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-rw-r--r--clang/test/CodeGen/memcpy-no-nobuiltin-if-not-emitted.c25
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diff --git a/clang/test/CodeGen/memcpy-no-nobuiltin-if-not-emitted.c b/clang/test/CodeGen/memcpy-no-nobuiltin-if-not-emitted.c
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+++ b/clang/test/CodeGen/memcpy-no-nobuiltin-if-not-emitted.c
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 -triple x86_64-unknown-unknown -S -emit-llvm -o - %s | FileCheck %s
+//
+// Verifies that clang doesn't mark an inline builtin definition as `nobuiltin`
+// if the builtin isn't emittable.
+
+typedef unsigned long size_t;
+
+// always_inline is used so clang will emit this body. Otherwise, we need >=
+// -O1.
+#define AVAILABLE_EXTERNALLY extern inline __attribute__((always_inline)) \
+ __attribute__((gnu_inline))
+
+AVAILABLE_EXTERNALLY void *memcpy(void *a, const void *b, size_t c) {
+ return __builtin_memcpy(a, b, c);
+}
+
+// CHECK-LABEL: define void @foo
+void foo(void *a, const void *b, size_t c) {
+ // Clang will always _emit_ this as memcpy. LLVM turns it into @llvm.memcpy
+ // later on if optimizations are enabled.
+ // CHECK: call i8* @memcpy
+ memcpy(a, b, c);
+}
+
+// CHECK-NOT: nobuiltin
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