a2347baaec
Because references must be initialized using some evaluated expression, they must point to something, and a callee can assume the reference parameter is dereferenceable. Taking advantage of a new attribute just added to LLVM, mark them as such. Because dereferenceability in addrspace(0) implies nonnull in the backend, we don't need both attributes. However, we need to know the size of the object to use the dereferenceable attribute, so for incomplete types we still emit only nonnull. llvm-svn: 213386
27 lines
742 B
C++
27 lines
742 B
C++
// RUN: %clang_cc1 -std=c++11 -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
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int &f();
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// CHECK: @r = thread_local global i32* null
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thread_local int &r = f();
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// CHECK: @_ZTH1r = alias void ()* @__tls_init
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int &g() { return r; }
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// CHECK: define {{.*}} @[[R_INIT:.*]]()
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// CHECK: call dereferenceable({{[0-9]+}}) i32* @_Z1fv()
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// CHECK: store i32* %{{.*}}, i32** @r, align 8
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// CHECK-LABEL: define dereferenceable({{[0-9]+}}) i32* @_Z1gv()
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// CHECK: call i32* @_ZTW1r()
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// CHECK: ret i32* %{{.*}}
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// CHECK: define weak_odr hidden i32* @_ZTW1r() {
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// CHECK: call void @_ZTH1r()
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// CHECK: load i32** @r, align 8
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// CHECK: ret i32* %{{.*}}
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// CHECK-LABEL: define internal void @__tls_init()
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// CHECK: call void @[[R_INIT]]()
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