derek.holloway
7502bf64a4
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83 lines
1.9 KiB
LLVM
83 lines
1.9 KiB
LLVM
; RUN: opt -passes='require<profile-summary>,function(codegenprepare)' -S < %s | FileCheck %s
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target triple = "armv8m.main-none-eabi"
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declare ptr @f0()
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declare ptr @f1()
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declare void @llvm.lifetime.start.p0(ptr nocapture) nounwind
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declare void @llvm.lifetime.end.p0(ptr nocapture) nounwind
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define ptr @tail_dup() {
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; CHECK-LABEL: tail_dup
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; CHECK: tail call ptr @f0()
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; CHECK-NEXT: ret ptr
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; CHECK: tail call ptr @f1()
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; CHECK-NEXT: ret ptr
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bb0:
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%a = alloca i32
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call void @llvm.lifetime.start.p0(ptr %a) nounwind
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%tmp0 = tail call ptr @f0()
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br label %return
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bb1:
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%tmp1 = tail call ptr @f1()
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br label %return
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return:
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%retval = phi ptr [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
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call void @llvm.lifetime.end.p0(ptr %a) nounwind
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ret ptr %retval
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}
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define nonnull ptr @nonnull_dup() {
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; CHECK-LABEL: nonnull_dup
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; CHECK: tail call ptr @f0()
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; CHECK-NEXT: ret ptr
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; CHECK: tail call ptr @f1()
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; CHECK-NEXT: ret ptr
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bb0:
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%tmp0 = tail call ptr @f0()
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br label %return
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bb1:
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%tmp1 = tail call ptr @f1()
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br label %return
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return:
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%retval = phi ptr [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
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ret ptr %retval
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}
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define ptr @noalias_dup() {
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; CHECK-LABEL: noalias_dup
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; CHECK: tail call noalias ptr @f0()
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; CHECK-NEXT: ret ptr
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; CHECK: tail call noalias ptr @f1()
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; CHECK-NEXT: ret ptr
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bb0:
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%tmp0 = tail call noalias ptr @f0()
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br label %return
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bb1:
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%tmp1 = tail call noalias ptr @f1()
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br label %return
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return:
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%retval = phi ptr [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
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ret ptr %retval
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}
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; Use inreg as a way of testing that attributes (other than nonnull and
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; noalias) disable the tailcall duplication in cgp.
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define inreg ptr @inreg_nodup() {
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; CHECK-LABEL: inreg_nodup
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; CHECK: tail call ptr @f0()
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; CHECK-NEXT: br label %return
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; CHECK: tail call ptr @f1()
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; CHECK-NEXT: br label %return
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bb0:
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%tmp0 = tail call ptr @f0()
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br label %return
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bb1:
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%tmp1 = tail call ptr @f1()
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br label %return
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return:
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%retval = phi ptr [ %tmp0, %bb0 ], [ %tmp1, %bb1 ]
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ret ptr %retval
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}
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