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
34 lines
1.0 KiB
C++
34 lines
1.0 KiB
C++
// RUN: %clang_cc1 %s -triple=x86_64-apple-darwin10 -emit-llvm -o - | FileCheck %s
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// Check that IR gen doesn't try to do an lvalue-to-rvalue conversion
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// on a volatile reference result. rdar://problem/8338198
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namespace test0 {
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struct A {
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A(const A& t);
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A& operator=(const A& t);
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volatile A& operator=(const volatile A& t) volatile;
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};
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volatile A *array;
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// CHECK-LABEL: define void @_ZN5test04testENS_1AE(
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void test(A t) {
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// CHECK: [[ARR:%.*]] = load [[A:%.*]]** @_ZN5test05arrayE, align 8
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// CHECK-NEXT: [[IDX:%.*]] = getelementptr inbounds [[A]]* [[ARR]], i64 0
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// CHECK-NEXT: [[TMP:%.*]] = call dereferenceable({{[0-9]+}}) [[A]]* @_ZNV5test01AaSERVKS0_([[A]]* [[IDX]], [[A]]* dereferenceable({{[0-9]+}}) [[T:%.*]])
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// CHECK-NEXT: ret void
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array[0] = t;
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}
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}
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namespace test1 {
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volatile int *x;
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// CHECK-LABEL: define void @_ZN5test14testEv()
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void test() {
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// CHECK: [[TMP:%.*]] = load i32** @_ZN5test11xE, align 8
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// CHECK-NEXT: ret void
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*x;
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}
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}
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