloca i32
%a1 = bitcast i32* %a to i8*
call void @llvm.lifetime.start.p0i8(i64 -1, i8* %a1) nounwind
%tmp0 = tail call i8* @f0()
br label %return
bb1:
%tmp1 = tail call i8* @f1()
br label %return
return:
%retval = phi i8* [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
%a2 = bitcast i32* %a to i8*
call void @llvm.lifetime.end.p0i8(i64 -1, i8* %a2) nounwind
ret i8* %retval
}
define nonnull i8* @nonnull_dup() {
; CHECK-LABEL: nonnull_dup
; CHECK: tail call i8* @f0()
; CHECK-NEXT: ret i8*
; CHECK: tail call i8* @f1()
; CHECK-NEXT: ret i8*
bb0:
%tmp0 = tail call i8* @f0()
br label %return
bb1:
%tmp1 = tail call i8* @f1()
br label %return
return:
%retval = phi i8* [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
ret i8* %retval
}
define i8* @noalias_dup() {
; CHECK-LABEL: noalias_dup
; CHECK: tail call noalias i8* @f0()
; CHECK-NEXT: ret i8*
; CHECK: tail call noalias i8* @f1()
; CHECK-NEXT: ret i8*
bb0:
%tmp0 = tail call noalias i8* @f0()
br label %return
bb1:
%tmp1 = tail call noalias i8* @f1()
br label %return
return:
%retval = phi i8* [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
ret i8* %retval
}
; Use inreg as a way of testing that attributes (other than nonnull and
; noalias) disable the tailcall duplication in cgp.
define inreg i8* @inreg_nodup() {
; CHECK-LABEL: inreg_nodup
; CHECK: tail call i8* @f0()
; CHECK-NEXT: br label %return
; CHECK: tail call i8* @f1()
; CHECK-NEXT: br label %return
bb0:
%tmp0 = tail call i8* @f0()
br label %return
bb1:
%tmp1 = tail call i8* @f1()
br label %return
return:
%retval = phi i8* [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
ret i8* %retval
}
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