derek.holloway
7502bf64a4
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55 lines
1.9 KiB
LLVM
55 lines
1.9 KiB
LLVM
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
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; RUN: opt < %s -S -passes=globalopt | FileCheck %s
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declare dso_local i32 @atexit(ptr)
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define dso_local void @empty_atexit_handler() {
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; CHECK-LABEL: define dso_local void @empty_atexit_handler() local_unnamed_addr {
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; CHECK-NEXT: ret void
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;
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ret void
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}
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; Check that `atexit` is removed if the handler is empty.
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; Check that a removed `atexit` call returns `0` which is the value that denotes success.
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define dso_local noundef i32 @register_atexit_handler() {
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; CHECK-LABEL: define dso_local noundef i32 @register_atexit_handler() local_unnamed_addr {
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; CHECK-NEXT: ret i32 0
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;
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%1 = call i32 @atexit(ptr @empty_atexit_handler)
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ret i32 %1
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}
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declare dso_local void @declared_atexit_handler()
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; Check that an atexit handler with only a declaration is not removed.
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define dso_local noundef i32 @register_declared_atexit_handler() {
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; CHECK-LABEL: define dso_local noundef i32 @register_declared_atexit_handler() local_unnamed_addr {
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @atexit(ptr @declared_atexit_handler)
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; CHECK-NEXT: ret i32 [[TMP1]]
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;
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%1 = call i32 @atexit(ptr @declared_atexit_handler)
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ret i32 %1
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}
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declare dso_local void @external_exit_func()
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define dso_local void @nonempty_atexit_handler() {
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; CHECK-LABEL: define dso_local void @nonempty_atexit_handler() {
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; CHECK-NEXT: call void @external_exit_func()
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; CHECK-NEXT: ret void
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;
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call void @external_exit_func()
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ret void
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}
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; Check that an atexit handler that consists of any instructions other than `ret` is considered nonempty and not removed.
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define dso_local noundef i32 @register_nonempty_atexit_handler() {
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; CHECK-LABEL: define dso_local noundef i32 @register_nonempty_atexit_handler() local_unnamed_addr {
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; CHECK-NEXT: [[TMP1:%.*]] = call i32 @atexit(ptr @nonempty_atexit_handler)
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; CHECK-NEXT: ret i32 [[TMP1]]
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;
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%1 = call i32 @atexit(ptr @nonempty_atexit_handler)
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ret i32 %1
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}
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